Pro-Engineer WILDFIRE

<p style="margin: 0in 0in 0pt; text-align: justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0wWFS2vkeayiMiUK1OPzWH7KnWAyjmFL45w9PlRtBR1k-X1f6gGHx1dA1TWF8FG0aHF22a7OnMMBJL5kmUuoQQT6c-dKnejndAF9OLMnCIuHex5F7bD4JlaqDF8bVCAn7l8iSIC0joik/s1600-h/clip_image001%5B37%5D.gif"><span style="font-family:Times New Roman;"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFMPD5UuRbgGD62O4_odHZ6lswyEU3odaw3eX_bAvRIpwNPwpMGAH5kKI7q0XJAJTTebF3o6fetFgN9qMxrcAXvPo3NsIhXJDH4ghhzd-iizaO2rJEzFXA9bxRYqcQf5lla8DEYNYRh_g/s1600-h/clip_image001%5B39%5D.gif"><img alt="clip_image001" border="0" height="55" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrkefAGtjePHsyPZkLtcjBVK9piCjSpmIQq6oCqtCe_rjcgQWXTJFnjdH4PRz9h1z8lQKdPdos8GMF7X20nHj7cE97fkFhkO8sSecbDTQsgRZxHecq4kgPofU3EN0v7TwuE6V644mM_kY/?imgmax=800" style="border-right: 0px; border-top: 0px; display: inline; border-left: 0px; border-bottom: 0px" title="clip_image001" width="400"></a></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Pro-Engineer adalah software pemodelan 3D dan gambar teknik 2D untuk keperluan visualisasi desain sehingga dapat digunakan dalam analisa komputasi lanjut ataupun sebagai dasar manufaktur suatu produk, dengan tambahan berbagai macam fasilitas seperti sheet metal untuk desain press part, pemodelan permukaan, analisa mekanisme, animasi dan photorender tampilan grafis dan lain-lain.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Konsep dasar modeling pada umumnya tidak jauh berbeda dengan software drawing lain, jadi apabila user memiliki interpretasi 3D model yang baik dan berpengalaman menggunakan software lain seperti autocad dapat cepat beradaptasi dengan perintah atupun operasi dalam software ini.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYFIV5vvcVtdMNZq6rUjnqOZTeqstdtxtZEtTmk3-ZiqOGCidEGuw8F-2v8Mpv5i0PL9y7zkuqdZB1OvnTHsl7njP5jwgPQ7Jw_rsGTHox5fGrnEvJSfhZUmUMUE0U7zCuskJ6N5bzLU4/s1600-h/clip_image003%5B1%5D%5B4%5D.gif"><span style="font-family:Times New Roman;"></span></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOU-XUW3cGz1UtZ-dsItO8A6Zh7y_ekAfjbyIQSxAI2F4SoabWCViPNM3Pznc5FUygD3W7Tkck6BbeLLYaoDkNzvufVGKBcoN4L7NtD5iCvIEDVSCAw2G6GjnQozsY54he5ByuDOiNTm4/s1600-h/clip_image003%5B1%5D%5B5%5D.gif"><img alt="clip_image003[1]" border="0" height="199" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsB0YApdKwF1ENp1jRKxxaNuDo00ERy38E1C1CTGYlpvAXf3OdSPfhD6ywU52B4FZ_GzZwRkZoSsfsWSzc4bq2E5siI31kBrBychsKx2SJj_oJYeygKBPecXfK92rTX3jZK5eB4duuBOY/?imgmax=800" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" title="clip_image003[1]" width="404"></a></p> <div class="fullpost"><p align="justify"><span style="font-family:Times New Roman;">Adapun sifat pemodelan dalam software ini adalah:</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><u>1. Feature-based modeling</u></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Kosep dasar pemodelan Pro-Engineer adalah “<i>Suatu model tersusun atas feature</i>”, dimana feature merupakan operasi 3D seperti extrude, revolve, hole, chamfer, round, draft, dsb. Sebagai pembuat model suatu produk yang nantinya digunakan sebagai panduan proses manufaktur atau machining, masing-masing feature penyusun model yang dihasilkan software ini harus dibuat dari suatu acuan atau datum.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><u>2. Associative</u></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Output dari software ini dikategorikan sebagai part, assembly dan file drawing, dimana perubahan didalam part akan langsung terimplementasikan dalam assembly dan drawing 2D (gambar teknik)</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><u>3. Parametric</u></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Masing-masing feature saling berhubungan satu sama lain dan dapat di-edit secara independen, perubahan dari suatu feature akan mempengaruhi feature yang lain dimana hubungan ini dikenal sebagai parent/child</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;">Untuk memudahkan pemahaman mengenai output serta hirarki file bisa dilihat pada diagram dibawah ini.