Nonlinear energy harvesters have already been exhibited to draw energy from ambient vibration owing to their particular dynamic characteristics, and are feasible to desirable responses for broadband excitations of bistable and monostable systems. This study proposes an energy harvester for rotational applications, in which a cantilever beam pasted piezoelectric film and magnets with the same polarity are comprised as a nonlinear vibrating system. As the rotationally angular velocity gradually increases, the tensile stress to the cantilever beam is also self-adjusted with the increscent centrifugal force, causing the potential barriers of bistable type become shallow, so that the cantilever beam has the ability to maintain the high energy orbit motion from bistable hardening type to monostable hardening behavior. From the implemented results, the valid bandwidth of angular frequency can be improved from 26 rad/s - 132 rad/s to 15 rad/s - 215 rad/s, under the case of the effect of centrifugal force on nonlinear vibrating behavior. It demonstrates that the centrifugal force can significantly promote the performance of nonlinear energy harvesters.
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机译：由于其特定的动态特性，已经表现出非线性能量收割机以从环境振动中提取能量，并且对双稳态和单稳态系统的宽带激发的理想响应是可行的。该研究提出了一种用于旋转应用的能量收割机，其中悬臂束粘贴的压电薄膜和具有相同极性的磁体被构成为非线性振动系统。随着旋转角速度逐渐增加，悬臂梁的拉伸应力也通过矩阵离心力进行自调节，导致双稳态型势垒变浅，使得悬臂梁具有维持高能轨道的能力从双稳态硬化类型移动到单稳态硬化行为。从实现的结果，在离心力对非线性振动行为的影响的情况下，可以从26 rad / s-132 rad / s到15 rad / s-215 rad / s的角度频率的有效带宽。它表明离心力可以显着促进非线性能量收割机的性能。
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