Patent ID: 11879816
Assignee: IMV CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  B | IPC G

Claim 10:
11. A vibration control system comprising:
an acceleration sensor configured to detect, acceleration of a test object that is vibrated by a vibration generator operated on the basis of a drive waveform;
a processor and memory, the processor executing instructions stored in memory that:
acquire a response acceleration PSD by subjecting a response acceleration waveform from the acceleration sensor to the Fourier transform;
determine a vibration physical quantity PSD for control corresponding to acceleration PSD for control on the basis of the response acceleration PSD and reference acceleration PSD, the vibration physical quantity PSD for control being displacement PSD for control, or velocity PSD for control, or jerk PSD for control;
determine a Gaussian random waveform of a corresponding vibration physical quantity for control by subjecting amplitude spectrum data, which is generated from the displacement PSD for control, or the velocity PSD for control, or the jerk PSD for control, to the inverse Fourier transform by providing uniformly distributed random phases, Gaussian random waveform of a corresponding vibration physical quantity for control being a Gaussian random waveform of displacement for control, or a Gaussian random waveform of velocity for control, or a Gaussian random waveform of the jerk for control;
determine and provide drive waveform determination instructions with the Gaussian random waveform of displacement for control, or the Gaussian random waveform of velocity for control, or the Gaussian random waveform of jerk for control as is as a displacement waveform for control, a velocity waveform for control, or a jerk waveform for control in the case where any portion that exceeds a limit value is not present in said Gaussian random waveform of the displacement for control, said Gaussian random waveform of the velocity for control, or said Gaussian random waveform of the jerk for control in a prescribed unit period, and provide the drive waveform determination instructions with a non-Gaussian random waveform of the displacement for control, or a non-Gaussian random waveform of the velocity for control, or a non-Gaussian random waveform of the jerk for control, which is determined by a non-Gaussian conversion instructions, non-Gaussian signal phase extraction instructions, and waveform calculation instructions, as the displacement waveform for control, the velocity waveform for control, or the jerk waveform for control in the case where the portion that exceeds the limit value is present;
determine the drive waveform on the basis of the displacement waveform for control, the velocity waveform for control, or the jerk waveform for control with inverse characteristics of transfer function of a system including a vibration generator and the test object as equalization characteristics;
output the drive waveform, via a drive signal, to the vibration generator to test the test object;
determine an acceleration transfer function on the basis of the drive waveform and the response acceleration waveform;
convert the acceleration transfer function into a displacement transfer function, a velocity transfer function, or a jerk transfer function; and
determine the equalization characteristics as a reciprocal of the displacement transfer function, the velocity transfer function, or the jerk transfer function.