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvp3inpi4rM4qGDWLFfXyEWgh9eg_EIXRoFJN2YALj1BGi7fr0dYTJZvQ3rNarBXUZbaZcnl0Zvtzu3uONQCc0rfb9TWrPAIkQZYt1utVA8fnjRpEyYhGtmQmXFkimd4TBx3DMas89dOE/s1600-h/clip_image004%5B5%5D.gif"><span style="font-family:Times New Roman;"></span></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwiA6uBquOhIp9YYPytpd2_9HBeXz0xqpvzEuFDCu0JGvOjGwJZb17-r4a19eFbcoYjv5eX5KtLJJlFcIXiRciwSusvDZldYv-LWRXHyZnhcUud2WCi05aNl2btLj7DlM1XTnYGWETzLE/s1600-h/clip_image004%5B9%5D.gif"><img alt="clip_image004" border="0" height="211" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdyyrapDSwR3RsfVp09eYYQtLXwMHuhTnv2T14KTbJSOYiatkPNx9cp_5PKMOwGntLWZd8Pe5R-nuDu-AtbjESa1JA0ImCp6dnlnaORNzAgP6xTfNY26uGYHeVqNj-pC95e440_aAlKWM/?imgmax=800" style="border-right: 0px; border-top: 0px; display: inline; border-left: 0px; border-bottom: 0px" title="clip_image004" width="404"></a></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Dari sifat-sifat diatas dapat disimpulkan untuk menghindari permasalahan dalam pemodelan 3D dibutuhkan kemampuan desainer yang cukup dalam pemahaman proses manufaktur terutama urutan proses pembuatan suatu produk, hal ini dikarenakan setiap feature yang dibuat memiliki acuan atau datum tersendiri.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Konflik operasi 3D seringkali terjadi ketika mengedit perintah atau menambahkan feature didalam suatu model yang telah dibangun, disini jam terbang dari user benar-benar teruji mengenai apa yang harus dilakukan untuk menghadapi masalah ini, apakah membuat model dari awal atau menyesuaikan parameter feature baru sehingga sesuai dengan model utama yang dibangun. </span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;">Berikut ini adalah interface atau tampilan software yang perlu dipahami oleh user sebelum melangkah dalam pemodelan.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0rcyvsUCuv53F1pZWrKQlv5dAYClP1Q2_KHKs8SYUdoH-O_7CuzkagFBRTEElIO3qYo3ibtAI1-BCRsqPf9VLguQzZEYXJ4ENW3QqphjJcjFKzBTGEGoCaO_yW8f88yFuEh0zB0lEv-M/s1600-h/clip_image006%5B4%5D.gif"><span style="font-family:Times New Roman;"></span></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCgO0193v-lh0Xwaw8ZSwinnmg8lZXC10kzIDc-EeWf19jHUIXH1ANyKGQ9bmNncyDvR64tesekISDF3ZdYuFfW4XV0mXxw-Nlt_H0594BqJpNojc695_i-3PrZ-cuSJKJm81fM03TPco/s1600-h/clip_image006%5B14%5D.gif"><img alt="clip_image006" border="0" height="265" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiyrkXHG1Vhx8ayLQcJwxGBl9jLC3nrgsTfFqOTQvLjL0WS7zDiOw3k8EbpkcWpq9q2tBD6XrX_fsOjbI8Tsi_tIO3IsLMYa8wBoUW7Ui_0mhTH7znjN8pC5UIvQlWnZRqqwTEzY98UzSM/?imgmax=800" style="border-right: 0px; border-top: 0px; display: inline; border-left: 0px; border-bottom: 0px" title="clip_image006" width="404"></a></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><em><strong>Navigation tab:</strong></em></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Di jendela ini dapat dipilih bagian apa yang ingin diproses oleh user apakah browsing file dalam komputer, daftar feature yang bisa diedit ataupun tampilan dari model dengan aktif atau non aktif-kan daftar layer yang ada.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><em>Browser control:</em></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Untuk langsung terkoneksi dengan internet dan mendpatkan informasi mengenai update, bantuan online serta produk baru dari website PTC, dapat juga untuk operasi offline seperti browsing file kerja dsb.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><em>Main Toolbar:</em></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Seperti software windows pada umumnya juga tersedia toolbar yang berisi fasilitas dasar seperti copy, paste, refresh, perintah view, dsb. serta dapat diatur tool apa saja yang ditampilkan sesuai dengan keinginan user.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><em>Feature creation toolbar:</em></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Disini akan ditampilkan perintah apa saja yang bisa dilakukan dalam modus Pro-Eng yang sedang aktif, dimana isi dari toolbar ini berbeda antara modus standard 3D dengan sheet metal ataupun mechanica.</span></p> <p style="margin: 0.1in 0in 0pt; text-align: justify"><span style="font-family:Times New Roman;"><strong><em>Dashboard:</em></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Merupakan parameter apa saja yang perlu dimasukkan oleh user untuk membentuk feature yang dikehendaki.</span></p> <p style="margin: 0.1in 0in 0pt; text-indent: 0.5in; text-align: justify"><span style="font-family:Times New Roman;">Sebagaimana kita ketahui sebelumnya bahwa selain sebagai software modeling juga dilengkapi dengan beberapa fasilitas ataupun kemampuan analisa lain dalam Pro-Engineer versi Wildfire seperti mechanica (<a href="http://fajaryannu.blogspot.com/2009/06/static-vs-dynamic-finite-element_21.html">Static FEA</a>), sheet metal design, mechanism akan dibahas pada posting berikutnya.</span></p> <p><span style="font-family:Times New Roman;"></span></p></div>

