modal analysis of an oscillator with non uniform stiffness in tension/compression
modal analysis of an oscillator with non uniform stiffness in tension/compression
(OP)
I am trying to find the fundamental period of a special oscillator which consists of a mass attached to a spring that has stiffness k1 in compression but stiffness k2 in tension.
Is there any way to model this behavior in Finite Elements Method?
I can not even think of a hand solution. Can anyone help me with an idea how to calculate manually or through FEM?
Is there any way to model this behavior in Finite Elements Method?
I can not even think of a hand solution. Can anyone help me with an idea how to calculate manually or through FEM?





RE: modal analysis of an oscillator with non uniform stiffness in tension/compression
pi * [sqrt(m/k1) + sqrt(m/k2)]
Or have I missed something?
RE: modal analysis of an oscillator with non uniform stiffness in tension/compression
There are many programs that could be used to model this, but linear FEA is not one of them. You need a time domain simulation. I'd suggest Matlab would be most instructive, but you could use simulink, adams, motionview, dymola, excel etc etc.
Cheers
Greg Locock
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RE: modal analysis of an oscillator with non uniform stiffness in tension/compression
RE: modal analysis of an oscillator with non uniform stiffness in tension/compression
I am not disagreeing with you, but my first instinct would be to give the mass an initial displacment and let it go. Do you think there is an issues with this approach?
RE: modal analysis of an oscillator with non uniform stiffness in tension/compression
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: modal analysis of an oscillator with non uniform stiffness in tension/compression