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在降低机器噪声以及噪声控制工程的研究中,对于如何定量地描述噪声源所发射的噪声特性是非常重要的.过去,对机器设备噪声的强弱通常用一定距离处的声压级来表示,它与人的听觉可以直接联系起来,而且使用的测试仪器和方法都比较简单方便.然而,噪声源声压级的大小与测试房间的吸声、声源放置的位置以及测点离声源之间的距离等因素有关,所以它会受测试环境的影响.辐射一定声功率的某台机器,如果放在体积相同而室内总吸声不同的房间内,那未测
In the study of reducing machine noise and noise control engineering, it is very important to describe quantitatively the noise characteristics emitted by the noise source.In the past, the strength of the noise of the machine equipment is usually expressed by the sound pressure level at a certain distance, It is directly related to the human hearing, and the testing instruments and methods used are relatively simple and convenient.However, the size of the noise source sound pressure level and the sound absorption of the test room, the location of the sound source and measuring point away from the sound source Between the distance and other factors, so it will be affected by the test environment.A certain radiation power of a machine, if placed in the same volume and indoor total sound absorption of different rooms, then not measured