Pro-Engineer WILDFIRE

Pro-Engineer adalah software pemodelan 3D dan gambar teknik 2D untuk keperluan visualisasi desain sehingga dapat digunakan dalam analisa k...

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Static Vs Dynamic Finite Element Analysis

<p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">A simulation called dynamic when some of parameter are variably in line with time alteration or can be said time based simulation. For example box positions in <a href="http://fajaryannu.blogspot.com/2009/06/dynamic-system-simulation.html">dynamic motion simulation</a> post, are categorized as time based simulation because its change collateral with time increases. If your simulation are contains displacement, velocity, acceleration or any variable that depend on time so it’s your dynamic simulation.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">How about Finite Element Analysis, what kind of FEA simulation are categories as dynamic? For example in Stress simulations post, are categorized as static FEA since no time based variable are involve, how about the video that obviously shows stress vary with time? No, its only animation with using load factor and there are no stress output data generated by Msc.Visual Nastran 4D that depend of time. The main distinction parameters to grouping our analysis in static or dynamic field are equivalent stress with von misses theory (<span style="font-family:Symbol;">s</span>_vm</span><span style="font-family:Times New Roman;">):</span></p> <div class="fullpost"> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdK4vTidvMSNOQzdZ1HFyBX0V5QpOEreR41XfcKf4csOBPBSpJ8xASPW-Y03Ia7IldPaCI1MhQbUGYeXGmt-jUdIDkvUGKNV02zPPmvY9CqAiA1fwjx7LmzHMMKgU6xyfIc6GQFA-puBs/s1600-h/clip_image004%5B8%5D.gif"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;" ><img alt="clip_image004" border="0" fix="fixed" height="45" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgg2H-kMEOgPSr8_pLYUzeBbN0XDZvcm9LyPGV5d8l0TiXicbP0RMHz2hMUlRMk5rpFdJM32M2uPJpS6hhbqZ7foZzZNMRPcaTtRyNJt5v7uachlM-UslfjPqZYyGHyOpMKnzNMQiznSug/?imgmax=800" style="border-width: 0px; display: inline;" title="clip_image004" width="372" /></span></a></p> <p align="justify"><i><u><span style="font-family:Times New Roman;">Remark:</span></u></i></p> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8O7SlV5353S1J0FJ0dZz1LTfIBr5RouheHdAGaf01x6n_iqxopowfRnCTVKp90PwTgTISvT-WD9VFLXDy8QC_qPJuhDNIrp6t1xB6k0khg49FvAYg16AJ_yMDTDMM1xSVMWngQ0D5CpI/?imgmax=800"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;" ><img alt="clip_image006" border="0" fix="fixed" height="72" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPsZLROWBAzcDxYMrLP15ZJ3IqtrgWsp1Nmh0WsIOzAIF8zkm2uNe2m_aJQQEqKSwm50v9T3tpt7kF_1v9uMxx9PutzNN8Wqyw06YPxGa8EZRorWzUWQlZFi7GvHCylKbiw4z4hGWuzCk/?imgmax=800" style="border-width: 0px; display: inline;" title="clip_image006" width="175" /></span></a></p> <p align="justify"><span style="font-family:Times New Roman;">To gain comprehension and knows the different more clearly to identify a Finite Element Analysis category, I will explain each below:</span></p> <p align="center"><b><i><u><span style="font-family:Times New Roman;">STATIC FEA</span></u></i></b></p> <p align="justify"><b><u><span style="font-family:Times New Roman;"></span></u></b></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">Finite Element Analysis described as static if meet the condition where yield strength of material are greater than generated stress (</span><span style="font-family:Symbol;">s</span>_vm≤<span style="font-family:Symbol;">s</span>_yield<span style="font-family:Times New Roman;">), as an effect for exposing external load in object or model. So if we said our visual display consist of frame by frame in proportion with time, any deformation or shape transformation as calculation result that performed previous frame are neglected in the next frame so our model assume recover instantly or never been receive any load before, this assumption are applied because stress works in elastic area of material or usually known as small deformation analysis.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">This static FEA regularly used to verify whether current design meet infinite life time work condition or not ,of course combining the stress calculation result with theory of failure that include safety factor in it.