Incorporating nonlinearities into the structures is extensively studied as an effective approach to increase the operation
band of the vibration generators. Two well-known ways of obtaining nonlinearities are utilizing magnetic interaction or
pre-stress effect, which brings considerable complexities for modeling and design, thus hindering the applications of the
nonlinear approach. The piece-wise generator presents a simple realization of nonlinearities with good robustness.
However, the available nonlinearities are limited to the combination of two linear segments of stiffness, which restricts
the performance of the harvesting device. In this paper, a new piece-wise generator is proposed with more possible
nonlinearities realization while keeping the advantages of simplicity and robustness. A prolonged curve fixture is
introduced instead of the stopper configuration in the normal piece-wise generator, making the stiffness nonlinearity with
more choice by selecting different curves of the fixture. Experimental and theoretical results show that the proposed
generator possesses much better performance than the regular piece-wise generator with effectively enhanced bandwidth
and resembled peak power.
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