Patent ID: 9317044
Filing Date: 2016-04-19
CPC Classification: G05D

Claim Text:
1. A method for controlling a vibration-producing device for limited displacement, comprising: continuously sensing vibration from the device to obtain a vibration signal in time domain; transforming both the vibration signal and a drive signal into frequency domain to obtain frequency spectra of the respective vibration and drive signals; calculating an inverse frequency response function from the frequency spectra of both the vibration and drive signals; adjusting the inverse frequency response function with a target profile that represents a desired spectral content of the vibration from the device so as to obtain a preliminary drive spectrum; independently modifying higher frequency and lower frequency components of the preliminary drive spectrum, including combining the higher frequency components with components of a randomized phase and converting the randomized signal back into time domain to obtain a higher-frequency time waveform, and modifying the lower frequency components by applying the lower frequency components to a narrowband time waveform having a low frequency range that is swept in time over the lower frequency components then converting the modified lower frequency components into time domain to obtain a lower frequency time waveform; combining both the higher-frequency and lower-frequency time waveforms together to obtain the drive signal; and applying the drive signal to the vibration-producing device.