Servo-controlled hydraulic vibration excitation system for high-speed rail track subgrade testing

Abstract

The invention relates to a servo-control hydraulic excitation system for a high-speed rail track roadbed test. The technical scheme of the invention is as follows: the oil press port of an oil pump (11) is respectively communicated with the P port of a servo valve (4) and the P port of a first magnetic exchange valve (6) through a first check valve (8) and a first filter (7); the A port and B port of the servo valve (4) are respectively correspondingly communicated with two working oil ports (26,29) of a dynamic pressure cavity (38) of a twin-stage servo hydraulic cylinder (2); the A port of the first magnetic exchange valve (6) is communicated with the oil inlet of a second check valve (5), the oil outlet of the second check valve (5) is respectively communicated with a second working oil port (24) of a static pressure cavity (45) of the twin-stage servo hydraulic cylinder (2), the A port of an electromagnetic ball valve (16) and an accumulator (3); and the working end of the twin-stage servo hydraulic cylinder (2) is connected with an excitation disc (17), and a right end cap (30) of the twin-stage servo hydraulic cylinder (2) is connected with a hydraulic excavator used for test. The servo-control hydraulic excitation system provided by the invention has the advantages of good dynamic response, small hydraulic system flow and good simulation effect, and meets the requirements of high excitation frequency and high exciting force simultaneously.

Description

technical field [0001] The invention belongs to a servo control hydraulic vibration excitation system. In particular, it relates to a servo-controlled hydraulic vibration excitation system for high-speed railway track subgrade testing. Background technique [0002] High-speed railway (hereinafter referred to as "high-speed railway") is the main development direction of railway construction in my country, but the lack of dynamic response test technology of track subgrade has seriously restricted the research and development of high-speed railway subgrade. At present, when studying the influence of the static load and the dynamic load of the train passing on the track subgrade at home and abroad, the mechanical inertial excitation system or the electro-hydraulic excitation system is mostly used. Due to the different materials of the subgrade, its natural frequency and other physical mechanics The characteristics are also different. It is required that the excitation frequency...

AI Technical Summary

Problems solved by technology

The pump-controlled motor vibration system is driven by the variable hydraulic pump to rotate the hydraulic motor, and the hydraulic motor drives the eccentric block to rotate, which is fundamentally inertial vibration; the valve-controlled cylinder vibration system is to control the cylinder through the reversing valve to achieve vibration. It can start vibration under heavy load and can output a variety of waveforms, but the dynamic response is poor and the flow rate of the hydraulic system is large, so it is difficult to meet the requirements of high vibration frequency and high excitation force at the same time

[0005] It can be seen that the current excitation system is difficult to meet the requirements of high-speed rail track subgrade testing

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