TEST SYSTEM AND TEST METHOD FOR NATURAL VIBRATION FREQUENCY OF BOGIE OF TRACK VEHICLE

摘要

A test system and a test method for the natural vibration frequency of a bogie of a track vehicle, which belong to the technical field of mechanical performance tests. The test system is composed of a test platform (1), vertical actuators (2), a half-vehicle mass simulation device (3) and vertical actuators (4), wherein wheelset clamping mechanisms (5) are installed on the test platform (1); the bottom of each of four corners of the test platform (1) is respectively connected to one downward vertical actuator (2); and the half-vehicle mass simulation device (3) is arranged above the test platform (1). During a test, wheels of a bogie are fixed to the test platform (1) by means of the wheelset clamping mechanisms (5), then the half-vehicle mass simulation device (3) is fixedly connected to a bogie bolster, a laser displacement sensor is respectively arranged at each of four corners above a side beam of a bogie frame, the laser displacement sensor is connected to a data collection system, an excitation signal is applied to each vertical actuator (2) through a hydraulic servo system, and the data collection system records the change of the displacement of an end for the side beam of the frame, thereby obtaining a response curve between a displacement and a frequency, so as to determine a natural vibration frequency in a formation corresponding to the frame and a vehicle body. The system has a simple structure and high test accuracy, and can really reflect the natural vibration characteristic of a vehicle.