# \#dynamic **URL:** https://prepomax.discourse.group/tag/dynamic/7.md [Latest](https://prepomax.discourse.group/latest.md) · [Categories](https://prepomax.discourse.group/categories.md) · [Tags](https://prepomax.discourse.group/tags.md) --- ## [How can I plot the internal and kinematic energy in PrePoMax?](https://prepomax.discourse.group/t/how-can-i-plot-the-internal-and-kinematic-energy-in-prepomax/1654)
**Author:** [@Majid](https://prepomax.discourse.group/u/Majid)\ **Replies:** 16\ **Last updated:** [September 11, 2026, 6:46pm UTC](https://prepomax.discourse.group/t/how-can-i-plot-the-internal-and-kinematic-energy-in-prepomax/1654 "2026-09-11T18:46:33Z")
Hello, I hope you are doing well. As you know, there is a possibility to plot the internal and kinematic energy after finishing a simulation. Does anyone know how I can plot them in PrePoMax? --- ## [The problem of passing through a surface without visualizing it in dynamic analysis](https://prepomax.discourse.group/t/the-problem-of-passing-through-a-surface-without-visualizing-it-in-dynamic-analysis/3437)
**Author:** [@emisar](https://prepomax.discourse.group/u/emisar)\ **Replies:** 1\ **Last updated:** [April 26, 2026, 11:23am UTC](https://prepomax.discourse.group/t/the-problem-of-passing-through-a-surface-without-visualizing-it-in-dynamic-analysis/3437 "2026-04-26T11:23:45Z")
Hello, when performing dynamic analysis, even though I added hard and friction to the surface interaction section, defined master and slave surfaces, and tightened the mesh structure at the collision site, the impact is … --- ## [Dynamic stress seems less in comparison to the static load!](https://prepomax.discourse.group/t/dynamic-stress-seems-less-in-comparison-to-the-static-load/3390)
**Author:** [@Akhil](https://prepomax.discourse.group/u/Akhil)\ **Replies:** 3\ **Last updated:** [April 4, 2026, 6:09pm UTC](https://prepomax.discourse.group/t/dynamic-stress-seems-less-in-comparison-to-the-static-load/3390 "2026-04-04T18:09:19Z")
So, I’m running an analysis where, I put two steps: 1.) A static step- with a moment load-A with amplitude (constant with time for 2 seconds) 2.) Another with a dynamic step- with another moment load-B with amplitude (… --- ## [Convergence in Dynamic Simulation](https://prepomax.discourse.group/t/convergence-in-dynamic-simulation/3366)
**Author:** [@Kayky\_Brambilla](https://prepomax.discourse.group/u/Kayky_Brambilla)\ **Replies:** 9\ **Last updated:** [March 23, 2026, 6:09pm UTC](https://prepomax.discourse.group/t/convergence-in-dynamic-simulation/3366 "2026-03-23T18:09:48Z")
Hello, I’m working on my final year project about an impact attenuator and I’m starting with PrePoMax. To ensure the simulation is accurate, I’m redoing a dynamic simulation I saw in a scientific article. The problem I’… --- ## [Damping contact in dynamic implicit simulation](https://prepomax.discourse.group/t/damping-contact-in-dynamic-implicit-simulation/3283)
**Author:** [@Tymkhana](https://prepomax.discourse.group/u/Tymkhana)\ **Replies:** 9\ **Last updated:** [February 25, 2026, 11:27am UTC](https://prepomax.discourse.group/t/damping-contact-in-dynamic-implicit-simulation/3283 "2026-02-25T11:27:29Z")
Hello together, currently I’m trying to get a dynamic implicit 2D simulation to converge. I want so simulate the press in of a copper pin into a plastic cavity. I have set the K-Value to 100000 MPa/mm³ that isn’t that s… --- ## [Dynamic Step: tension impulse without tether](https://prepomax.discourse.group/t/dynamic-step-tension-impulse-without-tether/3272)
**Author:** [@JKnight](https://prepomax.discourse.group/u/JKnight)\ **Replies:** 3\ **Last updated:** [February 20, 2026, 3:04pm UTC](https://prepomax.discourse.group/t/dynamic-step-tension-impulse-without-tether/3272 "2026-02-20T15:04:19Z")
I’m simulating a test where the loading condition is dropping a known weight a known distance until a tether snaps tight and loads the part. I want to use a dynamic step do this, but I don’t know how to create the tether… --- ## [Roller and belt contact analysis of transmission](https://prepomax.discourse.group/t/roller-and-belt-contact-analysis-of-transmission/3231)
**Author:** [@8080\_1](https://prepomax.discourse.group/u/8080_1)\ **Replies:** 10\ **Last updated:** [February 4, 2026, 12:10pm UTC](https://prepomax.discourse.group/t/roller-and-belt-contact-analysis-of-transmission/3231 "2026-02-04T12:10:53Z")
Hii folks, Today I was simulating the rubber and belt contact analysis. Maybe my contacts are not right. please check it and give any suggestion over it I am trying to simulate this. here is the file --- ## [Bar Impact Explicit Dynamics](https://prepomax.discourse.group/t/bar-impact-explicit-dynamics/3202)
**Author:** [@nightshade1005](https://prepomax.discourse.group/u/nightshade1005)\ **Replies:** 13\ **Last updated:** [February 1, 2026, 8:07am UTC](https://prepomax.discourse.group/t/bar-impact-explicit-dynamics/3202 "2026-02-01T08:07:17Z")
I am simulating a bar of SS crashing into a concrete wall at a speed of 1600 m/s, i already did this in a different solver and tried the same in this but the results are different. The conditions and parameters are all t… --- ## [A big Thank You!](https://prepomax.discourse.group/t/a-big-thank-you/3170)
**Author:** [@arnie](https://prepomax.discourse.group/u/arnie)\ **Replies:** 2\ **Last updated:** [January 4, 2026, 3:08pm UTC](https://prepomax.discourse.group/t/a-big-thank-you/3170 "2026-01-04T15:08:22Z")
Happy holidays to all ! As 2025 closes it’s curtains, I just want to say that I am not surprised that PrePoMax keeps growing in user freindliness and popularity. With all the work that goes into developing and tweaking … --- ## [The crush can Analysis on Prepomax](https://prepomax.discourse.group/t/the-crush-can-analysis-on-prepomax/3166)
**Author:** [@8080\_1](https://prepomax.discourse.group/u/8080_1)\ **Replies:** 5\ **Last updated:** [December 25, 2025, 9:04am UTC](https://prepomax.discourse.group/t/the-crush-can-analysis-on-prepomax/3166 "2025-12-25T09:04:17Z")
I was working on the crush can analysis on Prepomax 2.4.0 There are multiple doubts I need to ask Since it’s a “crush can”, I have 3 parts velocity plate, crush can, fixed plate Can just give the steps to follow in FE… --- ## [I am not able to import the attached step file](https://prepomax.discourse.group/t/i-am-not-able-to-import-the-attached-step-file/3091)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 13\ **Last updated:** [November 14, 2025, 11:26am UTC](https://prepomax.discourse.group/t/i-am-not-able-to-import-the-attached-step-file/3091 "2025-11-14T11:26:42Z")
Hi, Iam not able to import the step file. If I import the file we get errors. Any idea what is wrong please. --- ## [Model of the double-bearing overhung rotor](https://prepomax.discourse.group/t/model-of-the-double-bearing-overhung-rotor/3005)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 38\ **Last updated:** [October 15, 2025, 11:13am UTC](https://prepomax.discourse.group/t/model-of-the-double-bearing-overhung-rotor/3005 "2025-10-15T11:13:05Z")
