地震模拟振动台三参量控制技术研究

Three-variable control technique for a seismic analog shaking table

对地震模拟振动台三参量控制算法进行了深入的研究,详细研究了三参量反馈及前馈环节对振动台系统特性的校正作用,并通过仿真和试验的方法进一步验证三参量控制算法对地震模拟振动台系统频响特性的改善效果:通过引入三参量速度反馈可以有效扩展系统的频宽,引入三参量加速度反馈可以有效提高系统的阻尼,三参量前馈控制能够对消系统闭环传递函数中距离虚轴较近的极点,实现系统频宽的进一步扩展。最后,通过对三参量伺服控制的地震模拟振动台进行地震波形再现试验,证明三参量控制算法能够实现较高精度的地震波形再现试验。

Three-variable control （TVC）algorithm for a seismic analog shaking table was studied deeply,and the correction action of the three-variable feedback and the three-variable feedforward step on the characteristics of the shaking table system was investigated in detail.Through simulation and field tests,the improvement effect of the three-variable control technique on the system frequency response characteristics of the seismic analog shaking table was verified.The system frequency bandwidth was expanded effectively by introducing the velocity feedback of TVC.The system damping was raised by introducing the acceleration feedback of TVC.The pole points of the system closed-loop transfer function close to the imaginary axis were eliminated and the system bandwidth was further extended by introducing the three-variable feedforward control.Finally,by conducting the seismic wave reproduction test on a three-variable controlled shaking table,it was shown that the TVC algorithm can realize a higher-precision seismic wave reproduction test.