车内自适应有源消声系统次级声源布放试验

在构建车内双次级声源有源消声系统的基础上,对系统中次级声源的布放进行了试验研究,分析了双次级声源的布放、次级声源与误差传声器的相对位置对车内消声区域和消声效果的影响,确定了次级声源和误差传声器的合理布放方案。研究表明,当误差传声器与次级声源的数目相同、误差传声器位于次级扬声器的中心线上,且与次级声源相距200 mm左右时消声效果最好。讨论了不同车型车内次级声源和误差传声器布置的可行性,给出了客车、货车和轿车车内次级声源和误差传声器布放的合理方案,可为多次级声源车内有源消声系统的设计提供参考。

Layout Experiment of Secondary Sound Source for Adaptive Active Noise Control System in Vehicle Interior

A vehicle interior dual-secondary sound source adaptive active noise control(AANC) system was established.The layout experiment of secondary sound source for two-channel AANC systems was carried out.The influence of secondary sound source layout and their relative locations with error microphones on noise attenuation effect and cancellation zone was analyzed.The reasonable layout of secondary sound source and error microphones was determined.Results indicate that noise attenuation effect of the AANC system reaches best when the amount of error microphone is equal to secondary sound source and the error microphones are about 200 millimeters apart in center of secondary loudspeaker.Layout feasibility and scheme of secondary sound source and error microphones in passenger cars,buses and trucks were discussed further.The above studies provide a basis for design of multiple secondary sound source AANC system in vehicle interior.