</span></p> <p align="center"><b><i><u><span style="font-family:Times New Roman;">DYNAMIC FEA</span></u></i></b></p> <p align="justify"><b><i><u><span style="font-family:Times New Roman;"></span></u></i></b></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">In contrary, if generated stresses from external load are passing yield strength so your simulations are categorized as dynamic FEA (</span><span style="font-family:Symbol;">s</span>_vm><span style="font-family:Symbol;">s</span>_yield<span style="font-family:Times New Roman;">). Deformation or change shape in analyzed model because of exposed load aren’t neglected so continuously effect especially shape transformation are considerate as calculation variable for next frame depend on time range that decided by user, its known also as Large deformation analysis</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">These methods are useful to see behavior of our model when work in over load condition, such as collision analysis, crack propagation and etc.</span></p> <p align="justify"><span style="font-family:Times New Roman;">In picture below I made some example a loaded bar tip and hold fix in the other end with frame by frame overview</span></p> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivX-90MtU7sq6Tt2Od_ZuPksjCGdkWV4CxPrJ-OYwTmApRzvy-9f0HFCAwi0EPja3ZhrTPI9TGA4sYpSSo3xcwZEpZf4YDqnU_jMd33Oc6_bMTB7vqtnS7HDIVFD3gx2wubkrSvdAdbiQ/s1600-h/clip_image012%5B7%5D.jpg"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;" ><img alt="clip_image012" border="0" fix="fixed" height="144" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2hp1WXyKXpRAhTUVoOJeO_5diEVvH4XUsKt2FR9at096dzhNfr6ik25cXFyezLDud4cZdXrpDoTw87q7UOgavvBom0urjb8DtLVKrnKtvPUem9xdqZ4PU-dgeuXAgOMqRdL4p5I-tw54/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image012" width="373" /></span></a></p> <p align="justify"><span style="font-family:Times New Roman;">To decide whether our FEA are static or dynamic can be easily recognize by using Stress-Strain Diagram, in which area they perform analysis</span></p> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqrvYijhNrzA0cikKLe6o6jykwasVzDVvIFcZiw1h7f0C_cpx-cR3x3Imj7wLO1mnkpzNVtXH4VRmbXwgKKnVYACOCGLvmlMPxUDfo7UOhvPt9WJWo5Ae2HLZ1eC3ryF4AGWkrsH7pXaU/s1600-h/clip_image014%5B5%5D.jpg"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;" ><img alt="clip_image014" border="0" fix="fixed" height="304" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrt0Gvnd7yYKf1Q1ezEltgh3uESCN6EtwSb75_iksWJRNGKiusK-u8v6GxQJRu8uAaRfotnHC_3_XKnHZtna9JozwwBN3cBLstvpVYF7vV8U83D7-2HU4tcQvwU7LSIyj5dQEkotJWA-E/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image014" width="297" /></span></a></p> <p align="justify"><span style="font-family:Times New Roman;">In some mechanical engineer literature, "Static FEA" also mention as "Linear Static FEA" since linear slope in elastic area base on above diagram.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">In Vn4D we can collaborated both Motion and Finite Element Analysis in a single simulation environment of course with condition that calculated FEA have to meet linear static FEA requirement, if doesn’t, it will shows error message that says the calculated result doesn’t pass the validation test.</span></p> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHjg2adRBvdXSmyscI25feq90LEvNHgEN1dzDrMct8oY-2RQ0v3lecvns4KbRnv-4mUwgun1JQKVTpG1LlW1z7Lx25Frgzqat4XplCDpc33lISX9bNho_yEpGmTQl9nzMLK_0GrDbbtI4/s1600-h/clip_image015%5B6%5D.jpg"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;" ><img alt="clip_image015" border="0" fix="fixed" height="94" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9rl7-ZcX2nlcJzfKjClVV4y7Vw0s9KRLbo307Srk3VN3KB_1LZrfg5hjBjKO9XNzekUXyLFLcu1cH-aXy-eMVU_iiZiXh0a6SL6tpzjKcGErw_V6YzAbgyNLJWnMfBYPP6FWnaq34Hpk/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image015" width="376" /></span></a></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;">Now we know that Finite Element Analysis also divides in two categories, If linear static FEA can be handled by Msc.Visual Nastran 4D (Vn4D) so how about dynamic FEA? I will explain how to perform Dynamic FEA with software ANSYS-LS DYNA in other post.</span></p> <p><span style="font-family:Times New Roman;"></span></p></div>

