System and method for generation and control of mechanical vibration
First Claim
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1. A method for controlling a vibration-producing device, comprising:
- continuously sensing vibration from the device to obtain a vibration signal in a time domain;
transforming the vibration signal into a frequency domain;
measuring both a frequency spectrum and an amplitude distribution of the vibration signal;
separately comparing the measured frequency spectrum and at least one statistical characteristic of the amplitude distribution against respective reference values of the same;
independently adjusting both the frequency spectrum and a randomized phase in response to results of the comparison, the randomized phase having a specified non-uniform distribution of phases according to a target of the statistical characteristic;
combining, in the frequency domain, the adjusted frequency spectrum with the randomized phase on a frequency-by-frequency basis;
converting the combined signal back into a time domain to obtain a drive signal; and
applying the drive signal to the vibration-producing device.
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Abstract
A vibration generation system and method independently controls both frequency spectrum and amplitude distribution. Sensed vibration is used in feedback as a control to generate a controlled drive signal applied to a mechanical actuator. The amplitude distribution has a specified statistical characteristic adjusted to match a target characteristic, such as kurtosis, by adjusting a relative proportion of a coherent component in a randomized phase, which is then combined on a frequency-by-frequency basis with the separately adjusted frequency spectrum while in the frequency domain.
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Citations
14 Claims
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1. A method for controlling a vibration-producing device, comprising:
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continuously sensing vibration from the device to obtain a vibration signal in a time domain; transforming the vibration signal into a frequency domain; measuring both a frequency spectrum and an amplitude distribution of the vibration signal; separately comparing the measured frequency spectrum and at least one statistical characteristic of the amplitude distribution against respective reference values of the same; independently adjusting both the frequency spectrum and a randomized phase in response to results of the comparison, the randomized phase having a specified non-uniform distribution of phases according to a target of the statistical characteristic; combining, in the frequency domain, the adjusted frequency spectrum with the randomized phase on a frequency-by-frequency basis; converting the combined signal back into a time domain to obtain a drive signal; and applying the drive signal to the vibration-producing device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vibration system for producing randomized mechanical oscillations with simultaneous shaping of both frequency spectrum and phase distribution, comprising:
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a vibration generator driven by an analog drive signal; at least one vibration-sensing transducer for continuously producing an output signal representative of mechanical oscillations from vibration generator; an analog-to-digital converter coupled to the sensing means to convert the output signal into a digital control signal; a computer data processor coupled to the analog-to-digital converter to receive the digital control signal and programmed with stored routines so as to operate upon the control signal to generate a digital drive output computed to produce randomized mechanical oscillations from the vibration generator such that the randomized mechanical oscillations are characterized by having a specified frequency spectrum and amplitude distribution, the computing of the digital drive output carried out by the computer including steps of (a) transforming the vibration signal into a frequency domain, (b) measuring both a frequency spectrum and a statistical characteristic of the amplitude distribution for the vibration signal, (c) separately comparing the measured frequency spectrum and statistical characteristic against respective reference values of the same, (d) independently adjusting the frequency spectrum and a randomized phase in response to results of the comparison, the randomized phase having a specified non-uniform distribution of phases according to a target of the statistical characteristic, (e) combining the adjusted frequency spectrum and randomized phase components of the signal in the frequency domain, and (f) converting the combined signal back into a time domain to obtain the digital drive output; and a digital-to-analog converter coupled to the computer to convert the digital drive output into the analog drive signal that drives the vibration generator.
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Specification