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緒言在車辆中傳播着空气噪音和固体噪音,消除噪音的方法是遏止其傳播。在这方面有消极的和积极的两种措施。所謂积极的措施是指控制噪音的发生,使之在空气中和固体中的輻射声最小。例如对机車柴油机、輔助机組、輪对、綫路等所采取的措施。消极措施是指将空气和固体中的噪音隔絕于客室之外,使其不能傳播,并經吸收而减少。由于隔音层的作用,使声音向客室的透射变为很困难。
Introduction The propagation of air and solid noise in vehicles eliminates the noise by stopping it from spreading. There are two negative and positive measures in this regard. The so-called positive measure refers to the control of noise, making it the lowest in the air and solid radiation. For example, locomotive diesel engines, auxiliary units, wheelsets, lines and other measures taken. Negative measures refer to isolating airborne and solid noise from the passenger room so that it can not spread and is reduced by absorption. Due to the effect of the sound barrier, it becomes very difficult to transmit the sound to the passenger compartment.