3D14 Frequency range expansion into elastic vibration on the system of hardware in the loop simulation for railway vehicle(The 12th International Conference on Motion and Vibration Control)

Abstract

It is expected to shorten the development process and to improve the quality if it comes to be able to reproduce railway vehicle motion on real track in detail by some bench tests. Therefore, we have been developing a 'Virtual Running Test Environment' based on Hardware In the Loop Simulation (HILS) technology, which can replace running tests with bench tests. This already developed HILS system for the railway vehicle aimed at reproducing only the rigid body motion of a railway vehicle under running conditions. However, in order to realize more realistic virtual running test environment, it is needed to include the vibration in higher frequency range such as elastic vibration of the carbody. Therefore, we plan the expansion of the frequency range of the HILS system to reproduce and evaluate the elastic vibration of the carbody for the railway vehicle. To improve the system, we worked out two problems. One is the problem in hardware; we show that it is possible to divide into several frequency ranges when the excitation test is conducted. For using this characteristic properly, we use two types of test equipment for different target frequencies: one is able to excite objects in three dimensions to emulate actual running conditions of railway vehicles and the other works only in one direction, but it can excite in a higher frequency range such as the elastic vibrations. The other is software; we develop a procedure to generate an identification model using vibration data from stationary tests. The obtained model is a multi-input multi-output system and a high accuracy time-domain model which works in real time. Furthermore, we confirm that it predicts the elastic vibration with satisfactory accuracy comparing with the validation test results on rolling stock testing plant at Railway Technical Research Institute (RTRI).