Abstract
This paper presents an experimental investigation on the bistable piezoelectric electromagnetic combined energy harvester based on vibration. The end of the piezoelectric cantilever beam has a tip magnet. The opposite of the piezoelectric cantilever beam has a coil, a spring and a magnet. The power generation efficiency and dynamic behaviors for three different kinds of the piezoelectric cantilever beam structures are experimentally studied, such as the conventional piezoelectric cantilever beam, the bistable piezoelectric cantilever beam introduced spring and magnet, and the bistable piezoelectric cantilever beam introduced spring, magnet and coil. Experimental results show that the introduction of the spring and magnet improves the maximum output voltage and broaden the effective frequency bandwidth. The power generation efficiency of the system is improved by adding the coil. Complicated nonlinear dynamic behaviors occur in the system, when the spring and the magnet are introduced. These nonlinear dynamic behaviors broaden the effective frequency bandwidth.
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