作者：陈创1, 李泽钦2, 吕海峰1, 张晏晴1, 马智宇1
作者单位：1. 中北大学机械工程学院，山西 太原 030051;
2. 河北工业大学理学院，天津 300401
关键词：俘获声能;流体能量;复合型换能器;正交实验;优化技术
摘要：
为了俘获环境中广泛存在的声能，提出一种双效应耦合作用的声电换能装置，该结构可在声电转换的同时捕获空气中的流体能量。为提高该装置的声电转化效率，对其进行优化设计。通过研究压电片不同连接方式对发电性能的影响规律，确定不同条件下系统的最优连接方式。采用正交实验法确定系统的最优组合方式，实验结果表明：在电阻大小2 MΩ、PZT材料的串联个数28个、PZT材料的总数56个、声源与换能器间的距离240 mm的组合方式下，系统输出功率最大。以最优组合设计实验，设置声压级为110 dB，噪声频率在247 Hz，此时测得负载输出电压17.54 V，输出功率307.65 μW，平均能量密度13.26 mW/m3。优化后的结构可作为微小型用电器的供电电源，在新能量领域有较好的应用前景。
Optimal design of a composite acoustic-electrical transducer
CHEN Chuang1, LI Zeqin2, Lü Haifeng1, ZHANG Yanqing1, MA Zhiyu1
1. School of Mechanical Engineering, North University of China, Taiyuan 030051, China;
2. School of Science,Hebei University of Technology, Tianjin 300401, China
Abstract: In order to capture the sound energy widely present in the environment, a double-effect coupling acoustic-electric transducer is proposed, which captures the fluid energy in the air while the acoustic-electrical conversion is proposed, which provides a new method for energy capture. In order to improve the acousto-electric conversion efficiency of this device, its design needs to be improved. The effects of varying attachment methods of the PZT piece on the power generation performance has been studied, and the optimal connection method of the system in different occasions was selected. The orthogonal analysis method was used to determine the optimal combination of the system, and the experimental results showed that the system output power was maximum under the combination of the resistance size of 2 MΩ, the number of PZT materials in series of 28, the total number of PZT materials of 56, and the distance between the sound source and the transducer of 240 mm. With the optimal combination design tests, the sound pressure level is set to 110 dB, the noise frequency is 247 Hz, and the voltage across the resistor is 17.54 V, the output power is 307.65 μW, and the average energy density is 13.26 mW/m3. The Optimized structure can be used as a power supply for micro and small appliances and has a wide range of applications in the field of new energy.
Keywords: capture of acoustic energy;fluid energy;composite transducer;orthogonal experiments;optimization techniques
2024, 50(4):102-108 收稿日期: 2022-09-28;收到修改稿日期: 2022-11-17
基金项目: 国家自然科学基金 ( 51305409)
作者简介: 陈创(1998-),男,山西运城市人,硕士研究生,专业方向为振动与噪声控制研究。
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