Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
how to model a spring?
Posted Mar 16, 2010, 11:23 a.m. EDT 1 Reply
Please login with a confirmed email address before reporting spam
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 Mar 17, 2010, 4:37 a.m. EDT
Please login with a confirmed email address before reporting spam
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