【摘要】 在测试分析某轻型客车车内噪声特性的基础上,根据车内噪声主要峰值频率与发动机转速密切相关的特点,提出以发动机转速信号来构造车内有源消声系统初始次级声源参考信号的方法,研究基于该方法的车内有源消声控制策略和自适应控制算法,构建车内有源消声系统。通过对某轻型客车进行有源消声的试验研究表明,该系统结构简单、易于实现,并可显著降低由发动机振动和噪声辐射引起的车内低频噪声频谱中主要峰值处的噪声,在不同发动机转速下,使驾驶员耳旁噪声降低10dB(Lin)左右。更多还原

【Abstract】 According　to　the　close　correlation　between　dominant　noise　peak　value　frequency　in　vehicle and　engine　rotation　speed,　a　method　using　engine　rotation　speed　to　construct　reference　signal　of　the　initial　secondary　noise　source　of　an　active　noise　control　(ANC)　system　in　vehicle　is　proposed　on　the　basis　of　measuring　and　analyzing　interior　noise　characteristic　in　a　minibus.　Control　strategy　and　adaptive　algorithm　of　the　active　noise　control　system　is　studied.　Vehicle　interior　adaptive　active　noise　control　(AANC)　system　is　established　based　on　the　above　method.　The　active　noise　control　experiments　in　the　minibus　show　that　the　configuration　of　the　adaptive　active　noise　control　system　is　simple　and　easy　to　be　realized.　It　can　effectively　reduce　noise　amplitude　of　peak　value　points　in　vehicle　interior　low　frequency　noise　spectrum.　When　using　this　adaptive　active　noise　control　system　to　reduce　the　interior　noise　of　minibus,　under　different　engine　rotationspeeds,　the　noise　sound　pressure　level　around　the　driver’s　ear　positions　is　reduced　by　about　10dB(Lin).更多还原