论文部分内容阅读
一、发展简述 有源消声器也称电子消声器。它的基本思想是在噪声场中,用电声器件和电子设备,产生一个与原来的声压大小相等、位相相反的声波,使在一定区域内与原来的声场相抵消。 Paul Lueg在这方面进行了开拓性的工作。他在1934年提出了一个专利,他应用声波叠加原理,对几种可以实现有源消声的情况作了清楚的说明。其一是管道中的声波,参看图1,设管道中有正弦波S_1传播,如果用传声器M接收这一声波,经放大器V到扬声器L,再向管中辐射正弦波S_2,倘若调节
First, the development of an active muffler, also known as electronic muffler. Its basic idea is that in the noise field, electroacoustic devices and electronic equipment are used to generate an acoustic wave of the same magnitude and opposite phase as the original sound pressure so as to cancel out the original sound field in a certain area. Paul Lueg pioneered this area. He filed a patent in 1934, he applied sound wave superposition principle, made clear on several situations that can realize active noise reduction. One is the sound waves in the pipeline, see Figure 1, suppose there is a sine wave S_1 propagation in the pipeline, if this sound wave is received by the microphone M, amplified by the amplifier V to the loudspeaker L, then radiated sine wave S_2 to the pipe,