求翻译：该方法视消声元件与发动机连接处为声源出口，提取发动机进、排气噪声的声源特性，即声源的幅值、阻抗值(将此过程称为“声源特性的提取”)，再根据下游消声元件的特性，计算接口处的实际声压值，将此值作为边界条件计算发动机的进气口或排气尾管的噪声值。是什么意思？

The method, as the muffler and engine components for the source junction export, extract the engine intake and exhaust noise of the sound source characteristics, that is, the amplitude of the sound source, the impedance values ​​(this process is called "source feature extraction") , according to the

Depending on the method with engine noise reduction components connected to the sound source to export, extract engine exhaust noise, the sound source, that is characteristic of the acoustic source, impedance value in this process is known as "value (the sound source of identity, and then extract")

This method regards the noise elimination part and the engine attachment point is the acoustic source exportation, withdraws the engine to enter, the exhaust noise acoustic source characteristic, namely the acoustic source peak-to-peak value, the resistance value (are called this process “acoustic s

The method depending on anechoic components and engine connection Department for sound source export, extraction engine into, and exhaust noise of sound source characteristics, is sound source of site value, and impedance value (will this process called "sound source characteristics of extraction"),

The method depending on anechoic components and engine connection Department for sound source export, extraction engine into, and exhaust noise of sound source characteristics, is sound source of site value, and impedance value (will this process called "sound source characteristics of extraction"),