不知道你是否有这样的体验，即使关紧车窗，车内的噪音还是很大。
有人在网上提问：为什么坐在豪华车内会感觉更加静谧呢？
汽车的降噪是一个系统的，复杂的工程，难以用一篇文章就说明白。今天造车小将就来跟大家说一说车上的一个降噪“神器”。
汽车的车身是由很多钣金焊接而成，钣金与钣金之间存在空腔，很多空腔都是与外界相连的，这些空腔就成了噪音传递到车内的路径。
为了切断这个噪音传播的路径，汽车攻城狮们在钣金腔体内嵌入了发泡材料，这种特殊的材料在受热的情况下就会膨胀，从而把空腔与外界隔绝起来，这样进入车内的噪音自然就少了。
图片为车身剖开后看到的填充在腔体内的发泡件
当然，像这种使用发泡材料使车子尽可能的密封，使噪音进不来，只是降低噪音的一种方式，其它的降噪方式以后有机会再跟大家分享。
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