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Vibration energy harvesting technology is expected to solve the problem of self-powered wireless sensor nodes. By introducing nonlinear magnetic force，a magnetic coupling array piezoelectric energy harvester （MA-PEH） is designed in this paper. The nonlinear magnetic force model is established based on magnetic dipole method. The restoring force model of composite beam is obtained by finite element method. According to Newton’s second law and Kirchhoff’s law，the dynamic model of the system is established. The influence of excitation amplitude and excitation frequency on dynamic response is analyzed by simulation and verified by experiment. The results show that under the action of nonlinear magnetic force，the system appears chaos and periodic motion between wells near the resonant frequency，which can help to broaden the working frequency band of the energy harvester. As the excitation frequency changes，each composite beam always maintains the same motion state. When the system is in a periodic motion state between wells，only one type of beam is in a high-energy output state. When the excitation frequency is near the resonant frequency of the two beams，increasing the excitation amplitude will lead to the boosting of the output of one type of beam，while the output of the other type of beam will be suppressed. The research provides theoretical guidance for the design of array piezoelectric energy harvesters and new research ideas for improving the output performance of piezoelectric energy harvesters.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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