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  1. caemagic

    Dynamic Stiffness and static stiffness in metals

    Dear electricpete , Thank you so much for your reply , I would like to ask whether dynamic stiffness term may have a different meaning , I thought that the dynamic stiffness obtained from the FRF (as greg said) is the theoretical dynamic stiffness? what is the difference between dynamic...
  2. caemagic

    Dynamic Stiffness and static stiffness in metals

    Thnx greg :)
  3. caemagic

    Is this possible ?

    HEy guys , Let's I have an SDOF system , and I would like to know thw dynamic stiffness of this system , is the FRF enough ? , how to compute dynamic stiffness from FRF ? Thank you caemagic
  4. caemagic

    Dynamic Stiffness and static stiffness in metals

    Hello , I would like to know whether it is safe to assume that static and dynamic stiffness in metals can be assumed to be the same. Metals , in general have very little damping ,hence both static and dynamic stiffness should not differ am I correct ? Thank you caemagic
  5. caemagic

    Brazed Joints in Sol 103

    Hey guys I would like to ask you on how to model brazed joints in SOL 103 , what would be the best practice for modeling such a joint , is it possible to model them via RBE2/RBE3 Thank you caemagic
  6. caemagic

    Modeling Tuned Mass damper in NX Nastran

    Dear Guys Thank you so much for your reply , it is so exciting for to share knowledge. Please refer to the attachment for further detail of the problem , I have a machine which has a vibration problem , i add these visco-elastic materials, rubber. by trial and error , I reduce the response...
  7. caemagic

    Displacement in forced vibration

    Hi Mandar In vibration simulation , almost any software would require you to carryout a modal analysis first , hence u should extract the eigenvalues of the ur structure first , then proceed to any other analysis including transient analysis , hope that helped caemagic
  8. caemagic

    Modeling Tuned Mass damper in NX Nastran

    Dear rob Thank you so much for your reply , I have a visco-elastic tuned mass damper in a structure which I would like to model , since the mass added is rubber , hence there's some damping , if an equivalent in terms of springs, dampers and mass to be made , how do we model it ?
  9. caemagic

    Modeling Tuned Mass damper in NX Nastran

    any body has an idea on how to a viscoelastic tuned mass damper on Nastran Thank you cae magic
  10. caemagic

    Modeling Tuned Mass damper in NX Nastran

    any body has an idea on how to a viscoelastic tuned mass damper on Nastran Thank you cae magic
  11. caemagic

    Rubber Modeling

    Hey guys , I would like to know some information on how to model rubber for SOL 103 Thank you caemagic
  12. caemagic

    CQUAD4 and CQUAD 8

    Dear Blas , this was very helpful , thank you so much :)
  13. caemagic

    Dealing with subsystems

    Hey guys , I would like to know how to deal with subsystems? , I am interested in the vibration of a structure , let's say I am interested in the vibrations of a car engine mounted on rubber bushing, how do I constrain the engine in such a way that the behavior of the engine as a subsystem...
  14. caemagic

    CQUAD4 and CQUAD 8

    Hey guys , I would like to know the difference between these two elements , as a guideline it's preferable to use CQUAD8 , do we always use CQUAD8 when ever we mesh and analyse ? thank you caemagic
  15. caemagic

    Dealing with subsystems

    Hey guys , I would like to know how to deal with subsystems? , I am interested in the vibration of a structure , let's say I am interested in the vibrations of a car engine mounted on rubber bushing, how do I constrain the engine in such a way that the behavior of the engine as a subsystem...
  16. caemagic

    Excitation point

    thank you so much Blas!
  17. caemagic

    material damping

    Hi hisham , If the system you have is a a single degree of freedom , then u may know the damping coffceint using the following formula , C=gamma*(sqrt(m*k)), that's all caemagic
  18. caemagic

    Excitation point

    Please check the attachment for more details
  19. caemagic

    Excitation point

    Hey guys , I would like to know where exactly shall I place the point of excitations? I have placed the excitation at a point that's level to the base of the spring. And that point is connected via RBE2 elements , is this a correct practice , please do shed some light on this Thank you so...
  20. caemagic

    Base-excitation modeling

    Dear Blas Thank you so much , it worked

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