Rail Vehicle Dynamic Wheel Load Test Design

Railway transportation is a very important part in China, the performance and quality of wheel-set plays a decisive role in the safe driving on the railway and normal life, Therefore, we must carry on performance testing before loading. At present, the wheel-set test platform we used for railway engineering vehicles and Large Track Maintenance Machine loading tests are mainly for loading radial force and torque both, some test-bed even used no-load running-in. There are two methods to deal with the energy when torque loading:power dissipation and energy consumption, but, with the trend of increasingly serious energy shortage, these two approaches have unable to meet the needs of new situation, this makes the development of an efficient, energy saving and sustainable development of a new approach is more urgent. Aiming at the existing problems of wheel-set's loading and running-in, analysis and discussion on its energy handles of loading and loading system, main tasks are as follows:1. Review the characteristics of the experimental device of existing test platform, analysis the current method use in wheel-set experiments, based on the characteristics of each and experimental method, point out the shortcomings and propose solutions.2. According to the performance requirements of wheel-set, carry on the hydraulic system control method. Wheel-set loading system mainly of drive system and loading system, wheel-set drive system is mainly used for rotation and torque load, loading system for radial force exerted on the wheel. Adopts power closed system as the drive system can realize work process to the energy recycling, and the proportional pressure reducing valve as the loading system pressure control mode can save energy. The system is simple, reliable, and can achieve continuously adjust on bearing.3. Constructing the main loop and mathematical model of hydraulic drive system for wheel-set test-bad. In-depth study of the work test bed, analysis of each circuit and the main components and working principle of the internal structures, establish the mathematical model and analyze it for further research and lay the foundation for transformation of the system.4. Using graphical simulation software AMESim established the driving system and the loading system simulation model, design the HCD modeling of proportional pressure reducing valve. According to system design, determines various simulation parameters offspring into model to analysis the driving characteristics and loading characteristics of dynamic analysis.5. Establish the wheel-set test-bad, the experiment results show the design of the test-bad of the hydraulic system has good performance on loading and control.