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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。
The distribution of sound pressure of the piezoelectric ceramic ultrasonic wave is mapped to the corresponding path by ANSYS path mapping method. The piezoelectric ceramic embedded in the concrete at 79k Hz frequency is analyzed by changing the path and angle and extracting the data. Variation of energy characteristics of sound field during nondestructive testing. The results show that as the diffusion angle increases, the scattering area increases, the sound pressure decreases, and the sound energy decays nonlinearly with the increase of the diffusion angle in the acoustic field of piezoelectric ceramics. When the half-diffusion angle is 60 °, the decay speed of acoustic energy is relatively The maximum sound pressure and the minimum sound pressure distribution are also changing nonlinearly. When the radius is larger than 0.09m, the position corresponding to the maximum sound pressure deviates from the main sound axis. When the radius corresponding to the path is less than 0.08m, the corresponding angle of the minimum sound pressure value changes little. When the radius corresponding to the path is larger than 0.08m, the amplitude of the angle is relatively large and generally varies from 45 ° to 61 °. To increase the radius corresponding to the path, the sound energy of the ultrasonic wave does not decrease by the same amount, but decays fastest when it starts, and then decreases gradually.