电磁式振动能量采集器（EMH）是一类重要的振动能量采集装置，发挥其最佳的能量转化效果，有赖于谐振频率的把握以及结构参数的优化。有鉴于线性振子的带宽有限，而强扰动量作用下非线性EMH的研究方法还有待完善，因此本课题以一类薄膜结构EMH为对象开展研究工作。通过建立相应的强非线性理论体系，准确把握强扰动因素对于谐振频率的影响，拓展频带宽度；开展结构优化，提高输出功率。内容包括：考虑空气阻尼、非线性刚度、磁场力等因素，建立非线性振子的连续体模型；提出研究薄膜振子大幅强非线性振动特性的动态频率方法，充分考虑系统中非线性因素对于谐振频率的影响；发展高阶能量平衡法，应对不同激励形式开展非线性理论分析，探索拓展频带宽度、跟踪外界频率变化所需的参数调节机制；改进磁通量同步提取技术，形成非线性EMH的整体参数优化准则，发挥采集器的结构潜能；通过理论与实验相结合的形式，验证设计思路与研究方法的可行性。

The electromagnetic vibration energy harvester (EMH) is one of the most important vibration energy harvesting devices. The procedure to enhance its energy conversing performance requires a deep insight into the resonant frequency and the optimization strategy of the structure parameters. The limitation of bandwidth is the main problem for the linear energy harvester. The limitation of the nonlinear methodology in dealing with the strong perturbation is the main problem for the nonlinear harvester. So, in this proposal, we try to introduce the corresponding strongly nonlinear theory on widening the bandwidth by accurately calculating the resonant frequency, and strengthening the power output by operating structure optimization of a membrane type EMH. Firstly, a continuum model is established according to the membrane large deflection theory to match the strongly nonlinear oscillation characteristics of the oscillator. Meanwhile, the air damping, nonlinear rigidity and magnetic force are concerned as the necessary components to this model. Secondly, the resonance frequency and the steady-state response of the oscillator are calculated by using the new dynamical frequency method to fully concern the strong perturbations embodied in the system. Thirdly, the nonlinear turning mechanism referring to certain physical parameters is investigated through the local and global bifurcation analysis. It helps to broaden the bandwidth and track the varying excitation frequency in operation. The higher-order energy balance method is introduced to improve the accuracy of computation. Fourthly, the Synchronous Magnetic Flux Extraction (SMFE) technique is improved to design the extraction circuit. According to SMFE, the power optimization principle of the nonlinear EMH is achieved, which addresses the key issue for structure optimization and exploits the potentialities of the architecture. Finally, following the theoretical findings and optimization strategies, the EMH experiments are carried out to improve the harvesting performance and verify the parameter turning strategies. Further attentions will be paid to maintain the sequential implement and sustainable development within this architecture.