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对四冲程柴油机 ( 4 - 85)的排气噪声的机理和特性进行了研究 ;利用波形合成的原理 ,控制高速信号处理芯片 TMS32 0 C2 5合成次级声源的声波 ,可以实现宽带消声 .对柴油机的排气噪声进行了有源消声的初步设计
The mechanism and characteristics of the exhaust noise of a four-stroke diesel engine (4 - 85) are studied. By using the principle of waveform synthesis, the sound waves of the secondary sound source synthesized by the high-speed signal processing chip TMS32 0 C2 5 can be controlled and broadband noise reduction can be realized. The preliminary design of active noise reduction was carried out on the exhaust noise of diesel engine