Piezoelectric shunts for simultaneous vibration reduction and damping of multiple vibration modes
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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Abstract
A mechanical vibration control device includes a piezoelectric material having a pair of electrical leads extending therefrom, and a shunt circuit connected across the electrical leads of the piezoelectric material. The shunt circuit includes an energy dissipation circuit element having a dissipation element resistor, and a frequency tuning element inductor connected in parallel with the dissipation element resistor. To reduce and damp multiple vibrational modes, multiple shunt circuits are added in parallel. The various shunt circuits are isolated from each other with an isolator circuit element connected in series with each energy dissipation circuit element. The isolator circuit element includes an isolator element capacitor, and an isolator element inductor connected in parallel with the isolator element capacitor.
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Citations
12 Claims
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1. A mechanical vibration control device, comprising:
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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 comprising a first dissipation element resistor, and a first frequency tuning element inductor connected in parallel with the dissipation element resistor and a 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 including a second energy dissipation circuit element comprising a second dissipation element resistor, and a second frequency tuning element inductor connected in parallel with the second dissipation element resistor, and a 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. - View Dependent Claims (2, 3, 4)
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5. A mechanical vibration control device, comprising:
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a piezoelectric material having a pair of electrical leads extending therefrom; and a first shunt circuit connected across the electrical leads of the piezoelectric material, the first shunt circuit having a natural frequency of w2, the first shunt circuit including a first energy dissipation circuit element comprising a first dissipation element resistor, and a first frequency tuning element inductor connected in parallel with the first dissipation element resistor, and a first isolator circuit element connected in series with the first energy dissipation circuit element, the first isolator circuit element tuned to have an anti-resonant frequency of w1, the first isolator circuit element comprising a first isolator element capacitor, and a first isolator element inductor connected in parallel with the first isolation element capacitor 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 which is less than w2, the second shunt circuit including a second energy dissipation circuit element comprising a second dissipation element resistor, and a second frequency tuning element inductor connected in parallel with the second dissipation element resistor, and wherein said second shunt circuit is independent of an isolator circuit element such that only said first circuit element includes an isolator circuit element. - View Dependent Claims (6, 7)
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8. A mechanical vibration control device, comprising:
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a structural element having a mode of vibration with a natural frequency of w1 ; a piezoelectric material having a pair of electrical leads extending therefrom said piezoelectric material mounted to said structural element so as to damp the vibration of said structural element; and at least one shunt circuit connected across the electrical leads of the piezoelectric material, each shunt circuit including an energy dissipation circuit element comprising a dissipation element resistor, and a frequency tuning element inductor connected in parallel with the dissipation element resistor, and an isolator circuit element connected in series with the energy dissipation circuit element, the isolator circuit element comprising an isolator element capacitor, and an isolator element inductor connected in parallel with the isolation element capacitor, wherein at least one shunt circuit has a natural frequency of w1 so as to reduce and damp the mode of vibration of said structural member with a frequency of w1. - View Dependent Claims (9, 10, 11, 12)
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Specification
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Current AssigneeMcdonnell Douglas Corporation (The Boeing Co.)
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Original AssigneeMcdonnell Douglas Corporation (The Boeing Co.)
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InventorsWu, Shu-Yau
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Primary Examiner(s)Dougherty, Thomas M.
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Application NumberUS08/606,579Time in Patent Office876 DaysField of Search310/316, 310/317US Class Current310/316.01CPC Class CodesF16F 15/005 using electro- or magnetost...
