摘要
本文介绍了笔者对单向振动台地震模拟试验软件的研究开发工作;讨论了地震模拟的数控原理。指出精确再现地震波的关健是精确地获得系统传递函数。经理论分析,用迭代法多次修正驱动信号可有效地消除系统误差,但对偶然误差效果不明显。为提高地震波再现精度必须改善模控系统的稳定性和重复性。为减小非线性误差需改进台面及支承系统特性。文中给出了编制的两种地震波再现程序及应用效果。最后介绍了控制中采用的软启动方法和为满足模型相似条件的时间压缩技术。
This paper presents an introduction on the work of software development of our 3m×4m shaking table.Based on the principle of digital control in earthquake simulation,the authors conclude that the systematic transfer function which can be obtained precisely by experimental methods is the key factor in improving the reappearance accuracy of earthquake wave.The systematic errors can effectively re- duced through revising the drive signal by iteration.To improve the reappearance ac- curacy of earthquake wave and reduce the non-linear errors,the stability and repeatability of the analog system must be qualified,and the mechanic properties of the table and the bearing system must be satisfied. In this paper,two programable methods used by the authors to perform shaking table tests and the results of their applications are presented.Also,the practical meth- ods,such as soft start and compact time technique are discussed.
关键词
地震模拟
振动台
软件
数字控制
digital control
analog control
Fourier transform
transfer function
desired signal
drive signal
