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Found 17 results

  1. I am trying to simulate the influence of an unbalanced tyre on the structure using an FRF. Because it is rotating in the XZ-plane I have made two inputs, one excitation in X and one in Z. I combine these inputs in a DLOAD through 2 RLOAD load collectors. The thing I am struggling with is implying a 90 degree phase delay for one of the 2 RLOAD collectors. I have expirimented with the delay option and dphase option but I have not obtained the result I wanted. How do I apply this delay in my model? Is there a tutorial for this?
  2. Hello everyone, A frequency response analysis was done, and I want to get the reaction force frequency response at the SPC nodes. The following control cards were used. However, I cannot get the reaction force frequency response. FORMAT OPTI FORMAT H3D OUTPUT,HGFREQ,ALL SPCFORCE(H3D,REAL) = 1 Which output control should be used to get the reaction force frequency response?
  3. Hi, I would perform an Impact Hammer Test on a panel and plot acceleration in some points of that. I don't know if i'm right following the frequency response tutorial (i'm not sure if use modal or direct method), so i have 2 question: 1. How can i model (if possible) the load as an impulse? 2. I have the damping loss factor function the frequency of the material. How can I input this on the model? Thanks for answering.
  4. Hello Everyone! I am doing a response spectrum analysis an like to retrieve a eigenvalues and vectors from normal modes analysis which has already done. I hav saved the eigen value using EIGVNAME = modes and EIGVSAVE = 100. The file is has saved as modes.100.eigv. While doing RSPEC, I retreived the eigv using EIGVRETRIEVE = 100 and same EIGVNAME. But Solving throws an error as, *** ERROR # 372 *** Number of MPC constraints in file modes.100.eigv 474 does not match current value 0. Can Someone figure it out . Thanks in Advance -RathinaVel
  5. want to perform frequency response analysis of a component with the Base excitation of 1g over 10 to 1000Hz, Damping 1% over 10 to 1000Hz. How can get the damping?
  6. Hi, I need to carry out frequency response analysis with operating speed. There is no force and I have only speed in rpm as input. How to specify this in Optistruct instead of using SPCD/DAREA card?
  7. want to perform frequency response analysis of a component with the Base excitation of 1g over 10 to 1000Hz, Damping 1% over 10 to 1000Hz. How can get the damping?
  8. Hi, I'm doing a frequency response analysis (NASTRAN SOL 111) asking stress in both plate and solid elements. The concern is that when I plot Von Mises conour in Hyperview, the calculated value derive only from the combination of the real part of the stress tensor components and not from the magnitude ones. Moreover I am not able to plot corner results in plate elements, but only in solid ones. Why? Can someone help me? Thanks!
  9. Hi, What is the significance or reason of plotting input curve and output response curve in same plot in Frequency response analysis ?
  10. Hi, does Hypermesh use a default damping factor for harmonic analysis if I don't manually set one? I need to compare another frequency response without damping and I need to know if the response obtained with Optistruct has or hasn't damping in it. Thank you
  11. I am new to frequnecy response analysis and have some queries regrding the same 1. I referred the OS- 1300 module for frquency response and I am not sure about how the values of COUPMASS and WTMASS was taken. 2. I want to apply the base excitation of 1g to my model. How can I do that? 3. In the tutorial the DAREA is applied and dof3 is given value of 20. Does that mean the application of frequnecy with amplitude 20? 4. How can I give the damping of 1% to my system? Thank You.
  12. Hi , Can anyone explain how to calculate / Plot dynamic stiffness from frequency response analysis in Optistruct?
  13. Hi, What is the significance or reason of plotting Gin (PSD) curve and Gout ( Response) curve in same plot in Random response analysis ? Is there any theory behinds?
  14. Hello, First of all i want to explain what i did so far. I performed a frequency response modal Analysis to investigate the dynamic stiffness of my component in Hypermesh/Optistruct. I performed an Analysis with Optistruct and my results are the frequency-depended Displacement (s) and SPC-Force (F). Then i plotted the dynamic stiffness by calculating Cdyn=F/s. The results are exactly what i expected. After that i changed the structure of my component using Mesh Morphing and recalculated the dynamic stiffness of the changed component. This had a huge effect on the dynamic stiffness. I saved the morph-changes as shapes and created a shape design variable. I want to do a shape optimization to reduce (minimize) the dynamic stiffness. Now my questions: 1. Is it possible to do a shape-optimization to reduce the dynamic stiffness (reduce the quotient F/s) with optistruct? 2. When it is possible, can you give me a hint, how i have to proceed with the Responses, constraints and objectives for the optimization? Regards, Fatih Uysal
  15. Hi I am performing a modal frequency response analysis with OptiStruct. The model I have gives the displacement as output. However, I am interested in the acceleration as output. I tried obtaining this by checking the acceleration box under load steps => load case => subcase options output, but I could not access the acceleration result when in hyperview. Am I missing something? I can calculate the acceleration from the displacements but I feel like I should be able to get the acceleration results directly from the model. Thx
  16. Hi, What is the significance or reason of plotting Gin (PSD) curve and Gout ( Response) curve in same plot in Random response analysis ? Is there any theory behinds?
  17. Dear All, I have a structure for which i have carried out frequency response analysis using Hypermesh as preprocessor and NASTRAN as solver. I have the following queries: 1) In the .f06 output file, the principal stresses are not printed. 2) I have used hex hedral meshing for the entire structure. After carrying out the meshing and frequency response analysis only Normal shear stress are printed. When i use the formula(see attachment) to calculate 3d principal stresses, at some points, i am unable to calculate the angle due to incorrect value? Is this due to inaccurate meshing? Please advise.
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