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发动机的声功率,一般是通过声压法测量,即先测出包围发动机的封闭曲面上各点的声压级,再求出声功率。这种测量法对测量场地的要求较高,通常测量工作应在消声室或半消声室内进行,不得不在现场测量时,需对环境作声学修正。 声强测量法是先测出封闭曲面上各点的声强级。再由声强级求出声功率。由于声强是矢量,在求声功率时可以消去封闭曲面外其他噪声源和壁面反射对测量结果的影响,能用于现场测量。
The sound power of the engine is generally measured by the sound pressure method. That is, the sound pressure level of each point on the closed curved surface surrounding the engine is measured first and then the sound power is calculated. This measurement method for measuring the site of the higher, usually the measurement work should be carried out in the anechoic chamber or semi-anechoic chamber, had to be measured at the scene, the need for acoustic correction of the environment. Sound intensity measurement method is to measure the sound intensity level of each point on the closed surface. Then by the sound level to find the sound power. As the sound intensity is a vector, when seeking the sound power, the influence of other noise sources and wall reflection on the measurement result outside the closed surface can be eliminated, and it can be used for field measurement.