http://www.FEA-Forums.com/ FEA Forums: Last 35 Posts en Tue, 06 Jan 2009 10:11:43 +0000 http://www.FEA-Forums.com/topic/68#post-90 Wed, 24 Dec 2008 04:46:44 +0000 jvdb 90@http://www.FEA-Forums.com/ <p>Dear all</p> <p>I am a newbie to the field of FEA, so I apologize if the answers to my questions are rather obvious. I am working with Comsol 3.3a. I would like to solve a structural problem on a volume mesh (tetrahedrals). I have created a mesh in Matlab and I am using the Comsol scripting language in the Matlab environment. Subsequently, I export the femmesh structure to Comsol. Yet, does anyone has an idea of how to attribute certain subdomains on self-created meshes with scripting? At this moment, I only have a femmesh.</p> <p>Code (with node and elem the tetrahedral coordinates and elements): </p> <p>el = cell(1,0);<br /> el{1} = struct('type','tet','elem',elem');<br /> m = femmesh(node',el);<br /> m = meshenrich(m);<br /> fem.mesh=m;</p> <p>Furthermore, when looking at this mesh in Comsol, it looks exactly the same as the one in Matlab, yet the boundaries (faces) do not equal, i.e. they are less detailed.</p> <p>Thanks</p> <p>Jan. </p> http://www.FEA-Forums.com/topic/67#post-89 Tue, 16 Dec 2008 02:45:12 +0000 grakesh2 89@http://www.FEA-Forums.com/ <p>Hey friends please help me </p> <p>to find out tutorials for MSC-Nastran</p> <p>Thanks &#38; Regards<br /> Rakesh </p> http://www.FEA-Forums.com/topic/66#post-88 Tue, 09 Dec 2008 21:22:58 +0000 bhaleraosatish 88@http://www.FEA-Forums.com/ <p>Anybody is having ansys soft copy book where all the tutorial are explained.<br /> please send me on <a href="mailto:satish.b.bhalerao@in.abb.com">satish.b.bhalerao@in.abb.com</a> </p> http://www.FEA-Forums.com/topic/65#post-87 Mon, 01 Dec 2008 09:55:58 +0000 jake08 87@http://www.FEA-Forums.com/ <p>Hi is there anyway to add unexisting degrees of freedom to an element in ansys? I am using a link element (link8) which has translational degrees of freedom in x y an z directions but would like to extend it to have rotational degree of freedom about the z axis. Can someone please help. </p> http://www.FEA-Forums.com/topic/61#post-86 Fri, 21 Nov 2008 06:10:37 +0000 amae36 86@http://www.FEA-Forums.com/ <p>Hi<br /> Recntly i start some researches about rotor dynamics in ansys i experenced some analysis in msc nastran&#38;patran &#38; cosmos, but i found that ansys has good options for rotor dyanamics, i have some tuterials about that (ansys tuterials):<br /> NonLinear Analysis of a Cantilever Beam<br /> Dynamical_Modal analysis<br /> Harmonic Analysis of a Cantilever Beam<br /> Transient Analysis of a Cantilever Beam<br /> ask your question maybe i can help you or email me if you want to read that tuterials yourself<br /> <a href="mailto:amae36@gmail.com">amae36@gmail.com</a><br /> <a href="http://mechanicalmates.persianblog.ir" rel="nofollow">http://mechanicalmates.persianblog.ir</a> </p> http://www.FEA-Forums.com/topic/64#post-85 Wed, 19 Nov 2008 23:23:00 +0000 keyur02 85@http://www.FEA-Forums.com/ <p>hello friends i have ansys workbench 11<br /> while i am doing meshing in simulation i got the error,</p> <p>Error: A COM interface error occurred while communicating with the MESHER module. </p> <p>please help me out to solve this ERROR............</p> <p>thnx in advance....!!! </p> http://www.FEA-Forums.com/topic/63#post-84 Mon, 10 Nov 2008 06:25:04 +0000 rammmy 84@http://www.FEA-Forums.com/ <p>Dear friends,</p> <p>I modeled a 3-d block ,after that I glue it with another block on the top surface the I defined the upper layer with solid226(piezoelectric element).<br /> as you know with applying force on piezoelectric layer we can see the generated voltage , but this show electrical voltage on all of the piezo nodes . and this is very huge of data.