Dear All, Can you please share an example of how to build the model of the double-bearing overhung rotor --- ## [.eig file not found by Modal Dynamics step](https://prepomax.discourse.group/t/eig-file-not-found-by-modal-dynamics-step/2955)
**Author:** [@Giuseppe](https://prepomax.discourse.group/u/Giuseppe)\ **Replies:** 4\ **Last updated:** [September 8, 2025, 6:35pm UTC](https://prepomax.discourse.group/t/eig-file-not-found-by-modal-dynamics-step/2955 "2025-09-08T18:35:30Z")
Hi everyone, I’m new here and i hope not to miss the correct discussion. My goal is to perform a simple modal dynamics analysis of a cantilever beam, Step 1 computes the first three modes with a Frequency step, then Ste… --- ## [A question about impact simulation](https://prepomax.discourse.group/t/a-question-about-impact-simulation/2935)
**Author:** [@Myjinn](https://prepomax.discourse.group/u/Myjinn)\ **Replies:** 3\ **Last updated:** [August 16, 2025, 11:45am UTC](https://prepomax.discourse.group/t/a-question-about-impact-simulation/2935 "2025-08-16T11:45:19Z")
ABS-BOX.pmx (748.8 KB) I am honored to be using PrepoMax for impact analysis, and I am a newcomer in this field. I created a simplified model to verify all the settings. The model is an ABS box with a virtual screw fixa… --- ## [Steady State Dynamics - No Imaginary Results](https://prepomax.discourse.group/t/steady-state-dynamics-no-imaginary-results/2885)
**Author:** [@Mechgru](https://prepomax.discourse.group/u/Mechgru)\ **Replies:** 5\ **Last updated:** [July 25, 2025, 11:36am UTC](https://prepomax.discourse.group/t/steady-state-dynamics-no-imaginary-results/2885 "2025-07-25T11:36:47Z")
Hi, I have carried out a Steady State Dyanmics step and obtained results. The model is a solid with first order tetrahedral elements (to reduce the run time). I have used ‘constant’ damping with a value of 0.0175 (I ass… --- ## [Comparing material stress-strain curve with uni-axial tension test analysis](https://prepomax.discourse.group/t/comparing-material-stress-strain-curve-with-uni-axial-tension-test-analysis/1040)
**Author:** [@Cimek](https://prepomax.discourse.group/u/Cimek)\ **Replies:** 29\ **Last updated:** [July 25, 2025, 6:48am UTC](https://prepomax.discourse.group/t/comparing-material-stress-strain-curve-with-uni-axial-tension-test-analysis/1040 "2025-07-25T06:48:29Z")
I’m testing the new Johnson-Cook material model so I made a square cube model meshed with 6 parabolic tetrahedron C3D10 elements. I applied symmetry constraints to 3 sides to prevent rigid body motion and displacement to… --- ## [Base excitation via keyword editor](https://prepomax.discourse.group/t/base-excitation-via-keyword-editor/2842)
**Author:** [@Shah](https://prepomax.discourse.group/u/Shah)\ **Replies:** 4\ **Last updated:** [July 18, 2025, 12:04am UTC](https://prepomax.discourse.group/t/base-excitation-via-keyword-editor/2842 "2025-07-18T00:04:48Z")
Hi all, I was trying to run a steady-state dynamics analysis with base excitation. Since PrePoMax currently does not support \*base motion, I tried to use “edit calculix keyword” route to set up the model. As you know … --- ## [Help Needed: Aircraft simulation in prepomax (Load ,Boundary Conditions, and Validation)](https://prepomax.discourse.group/t/help-needed-aircraft-simulation-in-prepomax-load-boundary-conditions-and-validation/2799)
**Author:** [@Dev](https://prepomax.discourse.group/u/Dev)\ **Replies:** 9\ **Last updated:** [June 27, 2025, 9:29pm UTC](https://prepomax.discourse.group/t/help-needed-aircraft-simulation-in-prepomax-load-boundary-conditions-and-validation/2799 "2025-06-27T21:29:05Z")
Hello, I am new to PrePoMax and would really appreciate your help. I am trying to simulate an aircraft structure made of carbon fiber material with 2 mm thickness, and I have several questions: 1) Linear vs Nonline… --- ## [Modal analysis on a fan - miss correlation with Solidworks Simulation](https://prepomax.discourse.group/t/modal-analysis-on-a-fan-miss-correlation-with-solidworks-simulation/2782)
