Active noise control using piezoelectric sensors and actuators
First Claim
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1. A method for reducing noise generated by the operation of a noise-producing machine comprising:
- sensing the noise of the machine with a piezoelectric sensor;
sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine, where the piezoelectric actuator is independent of a wave guide;
sensing a parameter of the machine indicative of the speed of the machine with a second sensor; and
correcting the activation signal, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material.
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Abstract
A method for reducing noise generated by the operation of a noise-producing machine includes sensing the noise of the machine with a piezoelectric sensor, sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine, where the piezoelectric actuator is independent of a wave guide. Further, a parameter of the machine indicative of the speed of the machine is sensed with a second sensor, and the activation signal is corrected, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material.
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Citations
20 Claims
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1. A method for reducing noise generated by the operation of a noise-producing machine comprising:
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sensing the noise of the machine with a piezoelectric sensor; sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine, where the piezoelectric actuator is independent of a wave guide; sensing a parameter of the machine indicative of the speed of the machine with a second sensor; and correcting the activation signal, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for reducing noise generated by the operation of a noise-producing machine, where the machine produces periodic noise bursts, comprising:
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sensing the noise of the machine with a piezoelectric sensor; sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine; sensing a parameter of the machine indicative of the frequency of the noise bursts with a second sensor; and correcting the activation signal, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for reducing noise generated by the operation of a noise-producing machine, where the machine causes periodic impacts of one element against another, thereby producing periodic noise bursts, comprising:
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sensing the noise of the machine with a piezoelectric sensor; sending an activation signal, responsive to the sensed noise of the machine, to activate a piezoelectric actuator to reduce the noise of the machine; sensing the frequency of the impacts with a second sensor; and correcting the activation signal, responsive to the sensed parameter of the machine, to optimize the noise reduction of the piezoelectric material. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification