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Piezoelectric shunts for simultaneous vibration reduction and damping of multiple vibration modes

  • US 5,783,898 A
  • Filed: 02/26/1996
  • Issued: 07/21/1998
  • Est. Priority Date: 02/26/1996
  • Status: Expired due to Fees
First Claim
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1. A mechanical vibration control device, comprising:

  • a piezoelectric material for damping mechanical vibrations in a structure having at least two vibrational modes with natural frequencies of w1 and w2, said piezoelectric material having a pair of electrical leads extending therefrom;

    a first shunt circuit connected across the electrical leads of the piezoelectric material, the first shunt circuit having a natural frequency of w2 such that the first shunt circuit damps vibrations having a natural frequency of w2, the first shunt circuit including a first energy dissipation circuit element comprisinga first dissipation element resistor, anda first frequency tuning element inductor connected in parallel with the dissipation element resistor anda first isolator circuit element connected in series with the first energy dissipation circuit element, wherein the first isolator circuit element is tuned to have an anti-resonant frequency of w1 ; and

    a second shunt circuit connected across the electrical leads of the piezoelectric material in parallel with the first shunt circuit, the second shunt circuit having a natural frequency of w1 such that the second shunt circuit damps vibrations having a natural frequency of w1, the second shunt circuit includinga second energy dissipation circuit element comprisinga second dissipation element resistor, anda second frequency tuning element inductor connected in parallel with the second dissipation element resistor, anda second isolator circuit element connected in series with the second energy dissipation circuit element, wherein the second isolator circuit element is tuned to have an anti-resonant frequency of w2.

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