Static Vs Dynamic Finite Element Analysis

A simulation called dynamic when some of parameter are variably in line with time alteration or can be said time based simulation. For examp...

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Stress Simulation

<p style="font-family:times new roman;"><span style="font-size:100%;"></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;font-family:times new roman;"><span style="font-size:100%;">This page will explain what kind of Stress simulation with Finite Element Analysis (FEA) in Msc.Visual Nastran 4D (Vn4D). The main idea in FEA are simplifying continues model become discrete that build by element and node, so simple isn’t it??</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;font-family:times new roman;"><span style="font-size:100%;">Converting continues 3D model to become discrete element are determine accuracy of the result that will be generated, so user experience and knowledge in FEA will be the main issue, big element size resulting coarse result but small element size will resulting unnecessary effort that affect in increasing computational time and hardware work load so focus on our analysis goal are the golden mean, feature in Vn4D called “Control Mesh” are the answer, where we can smoothing element size in local places which are become our analysis objective.</span></p> <div class="fullpost" style="font-family:times new roman;"> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;font-family:times new roman;"><span style="font-size:100%;">First we have to know what an element that generated by our software, not like CAM Software that are specializing in Finite Element Analysis such as ANSYS, there are no other option for deciding what kind of an element that use in FEA, Vn4D only using “<u>Ten-Node Quadratic Tetrahedron</u>” about advantage or disadvantage and why this type of element are choose by Vn4D will be discus in different post, but keep in mind that I‘m not going to guide you step by step how to perform stress simulation using Vn4D just what we get and how to achieve better result with feature in this software.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-size:100%;">For an example I will use two different model that expose by equal force in different direction at both end, they are notched bar and hole plate which is already transform in element and node:</span></p> <p align="justify"><span style="font-size:100%;">1. <u>Coarse model with constant overall element size</u></span></p> <p align="justify"><span style="font-size:100%;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpSavighnJ1g7F58Ctod_LDw7VNfUUU1LWl4Al05U9mZ5laCG71Cgma2KhtkiodofG_FpgFXzpd0OFAdBu-Ot-AmkCmykY2G-YDLhN-oFHy_D_7KixiqfU6L2NiR9g9NV1o3t-86o_CQ8/s1600-h/clip_image001411.jpg"><img alt="clip_image001[4]" border="0" fix="fixed" height="195" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcu0Gog_yhkdD4_hD5-a3l1EMMhitz9NpfNRnIub75fmabPi_NpZcZWaO5ZabW-nLCayjtJSQLf_sqpcaaRwRA42DJyW_SDag9dE0_4Ob1K8pUqKfCZuqXXPIR_wlqcVgpaypUvTRoVZ4/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image001[4]" width="244" /></a></span></p> <p align="justify"><span style="font-size:100%;">As you see in the picture above, our 3D model become coarse especially rounded shape</span></p> <p align="justify"><span style="font-size:100%;">2. <u>Smoothing model with application “Control Mesh” in area that identify exposed by large stress concentration</u></span> </p> <p align="justify"><span style="font-size:100%;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfefbdXLz9mitKzS092f8gjjkmOdWAG4B2cgC76JRj4qRyt3a7HqstV_ED_RSfO1eQ9oNfIDkZx0OyztdPUbZLe-Sk4bRhhj3aDpzEXMdFlR4UVFfiV_WlNB4Zjt2EQFvggS4hX82LvII/s1600-h/clip_image00242.jpg"><img alt="clip_image002[4]" border="0" fix="fixed" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeUZc2UBjB5m9nerX5eoUNNiGEsDecr_Nj0twYQXJ0-zd1uC4vLmRfPJH0yx4uZ1xxaVIVoLUA_equCZ7GeZ29C6Sm18mI3x2RYLVFShdz2N5aRZct_CBEV6U1F9KBX3U8dBWppsQZp2k/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image002[4]" width="244" /></a></span></p> <p align="justify"><span style="font-size:100%;">Improvement in the critical shape area will reduce generated max error</span></p> <p align="justify"><span style="font-size:100%;">3. <u>Smoothing model with reducing overall element size a half from model no.1</u></span></p> <p align="justify"><span style="font-size:100%;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsKtHpWjqMTPmvummbOFTPX8nJVtOI6LKvCHaL4nxt1g_9h8h2cgDRJab6xUJ1oz2_1XwNV4f5fh-asOigmvzZKUg3yki8pAe4wb9nHvBhyphenhyphendf9E3YRyy1bGZQpiz5iGtvKjFlhmII0HSg/s1600-h/clip_image00442.jpg"><img alt="clip_image004[4]" border="0" fix="fixed" height="197" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNifHWO4BXq6G1aH4aTZ962O6KDYskmP9lxcyHoqqLcG1gxaWXnzOto2ZutkSRQOnG1T2t1jndua4nfT_eqFCmPIaJEyDU1woGd52oKHyiTxLS_NamHSxqwSLYsFYJiIpZj2u3DPTMmQc/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image004[4]" width="244" /></a></span></p> <p align="justify"><span style="font-size:100%;">Smoothing element size by a half contribute slightly reducing max error, continuing by reduce element size will perform better result but in contrary will increase number of element and node.