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  • Users: sasank
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  1. sasank

    static stiffness testing of frame

    it is in btween a an SUV and Pick Up. The nuber I gave is an arbitrary number. I wnated to know, how to fix the vertical bending stiffness target? what is the theory or justification for fixing a particular target nuber. Regards sasank
  2. sasank

    static stiffness testing of frame

    Thanks for the information. But, I wnated to know, how do we get the individual bracketry stiffnesses measured during the test. What boundary conditions they use for testing. Also, another question is suppose if we want the bending stiffness of BIW or frame to be say around 4000 N/mm, what is...
  3. sasank

    static stiffness testing of frame

    Hallo! can anybody tell me how an automotive frame (SUV or pickup) tested for static stiffness? Can we simulate this in FEA? If so, what boundary conditions we have to use to get the FEA results close to real time testing. Regards sasank
  4. sasank

    Frequency response analysis using NASTRAN

    Greg Thanks for the reply. But, my question is can we validate this stiffness with some kind of test or theotically? Regards kamalakar
  5. sasank

    Frequency response analysis using NASTRAN

    Let me be more clear. My intention is to find the equivalent static stiffness at '0'Hz. displacements are my outputs from the analysis. (SOL111). I am finidng the static stiffness only without constraining the frame Regards Sasank
  6. sasank

    von mises stress vs maximum shear stress

    Hallo! all when we look at the stresses in a component, generally we ignore the stresses at the bolt hole locations. The reason for this is the way we model, the bolt hole(with RBE2's). My question is how do we judge the stresses around the bolt holes? In some cases we may not ignore them!!!
  7. sasank

    Frequency response analysis using NASTRAN

    Hallo! I am running point mobility to find out the '0' Hz equivalnet static stiffness of bracketry of a typical SUV frame.Calculating the deflections and from deflections calculating the stiffness. Aim is to find out the equivalent static stiffness in a free-free conditions. But, I do nothave...
  8. sasank

    Hi, can anybody expalin me what

    Hi, can anybody expalin me what is a flex mode in modal analysis? What is the significance of low frequency modes of an automotive frame/cradle? Thanks sasank
  9. sasank

    General Info on Spring Rates

    Hallo! Can any body explain me what is the bushing rate (refering to body mounts). How to decide how much bushing rate required. Thanks Sasank
  10. sasank

    Hallo! Can any body explain me w

    Thanks for the quick response.
  11. sasank

    Hallo! Can any body explain me w

    Hallo! Can any body explain me waht the following load cases stands for 1) 30 mph Chuckhole Vertical(Aft/Right) 2) Curb Island LF Vertical 3)Forward Wide Open Throttle 4)Forward Panic Bracking and 5) 73 degree SEPH LF Impact
  12. sasank

    Hallo! Can anybody explain me wh

    Hallo! Can anybody explain me what is Point Mobility ? and What is a Transfer function? What is the relation between these two ? The resons I am asking these questions are I have to run point mobility analysis for an engine mount bracket which is coming on to a cradle. Regards Sasank
  13. sasank

    mesh convergence

    Hallo! Can any body explain me how to check the mesh convergence. i.e, How we can decide whether the FE mesh of 100 or 200 elements will yield correct results? Is there any criteria to decide the number of elements in a FE Mesh
  14. sasank

    CONTACT ANALYSIS

    Hi, Can any body explain me or suggest me a web site on How to do the Conatct analysis? Any material available for an easy understanding about contacts. I wnated to do crash simulation of automotive frames. Sasank
  15. sasank

    Hallo! Can any body suggest me ,

    Thanks for the information Sasank
  16. sasank

    Hi, I have to do frequency respons

    Guys, Thanks for response. I have another question? If we look for acceleartion response, and plot the acceleartion Vs Frequency graph, How can we use this information? To be more clear, suppose if I get the peak response (acceleration ) in the rane of say 150-200 Hz, How this information can be...
  17. sasank

    Hallo! Can any body suggest me ,

    Hallo! Can any body suggest me , where I get some useful information about the Frequency Response Analysis of automotive frames and cradles. The information I need is How & why to do frequency response analysis? What output is required from this analysis? and How we can utilize this information...
  18. sasank

    Hi, I have to do frequency respons

    Thanks for the reply. I wanted to know some more information about frequency reposnse ana;ysis. To my knowledge, there are three methods in frequency response.They are 1) Displacement appraoch 2) Velocity approach 3) Acceleration approach My question is which of these approaches, we need to...
  19. sasank

    Hi, I have to do frequency respons

    Hi, I have to do frequency response analysis for automotive frames and cradles. Before starting the analysis I have some questions. Can any body please answer my questions? My questions. 1) What is frequency response analysis ? 2) what is Low frequency and High frequency responses. 3) When and...

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