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Found 29 results

1. ## Mass in .out file diffrent from Mass in Modell

Hi everyone, I am wondering why the Mass in my .out file is diffrent from the Mass in my Hypermesh model. It is in tons, so dont wonder why its that low. This is from the .out file: This is the Design Space: And This is the rest: Thanks in Advance.
2. ## Discrepancy between FEM mass and mass during optimization

Greetings, I have a FEM model whose mass calculated by Hypermesh (under Tools > masscalc) is equal to 2.22 kg I am running a free-size optimization of this model. From the design parameters summary reflected in the *.out file (shown below), the sum of design and non-design mass is equal to 2.51524 kg: After the iterations begin, the mass registered in iteration 0 is 2.34766 kg Question: Is it wrong to expect the following: FEM mass = (design + non-design mass) = mass at iteration 0? Why are these values different?
3. ## compliance response with mass response in one run

Hi guys, how to run on one model optimization with compliance response and mass response? I can't make this happen. I already created in hyperstudy two models with different .tpl files - one for compliance and one for mass, then I get responses from .hgdata >> optimization >> objective. I can't open .out in hyperworks readers, work only with ASCII. It is possible to combine compliance and mass responses?
4. ## conm2 Display CONM2 mass value

Hi all guys, I'm modelling a platform with different devices linked to it. I modelled the devices as concentrated masses linked to platform with rbe2 elements. The problem is that, activating Display Element Handles, I can see the element type name (CONM2) but I can't see the mass value of each mass. Is there a way to display, along with the element type name, the associated mass value?? Thank you so much
5. ## Add mass for rigid body

Hi, I am trying to add mass to a sphere rigid body by adding GRAV load. Because I used shell elements to represent this rigid sphere so the volume is not true. Could you please tell me how to specify mass for this rigid body? Tks
6. ## SPH meshing problem

Hi,I am trying to simulate a bird impact on a plate with RADIOSS. So I am creating my model on hypermesh now, i chose to consider the bird as a fluid with a density of 438 kg/m3. I would like to work with SI units and the dimensions of the bird are : 0.1325m long cylinder with two hemisphere ends having a radius of 0.075m. I am now trying to mesh this geometry with the SPH module in hypermesh. So i entered a pitch of 1e-3m and a density of 438kg/m3 as i said before. But when i create the mesh, nothing happen and i only get this message "0 mass elements created". I attached my file with the topic. I don't know what could be my error, more of that I tried to do it using mm instead of m and it worked... But I really want to use SI units. Thank you in advance for your help, Gaspard. BirdStrikeSI.hm
7. ## Direct Transient Analysis of a Beam

Hello everyone, I'm trying to set up a direct transient analysis of the beam you see in the picture below (simplified geometry): The beam is meshed with tetra elements. On top the beam is constrained in all dof. In the middle of the beam is a hump and the mass of it has an influence on the eigenfrequency of the beam. At the lower end of the beam a periodically enforced displacement in the range of the eigenfrequency (3 kHz < f < 4 kHz) of the beam is applied. With the FE analysis I want to get information about the following questions: What is the stress at the top of the beam? Later I would like to get information about fatigue. What is the eigefrequency of the beam? What is the exact displacement of the hump in the middle of the beam when a certain displacement is applied at the lower end with its eigenfrequency? So far I've tried to adapt the tutorial "OS-T: 1310 Direct Transient Dynamic Analysis of a BracketOS" to my purposes but I have problems with applying the periodically enforced displacement. Can someone tell me what the best way is to realize this problem with optistruct? Thank you in advance Felix Link to the tutorial: https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/direct_transient_dynamic_anlaysis_bracket_r.htm#direct_transient_dynamic_anlaysis_bracket_r
8. ## Lattice Structure Type 2

Hı everyone, I want to do lattice optimization with the second type lattice structure. The analysis has resulted, but mass is increasing according to not optimization model, fisrt model. So lattice optimization is heavier than fist model. I think it should not be that way. Thank you.
9. ## MASS VALUE

Hi , I would like to know if there is any command to get this value shown for an element. I tried nonstructuralmass, structuralmass, mass as datanames but I'm getting the total value and not the added part. The non structural part always ends to being zero. Like basically, how to access all the mentioned values in either f10 checks for 2D and 3D elements.
10. ## Added Mass Value Using HM

Hi , I have following the posts in the forum, this time I have a question regarding a problem I'm facing. I am currently working on bringing several checks we do for a full vehicle in Primer to HM. One of them is the C.O.G of the vehicle and the total scaled mass. I have checked the F10-> Time option and after checking for the set dt2ms value, I'm getting the total added below as shown in the picture. I want to get that value (0.0809878) directly. Is there any method/command for accessing that output displayed there?? I have tried hm_getelemchekbounds and hm_getelemcheckvalues but after that I will required to do a lot of work to get the total added mass. Any suggestions...
11. ## Topology Optimization of truss

Sir can you tell me ,how can i calculate th6 NODED 11 MEMBERS TRUSS.hme weight of members of the optimised truss in the result window?I am attaching my file for you﻿.
12. ## Different Mass on .OUT file and on imported file - Free Size Optimization

