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how to model a spring?
Posted 2010年3月16日 GMT-4 11:23 1 Reply
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Hello everybody
I would like to create a model of a beam, fixed at one end and simply supported by a spring at the other (start point of a more complex structure), but I can find a way to accurately model mi spring.
Thank you in advance for your help!
I would like to create a model of a beam, fixed at one end and simply supported by a spring at the other (start point of a more complex structure), but I can find a way to accurately model mi spring.
Thank you in advance for your help!
1 Reply Last Post 2010年3月17日 GMT-4 04:37
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Posted:
1 decade ago
Hi
well a spring gives a force as Fy[N]=-ksp[N/m]*v[m] so you can, if you have a simple beam modelled by a line in 2D attach a force on the tip with the value "-ksp*v" (that you define as a constant) if the motion is in v, I assume your line is along x (horizontal).
And this should do, no ?
Perhaps you want to add some damping ? it's done in a smilar way. For eigenfrequency models you need to change theequation to allow it to be modal compatible. That is a good exercice.
You can easily check your model by adding a point mass at the end of your beam.
For modal analysis it would show you the way one calibrates an accelerometer by doing a simple modal sweep test on a structure, and then by reapeqating with adding a known mass on the accelerometer
Good luck
Ivar
well a spring gives a force as Fy[N]=-ksp[N/m]*v[m] so you can, if you have a simple beam modelled by a line in 2D attach a force on the tip with the value "-ksp*v" (that you define as a constant) if the motion is in v, I assume your line is along x (horizontal).
And this should do, no ?
Perhaps you want to add some damping ? it's done in a smilar way. For eigenfrequency models you need to change theequation to allow it to be modal compatible. That is a good exercice.
You can easily check your model by adding a point mass at the end of your beam.
For modal analysis it would show you the way one calibrates an accelerometer by doing a simple modal sweep test on a structure, and then by reapeqating with adding a known mass on the accelerometer
Good luck
Ivar