功率超声系统负载的检测及模糊控制  

Load detection and fuzzy control in the power ultrasonic system

作　　者：曹群[1] 周兆英[1] 罗晓宁[1] 张毓笠[1] 

机构地区：[1]清华大学精仪系微机械,北京100084

出　　处：《光学精密工程》2002年第2期135-138,共4页Optics and Precision Engineering

基　　金：国家自然科学基金 (No .2 98330 70 )

摘　　要：功率超声医疗设备在治疗的过程中 ,为了取得良好的超声乳化效果 ,要求振动系统在不同的负载下都具有较大的输出振幅 ,这就要求振动系统在不同的负载下都工作在匹配状态下。文章首先分析了纵向复合棒大功率换能器加接变幅杆和刀具的振动系统的等效机电模型 ,然后根据等效机电模型分析了功率超声振动系统动态阻抗匹配的基本原理。同时针对功率超声系统的工作特点设计了一种动态负载在线检测方法 ,得到反映负载状态及其变化趋势的参数 ,并根据识别出的动态负载确定出模糊控制器的输入输出参数。最后给出了一种实用的模糊控制算法进行振动系统的动态阻抗匹配。实验结果表明 。To acquire approved ultrasonic emulsification effects while using the power ultrasonic medical treatment instrument to cure patients, an ultrasonic vibration system is always needed to operate at a high vibration amplitude under different load conditions and to work in the electormechanical matching state under all load conditions. Firstly, the paper focuses on the equivalent electromechanical model to the power ultrasonic vibration system made up of a longitudinal composite_bar high_power transducer, a horn and a scalpel. Secondly, depending on the model, it analyzes the fundamental principles of dynamic impendence matching in the power ultrasonic vibration system. At the same time, according to the operating characteristics of the system, an approach to dynamic impedance on_line detecting has been devised and the parameters reflecting load state and change trend are obtained. Based on the identified dynamic load, the input and output parameters of the fuzzy controller can be determined.Finally, it presents an applied fuzzy control algorithm, which can be used as a dynamic impedance matching approach for the power ultrasonic vibration system. The experiment results show that when the power ultrasonic vibration system operates at the state of dynamic impedance matching by using the fuzzy control technique, the system can always have high electric power and good effects of the ultrasonic emulsification under the changing load.

关 键 词：模糊控制 阻抗匹配 负载检测 医疗设备 振动系统 功率超声系统 

分 类 号：TH77[机械工程—仪器科学与技术]