摘要
采用分布式PZT传感器在管中激励和接收超声导波。根据在管状波导中传播的超声波具有频散现象及多模态特征,选择具有单一频率的特定信号激励超声波,使其频散最小;同时采用分布式传感器抑制不同模态的波型。其试验结果与理论预测相吻合。
Using distributed PZT transducer, ultrasonic guided waves are generated and received in a pipe. Because multiple modes of guided wave propagation are possible in pipes and these modes are generally dispersive, the specific exciting signal of a Hanning windowed toneburst with a central frequency of 70 kHz is selected for decreasing the effect of dispersion. And guided wave are generated using 16 distributed PZT transducer in a circumferential direction for suppressing flex-ural modes. The experimental results are good agreement with the theoretical ones.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2004年第1期11-16,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金(19972003)
北京市自然科学基金重点项目(3011001)
教育部骨干教师资助计划
北京市教委科技合同资助项目