</span></p> <p align="justify"><span style="font-size:100%;">For better overview about an effect of mesh size can be seen in table below:</span></p> <table border="1" cellpadding="2" cellspacing="0" width="400"><tbody><tr><td valign="top" width="108"><span style="font-size:100%;"><strong><em>Model Shape</em></strong></span></td><td valign="top" width="136"> <p align="center"><span style="font-size:100%;"><strong>Notched bar</strong></span></p> </td><td valign="top" width="141"> <p align="center"><span style="font-size:100%;"><strong>Hole plate</strong></span></p> </td></tr></tbody></table> <table border="1" cellpadding="2" cellspacing="0" width="400"><tbody><tr><td valign="top" width="126"><span style="font-size:100%;"><em><strong>Sample No</strong></em></span></td><td valign="top" width="40"> <p align="center"><span style="font-size:100%;">Model 1</span></p> </td><td valign="top" width="49"> <p align="center"><span style="font-size:100%;">Model 2</span></p> </td><td valign="top" width="44"> <p align="center"><span style="font-size:100%;">Model 3</span></p> </td><td valign="top" width="45"> <p align="center"><span style="font-size:100%;">Model 1</span></p> </td><td valign="top" width="53"> <p align="center"><span style="font-size:100%;">Model 2</span></p> </td><td valign="top" width="42"> <p align="center"><span style="font-size:100%;">Model 3</span></p> </td></tr><tr><td valign="top" width="126"> <p><span style="font-size:100%;"><strong>Mesh size</strong></span></p> </td><td valign="top" width="40"> <p align="center"><span style="font-size:100%;">10 mm</span></p> </td><td valign="top" width="49"> <p align="center"><span style="font-size:100%;">10 mm</span></p> </td><td valign="top" width="44"> <p align="center"><span style="font-size:100%;">5 mm</span></p> </td><td valign="top" width="45"> <p align="center"><span style="font-size:100%;">10 mm</span></p> </td><td valign="top" width="53"> <p align="center"><span style="font-size:100%;">10 mm</span></p> </td><td valign="top" width="42"> <p align="center"><span style="font-size:100%;">5 mm</span></p> </td></tr><tr><td valign="top" width="126"> <p><span style="font-size:100%;"><strong>Control mesh size</strong></span></p> </td><td valign="top" width="40"> <p align="center"><span style="font-size:100%;">-</span></p> </td><td valign="top" width="49"> <p align="center"><span style="font-size:100%;">2 mm</span></p> </td><td valign="top" width="44"> <p align="center"><span style="font-size:100%;">-</span></p> </td><td valign="top" width="45"> <p align="center"><span style="font-size:100%;">-</span></p> </td><td valign="top" width="53"> <p align="center"><span style="font-size:100%;">2 mm</span></p> </td><td valign="top" width="42"> <p align="center"><span style="font-size:100%;">-</span></p> </td></tr><tr><td valign="top" width="126"> <p><span style="font-size:100%;"><strong>Node</strong></span></p> </td><td valign="top" width="40"> <p align="center"><span style="font-size:100%;">581</span></p> </td><td valign="top" width="49"> <p align="center"><span style="font-size:100%;">1555</span></p> </td><td valign="top" width="44"> <p align="center"><span style="font-size:100%;">2818</span></p> </td><td valign="top" width="45"> <p align="center"><span style="font-size:100%;">1051</span></p> </td><td valign="top" width="53"> <p align="center"><span style="font-size:100%;">4979</span></p> </td><td valign="top" width="42"> <p align="center"><span style="font-size:100%;">5828</span></p> </td></tr><tr><td valign="top" width="126"> <p><span style="font-size:100%;"><strong>Element</strong></span></p> </td><td valign="top" width="40"> <p align="center"><span style="font-size:100%;">276</span></p> </td><td valign="top" width="49"> <p align="center"><span style="font-size:100%;">835</span></p> </td><td valign="top" width="44"> <p align="center"><span style="font-size:100%;">1538</span></p> </td><td valign="top" width="45"> <p align="center"><span style="font-size:100%;">495</span></p> </td><td valign="top" width="53"> <p align="center"><span style="font-size:100%;">2803</span></p> </td><td valign="top" width="42"> <p align="center"><span style="font-size:100%;">3229</span></p> </td></tr><tr><td valign="top" width="126"> <p><span style="font-size:100%;"><strong>Max error</strong></span></p> </td><td valign="top" width="40"> <p align="center"><span style="font-size:100%;">12.2%</span></p> </td><td valign="top" width="49"> <p align="center"><span style="font-size:100%;">6.74%</span></p> </td><td valign="top" width="44"> <p align="center"><span style="font-size:100%;">8.9%</span></p> </td><td valign="top" width="45"> <p align="center"><span style="font-size:100%;">7.2%</span></p> </td><td valign="top" width="53"> <p align="center"><span style="font-size:100%;">1.3%</span></p> </td><td valign="top" width="42"> <p align="center"><span style="font-size:100%;">3.3%</span></p> </td></tr></tbody></table> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"> </p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-size:100%;"><br /></span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-size:100%;">From table above we know that using “Control Mesh” feature will give significant error reduction with additional node and element that still tolerable to achieve analysis goals, but if your supported hardware are able to perform large computational process maybe I suggest to reduce overall element size since smaller element size means getting toward to continues model as our original object for stress simulation, so back again its up to you what kind of constraint do you have?</span></p><span style="font-size:100%;"><object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/KDpKwQYfZPc&hl=en&fs=1"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always"><embed src="http://www.youtube.com/v/KDpKwQYfZPc&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object></span></div>

