摘要
针对超声磨粒传感器的设计问题,利用时域KZK方程对超声传感器的声场进行数值模拟,分析传感器的关键参数如晶片半径、焦距和中心频率等对声场的影响。仿真结果表明:传感器的焦距越大,聚焦声场的声压越小、焦斑增大;随着传感器晶片半径的增大,焦斑区域先减小后变大,焦点声压先增加后降低;传感器中心频率越高,焦斑越小,声压先增后降。对比分析发现,KZK方程计算结果与传统经验公式的计算结果有较大差别,在磨粒传感器设计时应予以考虑。
Aimed at the design of online ultrasonic wear debris transducer, time-domain KZK equation was utilized to simulate the sound field of ultrasonic transducer. The relationship between the sound field and the key transducer parameters, i.e. the radius, the focal length and the center frequency of transducer was analyzed. The simulation results show that the sound pressure is decreased and the focal spot is increased with the increase of the focal length of transducer. Along the increasing of transducer radius, the sound pressure is increased first and then de- creased, while the focal spot changes in opposite trend. Along the increasing of the center frequency, the focal spot tends to be smaller, and the sound pressure is increased first and then decreased. There is a great difference between the calculation results of the KZK and the empirical for- mula, which should be considered when designing ultrasonic wear debris transducer.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第4期28-33,共6页
Lubrication Engineering
基金
国家自然科学基金项目(51205405)
关键词
在线磨粒监测
超声波传感器
KZK方程
online wear debris monitoring
ultrasonic transducer
KZK equation
