基于压电效应的随钻式能量回收装置设计

针对钻探领域中井下仪器的连续供电问题和钻杆纵向振动能量的回收问题，设计了一种基于正压电效应的新型随钻式能量回收装置。通过现场经验及地质调查报告，设计了装置的径向尺寸参数及压电片材料。基于COMSOL Multiphysics数值模拟软件建立压电耦合模型，通过强迫振动分析得出压电片的长度范围及最佳安装位置；通过模态分析与频率响应研究，得到压电悬臂梁固有频率在到达拐点厚度之前随压电片厚度单调递增，峰值电压随压电片厚度增加呈区域性变化等规律，压电片厚度为1.2~1.4 mm时发电性能最佳，装置峰值电压为15~40 V。该设计为压电式能量回收装置应用于钻探领域的探索提供了理论支撑和设计参考。

Design of piezoelectric effect-based energy recovery device wile drilling

Aiming at the problem of continuous power supply of downhole instruments and the recovery of longitudinal vibration energy of drill pipe in drilling field, a new type of energy recovery device based on positive piezoelectric effect was designed. The radial dimension parameters and piezoelectric materials were designed by field experiences and geological survey reports. The piezoelectric coupling model was established based on the numerical simulation software COMSOL Multiphysics, and the length range and the best installation position of the piezoelectric plate were obtained through forced vibration analysis. Through modal analysis and frequency response research, it is obtained that the natural frequency of the piezoelectric cantilever increases monotonically with the thickness of the piezoelectric sheet before reaching the thickness of the inflection point, and the peak voltage varies in a regional way with the thickness of the piezoelectric sheet. The generation performance is the best when the thickness of the piezoelectric sheet is 1.2-1.4 mm, and the peak voltage of the device is 15-40 V. It provides theoretical support and design reference for the application of piezoelectric energy recovery device in drilling field.