On-Rail Continuous Measurement of Wheel/Rail Contact Point
Zhiqiang Wang · Zhongguo tiedao kexue · 2007
It′s very difficult to detect wheel/rail contact points of the running vehicle because of wheel rotation during railway vehicle operation.On-rail measurement of wheel/rail contact points is of great importance to the research of derailment mechanism and vehicle performance.On the basis of conventional instrumented wheelset,an electric bridge to induce the changes of contact point is added.Nonlinear equations between the contact point and the outputs of the bridges are set up by means of the theory of Fourier series.As it is difficult to work out real-time solutions for nonlinear equations,a method based on artificial neural network is studied to solve these equations.Neural network is trained to learn the non-linearity relationship between wheel/rail contact point and the bridge outputs,with the combination of various horizontal and vertical loads at different positions.Experiment results show that the position of contact point can be obtained more accurately and the forecast ability of the neural network is satisfactory.