Patent ID: 8942930
Filing Date: 2015-01-27
Classification: G01M

Abstract:
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.