Gearbox noise reduction by electrical drive control
First Claim
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1. A system for damping audible noise from a drive train, the system comprising:
- a sensor to detect an audible noise signal from the drive train, the audible noise signal including a vibration component at a frequency corresponding to an acoustic resonant frequency of a mechanical structure surrounding the drive train or a mechanical resonant frequency of the drive train and a noise level proportional to an amplitude of the audible noise signal;
a damping circuit configured to produce a damping torque signal, wherein said damping torque signal is a phase shifted and amplified version of the audible noise signal from said drive train, the audible noise signal and damping torque signal having a same frequency;
an electrical generator or an electrical motor coupled to said drive train; and
a converter to apply the damping torque signal to an air-gap torque of said electrical generator or said electrical motor to reduce said audible noise only when the noise level is greater than a pre-determined threshold noise level.
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Abstract
A system for damping audible noise from a drive train. One embodiment is a system with an audible noise signal from a drive train wherein a damping circuit produces a damping torque that is a phase shifted and amplified version of the noise signal that is applied to the air-gap torque of a generator or motor coupled to the drive train and effectively reduces the audible noise.
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Citations
21 Claims
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1. A system for damping audible noise from a drive train, the system comprising:
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a sensor to detect an audible noise signal from the drive train, the audible noise signal including a vibration component at a frequency corresponding to an acoustic resonant frequency of a mechanical structure surrounding the drive train or a mechanical resonant frequency of the drive train and a noise level proportional to an amplitude of the audible noise signal; a damping circuit configured to produce a damping torque signal, wherein said damping torque signal is a phase shifted and amplified version of the audible noise signal from said drive train, the audible noise signal and damping torque signal having a same frequency; an electrical generator or an electrical motor coupled to said drive train; and a converter to apply the damping torque signal to an air-gap torque of said electrical generator or said electrical motor to reduce said audible noise only when the noise level is greater than a pre-determined threshold noise level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for damping audible noise from a drive train, comprising;
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detecting an audible noise signal from said drive train, the audible noise signal including, a vibration component at a frequency corresponding to an acoustic resonant frequency of a mechanical structure surrounding the drive train or a mechanical resonant frequency of the drive train and a noise level proportional to an amplitude of the audible noise signal; generating a corrective damping signal, wherein said corrective damping signal has a phase shift and a frequency approximately equal to said audible noise frequency; modulating a torque signal with said corrective damping signal to produce a modulated torque corrective signal; and applying said modulated torque corrective signal to an air-gap torque of an electrical generator or an electrical motor coupled to said drive train to reduce said audible noise only when the noise level is greater than a pre-determined threshold noise level. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification