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Found 21 results

1. DEPENDENT TIME HEAT FLUXES

Hello, I'm new in Altair Hypermesh and I'm doing a thermal analysis of an electrospindle. I have to analyze the grid temeperatures in the following case: There is a bearing in one extrem of the spindle and another one in the other extreme. They generate a constant heat flux, but with a different value. Besides, the electric motor is another heat source. With the aim of evacuate the heat, I apply a negative flux in housing's Surface. The problem is that I want to do a heat transient analysis, in which the negative flux is always active, but the bearing's and the motor's fluxes are disabled when 10 minutes have been passed. Anyone knows how I can introduce a flux that depends of the time? Greetings, DavidSol.
2. lgdisp Nonlinear large displacement direct transient analysis problem

Hello, I work on a suspension construction. I have done done a static analysis due to vehicle mass (I managed to do both linear and lgdisp nonlinear). However, I also need to perform a dynamic analyis due to riding over an obstacle and I have encountered few problems with the simulations: 1) As an excitation I use a displacement of a triangular shape (picture below). It works fine for the direct transient (linear), however, when performing nonlinear direct transient (with and without LGDISP on) the excitation is not as I intend it to be (second picture). The plots show the displacement in the Y direction in nodes where the displacement is applied in the model. The actual input load data is a triangle as in the first picture. Therefore, I do not understand why when performing nonlinear transient the displacement starts to increase before it is larger than 0 in the input data. There should not be any loading applied before 0.100 s and when changing to nonlinear analysis somehow there is a loading. Also the system does not go back to the zero position. 2) the second problem is that when i use nonlinear direct transient the simulations calculates without any problem but when turning on the LGDISP option I encounter convergence problems: *** ERROR # 4966 *** Minimum time increment reached, analysis aborted. I tried changing the minimum time increment but it does not help. I use TSTEPNL and NLADAPT setup. What options should I change so that the convergence problems does not happen? Thank you very much in advance for any help.
3. Transient temperature analysis

Hi! I would like to make a transient analysis with temperature. I mean: Going for example from 17 to 23 degrees of the temperature of a body in 1 hour. Making steps of 10 minutes for example (total of 6 steps). I tried to do it with TABLED, TSTEP and creating a temperature LOAD but it doesn't work. It says : " *** ERROR # 2094 *** EXCITEID on TLOAD1 # 17 data references follower force or nonexistent DAREA/static loading with ID # 16." Could you help me? Big thanks in advance
4. Coupled Thermo-Mechanical SPH Solution

Is it possible for Radioss to solve a transient coupled thermo-mechanical problem using smooth particle hydrodynamics? For an example, My fluid's viscosity is strongly a function of temperature, where temperature is strongly a function of strain and time, where strain is a function of temperature, viscosity, and power input. Can anyone tell me if Radioss is an appropriate solver for this type of problem?
5. Transient thermal analysis

Hi, I want to solve a simple transient thermal analysis where I give thermal input using Temperature option. what is the procedure to solve the above problem.
6. Thermal Analysis

Hello, I am trying to figure out how to model the heat generation on a brake rotor during braking using Optistruct. Are there any guides that describe this process or something similar to this? How would you approach this? The total energy of the system is known and will be evenly distributed over three brake rotors to stop the vehicle in a given time. Now, I need to model the maximum temperature reached.
7. Questions regarding NLGEOM analysis

Hello, in my analysis of a curve-drive-part is a rotation as SPC, solids for the curve-part (red) and a rigid-spider (blue) to transfer the rotation displacement to the solids. I use an NLGEOM-analysis, because i want to simulate the contact between the other parts (not in picture) and the curve-part. In this analysis the curve-part shows a strange deformation and the contact force is going very high. There is no constraint or force, that explained the deformation. Attached filses: Topf_Start_1 - front view with a distance measure of 211.666 Topf_Start_2 - side view Topf_End_1 - front with a distance measure of 201.110 Topf_End_2 - side view It is a model in optistruct, but for the solving is radioss used, because the large sliding contact. I want to understand possibly failures in the model. greetings Pierre
8. how to creat transient curve?

