In the piezoelectric vibration energy harvester, permanent magnets are often used to generate nonlinear applied magnetics force to improve the energy utilization rate of the system, the modeling analysis and accurate calculation of the force between magnets in the system is a difficult problem in the study of nonlinear bistable vibration energy harvesting. During the deformation of the cantilever beam, the direct force of the permanent magnet block can be divided into horizontal and vertical component forces. In most existing literatures analyzing such problems, the magnetizing current method magnetic force calculation model of double-stabilized electric beam mainly considers the influence of vertical magnetic force on the system of cantilever beam, and it is considered that the horizontal component of magnetic force has little influence on the vibration response of cantilever beam, but there is no detailed proof and elaboration of this problem. In this paper, the magnetic force, the effect of magnetic force on natural frequency and magnetic potential energy are calculated and simulated from three aspects. Through the comparison of results, it is proved that the effect of the horizontal magnetic force on the whole nonlinear piezoelectric beam vibration energy harvester can be ignored.

在压电振动能量采集器中，常使用永磁体来产生非线性施加的磁力，以提高系统的能量利用率，系统中磁体之间的力的建模分析和准确计算是研究振动的难题。非线性双稳态振动能量收集。在悬臂梁变形期间，永磁体块的直接力可分为水平和垂直分力。在分析此类问题的大多数现有文献中，双稳态电子束的励磁电流法磁力计算模型主要考虑垂直磁力对悬臂梁系统的影响，人们认为磁力的水平分量对悬臂梁的振动响应影响很小，但是对此问题没有详细的证明和阐述。本文从三个方面对磁力，磁力对固有频率和磁势能的影响进行了计算和仿真。通过比较结果证明，水平磁力对整个非线性压电梁振动能量采集器的影响可以忽略。