**Author:** [@MarcoMeccAlte](https://prepomax.discourse.group/u/MarcoMeccAlte)\ **Replies:** 13\ **Last updated:** [June 23, 2025, 7:17am UTC](https://prepomax.discourse.group/t/modal-analysis-on-a-fan-miss-correlation-with-solidworks-simulation/2782 "2025-06-23T07:17:28Z")
Good afternoon All, I’m a newer user of PrePoMax, and I’m now making some correlation tests with Solidworks Simulation (that I’m currently using in the company where I’m working). I did a modal simulation on a fan made… --- ## [Can speedup modelLoading and meshing?](https://prepomax.discourse.group/t/can-speedup-modelloading-and-meshing/2729)
**Author:** [@arthur314](https://prepomax.discourse.group/u/arthur314)\ **Replies:** 2\ **Last updated:** [May 26, 2025, 6:02pm UTC](https://prepomax.discourse.group/t/can-speedup-modelloading-and-meshing/2729 "2025-05-26T18:02:29Z")
When loading a large model (which may contain many parts), prepomax can take a long time， and it also takes a long time to partition the mesh，I found that it is a serial process one by one. Can we change it to parallel p… --- ## [Output of kinetic energy not working in steady state dynamics step](https://prepomax.discourse.group/t/output-of-kinetic-energy-not-working-in-steady-state-dynamics-step/2447)
**Author:** [@Robert](https://prepomax.discourse.group/u/Robert)\ **Replies:** 3\ **Last updated:** [May 18, 2025, 1:17pm UTC](https://prepomax.discourse.group/t/output-of-kinetic-energy-not-working-in-steady-state-dynamics-step/2447 "2025-05-18T13:17:36Z")
So why? What does work is the output of the internal energy. Thank you very much. --- ## [MbDFEM: Combining Multibody Dynamics and Finite Element Method](https://prepomax.discourse.group/t/mbdfem-combining-multibody-dynamics-and-finite-element-method/2607)
**Author:** [@aiksiongkoh](https://prepomax.discourse.group/u/aiksiongkoh)\ **Replies:** 2\ **Last updated:** [April 15, 2025, 8:45pm UTC](https://prepomax.discourse.group/t/mbdfem-combining-multibody-dynamics-and-finite-element-method/2607 "2025-04-15T20:45:56Z")
Hi: Jose Egas and I have been working on combining Multibody Dynamics and Finite Element Method inside FreeCAD. Our initial results are shown at https://forum.freecad.org/viewtopic.php?t=96007 We would appreciate your… --- ## [Assigning surface spring using local coordinate system](https://prepomax.discourse.group/t/assigning-surface-spring-using-local-coordinate-system/2494)
**Author:** [@TKosir](https://prepomax.discourse.group/u/TKosir)\ **Replies:** 1\ **Last updated:** [February 22, 2025, 8:26am UTC](https://prepomax.discourse.group/t/assigning-surface-spring-using-local-coordinate-system/2494 "2025-02-22T08:26:04Z")
Hi, Is there a way to assign a surface spring to a surface in PrePoMax, but assign the directional stiffness values using a reference coordinate system? Thanks! --- ## [Frequency step on deformed structure](https://prepomax.discourse.group/t/frequency-step-on-deformed-structure/2422)
**Author:** [@TKosir](https://prepomax.discourse.group/u/TKosir)\ **Replies:** 50\ **Last updated:** [February 1, 2025, 9:22am UTC](https://prepomax.discourse.group/t/frequency-step-on-deformed-structure/2422 "2025-02-01T09:22:35Z")
Greetings, I am having troubles figuring it out, if frequency step on deformed structure due to previous static step is even possible? So far, the only thing that I have been able to do is to include the prestressed sta… --- ## [crash while starting results animation](https://prepomax.discourse.group/t/crash-while-starting-results-animation/2074)
