AN IMPROVED FREQUENCY TRACKING STRATEGY IN ULTRASONIC TRANSDUCER
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- 英文论文题名：AN IMPROVED FREQUENCY TRACKING STRATEGY IN ULTRASONIC TRANSDUCER
- 论文作者：Lang-te XU ; Xiao-qi ZHUANG ; Tian-yue YANG ; Ming YANG
- 英文论文作者：Lang-te XU ; Xiao-qi ZHUANG ; Tian-yue YANG ; Ming YANG ; Ming Yang's Laboratory ; School of Electronic Information and Electrical Engineering ; Shanghai Jiao Tong University
- 年：2016
- 作者机构：Ming Yang's Laboratory, School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University;
- 英文论文关键词：Fuzzy ; PID ; DDS ; Frequency tracking ; Ultrasonic transducer
- 会议召开时间：2016-10-21
- 会议录名称：2016年全国压电和声波理论及器件应用研讨会论文摘要集
- 英文会议录名称：Abstract Book of 2016 Symposium on Piezoelectricity, Acoustic Waves and Device Applications
- 语种：英文
- 分类号：TB552
- 学会代码：AGLU
- 会议名称：2016年全国压电和声波理论及器件应用研讨会
- 会议地点：中国陕西西安
- 主办单位：中国力学学会、中国声学学会、IEEE UFFC分会
- 学会名称：中国力学学会
- 页数：1
- 文件大小：106k
- 原文格式：D
- 会议级别：全国
摘要
Background, Motivation and Objective The realization of automatic frequency tracking is of great significance in ultrasonic transducer since its wide application area in nowadays industrial manufacture. However, excessive overshoot current, serious overheating or false tracking still remain the urgent issue. Based on the weakness of existing ultrasonic frequency tracking method, this paper proposes a novel hybrid technique that integrates fuzzy-PID control theory with direct digital synthesizer(DDS) on the system. The technique involves coarse adjustment by fuzzy control and accurate adjustment by PID. DDS is used to generate required PWM wave. Statement of Contribution/Methods Initial driving frequency of the system and its corresponding phase difference of the feedback voltage and current can both be acquired during sweep frequency test before the tracking process, which corresponds to the parallel resonant point where the current is the minimum. This phase difference is also regarded as the target tracking value. During the tracking process, fuzzy control will be adopted when phase difference value error between feedback value and target value is greater than 10%, or PID will be used. Current difference ?I and change rate ?I/?f are used as two input values while incremental driving frequency is the output value in fuzzy control when coarse adjustment is needed. Incremental PID arithmetic is used when accurate adjustment is needed. Results The result shows that the technique can reduce overshoot current of the ultrasonic transducer by approximately 8%, shorten the time for achieving stabilization of the system by 12%. Discussion and Conclusions In conclusion, this novel hybrid technique proposed in this paper can quickly and stably track the frequency of parallel resonant point of the ultrasonic transducer system; meanwhile keeps the whole system operating more efficiency and stable.
Background, Motivation and Objective The realization of automatic frequency tracking is of great significance in ultrasonic transducer since its wide application area in nowadays industrial manufacture. However, excessive overshoot current, serious overheating or false tracking still remain the urgent issue. Based on the weakness of existing ultrasonic frequency tracking method, this paper proposes a novel hybrid technique that integrates fuzzy-PID control theory with direct digital synthesizer(DDS) on the system. The technique involves coarse adjustment by fuzzy control and accurate adjustment by PID. DDS is used to generate required PWM wave. Statement of Contribution/Methods Initial driving frequency of the system and its corresponding phase difference of the feedback voltage and current can both be acquired during sweep frequency test before the tracking process, which corresponds to the parallel resonant point where the current is the minimum. This phase difference is also regarded as the target tracking value. During the tracking process, fuzzy control will be adopted when phase difference value error between feedback value and target value is greater than 10%, or PID will be used. Current difference ?I and change rate ?I/?f are used as two input values while incremental driving frequency is the output value in fuzzy control when coarse adjustment is needed. Incremental PID arithmetic is used when accurate adjustment is needed. Results The result shows that the technique can reduce overshoot current of the ultrasonic transducer by approximately 8%, shorten the time for achieving stabilization of the system by 12%. Discussion and Conclusions In conclusion, this novel hybrid technique proposed in this paper can quickly and stably track the frequency of parallel resonant point of the ultrasonic transducer system; meanwhile keeps the whole system operating more efficiency and stable.
Background, Motivation and Objective The realization of automatic frequency tracking is of great significance in ultrasonic transducer since its wide application area in nowadays industrial manufacture. However, excessive overshoot current, serious overheating or false tracking still remain the urgent issue. Based on the weakness of existing ultrasonic frequency tracking method, this paper proposes a novel hybrid technique that integrates fuzzy-PID control theory with direct digital synthesizer(DDS) on the system. The technique involves coarse adjustment by fuzzy control and accurate adjustment by PID. DDS is used to generate required PWM wave. Statement of Contribution/Methods Initial driving frequency of the system and its corresponding phase difference of the feedback voltage and current can both be acquired during sweep frequency test before the tracking process, which corresponds to the parallel resonant point where the current is the minimum. This phase difference is also regarded as the target tracking value. During the tracking process, fuzzy control will be adopted when phase difference value error between feedback value and target value is greater than 10%, or PID will be used. Current difference ?I and change rate ?I/?f are used as two input values while incremental driving frequency is the output value in fuzzy control when coarse adjustment is needed. Incremental PID arithmetic is used when accurate adjustment is needed. Results The result shows that the technique can reduce overshoot current of the ultrasonic transducer by approximately 8%, shorten the time for achieving stabilization of the system by 12%. Discussion and Conclusions In conclusion, this novel hybrid technique proposed in this paper can quickly and stably track the frequency of parallel resonant point of the ultrasonic transducer system; meanwhile keeps the whole system operating more efficiency and stable.
引文