FFTによるアクティブコントロ-ル制振装置

Abstract

Recently an active control method is investigated to reduce the vibration of structure. The active control system in using the FFT and the inverse FFT method is explained in this paper. As concerns an active control, the data which represents state of vibrating structure is inputted in a computer and then a computer calculates the control force, after that output the data of the control force. In this method, these processes have to be done continuously, not to cut off the flow of input data and output data. However, a computer can do only one thing at one time, so this control system adopts three methods: the direct memory access (DMA), the multi task system using a vector signal processor (VSP), and the pipeline array processing (PAP). This paper also includes experimental examination. Applying this control system to the simple beam model, the effect of reducing vibration and that characteristic are examined. In the experiment, it can be confirmed that the active control mentioned this paper has the excellent ability to reduce vibration.departmental bulletin pape