变刚度负载下激振测试系统滑模控制特性分析

摘要

以高铁路基测试系统为研究对象,由于该测试系统需要具有振动频率高、激振力大和振幅大的特点,目前其动态响应特性比较低,还需要进一步的提高才能适应测试要求.提出了一种滑模控制器来提高该高铁路基测试系统在变刚度负载下的动态响应.利用MATLAB/Simulink仿真软件,在变刚度负载下使用滑模控制的方法对高铁路基测试系统进行仿真分析,在运用滑模控制器后系统的动态响应特性有了明显的提高.采用该技术能够加快未来高铁交通运输的发展,对国家经济发展起一定的促进作用.%High vibration frequency,high excitatory force and large vibrating amplitude are required for the high speed rail-based test system,but the dynamic response of the high speed rail-based test system is relatively low,which still needs to be further improved.In order to improve the dynamic response of the high speed rail-based test system under the load of variable stiffness,a sliding mode controller is designed in this study.The simulation analysis for the roadbed of high-speed railway test system through sliding mode controller under the load of various stiffness is conducted by MATLAB/Simulink software.After the sliding mode controller is applied,the dynamic performance of the system is significantly improved.The effective improvement of the dynamic response characteristics for the high speed rail-based test system can quicken the development of future high-speed rail transport,and will play a good role in the country's economic development.