MFC在水中摆动时输出开路电压幅值研究

利用柔性压电材料从流体的流动中获取能量已成为一个研究热点。该文研究了一种压电纤维复合材料(MFC)在水中摆动激励下的压电特性,建立了MFC压电纤维片在水中摆动激励下的数学模型,并结合MFC压电纤维片的压电输出机理得出影响MFC压电纤维片输出开路电压幅值大小的因素。最后设计搭建了MFC压电纤维片在水中摆动的试验台,利用该试验台验证了模型的正确性,并研究了MFC压电纤维片在不同摆动频率下的压电特性。结果表明,在摆角幅值为10°,摆动频率为1.75 Hz时,MFC的输出开路电压幅值取得最大值(600 mV),继续增大摆动频率,输出开路电压幅值逐渐减小。

Study on Output OpenCircuit Voltage Amplitude of MFCSwinging in Water

Using flexible piezoelectric materials to obtain energy from fluid flow has become a research hotspot. In this paper, the piezoelectric characteristics of a kind of piezoelectric fiber composite(MFC) excited by swinging in water are studied. The mathematical model of MFC piezoelectric fiber sheet under water swing excitation is established. Combined with the piezoelectric output mechanism of MFC piezoelectric fiber sheet, the factors influencing the output opencircuit voltage amplitude of MFC piezoelectric fiber sheet are obtained. Finally, a test bed for the MFC piezoelectric fiber sheet to swing in water is designed and built. The correctness of the model is verified by the test bed, and the piezoelectric characteristics of MFC piezoelectric fiber sheet under different swing frequencies are studied. The results show that when the swing angle amplitude is 10° and the swing frequency is 1.75 Hz, the output open circuit voltage amplitude of MFC piezoelectric fiber sheet reaches the maximum value of 600 mV. When the swing frequency continues to increase, the output open circuit voltage amplitude gradually decreases.