摘要
蜂窝复合材料超声切割中，超声波电源与换能器的阻抗匹配失效导致材料的加工质量和加工效率极度降低，甚至损坏超声设备，实时、在线对阻抗角度进行检测，实现动态匹配是解决该问题的关键。在正交相关原理的基础上，提出了一种与采样是否同步无关的阻抗角度检测新方法，并采用微处理器及传感器测量电路实现了阻抗角的在线检测。仿真与实验均证明，该方法适用于超声频信号的同步与非同步采样，为实现动态匹配奠定基础，且计算量小、实时性强、测量精度高，改进后测量误差接近0．0551°。
During the ultrasonic cutting of the cellular composite, the failure of the match between ultrasonic and impedance of transducer leads to the reduce of the quality and efficiency of machining of materials, and even damages ultrasound equipment. The key to solve this problem is that realize the dynamic matching by detecting impedance angle on line and in real time. Based on the relevant principles of orthogonal, a new method to detect the impedance angle is proposed, which is independent with whether to synchronize with the sampling. And this way realizes the on-line detection of impedance angle by using the microprocessors and sensor measuring circuit. Simulation and experiments show that the method is suitable for synchronous and asynchronous sampling of ultrasound signal frequency and lays the foundation for the realization of dynamic matching. Besides, this method needs the small amount of calculation, is real-time and has high accuracy, and specially after the improvements, its error doses to 0. 0551°.
出处
《计量学报》
CSCD
北大核心
2016年第1期79-83,共5页
Acta Metrologica Sinica
基金
国家自然科学基金(51475130)
国防科工局重大专项(A3920133001)
关键词
计算学
超声换能器
阻抗匹配
阻抗角
正交相关原理
metrology
ultrasound transducer
impedance matching
impedance angle
orthogonal related principle
作者简介
纪华伟（1976-），男，山东寿光人，杭州电子科技大学副教授，博士，主要从事精密测量和特种加工研究。jhw76@163．com
