Vibrating rod
Vibrating rod
(OP)
Dear all,
How do you measure the vibration pattern and amplidute of a vibrating rod ( S - shape). It is 1x1 (cm) and 1.5 m long. The vibration is fixed at 35kHz.
thanking you for your time.
mech.design-eng
How do you measure the vibration pattern and amplidute of a vibrating rod ( S - shape). It is 1x1 (cm) and 1.5 m long. The vibration is fixed at 35kHz.
thanking you for your time.
mech.design-eng





RE: Vibrating rod
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for example, if you did get the frequency wrong.
Failing that you could use laser holgraphy.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Vibrating rod
RE: Vibrating rod
RE: Vibrating rod
Thanks for those giving response. The beam is used for vibrating a thin metal surface. The Transducer fixed on one end is giving the vibration to rod and we don't know whether the 35kHz vibration is passed on to the s-shaped beam. both ends are not fixed and it is only supported on the nodes. ( we believe they are nodes!)
At least, we wanted to know the rms value of the resonance.
thanks.
RE: Vibrating rod
RE: Vibrating rod
Mecheng.
RE: Vibrating rod
For extensional(longitudinal) modes, impact is on the end of the rod. For torsional and flexural modes, projecting lugs attached to the drive end are impacted while the detector electrode is mounted vertically over a similar lug at the same or other end of the specimen. In the frequency amplitude spectra, extensional and torsional harmonic peaks will be evenly spaced while flexural mode harmonics will be unequally spaced.
How do you know where the nodes in the S-shaped beam are located for support locations if you don't know what modes will be excited? For the shape-shaped beam, I would suspect that a complex combination of extensional, torsional and flexural modes may be excited simultaneously.