PIEZOELECTRIC RESONATORS FOR REDUCTION OF NOISE AND VIBRATION IN VEHICLE COMPONENTS
Disclosed herein is a piezoelectric resonator for damping noise from a vehicle component. The piezoelectric resonator includes a first piezoceramic material having a first electrode, the first piezoceramic material disposed at a first location on one side of the vehicle component and a second piezoceramic material having a second electrode, the second piezoceramic material disposed at a second location on an opposing side of the vehicle component, wherein the first location is opposite the second location. The piezoelectric resonator also includes a shunt circuit comprising a resistor and an inductor, the shunt circuit connected to the first electrode and the second electrode in series. The shunt circuit is configured to dissipate energy from vibration experienced by the vehicle component.
1 . A method for reducing noise and vibration in a vehicle component comprises:
affixing a first piezoceramic material to a location on one side of the vehicle component;
affixing a second piezoceramic material to the location on an opposing side of the vehicle component; and
connecting the first and second piezoceramic material in series to a shunt circuit having a resistor and an inductor;
wherein the shunt circuit is configured to dissipate energy from vibration experienced by the vehicle component.
2 . The method of claim 1 , wherein the inductor is a synthetic inductor comprising an operational amplifier and a variable resistor.
3 . The method of claim 1 , further comprising calculating an optimal inductance and an optimal resistance based on the properties of the first and second piezoelectric materials, a measured open circuit frequency, and a measured short frequency.
4 . The method of claim 3 , wherein the resistor has a value of the optimal resistance and the inductor has a value of the optimal inductance.
5 . The method of claim 1 , wherein the location is selected to be a portion of the vehicle component that experiences a strain.
6 . The method of claim 5 , wherein the portion of the vehicle component is determined by finite element simulation.
7 . A piezoelectric resonator for damping noise from a vehicle component comprising:
a first piezoceramic material having a first electrode, the first piezoceramic material disposed at a first location on one side of the vehicle component;
a second piezoceramic material having a second electrode, the second piezoceramic material disposed at a second location on an opposing side of the vehicle component, wherein the first location is opposite the second location; and
a shunt circuit comprising a resistor and an inductor, the shunt circuit connected to the first electrode and the second electrode in series;
wherein the shunt circuit is configured to dissipate energy from vibration experienced by the vehicle component.
8 . The piezoelectric resonator of claim 7 , wherein the inductor is a synthetic inductor comprising an operational amplifier and a variable resistor.
9 . The piezoelectric resonator of claim 7 , wherein an optimal inductance and an optimal resistance are calculated based on the properties of the first and second piezoelectric materials, a measured open circuit frequency, and a measured short frequency.
10 . The piezoelectric resonator of claim 9 , wherein the resistor has a value of the optimal resistance and the inductor has a value of the optimal inductance.
11 . The piezoelectric resonator of claim 7 , wherein the first location is selected to be a portion of the vehicle component that experiences a strain.
12 . The piezoelectric resonator of claim 11 , wherein the portion of the vehicle component is determined by finite element simulation.
13 . A piezoelectric resonator for damping noise from a vehicle component comprising:
a first piezoceramic material having a first electrode, the first piezoceramic material disposed at a first location on one side of the vehicle component that experiences a strain;
a second piezoceramic material having a second electrode, the second piezoceramic material disposed at a second location on an opposing side of the vehicle component, wherein the first location is opposite the second location; and
a shunt circuit comprising a resistor and an active inductor, the shunt circuit connected to the first electrode and the second electrode in series;
the active inductor comprising a plurality of resistors, an operational amplifier, a capacitor and a variable resistor, wherein an inductance of the active inductor is adjustable by adjusting the variable resistor;
wherein the shunt circuit is configured to dissipate energy from vibration experienced by the vehicle component.
14 . The piezoelectric resonator of claim 13 , wherein an optimal inductance and an optimal resistance are calculated based on the properties of the first and second piezoelectric materials, a measured open circuit frequency, and a measured short frequency.
15 . The piezoelectric resonator of claim 14 , wherein the resistor has a value of the optimal resistance and the inductor has a value of the optimal inductance.
16 . The piezoelectric resonator of claim 13 , wherein the first location on the vehicle component is determined by finite element simulation.