Research On Spring Adjustment Test-Bed Of Locomotive Bogie Based On Virtual Instrument Technology

Railway is the main transportation mode in China, playing a leading part in traffic and transport. With the development of high speed, heavy load train, the dynamics performance of the locomotive has been put forward higher requirements. Bogie is the running component of the vehicle. Its quality makes a direct influence on the dynamics properties and safety of rolling stock. Because of manufacturing factors, there is some deviation between the bogie's actual performance parameters and its theoretical parameters. The result often causes the characteristics of bogie can't reach the design target. Also the bogie performance will get worse when it runs for some time. The discrepancy of wheel and axle load limits the use of locomotive traction force. When reduction rate of wheel load is a little large, uneven distribution of locomotive bogie wheel and axle load will not only make a negative impact on traffic safety, but also easily result in polygon tear on wheel and wave wearing on tracks.In order to meet the development of rail transport, it's an important subject to research and design bogie test system which can measure bogie wheel and axle load and provide the adjustment scheme for their deviation. Based on the analysis on the test-bed of locomotive bogie at home and abroad, combined with the characters of locomotive bogie in China, In the paper spring adjustment technology of the test-bed has been studied. The whole test-bed structure is made up of mechanic structure, hydraulics equipment and measurement system. Mechanic part is used for installing loading devices, bearing testing equipments and bogie. Hydraulics device is applied to controlling the weighting track and simulation the weight of locomotive body loaded on the bogie. Measurement unit realizes detecting for geometric parameters and load distribution of bogie, offering the compensation adjustment program according to the measuring result.In the thesis, on the basis of studying on the uneven distribution reasons of wheel and axle load, combined with bogie structure, the mathematical model for adjusting wheel and axle load is set up. In accordance with the optimization theory, optimization methods are realized. Through the simulation and analysis results of programs using virtual prototyping technology, at last, Lagrang is chose as the arithmetic for spring adjustment.Based on virtual instrument development environment Labview, the detecting system is accomplished with a nice human-computer operation interface. The system realizes real-time monitoring bogie's loading process, acquiring data from sensors, computing the numbers of gasket by embedding optimization programs into it combing Labview with C++, according to Access database technology, the detected result can be saved and managed well.