THE INFLUENCE OF SPECIMEN-TRANSFER-SYSTEM INTERACTION ON THE STABILITY OF REAL-TIME SUBSTRUCTURING SYSTEM

In Real-Time Dynamic Substructure (RTDS) testing, the easily modeled part is simulated numerically and the rest part is tested physically, so that the capacity of the existing facilities can be enhanced indirectly. The stability caused by the dynamics of transfer system and specimens are the challenge for the implication of RTDS testing. In previous research, the coupling dynamics of transfer system and specimens were neglected. In this paper, a dynamic coupling model was established for actuator and shaking table respectively. To consider the transfer-system-specimen interaction in the analysis of RTDS stability, a novel analysis method was developed and verified through analytical and experimental comparison. Using the developed method, the influence of transfer-system-specimen interaction on the stability of actuator and shaking table RTDS was discussed. The analysis results show that the transfer-system-specimen interaction is sometimes beneficial and sometimes detrimental to RTDS stability.