本文選題：聲學(xué)測量 + 波形擬合　； 參考：《中國測試》2016年12期

【摘要】：為消除水聲材料在低頻測量時邊界反射波對接收信號的干擾,通過縮短發(fā)射信號的傳播距離來提高直達(dá)波與反射波的聲程差,得到一段有效的單一直達(dá)波。用Matlab擬合這段單一直達(dá)波,得到一個完整周期的波形,讀取其幅值作實驗數(shù)據(jù)。該實驗在一尺寸為4 m×1.4 m×1.1 m的鋼體水箱中進(jìn)行,水深0.8 m。試樣為一外徑30 cm,厚1 cm的空心玻璃鋼圓管,測量頻率為8~30 k Hz。對有無試樣兩種情況下完成測量后進(jìn)行透射系數(shù)計算,得到試樣的插入損失。實驗結(jié)果表明:測量值相對誤差均小于10%,測量結(jié)果的不確定度5%,測量值與理論值具有較好的一致性,證明該方法的有效性。本方法適用于非自由聲場環(huán)境下材料聲學(xué)參數(shù)的測量,具有簡單、快速、有效的特點,對大試樣材料的水聲性能測量有一定的實用價值。
[Abstract]:In order to eliminate the interference of the boundary reflection wave on the received signal in the low frequency measurement of underwater acoustic material, the acoustic range difference between the direct wave and the reflected wave is increased by shortening the propagation distance of the transmitted signal, and an effective single direct wave is obtained. A complete period waveform is obtained by fitting the single direct wave with Matlab, and the amplitude of the wave is read as experimental data. The experiment was carried out in a steel tank of 4 m 脳 1.4 m 脳 1.1 m with a water depth of 0.8 m. The sample is a hollow FRP tube with an external diameter of 30 cm and a thickness of 1 cm. The measuring frequency is 830 kHz. The transmission coefficient of the sample is calculated after the measurement is completed, and the insertion loss of the sample is obtained. The experimental results show that the relative errors of the measured values are less than 10, the uncertainty of the measurement results is 5, the measured values are in good agreement with the theoretical values, and the validity of the method is proved. This method is suitable for the measurement of acoustic parameters of materials in non-free sound field. It is simple, rapid and effective, and has certain practical value for the measurement of underwater acoustic properties of large sample materials.
【作者單位】： 中國計量大學(xué)計量測試工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(11474259)
【分類號】：TB564

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