May 16, 2018 at 5:49 pmsimon_prSubscriber
Currently I am working the harmonic analyse of a canteliver beam with Ansys workbench.
With a point for the load and another for the measurement, I got the FrF of the linear acceleration. However I would like to find how to measure rotational acceleration (or velocity). I can not choose rotational parameter in the tab to draw a frequency reponse fonction, it only offers linear parameters like acceleration or velocity. I did fine tutorial or topic useful.. If you have any advice, it would be very kindly !
Thanks in advance,
May 16, 2018 at 9:42 pmsk_cheahSubscriber
If you have solid elements, rotation degrees of freedom is not available. If you are you using shell elements, you could use User Defined Results with RZ being rotation in the Z axis.
May 16, 2018 at 11:31 pmpeteroznewmanSubscriber
Vibration analysis is based on small deflections. When deflections are small, rotations are vanishingly small. I advise not looking at rotational deformations.
For a large deflection nonlinear Transient Structural model, finite rotations are worth looking at and Jason has provided some guidance on how to do that. In addition, on a solid model, there is a Flexible Rotation probe available.
May 17, 2018 at 12:40 am
May 17, 2018 at 4:16 am
May 17, 2018 at 2:30 pmsimon_prSubscriber
Hi Peter and Jason,
Thank you for your answers.
I agree that deflections could be small, but I am rather looking for angular accelerations which are larger (experimentally I have 30 ° / s², so measurable I think). Also I do not understand why it is possible to measure a normal acceleration that may be smaller than an angular acceleration (on vibration nodes for example).
I will try with the shell elements, in addition it is more suitable for my geometry. Thanks
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