<br /> because of that I want to define some electrode on the piezo layer to see the sum voltage on any defined electord part ( as shown in ANSYS tutorial with the title of Sample piezoelectric Analysis )</p> <p>bu I don't know how to do it in 3D model!!!! </p> http://www.FEA-Forums.com/topic/62#post-83 Mon, 10 Nov 2008 06:22:17 +0000 rammmy 83@http://www.FEA-Forums.com/ <p>Dear friends,</p> <p>I modeled a 3-d block ,after that I glue it with another block on the top surface the I defined the upper layer with solid226(piezoelectric element).<br /> as you know with applying force on piezoelectric layer we can see the generated voltage , but this show electrical voltage on all of the piezo nodes . and this is very huge of data.<br /> because of that I want to define some electrode on the piezo layer to see the sum voltage on any defined electord part ( as shown in ANSYS tutorial with the title of Sample piezoelectric Analysis )</p> <p>bu I don't know how to do it in 3D model!!!! </p> http://www.FEA-Forums.com/topic/61#post-82 Fri, 07 Nov 2008 04:20:25 +0000 madhavsai190 82@http://www.FEA-Forums.com/ <p>Hi friends</p> <p>This is madhav, anybody know about "the ROTORDYNAMICS in ANSYS 11.0" please help me.</p> <p>Regards<br /> Madhav </p> http://www.FEA-Forums.com/topic/60#post-81 Mon, 06 Oct 2008 14:25:32 +0000 Latvian 81@http://www.FEA-Forums.com/ <p>If anyone is familiar with this software, could you please tell me how to model a beam in elevation?</p> <p>Best regards. </p> http://www.FEA-Forums.com/topic/59#post-80 Fri, 03 Oct 2008 04:15:30 +0000 vadimsgeza 80@http://www.FEA-Forums.com/ <p>Hi!</p> <p>I would use two different element types with same elements, for this You need both parts to be different areas.<br /> if You use beam1 elements:<br /> et,1,beam1...<br /> et,2,beam1...<br /> and corresponding materials:<br /> mp,1,...<br /> mp,2,... </p> http://www.FEA-Forums.com/topic/59#post-79 Thu, 02 Oct 2008 20:36:54 +0000 m15151 79@http://www.FEA-Forums.com/ <p>Hi,</p> <p>How do you model two areas with different material properties? for example I have two areas resembling a cantilever beam glued together. Half of the beam is modeled with one material and the other half with a different material. how do I specify which area is to receive the necessary material property? </p> http://www.FEA-Forums.com/topic/56#post-78 Thu, 02 Oct 2008 08:34:56 +0000 vadimsgeza 78@http://www.FEA-Forums.com/ <p>Hi!</p> <p>if You have used<br /> emunit,mks<br /> command, then it's definitely A/m^2<br /> but for me it also seems that m,Pa,N,sec is the mks, so - answer is YES!<br /> good luck! </p> http://www.FEA-Forums.com/topic/56#post-77 Thu, 25 Sep 2008 01:41:30 +0000 H2F 77@http://www.FEA-Forums.com/ <p>Bump! </p> http://www.FEA-Forums.com/topic/58#post-76 Tue, 23 Sep 2008 10:39:53 +0000 daka 76@http://www.FEA-Forums.com/ <p>Dear Members;<br /> I am new in using ANSYS and I'm trying to model (using GUI interface) an I sectio steel beam with the beam24 element<br /> but I didn't get the idea behind using a third K point and how to input it besides the i and j nodes of the element.<br /> If someone has got an example on that this would be very helpuful.<br /> Many thanks </p> <p>A Kada </p> http://www.FEA-Forums.com/topic/57#post-75 Sun, 14 Sep 2008 09:53:10 +0000 avicent 75@http://www.FEA-Forums.com/ <p>someone can help me to draw 3D elliptical bodies using ANSYS? </p> http://www.FEA-Forums.com/topic/30#post-74 Wed, 10 Sep 2008 06:43:19 +0000 apoorva 74@http://www.FEA-Forums.com/ <p>Hi,everybody,Can you people help me in my design opti prob. i have defined all d parameters....but when i m running my optimization loops...after 3-4 iterations..it is showing " unknown parameter name_Z3 found,a value of 7.88860905E-31 will b used.