Patent ID: 6189385
Filing Date: 2001-02-20
Classification: G01M

Abstract:
A shaking table, comprising:a table for loading a specimen under test; means for driving said table, having a characteristic of transfer function from a control signal to a driving force output (A);acceleration measuring means for measuring acceleration of said table;a control unit for outputting a control signal to said driving means with receiving an acceleration signal from said measuring means and with receiving a target signal; andmeans for detecting a force reacted by the specimen under test, and a force signal from said force detecting means is fed back to said control unit;wherein said control unit pre-processes the target signal (P), pre-processes the acceleration signal from said acceleration measuring means (B), generates a deviation signal (Z) by comparing the pre-processed target signal (X) with the pre-processed acceleration signal, and post-processes the generated deviation signal to output the control signal to said driving means (Q), and wherein said control unit is provided with a filter having an inverse of a transfer function representing a dynamic response of a control system sequentially connected from a feed back point of an output from said force detecting means to an output from said driving means.