Method Study On Rolling Wheel

Wheel/rail force testing is the very important tache of vehicle dynamics theory and practice. The traditional method of wheel/rail force testing is using the wheelset of railway vehicle as the force sensor, and which has superior measuring precision. Because rolling wheel is the substitute for rail on the rolling rig, wheel/rail force can be tested according to the strain of its radials. Wheel/rail rolling contact is a very complicated process and which is neither physical linear nor geometrical linear. And the boundary condition is complicated. Moreover, it is difficult to choose appropriate strain gauge affix position by experimentation. However, it is easy to simulate various load working condition to obtain the stress distribution of the rolling wheel's radials by using Finite Element analyse, which can shorten the cycle and lower the cost of the experiment. In this paper an exact Instrumented Rolling wheel model is built in use of Finite Element Method. Compared with the radials of the Instrumented wheelset, the rolling wheel's is much more thick. So computer simulation shows that their transformation status is very different at the same force condition. In order to obtain better testing precision, it is necessary to study the bridge method of the Instrumented rolling wheel.This paper analyses the continuous measuring theory of Instrumented wheelset and also the technique difficulty and the existent problem. And then a new continuous measuring method of Instrumented rolling wheel is brought forward. Computer is used to simulate the stress of the Instrumented rolling wheel by using its Finite Element model. Compared with the traditional method, the improved method can get a more perfect output wave. The measuring model which brought forward in this paper also considers the effect of contact position to the horizontal and vertical bridge. BP neural network is used to fitting the complicated nonlinearity relation of the bridge output and wheel/rail force. Not only improved the measuring precision, but also got the wheel/rail force load position. The simulation result shows that the method of using BP network model to uncouple horizontal and vertical bridge is feasible, and the network we build is valuable on application.