Frequency-focused actuators for active vibrational energy control systems
First Claim
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1. An active vibration control system for controlling vibrational energy within an enclosure such as an aircraft cabin, an automobile passenger compartment, and the like, said system being capable of a broadened control and comprising:
- a) reference sensor means for monitoring a disturbance to be controlled, said disturbance having various spectral frequencies contained therein, said reference sensor means producing a reference signal which corresponds to said disturbance;
b) first frequency-focused structural actuator means for producing a low-frequency vibrational control signal reducing at least a first portion of said disturbance by interfering with some of said various spectral frequencies;
c) second frequency-focused acoustic actuator means within said enclosure for producing a higher-frequency acoustic control signal canceling at least a second portion of said disturbance by interfering with other of said various spectral frequencies;
d) an adaptive controller including adaptive filter means for processing said reference signal and producing at least two actuator command signals, one each to said first frequency-focused structural actuator means and said second frequency-focused acoustic actuator means, which are of appropriate frequency and magnitude to activate a respective said actuator means;
e) error sensor means for sensing a residual signal resulting from combining said low-frequency vibrational control signal and said higher-frequency acoustic control signals with said disturbance, andf) circuitry means for feeding said residual signal back to said adaptive filter means to make adjustments in said at least two actuator command signals.
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Abstract
Actuators for active vibrational energy control systems which are frequency focused. The high-frequency cancellation function is decoupled from the low-frequency cancellation function to enable the size, force, number and placement of the actuators to be optimized. A hybrid system employing structural actuators to cancel low-frequency vibrations and speakers to cancel higher-frequency vibrations is also taught.
68 Citations
18 Claims
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1. An active vibration control system for controlling vibrational energy within an enclosure such as an aircraft cabin, an automobile passenger compartment, and the like, said system being capable of a broadened control and comprising:
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a) reference sensor means for monitoring a disturbance to be controlled, said disturbance having various spectral frequencies contained therein, said reference sensor means producing a reference signal which corresponds to said disturbance; b) first frequency-focused structural actuator means for producing a low-frequency vibrational control signal reducing at least a first portion of said disturbance by interfering with some of said various spectral frequencies; c) second frequency-focused acoustic actuator means within said enclosure for producing a higher-frequency acoustic control signal canceling at least a second portion of said disturbance by interfering with other of said various spectral frequencies; d) an adaptive controller including adaptive filter means for processing said reference signal and producing at least two actuator command signals, one each to said first frequency-focused structural actuator means and said second frequency-focused acoustic actuator means, which are of appropriate frequency and magnitude to activate a respective said actuator means; e) error sensor means for sensing a residual signal resulting from combining said low-frequency vibrational control signal and said higher-frequency acoustic control signals with said disturbance, and f) circuitry means for feeding said residual signal back to said adaptive filter means to make adjustments in said at least two actuator command signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An active control system for controlling vibrational energy within an enclosure such as an aircraft cabin, an automobile passenger compartment, and the like, said system comprising:
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a) reference sensor means for monitoring a disturbance to be controlled , said disturbance having various spectral frequencies contained therein, said reference sensor means producing a reference signal which corresponds to said disturbance; b) first frequency-focused structural actuator means for producing a first cancelling signal reducing at least a first portion of said disturbance by interfering with some of said various spectral frequencies which are directly coupled to structural vibration of said enclosure; c) second frequency-focused acoustic actuator means for producing a second cancellation signal canceling at least a second portion of said disturbance by interfering with other of said various spectral frequencies which are uncoupled to structural vibration of said enclosure; d) an adaptive controller including adaptive filter means for processing said reference signal and producing at least two actuator command signals, one each to said first frequency-focused structural actuator means and second frequency-focused acoustic actuator means, which are of appropriate frequency and magnitude to activate a respective said actuator means; e) error sensor means for sensing a residual signal resulting from combining said first cancellation signal and said second cancellation signal with said disturbance, and f) circuitry means for feeding said residual signal back to said adaptive filter means to make adjustments in said at least two actuator command signals.
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16. An active control system for controlling a disturbance generated by and aircraft engine various spectral frequencies including an N1 frequency range and a higher N2 frequency range emerging within an enclosure such as an aircraft cabin, said system comprising:
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a) reference sensor means for monitoring said disturbance to be controlled and producing a reference signal which corresponds to said disturbance; b) first frequency-focused structural actuator means for producing a first cancelling signal within said N1 frequency range reducing at least a first portion of said disturbance by interfering with some of said various spectral frequencies that are within said N1 frequency range; c) second frequency-focused structural actuator means for producing a second cancelling signal within said N2 frequency range reducing at least a second portion of said disturbance by interfering with some of said various spectral frequencies that are within said N2 frequency range; d) an adaptive controller including adaptive filter means for processing said reference signal and producing at least two actuator command signals, one each to said first frequency-focused structural actuator means and said second frequency-focused structural actuator means, which are of appropriate frequency and magnitude to activate a respective said actuator means; e) error sensor means for sensing a residual signal resulting from combining said first cancellation signal, said second cancellation signal, and said disturbance, and f) circuitry means for feeding said residual signal back to said adaptive filter means to make adaptations in said at least two actuator command signals. - View Dependent Claims (17)
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18. An active vibration control system for controlling vibrational energy within an enclosure such as an aircraft cabin, an automobile passenger compartment, and the like, said system being capable of a broadened control and comprising:
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a) reference sensor means for monitoring a disturbance to be controlled, said disturbance having various spectral frequencies contained therein, said reference sensor means producing a reference signal which corresponds to said disturbance; b) frequency-focused structural actuator means for producing a vibrational control signal within a first frequency range reducing at least a first portion of said disturbance by interfering with some of said various spectral frequencies; c) frequency-focused acoustic actuator means within said enclosure for producing an acoustic control signal within a second frequency range canceling at least a second portion of said disturbance by interfering with other of said various spectral frequencies; d) a controller including adaptive filter means for processing said reference signal and producing at least two actuator command signals, one each to said frequency-focused structural actuator means and said frequency-focused acoustic actuator means, which are of appropriate frequency and magnitude to activate a respective said actuator means; e) error sensor means for sensing a residual signal resulting from combining said vibrational control signal and said acoustic control signals with said disturbance, and f) circuitry means for feeding said residual signal back to said adaptive filter means to make adjustments in said at least two actuator command signals.
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Specification