基于幂指数法的地震模拟振动台频域前馈补偿方法

Frequency-domain feedforward compensation method for earthquake shaking tables based on the power exponential method

摘要:

针对地震模拟振动台受到系统和试件非线性等因素影响,导致波形再现精度不高的问题,提出基于幂指数法的地震模拟振动台频域前馈补偿方法以提高振动台的控制效果,通过数值仿真和实际振动台试验对该方法的控制性能进行研究。研究结果表明:基于幂指数法的地震模拟振动台频域前馈补偿方法能够快速收敛,迭代次数较少,可以大幅提高振动台的波形复现精度,能够提高振动台的控制性能。

Abstract:

The operation of electrohydraulic servo earthquake shaking tables can be affected by the system and type nonlinearities, leading to inaccurately reproduced waveforms. We propose a frequency-domain feedforward compensation method based on the power exponential method to improve the control of a shaking table during an earthquake simulation. The performance of the proposed method is evaluated using numerical simulations and actual earthquake shaking table tests. The results show that the proposed method converges quickly and requires fewer iterations than other methods. As a result, the waveform reproduction accuracy of earthquake shaking tables and their control performance can be significantly improved.