【摘要】：利用ANSYS中路徑映射方法將壓電陶瓷輻射超聲波的聲壓值分布映射到對(duì)應(yīng)的路徑上;通過(guò)改變路徑和角度,并提取數(shù)據(jù),分析在79k Hz頻率下埋入混凝土中的壓電陶瓷進(jìn)行超聲無(wú)損檢測(cè)時(shí)聲場(chǎng)聲能量特性的變化規(guī)律。研究結(jié)果表明:隨著壓電陶瓷輻射的聲場(chǎng)中擴(kuò)散角逐漸增加,散射區(qū)域增大,聲壓下降,聲能衰減均呈非線性變化,且半擴(kuò)散角為60°時(shí),聲能衰減速度相對(duì)較慢;隨著壓電陶瓷輻射聲波傳播的距離增大,最大聲壓和最小聲壓分布也在發(fā)生非線性變化,當(dāng)半徑大于0.09m時(shí),最大聲壓對(duì)應(yīng)的位置偏離主聲軸;當(dāng)路徑對(duì)應(yīng)的半徑小于0.08m時(shí),最小聲壓值對(duì)應(yīng)角度變化較小;當(dāng)路徑對(duì)應(yīng)的半徑大于0.08m時(shí),角度變化幅度比較大,大體上是在45°~61°范圍內(nèi)變化;等長(zhǎng)度地增加路徑對(duì)應(yīng)的半徑時(shí),超聲波的聲能并不是等量減小而是開(kāi)始時(shí)衰減最快,然后逐漸減小。
[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 擄, 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 擄~ 61 擄. 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.
【作者單位】： 四川大學(xué)電子信息學(xué)院;
【分類號(hào)】：O482.41

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