Design and Research of Dynamic Loading System for High-speed EMU Axle Box Bearing Reliability Test Bench

Abstract

Objective Bench test is a primary technical means for studying the performance of high-speed EMU (electric multiple units) axle box bearings. Accurately simulating the practical operational load conditions of axle box bearings is essential for obtaining authentic and reliable performance data. A test bench for axle box bearings is reasonably designed to simulate the high-speed, heavy-load operational conditions. Control strategies for radial and axial loading mechanisms are developed to meet the requirements for control precision and response speed of the loading system. Method A dynamic loading system with electro-hydraulic servo is designed for the high-speed EMU axle box bearing reliability test bench. The structural composition and working principles of the axial and radial loading systems within this setup are introduced and a fuzzy-PID (proportional-integral-derivative) control algorithm is proposed. The axle box bearing reliability analysis test bench is constructed to conduct loading performance tests and axle box bearing reliability testing, thereby validating the rationality of the dynamic loading system. Result & Conclusion Test results indicate that the designed electro-hydraulic servo dynamic loading system meets the loading requirements for axle box bearing reliability test. The axial loading response time is 0.276 s, the axial loading steady-state error is 0.339 kN, and the radial loading steady-state error is 1.742 kN, all of which satisfy requirements specified in the EN 12082:2017 standards.

Keywords

• high-speed emu
• axle box bearing
• reliability test bench
• dynamic loading system