振動台における外乱抑圧特性を考慮した供試体反力補償器設計

摘要

This paper presents a practical control methodology of the shaking tables for earthquake simulators. Reaction force generated by a nonlinear specimen on the shaking table generally deteriorates the motion performance of the table, resulting in the lower control accuracy of the seismic tests. In order to provide the precise table motion, therefore, a compensator for the reaction force is designed by using a force sensor. The compensator can be designed under considerations of the relationship between the reaction force and the compensation signal, to achieve the desired disturbance suppression performance. The proposed approach has been verified by experiments using an prototype shaking table system.%振動台は，テーブル上に加振対象の構造物（以下，供rn試体）を設置し，油圧加振機でテーブルを加振して供rn試体の振動応答を評価する耐震試験装置の一つでrnある．振動台の目的は，テーブル上の供試体に正確なrn地震加速度を与えることであるが，供試体が振動するrnことによって発生する反力（以下，供試体反力）が振rn動台制御系の外乱として作用するため，所望の制御性rn能を達成することが困難となる．