Apparatus and method for the active control of air moving device noise
First Claim
Patent Images
1. Apparatus for the control of noise generated by rotating machinery comprising:
- at least one error sensor;
means for sensing motion;
a control circuit for receiving signals from the error sensor and the motion sensing means, which control circuit develops an actuator signal;
an actuator attached to a motor shaft, which receives the actuator signal from the control circuit and transforms it into mechanical motion causing rotating machinery attached to the actuator to move along an axis; and
a slip ring which receives the actuator signal from the control circuit and which connects said signal to the actuator.
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Abstract
Method and apparatus for the active cancellation of broad band noise and/or single frequency tones emanating from rotating machinery, such as an air moving device, by detecting related mechanical and acoustic signals therein and causing canceling vibrations to be applied directly to the rotating machinery by a transducer.
59 Citations
63 Claims
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1. Apparatus for the control of noise generated by rotating machinery comprising:
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at least one error sensor; means for sensing motion; a control circuit for receiving signals from the error sensor and the motion sensing means, which control circuit develops an actuator signal; an actuator attached to a motor shaft, which receives the actuator signal from the control circuit and transforms it into mechanical motion causing rotating machinery attached to the actuator to move along an axis; and a slip ring which receives the actuator signal from the control circuit and which connects said signal to the actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for the control of noise generated by an air moving device comprising:
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at least one microphone; a tachometer; a control circuit for receiving signals from the microphone and the tachometer, which control circuit develops an actuator signal; a piezoelectric actuator attached to a motor shaft, which receives the actuator signal from the control circuit and transforms it into mechanical motion causing an impeller attached to the piezoelectric actuator to move along an axis; and a slip ring which receives the actuator signal from the control circuit and which connects said signal to the piezoelectric actuator.
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9. Apparatus for the control of noise generated by rotating machinery comprising:
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a hub, slideably connected to a motor, being rotatable about an axis; an error sensor mounted to the hub; a vibration sensor mounted to the hub; a control circuit, mounted to the hub, which receives signals from the error sensor and the vibration sensor, which control circuit develops at least one actuator signal; and an actuator attached to a motor, which receives the actuator signal from the control circuit and transforms it into mechanical motion causing the hub to move along its axis. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for the control of noise generated by an air moving device comprising:
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a hub, supporting at least one blade, slideably connected to a motor, being rotatable about an axis; a microphone mounted to the hub; a vibration sensor mounted to the hub; a control circuit mounted to the hub, which receives signals from the microphone and the vibration sensor, which control circuit develops at least one actuator signal; and an actuator attached to a motor, which receives the actuator signal from the control circuit and transforms it into mechanical motion causing the hub to move along its axis thereby, canceling one or more tones generated by the air moving device.
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19. Apparatus for the control of noise generated by rotating machinery comprising:
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means for sensing force mounted directly upon the rotating machinery; a control circuit receiving a signal from the force sensing means, which develops an actuator signal; an actuator shaft driven in a circular motion by a motor, which actuator shaft supports one or more blades; and
,an actuator attached to the actuator shaft which receives the actuator signal from the control circuit whereby the actuator shaft is driven in a broad band of frequencies along its axis. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. Apparatus for the control of noise generated by an air moving device comprising:
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at least one microphone; an accelerometer mounted on a motor; a control circuit receiving signals from the microphone and the accelerometer, which develops an actuator signal; an actuator shaft driven in a circular motion by a motor, which actuator shaft supports one or more blades; and
,an actuator attached to the actuator shaft which receives the actuator signal from the control circuit whereby the actuator shaft is driven in a spectrum of frequencies which cancel noise from the rotating air moving device.
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28. Apparatus for the control of noise generated by rotating machinery comprising:
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at least one error sensor; means for sensing motion; a control circuit for receiving signals from the error sensor and the motion sensing means, which control circuit develops at least one piezoelectric element signal; a motor shaft driven in a circular motion by a motor, which motor shaft supports at least one blade; at least one piezoelectric element mounted to each blade; and a slip ring which receives at least one piezoelectric element signal from the control circuit and which connects at least one piezoelectric element signal to at least one piezoelectric element. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. Apparatus for the control of noise generated by an air moving device comprising:
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at least one microphone for sensing tones; a tachometer for sensing motion of the air moving device; a control circuit for receiving signals from the microphone and the tachometer, which control circuit includes filters, analog to digital converters, signal processors, digital to analog converters, and amplifiers which generate piezoelectric element signals; a motor shaft driven in a circular motion by a motor, which motor shaft supports at least one blade; a piezoelectric transducer mounted to each blade; and a slip ring which receives at least one piezoelectric element signal from the control circuit and which connects at least one piezoelectric element signal to at least one piezoelectric element whereby at least one piezoelectric element is caused to vibrate in at least one frequency. - View Dependent Claims (40, 41, 42, 43)
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44. A method for the active control of noise generated by rotating a machinery comprising:
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generating an error signal; sensing machinery motion for generating a motion signal; processing the aforementioned signals for generating an actuator signal; and driving an actuator mounted upon the rotating machinery according to the actuator signal. - View Dependent Claims (45, 46)
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47. A method for the active control of noise generated by an air moving device comprising:
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generating an error signal; sensing machinery motion for generating a motion signal; filtering frequency components of the motion signal and the error signal; converting filtered analog signals to digital form; comparing digital signals with an algorithm; generating an actuator signal; converting the actuator signal from digital to analog form; and driving an actuator mounted directly upon the rotating machinery.
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48. A method for the active control of noise generated by rotating machinery comprising:
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sensing forces caused by the rotating machinery for generating a machine force signal; generating an error signal; processing the aforementioned signals for generating an actuator signal; driving an actuator mounted directly upon the rotating machinery. - View Dependent Claims (49, 50)
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51. A method for the active control of noise generated by an air moving device comprising:
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sensing forces caused by the rotating machinery for generating a machine force signal; generating an error signal; converting the machine force signal and the error signal to digital form; applying an algorithm to said digital signals; generating an actuator signal; converting the actuator signal to analog form; and driving an actuator mounted on the air moving device whereby the forces are impressed upon an impeller to control noise.
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52. A method for the active control of rotating machinery noise comprising:
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generating at least one error signal; sensing machinery motion for generating a motion signal; processing the error signal and the motion signal for generating at least one piezoelectric element signal; and directing a piezoelectric element signal to at least one piezoelectric element mounted on a blade of a motor shaft which is driven by the machinery. - View Dependent Claims (53, 54, 55, 56, 57, 58)
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59. A method for the active control of air moving device tones comprising:
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generating an error signal; sensing machinery motion for generating a motion signal; filtering frequency components of the motion signal and the error signal; converting filtered analog signals to digital form; comparing digital signals with an algorithm; generating piezoelectric element signals; converting the piezoelectric element signals from digital to analog form; and driving at least one piezoelectric element mounted to a motor shaft driven in a circular motion by a drive motor, which motor shaft supports at least one blade. - View Dependent Claims (60, 61, 62, 63)
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Specification