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Modulated sinusoidal excitation
Posted Mar 19, 2013, 4:58 a.m. EDT Structural Mechanics Version 4.2a 4 Replies
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I have to simulate a piezo transducer. The excitation of ceramics is a modulated sinusoidal excitation with an amplitude of 110V. In Piezdoelectric Devices module, I just can set a electric potential V0.
In definitions, I can create a sinusoidale function (without modulation), but I don't know if I should use it. I'm in frequency domain, and I would know how the frequency is used in the calculation.
Thanks for your help,
Quentin
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In Frequency Domain study, setting electric potential to V0 means that excitation voltage is sine function with frequency defined under Study Settings. So, you don’t need to create sine function for this case.
If you want to apply modulated sinusoidal excitation, then you have to use Time Dependent study.
Regards,
Sergei
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Ok for the Frequency Domain study. If I'm in Time Dependent study, I don't know how I can use a modulated sinusoidal excitation. Could you explain please?
Regards,
Quentin
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Under Definition>Variables, define modulated excitation voltage, for example
V0=A1*sin(2*pi*f1*t)+A2*sin(2*pi*f2*t)+…
Then, apply this voltage to PZT surface and use Time Dependent study. Make sure that time stepping is small enough to resolve excitation variation in time with sufficient accuracy.
Regards,
Sergei
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