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7. Active Vibration Control

スマートセンサーを取り付けた実験装置、制御の有無とクラドニ図

7. Active Vibration Control
　　Active control of structural vibration continues to be a topic of extensive research activity. It is well known that the vibration modes of any structure largely determine the characteristics of the structure-borne noise it emits when excited. The phenomenon of noise radiation can be complicated as well as intriguing. Structure-borne noise is not always reduced, when vibration is suppressed, but sometimes even increased.
　　Vibration modes are classified into two categories; good modes with low radiation efficiency and bad modes with high radiation efficiency. This project is aimed at developing a distributed parameter smart sensor made of a PVDF film, which is able to sense only the combination of bad vibration modes. Once the smart sensor is implemented into a control system, the structure-borne noise can be always suppressed by reducing the smart sensor output.

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