摘要
为了避免换能器失谐带来的换能器发热、效率低等问题,提出一种模糊PD超声频率跟踪算法。模糊PD超声频率跟踪算法采用模糊控制的思想,使用指数法实时整定PD控制器的参数,以达到对谐振频率的快速、精确跟踪。模糊控制的输入为相角差和相角差变化率,模糊控制器按照预设规则识别换能器当前状态,并对增量式PD控制器的参数进行指数化整定,最终输出经过模糊PD调节后的驱动频率。仿真实验显示,该频率搜索算法能从任意频域开始,在30步内完成对任意超声换能器谐振频率的搜索。将该算法与二分法和PD变步长等算法比较,验证其在搜索准确率、搜索速度上的优越性,该算法适合于换能器谐振频率的搜索和全频域超声电源的设计。
In order to avoid the problems of transducer heating and low efficiency caused by transducer detuning,a fuzzy PD ultrasonic frequency tracking algorithm was proposed.The idea of fuzzy control was applied to fuzzy PD ultrasonic frequency tracking algorithm.The exponential method was used to set the parameters of the PD controller in real time to achieve fast and accurate tracking of the resonance frequency.The input of the fuzzy control was the phase difference and the rate of change of the phase difference.The fuzzy controller recognized the current state of the transducer according to preset rules,and set the parameters of the incremental PD controller exponentially.The driving frequency was the result of incremental PD adjustment.Simulation experiments show that the frequency search algorithm can start from any frequency domain and complete the search of the resonance frequency of any ultrasonic transducer in 30 steps.The algorithm is compared with algorithms such as dichotomy and PD variable step size to verify its superiority in search accuracy and search speed.It is suitable for the search of the resonant frequency of the transducer and the design of the full frequency domain ultrasonic power supply.
作者
练圣哲
王忠
LIAN Sheng-zhe;WANG Zhong(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《微特电机》
2021年第5期18-20,24,共4页
Small & Special Electrical Machines
基金
四川大学重大科研项目(17H0366)
四川省教育厅2018自然科学重点科研项目(18ZA0307,18ZA0308)。
关键词
超声频率跟踪
增量PD
模糊控制
频率搜索
换能器
ultrasonic frequency tracking
incremental PD
fuzzy control
frequency search
transducer
