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mpvnaresh

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About mpvnaresh

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  1. Sir Thanks for the information. I dont have Simlab with me. all i need to simulated with is only with optistruct . So It could be helpful if any thing related to bearing modeling using 0D elements like (CELAS and CDAMP elements) is shared. How to define radial stiffness and axial stiffness of a beareing with CELAS and CDAMP elements Thanks for the support and knowledge sharing .
  2. Sir Thanks for the reply. I understand you were talking abut Rotor dynamics . My objective is to analyse a motor under dynamic loads (Structural transient dynamics).Right now i dont bother about rotor dynamics. I need to simulate the stiffness of the bearing as it carries the vibration load from the body of the motor to the rotor (or shaft). note: The vibration load is applied to the body of the motor at mounting locations as a base exciting acceleration.
  3. Sir Many thanks for the clues.i am modeling a bearing which is supposed to take radial loads and axial loads as well. How can i define both the radial stiffness and axial stiffness ? Is it by defining the nodes of the CELAS element in acylindrical CSYS? Please guide me. If any example for bearing modeling using CELAS is available .Please share.
  4. Sir I am having the same issue ..but the saft is to be connected to its housing via bearing ..i dont want to model full bearing (to avoid the number of contacts) so hoe can i connect the shaft with housing with any other elements.
  5. Hi I need to simulate a bearing in Optistruct RotorDynamics. We have a PBEAR element in NX NASTRAN for that .Do we have a similar kind of element in Optistruct . If not how to simulate a bearing in Optistruct .
  6. What my point is ..does this phenomenon depends on the fillet radius ....because for larger radiys (2 mm 0r 3mm )the stress converging to a value.but for small radius fillets(0.5 mm) its not happening ..where actually i cant go for more than 1 mm fillet radius in my physical model.
  7. Thanks for the information, up to what values CONTACT STAB values are allowed for a good converged solution. ? In my case initially they are statting from zero to twenty five percent up to first 5 to 6 increments ..then after going down to and reaching zero (almost zero 0.00005%)by around the 40 % or 50 % of the load is reached and that zero continues till the solution ends .
  8. If the radius is increased i m getting a converged solution , for 0.5 mm the stress going up wit number of elements on fillet.
  9. sorry sir , I cant share the model because of security issues.
  10. Hi I am doing a simple stress analysis because temperature rise. I have given TREF in MAT1 and TEMP applied by TEMP_LOAD. I am getting high stresses in a fillet area ,which is the expected location. But the value keep on increasing with more refinement in area ...(4 , 8 , 12 elements on fillet,fillet radius is 0.5 mm) So please help me in which values i have to take ...(number of elements on fillet)
  11. Hi I am running a nonlinear quastatic analyssis Run no 1 : only with RFORCE (converged very smoothly) Run no 2:along with RFORCE temp load is also added (TREF and A desined on MAT1 , very smooth convergence ) Run no 3: only TEMP Load(converfed very smoth 98.5 % from then lot of iterations and lot of cutbacks ) Now the question is the FEA model is same for all the models only thing varied is RFORE deactivated ..why it is struggling to converge at the very last load step ..? please find the the attached for reference thermals_alone.out
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