<br /> kindly help me as m doin my thesis on this </p> http://www.FEA-Forums.com/topic/45#post-73 Wed, 10 Sep 2008 00:27:51 +0000 H2F 73@http://www.FEA-Forums.com/ <p>Ansys 11 SP1 is compatible with Vista! </p> http://www.FEA-Forums.com/topic/56#post-72 Wed, 10 Sep 2008 00:23:13 +0000 H2F 72@http://www.FEA-Forums.com/ <p>Could somebody please tell me what the units will be when I plot current density (PLVECT,JS, , , ,VECT,ELEM,ON,0) on a model modelled in m,Pa,N,sec . Am I correct in assuming A/m^2? </p> http://www.FEA-Forums.com/topic/55#post-71 Sun, 07 Sep 2008 10:40:58 +0000 tomajele 71@http://www.FEA-Forums.com/ <p><a href="http://zupnije.rkc.si/selca/images/Instructions_rotordynamics2.pdf" rel="nofollow">http://zupnije.rkc.si/selca/images/Instructions_rotordynamics2.pdf</a></p> <p>here you can find link with mine instructions in .pdf format.<br /> Hope, this will help you!<br /> Tomaz </p> http://www.FEA-Forums.com/topic/54#post-70 Sat, 06 Sep 2008 22:35:49 +0000 tomajele 70@http://www.FEA-Forums.com/ <p>Send me an e-mail address and I will give you the instructions. </p> http://www.FEA-Forums.com/topic/53#post-69 Thu, 04 Sep 2008 11:47:51 +0000 xenemesis 69@http://www.FEA-Forums.com/ <p>Hello.</p> <p>I really need help.<br /> My problem seems to be simple but i do not manage to solve it : </p> <p>i have a parameterized geometry and i would like femlab to remesh the problem at each step. </p> <p>Should i use the script ? dunno.</p> <p>Thank you. </p> http://www.FEA-Forums.com/topic/52#post-68 Thu, 04 Sep 2008 00:55:41 +0000 katutxakurra 68@http://www.FEA-Forums.com/ <p>Hi,<br /> I would like to know how to model an organ pipe using comsol. I'm interested on the excitation mechanism and the output impedance, but I would be pleased with any kind of help. thank you! </p> http://www.FEA-Forums.com/topic/51#post-67 Sun, 24 Aug 2008 22:41:27 +0000 cyihep 67@http://www.FEA-Forums.com/ <p>dear tomajele,</p> <p>thank you for your reply and instructions. i'll try it when i can get hold of a ProMechanica.....</p> <p>how reliable is ProMechanica in structural analysis please? Would you have a paper/article that you can share with me with regards to the rotordynamic analysis you have done in ProMech please??</p> <p>i look forward to hear from you again. Thank you!! </p> http://www.FEA-Forums.com/topic/51#post-66 Thu, 07 Aug 2008 10:11:53 +0000 tomajele 66@http://www.FEA-Forums.com/ <p>I can give you instructions how to analyse that kind of rotor with proMechanica.<br /> 1.) You have to model and assamble only 1/4 of the rotor with parm, magnets.<br /> 2.) you will have to define cilindrical coordinate system for the assambly and make him active.<br /> 3.) Define material for all rotor parts.<br /> 4.) Tide up the magnets on the surface of the rotor with perimeter welds. (connections in Pro Mechanica)<br /> 5.) Boundary conditions:<br /> define boundary conditions at both rotor angular sides (rotor pipe + magnets)-by 0 degress and 90 degrees.<br /> movement on r direction is free, movement on tt direction not free, movement on zz direction not free<br /> 6.) Constrain one forehead side of rotor and magnets in zz direction.<br /> 7.) Difine the centrifugal force (n=4800 min-1) in rad/s. 4800/60*2pi=503rad/s)<br /> 8.) controll the mesh<br /> 9.) run the analysis.<br /> I hope these instructions will help you!</p> <p>best regards<br /> Tomaz Jelenc </p> http://www.FEA-Forums.com/topic/50#post-65 Sun, 27 Jul 2008 20:01:45 +0000 cyihep 65@http://www.FEA-Forums.com/ <p>Dear all,</p> <p>I am interested in analyzing the mechanical behaviour, both static and dynamic, of a internal permanent-magnet rotor.</p> <p>Questions i have is:<br /> 1) how do i constraint the rotor model while applying global angular velocity loads?<br /> 2) how do i apply constraints on the magnet and rotor lamination boundary?</p> <p>as a start, i am trying to analysis the deformation and stress due to centrifugal forces when the PM rotor rotates at a speed of 4800rpm, but without any success at the moment.</p> <p>Any suggestions on reference materials/ideas is highly appreciated. Thank you!</p> <p>regards,<br /> cyihep<br /> acyuk_AT_hotmail.com </p> http://www.FEA-Forums.com/topic/49#post-64 Tue, 15 Jul 2008 09:51:51 +0000 bacha 64@http://www.FEA-Forums.com/ <p>dear all,<br /> i am solving a very simple problem, i have analyzed a bracket with plane82 and solid 45 , i was getting the almost same result.. but with shell 63 and 93 , the results are too much different.. plz help me in this regard.