基于路径映射的埋入式压电陶瓷辐射声能特性研究  

Research on Radiated Sound Energy Characteristics of Piezoelectric Ceramics Embedded in Concrete Based on Mapping Results onto a Path

作　　者：姜敏[1] 陈雨[1] 邓洪敏[1] 赵爱荣[1] 李鹏[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《传感技术学报》2016年第4期614-621,共8页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学青年基金项目(50808186);重庆市自然科学基金项目(CSTC;2008BB0155);国家自然科学基金项目(61174025)

摘　　要：将压电陶瓷埋入混凝土构成压电埋入式机敏模块能够实现对混凝土结构在线健康监测。为了提高检测的准确性,本文基于路径映射技术对压电陶瓷辐射超声波在混凝土中传输时的声能特性进行研究。研究表明:随着激励频率增大,压电陶瓷辐射声波能量衰减速度减慢,且当激励频率为79 k Hz时,更为适合进行压电埋入式超声无损检测实验。随着超声波传播距离增大,扩散范围越广,声压下降速度和声能衰减速率呈非线性变化。在同一激励频率下,不同路径上的最大声压值和最小声压值分别对应不同的位置:当映射路径的半径小于0.08 m时,最大声压值在厚度方向,最小声压值对应的角度在54到58.5之间;当路径的半径大于0.08 m时,最大声压值对应的角度由于厚度方向与径向方向波的部分重叠而偏离轴向处,而最小声压值对应的角度在45°到61°之间。Embedding the piezoelectric ceramic into concrete can form piezoelectric embedded typed alert module,which can implement on-line health monitoring of the concrete structure. To improve the accuracy of the monitoring,this thesis has down research on the characteristics of acoustic energy when piezoelectric ceramic radiant ultrasonicis transmitting in concrete based on Mapping Results onto a path technology. Experiments showed that with the in-creasing of excitation frequency,the energy attenuation speed of piezoelectric ceramic radiant acoustic wave willslow down. What＇s more,the situation that excitation frequency equals to 79 kHz is the more suitable to do thepiezoelectric embedded typed ultrasonic nondestructive testing experiment. With the increasing of propagation dis-tance and diffusion range of ultrasonic,descent speed of sound pressure and decay rate of sound energy will be vary-ing non-linear. Under the same excitation frequency,the maximum and the minimum sound pressure value in differ-ent path will respectively correspond to different positions. When the radius of mapping path is less than 0.08 me-ters,the maximum sound pressure value is in the direction of thickness,and angles that the minimum sound pres-sure value corresponding to is between 54 and 58.5. On the other side,when the radius of mapping path is greaterthan 0.08 meters,the angle that the maximum sound pressure value corresponding to deviates,the axial directioncaused by the overlapping of the thickness direction and radial direction. And the angles that the minimum soundpressure value corresponding to is between 45 and 61.

关 键 词：压电陶瓷 声能特性 路径映射 激励频率 超声波 混凝土 

分 类 号：O482.41[理学—固体物理]