Research Of Excitation Position Control Of High-Speed Roadbed Test System

High-speed railway is a significant technical achievement in the railway field of the world which embodies the science and technology and the industrial level of a country. Currently the non-ballasted track is widely used around the world as the structure of high-speed rail track. However, China’s non-ballasted track is a lack of systematic, sophisticated design, as well as the construction and operational experience. In order to ensure the stability and security of the train running at a high speed, it is necessary to strengthen the theory and practice of non-ballasted track to obtain the law of dynamic response on the roadbed.To meet the testing requirements of the dynamic response on the track roadbed, a kind of Electro-hydraulic servo closed-loop excitation system is designed. Using a kind of vibration servo cylinder with static and dynamic pressure output which is active-controlled to meet the high vibration frequency and large output requirements.According to the test system requirements and force servo control principle, the position closed-loop servo control section is designed and its control methods are studied. Controlling the system with adaptive model following control method to eliminate the influence of the controlled system parameters change brought about by other factors such as time-varying. According to the basic principles of the adaptive method, different types of waveforms are applied in the simulation software to model. The simulation results show that the adaptive algorithm makes the system a high follow precision and strong ability of resistance to time-varying. Finally, based on computer-aided testing and virtual instrument, writing model following adaptive control Implementation process by programming software so that the software has various functions required by the subject’s performance.