Internal Structure of Automotive Mufflers?
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The internal structure of an automotive muffler consists of a set of pipes designed to create constructive or destructive interference of reflected waves. When exhaust gases and sound waves generated by the engine operation enter the central pipe and are reflected back from the rear wall of the muffler, they reach the main body of the muffler through perforations. These waves then pass through another set of perforations into a secondary chamber where transformation occurs, before exiting through the final pipe and leaving the muffler. A resonator connected to the first chamber via perforations contains a specific volume of gas and has a defined length to generate waveforms that cancel out specific sound frequencies. To reduce the impact and hazards of noise pollution on human life, all vehicles must be equipped with mufflers. Automotive mufflers, also known as silencers, can be classified into three types based on their working principles and structures: reactive mufflers, absorptive mufflers, and impedance compound mufflers.