Stress Simulation

This page will explain what kind of Stress simulation with Finite Element Analysis (FEA) in Msc.Visual Nastran 4D (Vn4D). The main idea in...

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Basic Simulation

<p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:Times New Roman;font-size:100%;">Main idea of simulation are bringing phenomenon in the real life condition to numerical approach which is applying ideal condition with visual display or just numeric calculation. As the methods are approximation so there are some error that produced but with an experience and supported by correct device, we can minimize an error itself so practice are the best teacher.</span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;font-size:100%;">With explanation above can be assumed that we are playing with prediction here, whether its giving good result or totally fail depend on how much our knowledge about the project. I'm going to share what I know to give you simple guidance especially for newbie how to perform a simulation, for better understanding please read first posting about Dynamic System Simulation because I’ll made some correlation example in that post.</span></p><span class="fullpost" style="font-size:100%;"><br /><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">Whats needed to perform a simulation, all example are related with <a href="http://fajaryannu.blogspot.com/2009/06/dynamic-system-simulation.html">Dynamic System Simulation</a> post:</span></p> <p align="justify"><span style=";font-family:Times New Roman;">1. <strong><u>Goals</u></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">Before doing anything lets set our goal first, so we can see our path and what tools are needed</span></p> <p style="margin: 0in 0in 0pt;"><span style=";font-family:Times New Roman;">Example: Make some mechanism that transfer an object following a path in continues cycle</span></p> <p align="justify"><span style=";font-family:Times New Roman;">2. <u><strong>Tools</strong></u></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">What device or tools that will be correct to supporting our project, hardware or even software as we know there are many of both which is build with special purpose, from this we can measure the complexity level of our simulation.</span></p> <p align="justify"><span style=";font-family:Times New Roman;">3. <strong><u>Model</u></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">Now prepare the model, create as simple as you can but still keeping our goal for this simulation if involved models are complex divide it in to groups that have certain function, this is for preventing missing component when setting up complex model because some simulation software doesn't have 3D builder feature even available its just additional with minimal feature so for complex model can achieve by exporting from CAD software, now the questions "Are simulation software has a feature to update models from CAD software?" if you use Vn4D there are a feature that support this by using "Tools - Update from CAD" </span></p> <p style="margin: 0in 0in 0pt;"><span style=";font-family:Times New Roman;">Example: My models are divide in to three category base on its function Dropper, Convey, Lifter which is consist of bodies or other sub-categories.</span></p> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPoXTXcvwgeJWyyFJ409tnWmRdgftjokCJfJwvKH9SDorm99AXgeJ06DcWWQrPaO-zHqxN_x7cvaQgwRznVE4WlZjb65e6kSu40fQUNxdCt9iHvDou4jeb_2J9IOsudu6Xms9_0cCc350/s1600-h/clip_image002%5B24%5D.jpg"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;"><img alt="clip_image002" border="0" fix="fixed" height="163" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWlEGmnQyg7riMobxT407ujQ2qFNG51ubtYoVLwlT1_N1w9MOtPPmLpKX64Chh8IXlJ4Zs-FnrVo7OyyTOEkIJ_YYczGiRawH20W8VkEPdBsqh4liATjc7J0FCBXVOqO8OGxqRX414tHM/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image002" width="403" /></span></a></p> <p align="justify"><span style="font-family:Times New Roman;">4. <u><strong>Boundaries</strong></u></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">This stage require user skills to transfer their knowledge become virtual environment in simulation software, what kind of limitation of our bodies so if they are combined become a mechanism that represent our goals, visual display parameter and inputting mechanical parameter become part of this also.</span></p> <p align="justify"><span style="font-family:Times New Roman;">5. <u><strong>Setting analysis</strong></u></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">After adjusting virtual environment, then advance to setting up kind of analysis that become our output, we can choose in Vn4D whether dynamic, Finite Element Analysis (FEA) or both combined. Don't forget to choose correct numerical approach in order to minimize an error become very important item.</span></p> <p align="justify"><span style=";font-family:Times New Roman;">6. <strong><u>Reading result</u></strong></span></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">The last one is reading result, since there are many computational data that produce by our software whether readable or not, simplify it by taking or monitoring necessary data only to reduce processing time but still have direction in achieving purpose of our simulation, the important thing don't forget to verify an error that produced, it's determine whether our simulation can be answerable with appropriate result or just playing around with coarse result, if your data result still giving large an error, you can go back to check what missing item in each stage, try to avoid this because you have to work twice so like I said before experience, knowledge and carefulness from user are the main important thing.</span></p> <p align="justify"><span style=";font-family:Times New Roman;">To make it simple read this flowchart</span></p> <p align="justify"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoaT2osjp-eBGZsQYVhiiKulNw83nxPjpQXtfzi0hH9moSwI1p7e8Buvk4e9a6N6T6iNsI6wjmcHbJM5nayHQMnZiH_jaq3uDz-bZrzApCF7XEpQJ-rmct-I3NyEd8PCtJSTc1q1R5Ei0/s1600-h/clip_image004%5B5%5D.jpg"><span style="color: rgb(51, 51, 51);font-family:Times New Roman;"><img alt="clip_image004" border="0" fix="fixed" height="204" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_hOFu0_NSkrhoQ7AcoqW_vWv-MrrDX6t55o_jVRSA0E2pV_jVlwqFacwo3x_P2AYKKR_sxy9zjB5x5aijvi-kCMzzWgG4NG015W-HAGVR-KVFK2VmXy1L7ttI5p-i7CFqtKgN2oBEuNs/?imgmax=800" style="border-width: 0px; display: block; float: none; margin-left: auto; margin-right: auto;" title="clip_image004" width="404" /></span></a></p> <p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style=";font-family:Times New Roman;">Simulation are very become important stage before applying new design invention since trial and error become old fashion method with high cost for prototyping, so if we can do half in virtual environment, why not???</span></p><br /></span>

Basic Simulation

Main idea of simulation are bringing phenomenon in the real life condition to numerical approach which is applying ideal condition with visu...