**Author:** [@Danial](https://prepomax.discourse.group/u/Danial)\ **Replies:** 14\ **Last updated:** [January 22, 2025, 9:07am UTC](https://prepomax.discourse.group/t/crash-while-starting-results-animation/2074 "2025-01-22T09:07:01Z")
I’ve experimented with explicit dynamic, simple model were lead ball hits steel plate. In results i got about 300 time steps. When time to time I switch steps PPM crash. And when try to start animation error massage appe… --- ## [2 DoF Mass-Spring System - SPRING2 & SPRINGA Element Types](https://prepomax.discourse.group/t/2-dof-mass-spring-system-spring2-springa-element-types/2308)
**Author:** [@mhayrettin](https://prepomax.discourse.group/u/mhayrettin)\ **Replies:** 3\ **Last updated:** [December 28, 2024, 3:29am UTC](https://prepomax.discourse.group/t/2-dof-mass-spring-system-spring2-springa-element-types/2308 "2024-12-28T03:29:01Z")
Hi, In the version I’m currently using (v2.1.11) SPRING2 and SPRINGA elements can not be added in the UI. And these are needed to connect two or more bodies/nodes/remote points not to the ground but to one another. @FEAn… --- ## [Steady state dynamics and structural damping](https://prepomax.discourse.group/t/steady-state-dynamics-and-structural-damping/2149)
**Author:** [@TKosir](https://prepomax.discourse.group/u/TKosir)\ **Replies:** 3\ **Last updated:** [November 6, 2024, 3:16pm UTC](https://prepomax.discourse.group/t/steady-state-dynamics-and-structural-damping/2149 "2024-11-06T15:16:33Z")
Greetings, When performing steady state dynamics (SSD) using structural damping in the material definition, and damping type “off” in the SSD step the simulations take way longer compared to just using constant damping … --- ## [Request for feedback - centrifugal fan - axial + radial forces](https://prepomax.discourse.group/t/request-for-feedback-centrifugal-fan-axial-radial-forces/2145)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 3\ **Last updated:** [November 5, 2024, 7:07pm UTC](https://prepomax.discourse.group/t/request-for-feedback-centrifugal-fan-axial-radial-forces/2145 "2024-11-05T19:07:12Z")
Hi All, Do we have a model in prepomax that helps us in calculating axial + radial force of a centrifugal fan?. --- ## [Request for feedback - motor shaft](https://prepomax.discourse.group/t/request-for-feedback-motor-shaft/2101)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 1\ **Last updated:** [October 23, 2024, 5:49am UTC](https://prepomax.discourse.group/t/request-for-feedback-motor-shaft/2101 "2024-10-23T05:49:33Z")
Dear All, Do you have a model built for calculating a motor shaft? Modal Analysis Harmonic & Frequency Response Plot Fatigue etc. --- ## [Motor side cap deformation](https://prepomax.discourse.group/t/motor-side-cap-deformation/2097)
**Author:** [@design](https://prepomax.discourse.group/u/design)\ **Replies:** 8\ **Last updated:** [October 22, 2024, 1:36pm UTC](https://prepomax.discourse.group/t/motor-side-cap-deformation/2097 "2024-10-22T13:36:13Z")
Dear All, We are designing a motor side cap for the electric motor. The model is attached (step file). We are planning to mount 6304 bearings. Radial load on the bearing is 2.4kN ( motor rpm ~10000) We want to unders… [Next page](https://prepomax.discourse.group/tag/dynamic/7.md?match_all_tags=true&page=1&tags%5B%5D=dynamic)