Introducing nonlinearity enables the generator to have wider bandwidth and higher power output compared to its linear counterpart. Due to the characteristics of nonlinear system, both high-energy and low-energy orbits coexist in the system while the low-energy orbit limits the available power. To attain the desired high-energy responses, a mechanism of two-step buckling level adjustment is applied to a nonlinear piezoelectric buckled beam generator for orbit jump in this paper. Two piezoelectric actuators are introduced into the generator to change the buckling level. Simulations and experiments reveal that not only adjustable buckling level can stimulate the high-energy orbit oscillations, but also increasing the buckling level in a certain range can push it in even-higher energy orbits for both mono-stable and bi-stable cases. The harvested power can be amplified for multifold times with single-frequency excitations. The method of buckling level adjustment opens opportunities for wide applications of nonlinear energy generators.

与线性同类产品相比，引入非线性可使发电机具有更宽的带宽和更高的功率输出。由于非线性系统的特性，系统中同时存在高能和低能轨道，而低能轨道限制了可用功率。为了获得所需的高能响应，本文将一种两步屈曲水平调节机制应用于非线性压电屈曲梁发生器，用于轨道跳跃。两个压电致动器被引入到发电机中以改变屈曲水平。仿真和实验表明，对于单稳态和双稳态情况，不仅可调节的屈曲水平可以激发高能轨道振荡，而且在一定范围内增加屈曲水平还可以将其推向更高的能量轨道。可以通过单频激励将采集到的功率放大多次。屈曲水平调整方法为非线性能量发生器的广泛应用打开了机遇。