Hello everyone, I'm currently running an composite optimization on a part and today I noticed that the mass I get on the .out file and on the model I import after the size optimization is different. On this optimization, I try to minimize the compliance of the part while constraining the mass between 3200g and 3600g. Here is what I get on the .out file: Here is what I get on the imported model: While on the output file I get a total mass of 3600 as requested, when I import the model, the total mass is now 5322. I've searched around, followed tutorials and nothing helped. I tried opening the *.inc file as suggested on tutorial OS-3400 but the result is the same (the same as if I just import the .fem file resulting from the free size optimization). I've looked on this forum and I found something about the CMF file instead but after the free size optimization, I only get the *.HM.ent.cmf and not the *.HM.comp.cmf as mentioned here: I also tried running the optimization with MATINIT set to 1 on opticontrol but once again, the result is the same... Can someone please help? Thank you very much!
13. ## Difference in mass, size optimization

Dear optistruct users, I have a question regarding the sizing optimization. Currently I am performing a size optimization of a truss structure. The model consists of lines which are meshed into Cbeam elements and design variables are generated in order to perform a size optimization. The design is subjected to multiple load cases. The objective of the optimization is to minimize the mass of the structure. Constraints are defined for the member stresses and displacements. The optimization works fine. When I calculate the mass of the structure by using tools --> mass calculation, I obtain a mass of 2.056 ton with a volume of 2.620 * 10^8 mm^3. I have used the standard steel material properties (Rho=7.85 * 10^-9 mm^3). I have defined point masses which are defined in a separate compnent with a total mass of 1.245 ton. When I look at the first iteration step (iteration 0) in the output file. I see that the mass is equal to 2.358 Ton and that the volume is equal to 1.42394*10^8 mm^3. This confuses me. So to make it clear: Before first iteration step: Mass= 2.056 Ton Output file, Iteration zero: Mass = 2.358 - 1.245 = 1.13 ton I understand that the masses of the point masses are incorporated into this mass. But why is the volume changed of the design? On the internet I found the following written about this difference, but it is still not clear for me. Do I make a mistake, how should I interpret these masses? Can someone make this clear for me? Regards, Michael
14. ## MotionView importing problem: CAD or FEM model (with mass and inertias)

Hey Guys! I have faced the next problem when I tried to Import CAD or Fine Element Model With Mass and Inertia in Motion View. The STEP file was imported and you can see on the attached image the „bodies” but the „graphics” aren’t visible. It is written at the Graphical source that "error evaluating". I tried to import in the 2017 version of HW, but it didn't work due to importing/conversion error. What did I do wrong? Could you please help me in this matter? Thank you for your help in advance! Best regards, Tüki
15. ## Meaning of result ?

What is the meaning some of the results such as mass and node mass or density ? And what other things we should check in explicit analysis apart from what we need such as displacement and stress.
16. ## Rigid body

Hi, i have created 1D rigid elements, after creating the mass of component increases. checking the mass of component without rigid gives me the required value so i checked the value of mass in rigids and it gave me extra mass. when i checked the mass using utility tool i didnt find any mass value given for the rigids. whats wrong in the model??
17. ## SANDWICH SHELL INITIALIZATION

Hi, I am solving one crash analysis, i received the following warning message, WARNING ID : 519 ** WARNING IN SANDWICH SHELL INITIALIZATION DESCRIPTION : -- PROPERTY ID : 8100003 -- PROPERTY TITLE : Windshield SHELL ID=3664432 MASS SUM OF LAYER MASS(0.6913370997374E-06) DIFFERS FROM TOTAL(0.7407183211472E-06) can you please suggest me a solution
18. ## Procedure for Mass Scaling in RADIOSS

Hi. I watched the videos on this link https://www.youtube.com/watch?v=VWCcwranpqY&index=4&list=PLQ7KUGFuVz4uyfru1mekcmyqb783jA862 4 Procedure for Mass Scaling in RADIOSS But when I press F10 it said that "there are no vail elements on the screen". Could any one explain me the reason and how to choice the "failure criteria" Thank you
19. ## Print/add more model data in .out file

Hi, is it possible to add the center of gravity and mass moment of inertia as information to the .out file? In my .out file only volume and total mass fo the model are output. Unfortunately - still after thorough checks - there is a mismatch between the volume and total mass which is computed via summary/moment of inertia template and the value in the .out file. That is why I expect a mismatch for the mass moment of inertia and center of gravity as well. Kind regards
20. ## Modal Analysis

Hello, I am running modal analysis on a helicopter model that has both 2D and 3D elements. I created rigid links and applied mass at the middle node (to represent the lithium ion batteries) however I am not sure which card image to assign for the rigis links and the mass. I tried PMASS and got an error. When I take out the rigids and the masses, I can run the analysis without problem. Thank you in advance, Muge
21. ## FRF Response

I would like to know if when I do the FRF in OptiStruct the result obtained is normalized by the mass, if it has some other type of normalization or if the result is "pure"?
22. ## Responses

I am Ing. Andrés Palacios, please, if you can, help me with information about "Responses" of Hypermesh responses, what they are and how are used in the optimization tab, such as mass, volume, static force, beadfrac and the other, for a thesis of master. thank you very much
23. ## Create MASS Element

I am working on a Hybrid3 Head Model. The geometry I have is a hollow Surface File. I have created a 2D mesh and I want to match the weight of the head by creating a mass at the COM. Please let me know how to do the same. Thank you, Datta
24. ## Simple spring-mass system

Hello, I´m new at HyperMesh and I´d like to know how can I simulate a very simple spring-mass system in HyperMesh to obtain the modal frequency of it. Can somebody help me? Which elements, property and type of analysis should I use? Thanks in advance.
25. ## Mass flux for outflow BC

I want to simulate a geometry using Acusolve (AcuConsole) and I have a condition of mass flux for my outflow boundary, how can setup like this? The Acu Console only gives me the option of pressure values. Thank you.
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