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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...

Thnx greg :)

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

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

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

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...

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

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 ?

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

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

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

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

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...

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

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...

thank you so much Blas!

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

Please check the attachment for more details

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...

Dear Blas Thank you so much , it worked