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Dynamic Motion Simulation

<p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;">By continuing my first posting about introduction Vn4D in Indonesian language, now I'll make some simple application for this software to perform dynamic simulation, this is an example for multi-body simulation and I made in a bit complex system but with simplealgorithm. I'm only explaining the algorithm not the syntax so you can apply with other software.</span><br /></p><span style="font-family:times new roman;"></span><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;">Let's get straight to the point, first of all before starting simulation we need a model, see picture below:</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span></p><p style="margin: 0in 0in 0pt; text-align: justify;"><img alt="" border="0" fix="fixed" id="BLOGGER_PHOTO_ID_5344526318412486706" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOd_lCtVguAu7UkMdQx16cHLD9g_3xjgeTomvh9J3r6BuX6Aox6BdJTTpCG0KTOpgxYU9cpTXwDsrn8IrhKdTQp8K1zM_jY3ZH7sp1sTrgXqtAJ9seJ-Oq0H6y4qGfGZB18hvi2F7xYXc/s400/Model.JPG" style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 400px; height: 219px;" /></p><div class="fullpost"><p style="margin: 0in 0in 0pt; text-align: justify;"><span style="font-family:times new roman;">I divide in to three part mechanism:</span></p><p style="margin: 0in 0in 0pt; text-align: justify;"><span style="font-family:times new roman;">1. </span><strong><span style="font-family:times new roman;">Dropper</span></strong><span style="font-family:times new roman;"> : This mechanism transferring box from top to bottom conveyor, </span><span style="font-family:times new roman;">consist of spade and sphere as weighter</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">2. </span><strong><span style="font-family:times new roman;">Convey </span></strong><span style="font-family:times new roman;"> : Moving object in horizontal direction or transferring box from </span><span style="font-family:times new roman;">dropper to lifter and contrary</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">3. </span><strong><span style="font-family:times new roman;">Lifter </span></strong><span style="font-family:times new roman;"> : More complex mechanism that transferring box from bottom to </span><span style="font-family:times new roman;">top conveyor, divide again in two component (mover and riser) </span><span style="font-family:times new roman;">with detailed each in the picture above.</span></p><p style="margin: 0in 0in 0pt; text-align: justify;"><span style="font-family:times new roman;"></span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;"></span></p><p><span style="font-family:times new roman;">Next step are planning how our mechanism work, see diagram below for overview.</span></p><p><img alt="" border="0" fix="fixed" id="BLOGGER_PHOTO_ID_5344526677390494402" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwRQ8NwYIfZhZf8p8pbT9W7i5gRrohhrpGBXbls5YmgqphFMJhxcfcvDScFEhp1sLh6v_PFDY2mP5ajxhtpqStjWPQzHUv4oI0_rGJidj6BfJpPL06kLmn9qkVdB0tmwiZM9hJnnK7dpE/s400/Diagram.JPG" style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 400px; height: 134px;" /></p><p><span class="fullpost"></span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;">How to make our simulation run with following diagram above, I'll make it simple by using question-answer method for better understanding.</span></p><p><span class="fullpost"><span style="font-family:times new roman;"></span></span></p><p><span style="font-size:100%;"><span style="font-family:times new roman;"><strong>Q: How to make the box move via bottom conveyor to the lifter?</strong></span></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: Set conveyor surface velocity to "n" mm/s and don't forget to set collide behavior between box and conveyor, remember to set collide on a pair of body that really means to be touching each other in simulation</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><strong>Q: What triggering lifter starts to work?</strong></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: lifter work when the box fully leaving conveyor, first we have to know weight of conveyor and box independently then read constraint force if only measure weight of conveyor its mean box already leaving the conveyor surface and combine with other parameter to indicate when lifter work for lifting or reset to its original position, such as readable constraint force at the top conveyor</span><span style="font-family:times new roman;">.</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><strong>Q: I see the mini lifter and the raiser move at the same time with different slot distance, how to make this happen?</strong></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: it’s just simple, we know the distance now the speed for each found by comparing V1/d1=V2/d2, since they travel at the same time, you'll find V1 and V2 value.</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span><strong><span style="font-family:times new roman;">Q: How </span><span style="font-family:times new roman;">does the </span><span style="font-family:times new roman;">actuator works?</span></strong><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: Of course readable parameter of distance become indicator, no matter mini lifter or raiser as the reading object they reach the top at the same time, then actuator will pushing pad until fully stroke</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span><strong><span style="font-family:times new roman;">Q: How </span><span style="font-family:times new roman;">does the </span><span style="font-family:times new roman;">motor works?</span></strong><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: Motor work when actuator are fully stretched, then rotate with certain angular velocity until desired angle position achieve and back to reset position when constraint force of top conveyor read sum of weight box and conveyor itself.</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><strong>Q: Are setting parameter for top conveyor same with bottom conveyor?</strong></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: Yes it does, just velocity direction need to set an opposite.</span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;"><strong>Q: How to make Dropper work by using its natural movement?</strong></span><span style="font-family:times new roman;"><br /></span><span style="font-family:times new roman;">A: Now this is need a calculation out side from software since there aren't control except limiting hinge movement by degree, first we have to now length of arm between hinge with sphere (l1), weight of sphere (F1) then length of arm from hinge to spade center gravity (l2) and spade weight (F2), of course weight of box (Wb) as known variable, then make sure current condition are meet with this equation F1*L1<(F2+Wb)*L2, if doesn't you can edit sphere weight without changing dimension shape.</span></p><p><span style="font-family:times new roman;">Clips below are generated output from Vn4D, I also give a graph to monitor what torque motor that needed to lift the raiser component with constant velocity<br /></span></p><p align="center"><span style="font-family:times new roman;"></span><object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/uJJfCzKbKjA&hl=en&fs=1&rel=0"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always"><embed src="http://www.youtube.com/v/uJJfCzKbKjA&hl=en&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;"></span></p><p><span class="fullpost"></span></p><p><span class="fullpost"><span style="font-family:times new roman;"></span></span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;"></span></p><p><span class="fullpost"></span></p><p><span class="fullpost"><span style="font-family:times new roman;"></span></span></p><p><span class="fullpost"></span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;"></span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;">That's the algorithm for our mechanism, simple isn't it??? Now try it with your own imagination, what else this model can do....you decide it.</span></p><p style="margin: 0in 0in 0pt; text-indent: 0.5in; text-align: justify;"><span style="font-family:times new roman;">In this dynamic simulation you can do half of your work and cut much of time before advance to prototyping stage, with wide range of application in laboratories for an experiment or in industry by designing some manufacture assembly process even robotic movement which is applying automatic controller, of course with considering mechanical principles</span></p></div>

Dynamic Motion Simulation

By continuing my first posting about introduction Vn4D in Indonesian language, now I'll make some simple application for this software t...

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