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Determining resonant frequency
Posted 2013年2月28日 GMT-5 15:01 Version 4.2 1 Reply
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When trying to determine resonant frequencies of a piezoelectric transducer how would you go about that using the frequency domain study?
1 Reply Last Post 2013年2月28日 GMT-5 15:11
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Posted:
1 decade ago
Hi
My suggestion is that you start with an eigenfrequency solver, to get the frequencies of the different main modes,
Thenyou run a frequency sweep, as you need to give a range for the frequency steps, and you must make these steps smaller around the resonances to catch them correctly.
I mostly use logarithmic ranges of the type 10^range(-2,1,4) or whatever fits, but then I combine several "range()" step rapidly up to -5% (below) the eigenfrequency andthen by step regularly up to +5% (above) the eigenfrequencies, then rapid steps again to next mode etc
If you have some damping its worth to plot real and imag part or amplitude and phase (and I usually plot in log scale or even log-log scale
--
Good luck
Ivar
My suggestion is that you start with an eigenfrequency solver, to get the frequencies of the different main modes,
Thenyou run a frequency sweep, as you need to give a range for the frequency steps, and you must make these steps smaller around the resonances to catch them correctly.
I mostly use logarithmic ranges of the type 10^range(-2,1,4) or whatever fits, but then I combine several "range()" step rapidly up to -5% (below) the eigenfrequency andthen by step regularly up to +5% (above) the eigenfrequencies, then rapid steps again to next mode etc
If you have some damping its worth to plot real and imag part or amplitude and phase (and I usually plot in log scale or even log-log scale
--
Good luck
Ivar