界面声波反射特性在船舶甲板装备噪声测试中的应用分析

针对船舶甲板大型装备噪声测试问题,根据声学原理论述了空气-液体、固体二类界面声波反射特性,当液体或固体横波声阻抗与空气声阻抗之比大于等于2000时,声波通过空气到液体或固体界面时,至少99.8%的声能量被反射。在此基础上,对船舶甲板大型装备噪声在陆地上与在船舶甲板上声场中声压级的差异进行了分析。

Study on Application of Acoustic Intersurface in Noise Measurement for Deck Equipment

In order to measure the noise of large deck equipments, this paper, studied that minimum values of sound reflection coefficients, sound reflection and total reflection conditions on two types for interfaces with air-liquid and air-solid using acoustic principle. When the ratio of acoustic impedance of liquid or solid to acoustic impedance of air is more than 2000, reflection energy of sound wave for the interfaces is more than 99.8 percent. The differences in sound pressure level of deck equipment noise between on land and on open deck of ships are analyzed on the basis of above conclusion.