| The high-speed railway construction has been developing in China, at the same time, dynamic response of the track bed has been a serious lack of experimental techniques restricted the development of high-speed railway, the development of dynamic response of rail construction and road test technology has important theoretical and practical value. Based on the dynamic response of the track foundation aims to develop a set of simulated train loading system, hydraulic vibration, dynamic stability for the study of high speed railway to provide an effective tool. Firstly, starting from the servo cylinder vibration, design a dynamic, static output power stack dual-chamber large thrust cylinder vibration, dynamic pressure chamber output alternating excitation, static pressure chamber output constant excitation, the two power superposition of simulated subgrade contained. All moving parts vibrating cylinder gap between the seal used to reduce friction and ensure high frequency response, using the theoretical formula of analysis on the servo cylinder excitation gap seal leakage by several factors. Home and abroad, the hydraulic inertia exciting advantages and disadvantages, design appropriate to the dynamic, static pressure chamber to simulate the effective control of embankment loading on hydraulic vibration control system. Finally, in the help of AMESim software, designed large thrust and high frequency servo cylinder excitation modeling and simulation, under way on the clearance seal leakage of hydraulic cylinder, friction study. Using AMESim software designed to control the first move, static excitation system, a separate chamber of hydraulic modeling and simulation to verify its feasibility, and then build the entire package of all model excitation system model and its simulation, to verify the design hydraulic vibration system can meet the high-frequency, high-thrust requirements of excitation, maximum exciting force can be achieved 250KN, the excitation frequency 1HZ to 40HZ. |
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