Dear all,
I am testing the natural frequency and damping ratio of my stage and compare them with the FEA result. I know there is frequency analysis, however, I do not know that there is similar function that could get the damping ratio. Could anyone tell me how to use SW to simulate the damping ratio?
Thanks
best
No. Its an input.
probably worth taking a look at this: http://help.solidworks.com/2013/English/SolidWorks/cworks/c_Damping_Effects.htm?id=b9167321d37e479888253b8b28f9a4f2#Pg0
I'm not actually sure if there are simulation tools that understand the physical make-up of a material such that it can predict it's damping characteristics.
Werther,
I suspect that the best you can do is to try several different values of the damping ratio in your simulations and then adjust the value until you get a result that matches well enough to your test results.
Jerry S.
if you can do testing, another option would be to determine the damping from the testing and use it to validate the simulation and use it for future simulations
I did a bunch of dynamic analysis in school. We used physical testing to back out the damping ratio using accelerometers and the "log-dec" method. However, the higher modes are harder to excite and thus harder to measure.
Do you have a similar physical structure you can perform testing on?
I have seen many users assume a modal damping of 0.02-0.05 for each mode. How precise your damping really depends on the results that you're interested in from your linear dynamic analysis.
Brian
I have similar structure and I can test the damping ratio of some parts, but I can not get the damping ratio of all parts.
I do appriciate your answer!
Thanks
best
Thanks!
if you can do testing, another option would be to determine the damping from the testing and use it to validate the simulation and use it for future simulations