Hi, members. I want to creat time domain curve. conditions is as below. Acceleration: 9g, 5g direction: X, Y and X+Y T: 100hz How to get this curve? I'll use this curve to solve the dynamic transient analysis.
9. Delayed Convection

Hi All, I have a question involving the HyperMesh preprocessor. I'm trying to run a transient thermal analysis, where there is a consistent base boundary condition, and convection is applied, but only after a delay. I'm having a hard time figuring out how to apply convection partway through the analysis. For example, I'm allowing the part to heat for 25 seconds, and then turning a fan on and blowing on it for the last 25. I have my TLOAD1, TABLED1, SPCD, and SPC collectors for convection, but I can't figure out how to apply this delay. I tried setting the TABLED1 value to 0 for the first 25 seconds, but that just sets temperature to zero I believe. I imagine the DELAY_OPTION would be helpful, but I don't know how. Thanks very much for any help you can provide.
10. Frequency Response Analysis

How to perform simulation (Nastran) on a system by applying a sinusoidal load of 0.1g which swept from 10-50 Hz which varies at rate of 1Hz/min ??? How to use the Time domain in solver deck? In Modal Frequency Response i don't use varying rate (1 Hz/min) . So please let me know how to apply the time here.....!!!
11. Combined time step in transient solution

I am running a transient dynamic solution with enforce displacement. Is that possible that i am able to run my solution for 3 second with bigger timestep and then finer timestep for the next 3 second?
12. 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
13. AcuFieldView: open dataset of transient analysis? how?

Hi all, Can I open dataset of transient analysis in one time? E.g: review data for minute of 2,6,8 and 10 in a window.. Right now I'm using Hyperview for easy change review of data at different time step.. Thanks
14. Contact and convergence error

Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
15. Transient Analysis

To evaluate the response of a structure submitted to a periodic sine wave force in the time domain, can I define the OptiStruct loadstep as "transient direct"? Does "transient direct" and "transient modal" differ in computational cost only?
16. Multiple Loads in a Transient Analysis

Hi, I need to resolve a transient(direct) analysis on my model. There are 8 different imported load that I merged into 1 with a LOADADD card, then I create a TABLED1. Now I need to create a TLOAD1 to give the forces a time dependence function. the problem is that TLOAD1 field "EXCITEID cannot reference the LOAD and LOADADD Bulk Data Entries". How can I resolve a transient analysis having more than 1 load? Thanks for the help!
17. Acusolve - Exhaust Manifold Simulation

Hello Forum, I am a student and am learning how to use acusolve, I would like to know how to make a simulation of an exhaust manifold. I want to know what I have to define so I can have inlet conditions that change by time, do I only need to modify boundary conditions? Thanks,
18. Contact and convergence error

Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
19. Direct Transient Dynamic Analysis Problem

Hi I have a connecting rod that is subjected to two loads, Tensile (Admission phase) and Compression (Combustion phase). Both loads have TLOAD2 as their card image and hence each of them have their own loadstep. When observing the results, i would like to see both loadsteps one after another eg: t1 : Combustion , t2 : Admission, t3 : Combustion , t4 : Admission...... I have derived both results together but it showed me the combustion results first then after t500 only it will show admission. Is there anyway to correct this? Regards.
20. Optimization based on Transient Load

Hi All, Is it possible to perform topology optimization based on the response from transient analysis. If so, for stress response what should be the Response Type? Thankyou N.K
21. The output ".disp" in the transient dynamic simulation of a vibration

Hello every one, I am looking how to have the output ".disp" in the direct transient dynamic analysis, in the tutorials they just show how to have this output in the direct frequency response analysis, I did the same steps in the transient analysis and it gives me something witch is not that good as I did configure my simulation (yeah I guess): The step that I used is 0.005s and in the ".disp" the step is about 4.9s. Hypermesh 2014 Thank you for your help. Regards, Samir simulation.rar
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