This paper compares our analog and digital self-powered systems for vibration suppression, and shows experimental results of\r\nmultimodal vibration suppression for both self-powered systems. The experimental results are evaluated in light of the damping\r\nperformance and adaptability under various vibrational conditions.We demonstrate various examples of our innovative vibration\r\nsuppression method, called ââ?¬Å?digital self-powered.ââ?¬Â Proper status switching of an electric circuit made up of an inductor and a\r\nselective switch connected to a piezoelectric transducer attenuates the vibrations. The control logic calculation and the switching\r\nevents are performed with a digital microprocessor that is driven by the electrical energy converted from the mechanical vibration\r\nenergy. Therefore, this vibration suppression system runs without any external power supply. The self-powering feature makes\r\nthis suppression method useful in various applications. To realize an ideal vibration suppression system that is both self-powered\r\nand effective in suppressing multimode vibration, sophisticated control logic is implemented in the digital microprocessor. We\r\ndemonstrate that our digital self-powered system can reduce the vibrational displacements of a randomly excited multimodal\r\nstructure, by as much as 35.5%.
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