Research On Brake System Of Impact Test Track For Railway Vehicles

Abstract:With the rapid development of China’s high-speed rail industry, Passive safety of rail vehicles has gradually been more concerned. Current passive safety research methods of train vehicles has long-term stayed in the numerical simulation and component testing stage. There will be years for China to catch up with European countries and America. In the demands of independent designing and manufacturing high-speed trains and formulating suitable crashworthiness standards for our country’s railway vehicles, construction of crash test system of train vehicles is very urgent and significant.Based on analysis and comparation of the existing systems, this paper choosed a reasonable plan to construct the test line, elaborated on the process of determining the braking system design basis and design parameters and designed a float-clamping brake pressure loading mechanism. After designing of the braking pair, mounting foundation and drive car, this paper used simulation software to analysis stiffness of the clamping mechanism and static strength of all the parts. Results showed that the design can sastisfy the demands.In this paper, the dynamic interaction of braking pair during braking and the frictional heat distribution by the thickness of braking plate was simulated. Results showed that with the increase of thickness, the impact between the braking pair, temperature of the braking plate and braking capacity of every brake unit had increased. The brake mount sufferred great stress concentration at corners of the contact area, produced by the impact force. The bottom of the mount was the weakest part of the whole structure. Since the braking time was short, the temperature rise generated by friction was not high, so that would cast little affect on the property of the braking structure and the coefficient of friction.According to the requirement of load conditions, this paper designed a hydraulic loading system. The main parameters of the hydraulic system were calculated. Dynamic response characteristics to impact of the pressure-holding accumulator circuit and feedback control system were studied through simulation. The results showed that the pressure-holding accumulator circuit has the ability to buffer the impact better, and the feedback control system has faster response speed.