基于压电自供电的采煤机状态无线监测装置

考虑到压电自供电装置中压电振子的几何参数直接影响其共振频率，从而影响压电自供电装置的发电量，因此需要根据环境激励频率设定最佳的压电振子的几何参数，本文对基于压电自供电的采煤机状态无线监测装置进行研究，通过理论分析、仿真以及实验方法对对不同悬臂梁结构在不同外界激励作用下的发电量进行研究。研究结果表明：悬臂梁自由端质量块质量以及悬臂梁长度越大，悬臂梁压电结构的固有频率越低；随着悬臂梁厚度的增加，悬臂梁压电结构的固有频率逐渐增大。以此为依据对采煤机不同监测位置的装置选取最佳匹配的压电结构几何参数，并通过采煤机工作状态监测实验验证了本文研究的压电自供电无线监测装置的可行性。

Wireless monitoring device for coal mining machine based on self powered piezoelectric

Considering the geometric parameters of the piezoelectric self powered device of piezoelectric vibrator directly affects its resonance frequency, thus affecting the generation of piezoelectric self powered devices, so according to the geometric parameters of ambient excitation frequency setting of piezoelectric vibrator best, this paper based on piezoelectric self powered wireless monitoring device of coal mining machine the state, through theoretical analysis, simulation and experimental methods of different cantilever structure under different excitation power generation under the action of. The results show that the free end of the cantilever beam mass and cantilever length increasing, the natural frequency of the piezoelectric cantilever structure is low; with the increase of the thickness of the cantilever beam, the natural frequency of the piezoelectric cantilever structure shows an increase after decrease. In order to select the optimum geometric parameters of piezoelectric structures, on the basis of different shearer position monitoring device, and this paper studies the feasibility of piezoelectric self powered wireless monitoring device is verified by shearer working state monitoring experiment.