标题：
Parallel resonant frequency tracking based on the static capacitance online measuring for a piezoelectric transducer
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所属单位：
航空学院
发表刊物：
SENSORS AND ACTUATORS A-PHYSICAL
关键字：
Parallel frequency track Piezoelectric transducer Static capacitance
摘要：
Piezoelectric transducers working series resonant frequency (SRF) may suffer damage due to the overheat of the piezoelectric device caused by the large current. It is especially severe when the load value is large and changes fast. On the other hand, it is proved that a transducer enjoys a load-based self adjustable output power when operating under its parallel resonant frequency (PRF). To take advantage of such feature and avoid the damage at SRF, a method of PRF tracking was proposed based on the online measurement of static capacitance. First, the relationship between the output power and load was derived based on the parallel equivalent circuit. Then, a target impedance value was defined and tracked as the flag of PRF. It shared the same changing rules as that of total equivalent impedance with respect to working frequency. The variable-step frequency sweeping method was improved to find PRF in less than 1 s and the error is less than 1 Hz. The proposed method monitored the static equivalent capacitance in real time since the capacitor always changes irregularly with the working condition. Also, the self-unlock mechanism was added to eliminate local optimum. The experimental results based on the proposed methods agreed with the theoretical analysis, which indicated the potential of the proposed method in practice. (C) 2017 Elsevier B.V. All rights reserved.
ISSN号：
0924-4247
是否译文：
否
发表时间：
2018-02-01
合写作者：
Di, Sisi
通讯作者：
李华峰
发表时间：
2018-02-01
学位：工学博士学位
职称：教授
所在单位：航空学院