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A PC-based multi purpose test bed environment for structural testing and control

The aim of the following paper is to give an overview of a test bed set up for a rail car body to compare different concepts to suppress structural vibrations. It is demonstrated, that such a complex measurement and actuation task can be easily implemented on a single laboratory PC using standard software like Matlab/SIMULINK®. With the help of this PC standard engineering tasks like measuring, identification of transfer functions, as well as controller design and their implementation in real time can be carried out easily. Additionally, the utilization of Matlab/SIMULINK® enables the realisation of a sophisticated virtual instrumentation system. A growing number of measurement as well as actuation devices used in technical applications increases the complexity of the measurement system. Therefore, simple, standardised, and low-cost components and standard software programs are desired for the implementation of the measurement system. In the paper at hand the application is a test bed for a 1:10 scaled railway vehicle car body, which has been built to investigate different concepts to suppress structural vibrations by active damping. In contrast to pure measurement applications the implementation of closed loop control schemes requires both actuators with suitable amplifiers and a fast and versatile realisation of the control unit. A software solution for a short development cycle from design to simulation and finally implementation of a control scheme is therefore necessary. In the remainder of the paper the test bed, the measurement and actuation devices, as well as the implementation in Matlab/SIMULINK® are described.