【摘要】 提出一种定质量分数交变气体载荷激励的盘型压电阵列发电机,设计了盘型压电阵列发电机的样机结构并对压电阵列的工作原理进行了分析,理论分析结果表明盘型压电片具有良好的承载能力,适合对具有较高压力的气体能量进行收集,压电发电量是由气体压缩过程中的体积压缩量、压缩速度、供气压力、周期及流量等多种要素共同决定的。对盘型压电片进行了有限元仿真分析,分析结果表明盘型压电片适合对高压气体载荷进行能量收集与转换,压电材料的微小变形就可输出较大的电压。采用外径为12 mm、厚度为0.2 mm的压电单晶片及缸径为63 mm、行程为150 mm的气缸设计了实验样机,利用气动组件来模拟气体环境搭建测试系统。分别调节压力、周期、流量等参数进行了实验测试。实验结果表明,当压力固定时,随着流量的增加峰值电压逐渐升高,盘型压电片并联式具有较好的效果,当5片压电片并联时最佳匹配电阻为3 MΩ且最大的瞬时功率为6.53μW,输出功率可满足低功耗传感器的能量需求。更多还原

【Abstract】 A piezoelectric plate array energy harvester was proposed,which was excited by constant mass compressed gas,and the alternate high air pressure can be recovered. The structure of the system and working principle of the presented harvester were introduced,and the theoretical and experiment were analyzed. The theoretical analysis results showed that the piezoelectric plate had high bearing capacity and it can collect the compressed gas energy effectively. The piezoelectric harvester was subjected by various parameters such as compression volume and compression speed. The expected effect can be adjusted by changing different parameters. The diameter and thickness of piezoelectric unimorph were12 mm and 0. 2 mm,respectively. The diameter and distance of cylinder were 63 mm and 150 mm and the prototype were fabricated. The test system was built to research the rules and performances of piezoelectric array energy harvester. In the test, the pressure, cycle and flow were adjusted.Experimental results showed that the output voltage was simultaneously increased with the increase of flow when the pressure was fixed. With the increase of parallel number of piezoelectric plates,the output power was increased either. It had optimal effect when the five piezoelectric plates were parallel connected. The optimal load resistance was 3 MΩ and instantaneous power was 6. 53 μW under the five piezoelectric plates parallel.更多还原