Patent ID: 6697682
Filing Date: 2004-02-24
Classification: F16F,G05B,Y10T

Abstract:
A shaking table comprising:a table for mounting a specimen; actuators for exciting the table; a feedback controller for generating a drive signal for the actuators so that an inputted second command signal is agreed with a response signal indicating a vibration state of the table having the same dimension as this second command signal; an adaptive filter having variable filter coefficients which is supplied with an external first command signal indicating a target value of the response signal and generates the second command signal so as to compensate the transfer characteristic from the feedback controller to the table loading the specimen; a mask signal generator for generating a mask signal having no frequency component in the frequency band compensated by the adaptive filter; a first adder for adding the mask signal to the second command signal; a second adder for adding the mask signal to the response signal; and an identification unit which is supplied with the outputs of the first and the second adders, calculates the filter coefficients of the adaptive filter to compensate the transfer characteristics, and supplies the calculated coefficients to the adaptive filter.