Research On A New Wheel And Rail Relationship Test-Rig

Wheel-rail wear is always an important problem during the railway development of the whole world. In our country, the railway in mountainous area is in larger proportion. With the increasing of axle-load and train running speed, wheel-rail wear become more serious. According to statistics of railway ministry, the loss caused by wheel-rail wear is several billion Yuan every year. Besides the economic loss, the wear is one of the main causes of track irregularities, and this is bad for the ride comfort of vehicles. Larger force between wheel and rail will be caused by Excessive wear. This will easily causes derailment accident and affect the vehicle’s running safety seriously. So the problem of wheel-rail wear is urgent to be researched and resolved.Experiment is an indispensable technical mean for wheel-rail wear research. Experiment on wheel-rail mainly includes test-rig test and line test. The later will be closer to actual conditions, but the cost is much higher and it is not easy to individually test the effects of some factors influencing wheel-rail wear. Comparatively, test-rig test will be economic and quick. It is easy to test the effects of each factor influencing wheel-rail wear. At the same time, limit working condition can be reached on test-rig. Test-rig with good performance has great practicality significance on wheel-rail wear research.Traditional test-rigs of wheel-rail relationship are mainly based on wheel-wheel contact relationship. But there is still gap between wheel-wheel contact relationship and wheel-rail contact relationship. In this dissertation, a new type of test-rig based on wheel-rail contact relationship is proposed and relative research on the test-rig is done. This test-rig based on a new type of reciprocating mechanism:planetary gear-ring slider mechanism, and some of foreign test-rigs based on wheel-rail contact relationship are taken as reference. The main research content is:1. The characteristics of planetary gear-ring slider mechanism and traditional reciprocating mechanism are analyzed and compared. Planetary gear-ring slider mechanism is chosen as the transmission mechanism of test-rig. According to actual situation and relative standards, the loading scheme of test-rig is determined. The concrete structure of key components is designed.2. Kinematics of the key components of test-rig, grasp the kinematics’ characteristics of key components when the mechanism operated in different position is analyzed. How the different structure parameters affect on the kinematics of the mechanism is obtained.3. The force condition of main stressed member is analyzed. The force of the stressed member in the operation and how different structure parameters affect on the force condition is obtained.4. Combined with the kinematics analysis of planetary gear-ring slider mechanism and the design constraint of structure, optimum design applied to structure using the optimized toolbox of MATLAB. The kinematics’characteristics of the mechanism are simulated by using ADAMS, The simulation results are in agreement with that of optimum.5. The strength of key components is checked by using ANSYS. The key components can meet the strength requirement.