A noise reduction system for a device having a noise generating subsystem includes a Helmholtz resonator and a controller. The Helmholtz resonator is disposed in fluid communication with the noise generating subsystem, and includes an active material responsive to a control signal that adjusts a dim
A noise reduction system for a device having a noise generating subsystem includes a Helmholtz resonator and a controller. The Helmholtz resonator is disposed in fluid communication with the noise generating subsystem, and includes an active material responsive to a control signal that adjusts a dimensional characteristic of the Helmholtz resonator in such a manner as to affect a resonance characteristic of the Helmholtz resonator. The controller is responsive to an operational characteristic of either the device or the noise generating subsystem to produce the control signal. In response to the operational characteristic, the control signal serves to affect the resonance characteristic of the Helmholtz resonator in such a manner as to reduce a noise arising from the noise generating subsystem, or create a desirable sound quality alteration.
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What is claimed is: 1. A noise reduction system for a device comprising a noise generating subsystem, the noise reduction system comprising: a Helmholtz resonator disposed in fluid communication with the noise generating subsystem, the Helmholtz resonator comprising a neck, and a resonance volume c
What is claimed is: 1. A noise reduction system for a device comprising a noise generating subsystem, the noise reduction system comprising: a Helmholtz resonator disposed in fluid communication with the noise generating subsystem, the Helmholtz resonator comprising a neck, and a resonance volume comprising a wall, at least one of the neck and the wall being formed from an active material responsive to a control signal that adjusts a dimensional characteristic of the Helmholtz resonator in such a manner as to affect a resonance characteristic of the Helmholtz resonator; and a controller responsive to an operational characteristic of either the device or the noise generating subsystem to produce the control signal; wherein in response to the operational characteristic, the control signal serves to affect the resonance characteristic of the Helmholtz resonator in such a manner as to reduce a noise arising from the noise generating subsystem, or create a desirable sound quality alteration. 2. The noise reduction system of claim 1, wherein the device comprises an engine, and the operational characteristic comprises a speed of the engine. 3. The noise reduction system of claim 2, wherein the noise generating subsystem comprises an air intake duct in fluid communication with the engine. 4. The noise reduction system of claim 1, wherein the control signal serves to tune the Helmholtz resonator to a desired frequency, thereby damping inherent effects of noise level at harmonic frequencies. 5. The noise reduction system of claim 2, wherein the device comprises engine control module (ECM) comprising information associated with the speed of the engine. 6. The noise reduction system of claim 1, wherein: the resonance characteristic of the Helmholtz resonator is defined by at least one of an intake orifice opening of the Helmholtz resonator, an intake neck length of the Helmholtz resonator, an intake cross-sectional area of the Helmholtz resonator, and a resonance volume of the Helmholtz resonator; and a dimensional characteristic of the Helmholtz resonator adjusted by the control signal comprises at least one of the intake orifice-opening of the Helmholtz resonator, the intake neck length of the Helmholtz resonator, the intake cross-sectional area of the Helmholtz resonator, and the resonance volume of the Helmholtz resonator. 7. The noise reduction system of claim 1, wherein: the noise generating subsystem comprises an air conditioning subsystem comprising a blower and an air duct; the operational characteristic comprises a speed of the blower; and the Helmholtz resonator is disposed in fluid communication with the air duct. 8. The noise reduction system of claim 1, wherein the controller comprises a sensor disposed responsive to a fluid pressure arising from the noise generating subsystem, and the operational characteristic is defined by the fluid pressure. 9. The noise reduction system of claim 1, wherein the controller comprises a processing circuit responsive to computer executable instructions which when executed on the processing circuit facilitates producing the control signal in response to the operational characteristic to affect the resonance characteristic of the Helmholtz resonator in such a manner as to reduce the noise arising from the noise generating subsystem. 10. The noise reduction system of claim 9, wherein: the device comprises an engine; the operational characteristic comprises a speed of the engine; and the controller comprises an electronic map or lookup table that defines a voltage of the control signal as a function of the speed of the engine. 11. The noise reduction system of claim 10, wherein: the defined voltage of the control signal is productive of a dimensional change of the active material of the Helmholtz resonator that serves to tune the resonance characteristic of the Helmholtz resonator to a desired frequency, thereby damping inherent effects of noise level at the harmonic frequencies. 12. The noise reduction system of claim 10, wherein the processing circuit is further responsive to computer executable instructions which when executed on the processing circuit facilitates: defining a tuning frequency of the Helmholtz resonator as a function of the speed of the engine; defining a desired dimension of at least a portion of the Helmholtz resonator capable of being changed by application of the control signal to the active material, the desired dimension being a function of the tuning frequency; and defining the voltage of the control signal as a function of the desired dimension. 13. The noise reduction system of claim 1, wherein the active material comprises a shape memory alloy, a shape memory polymer, a ferromagnetic shape memory alloy, a magnetorheological elastomer, a magnetostrictive material, an electrorestrictive material, a piezoelectric material, piezoceramic material, an electroactive polymer, a magnetorheological fluid, or an electrorheological fluid. 14. The noise reduction system of claim 1, wherein the Helmholtz resonator comprises walls that define a resonator volume and an inlet neck having an inlet orifice opening, at least a portion of the walls being formed from an active material responsive to the control signal. 15. The noise reduction system of claim 1, further comprising an actuator comprising an active material responsive to the control signal, the actuator being coupled to at least a portion of the Helmholtz resonator to cause adjustment of a dimensional characteristic of the Helmholtz resonator in response to the control signal. 16. A method for reducing noise in a device comprising a noise generating subsystem, the method comprising: in response to an operational characteristic of either the device or the noise generating subsystem, generating and sending a control signal to a Helmholtz resonator disposed in fluid communication with the noise generating subsystem, the Helmholtz resonator comprising a neck, and a resonance volume comprising a wall, at least one of the neck and the wall being formed from an active material responsive to the control signal by adjusting a dimensional characteristic of the Helmholtz resonator in such a manner as to affect a resonance characteristic of the Helmholtz resonator; wherein in response to the operational characteristic, the control signal serves to affect the resonance characteristic of the Helmholtz resonator in such a manner as to reduce noise level arising from the noise generating subsystem. 17. A noise reduction system for a device comprising a kinetic energy generator coupled to a noise generating subsystem, the noise reduction system comprising: a controller productive of a control signal; a Helmholtz resonator disposed in fluid communication with the noise generating subsystem, the Helmholtz resonator comprising an active material responsive to the control signal that adjusts a dimensional characteristic of the Helmholtz resonator in such a manner as to affect a resonance characteristic of the Helmholtz resonator; a first sensor disposed in signal communication with the noise generating subsystem of the device, and in signal communication with the controller, the first sensor being responsive to air pressure within the noise generating subsystem; a second sensor disposed in signal communication with the kinetic energy generator, and in signal communication with the controller, the second sensor being responsive to an operational frequency of the kinetic energy generator including a primary frequency of the kinetic energy generator; the controller being responsive to a signal from the first sensor and a signal from the second sensor to produce the control signal; wherein the control signal serves to affect the resonance characteristic of the Helmholtz resonator in such a manner as to reduce a noise arising from the noise generating subsystem, or create a desirable sound quality alteration, the primary frequency of the kinetic energy generator being used by the controller to adjust the control signal to tune the desired noise reduction. 18. The noise reduction system of claim 17, wherein the controller comprises an electronic map or lookup table that defines a voltage of the control signal as a function of the primary frequency. 19. The noise reduction system of claims 18, wherein: the Helmholtz resonator comprises a neck, and a resonance volume comprising a wall; and at least one of the neck and the wall are formed from the active material responsive to the control signal that adjusts a dimensional characteristic of the Helmholtz resonator in such a manner as to affect the resonance characteristic of the Helmholtz resonator.
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