<br /> the code is attached here</p> <p>!------for plan382</p> <p>/PREP7<br /> ! material properties</p> <p>ET,1,PLANE82<br /> KEYOPT,1,3,3<br /> R,1,0.003<br /> MPTEMP,,,,,,<br /> MPTEMP,1,0<br /> MPDATA,EX,1,,210E9<br /> MPDATA,PRXY,1,,0.3<br /> ! ----------------DIMENSION<br /> H1=0.4<br /> H2=0.2<br /> H3=0.0907<br /> W1=0.1<br /> W2=0.4<br /> W3=0.9<br /> WLOAD=0.6<br /> R1=0.0907<br /> R2=0.05<br /> R3=0.05<br /> R4=R1/2<br /> R=0.5*H3<br /> Q=1E6<br /> X=0.498888888888889</p> <p>!----------------KEYPOINTS<br /> K,1,0,0<br /> K,2,W1,0<br /> K,3,0,H1+H2<br /> K,4,W1+W3,H1+H2<br /> K,5,W1+W3,H1+H2-H3<br /> K,6,W1,H2<br /> K,7,W1+W3,H1+H2-R<br /> K,8,W1+W3+R,H1+H2-R<br /> K,9,W2,H1+H2<br /> K,10,W1+X,H1+H2-H3</p> <p>!------------------LINES</p> <p>L,1,3<br /> L,3,9<br /> L,9,4<br /> LARC,4,5,8,R<br /> L,5,10<br /> L,10,6<br /> L,6,2<br /> L,2,1<br /> LFILLT,1,2,R1<br /> LFILLT,5,6,R3<br /> LFILLT,6,7,R2<br /> AL,ALL<br /> !---------------MESHING<br /> SMRTSIZE,3<br /> AMESH,1</p> <p>!-------------------------------SOLUTION</p> <p>ANTYPE,0<br /> DL,8,,ALL,0<br /> SFL,3,PRES,Q,<br /> FINISH<br /> /SOLU</p> <p>SOLVE<br /> !--------------------------------------</p> <p>/POST1<br /> PLNSOL,S,EQV<br /> !-----------------------------------<br /> plz solve for shell elemnt 63 or 93 </p> http://www.FEA-Forums.com/topic/48#post-63 Fri, 20 Jun 2008 03:23:17 +0000 johnsodas 63@http://www.FEA-Forums.com/ <p>I want to create a load which will be constant(constant value)until a displacement(let's say 4mm) and then the load will become zero .How can I do this?? </p> http://www.FEA-Forums.com/topic/47#post-62 Fri, 30 May 2008 12:32:01 +0000 royaleagle 62@http://www.FEA-Forums.com/ <p>hi guys , am student of aerospace engg , am doing project on nonlinear buckling of a curved composite panel with a circular cutout , the prob i had that when i run the nonlinear analysis , it got terminated nd reason for that shows as "" DOF limit exceeded""<br /> i tried all possiblties to solve that prob bt i cdnt &gt;&gt;&gt; can any body help me plz &gt;&gt;&gt; </p> http://www.FEA-Forums.com/topic/45#post-61 Fri, 30 May 2008 07:56:50 +0000 royaleagle 61@http://www.FEA-Forums.com/ <p>i heard there is ANSYS 11 which is compatiable with vista , bt still i faild to get copy for ma self since am using vista as well , hopfully i ll be getting ANSYS 11 by monday , i ll let u know abt it more in case if i get it ..<br /> regards </p> http://www.FEA-Forums.com/topic/46#post-60 Tue, 27 May 2008 22:53:20 +0000 mdrajik 60@http://www.FEA-Forums.com/ <p>Is catia V5R15 or any other version of catia is compatible with Windows Vista. </p> http://www.FEA-Forums.com/topic/45#post-59 Tue, 27 May 2008 22:47:33 +0000 mdrajik 59@http://www.FEA-Forums.com/ <p>I have contacted Ansys. They have told that Ansys 12 will be released probably in Feb 09, which will be compatible with windows vista. </p> http://www.FEA-Forums.com/topic/45#post-58 Tue, 27 May 2008 16:07:58 +0000 NEiNastran 58@http://www.FEA-Forums.com/ <p>Have you contacted Ansys?</p> <p><a href="http://www.nenastran.com">NEiNastran</a> </p> http://www.FEA-Forums.com/topic/45#post-57 Sat, 24 May 2008 07:49:13 +0000 mdrajik 57@http://www.FEA-Forums.com/ <p>I have a dell XPS1530 laptop with operating system windos vista.But i am not able to install &#38; run Ansys10 in this operating system. The company is also not providing the drivers of this model for Windows XP. So how can i install ansys10 in this system. Please try to help me by giving your suggessions. </p> http://www.FEA-Forums.com/topic/44#post-56 Fri, 09 May 2008 13:51:49 +0000 blaqb0x 56@http://www.FEA-Forums.com/ <p>Hi,</p> <p> I figured one way of doing this....</p> <p>Go to cross section parameters and you can pick a point in the subdomain to plot over time. </p>