基于路径映射的埋入混凝土中PZT声能特性分析
发布时间：2018-12-23 08:22
【摘要】：利用ANSYS中路径映射方法将压电陶瓷辐射超声波的声压值分布映射到对应的路径上;通过改变路径和角度,并提取数据,分析在79k Hz频率下埋入混凝土中的压电陶瓷进行超声无损检测时声场声能量特性的变化规律。研究结果表明:随着压电陶瓷辐射的声场中扩散角逐渐增加,散射区域增大,声压下降,声能衰减均呈非线性变化,且半扩散角为60°时,声能衰减速度相对较慢;随着压电陶瓷辐射声波传播的距离增大,最大声压和最小声压分布也在发生非线性变化,当半径大于0.09m时,最大声压对应的位置偏离主声轴;当路径对应的半径小于0.08m时,最小声压值对应角度变化较小;当路径对应的半径大于0.08m时,角度变化幅度比较大,大体上是在45°~61°范围内变化;等长度地增加路径对应的半径时,超声波的声能并不是等量减小而是开始时衰减最快,然后逐渐减小。
[Abstract]:Using the path mapping method in ANSYS, the acoustic pressure distribution of ultrasonic wave radiated by piezoelectric ceramics is mapped to the corresponding path. By changing the path and angle, and extracting the data, the variation of acoustic energy characteristics of acoustic field in the ultrasonic nondestructive testing of piezoelectric ceramics embedded in concrete at 79k Hz frequency is analyzed. The results show that with the increase of diffusion angle, the scattering area increases, the sound pressure decreases, and the attenuation of sound energy is nonlinear. When the semi-diffusion angle is 60 掳, the attenuation rate of sound energy is relatively slow. The maximum sound pressure and the minimum sound pressure distribution also change nonlinearly with the increase of the distance of acoustic wave propagation. When the radius is greater than 0.09 m, the corresponding position of the maximum sound pressure deviates from the main acoustic axis. When the radius of the path is less than 0.08m, the corresponding angle of the minimum sound pressure is smaller, and when the radius of the path is larger than 0.08m, the range of angle change is larger, which is in the range of 45 掳~ 61 掳. When the radius of the path is increased at the same length, the sound energy of the ultrasonic wave does not decrease by the same amount, but the attenuation is the fastest at the beginning and then decreases gradually.
【作者单位】： 四川大学电子信息学院;
【分类号】：O482.41
[Abstract]:Using the path mapping method in ANSYS, the acoustic pressure distribution of ultrasonic wave radiated by piezoelectric ceramics is mapped to the corresponding path. By changing the path and angle, and extracting the data, the variation of acoustic energy characteristics of acoustic field in the ultrasonic nondestructive testing of piezoelectric ceramics embedded in concrete at 79k Hz frequency is analyzed. The results show that with the increase of diffusion angle, the scattering area increases, the sound pressure decreases, and the attenuation of sound energy is nonlinear. When the semi-diffusion angle is 60 掳, the attenuation rate of sound energy is relatively slow. The maximum sound pressure and the minimum sound pressure distribution also change nonlinearly with the increase of the distance of acoustic wave propagation. When the radius is greater than 0.09 m, the corresponding position of the maximum sound pressure deviates from the main acoustic axis. When the radius of the path is less than 0.08m, the corresponding angle of the minimum sound pressure is smaller, and when the radius of the path is larger than 0.08m, the range of angle change is larger, which is in the range of 45 掳~ 61 掳. When the radius of the path is increased at the same length, the sound energy of the ultrasonic wave does not decrease by the same amount, but the attenuation is the fastest at the beginning and then decreases gradually.
【作者单位】： 四川大学电子信息学院;
【分类号】：O482.41
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