【摘要】 选择4款在重庆市主城区具有典型代表性的中型在用公交车进行市区行驶条件下的空载噪声试验,测定其车内噪声水平。结果表明,受发动机转速和车速的影响,同一车辆不同路段噪声水平大小顺序为上坡>平路>下坡>其他>弯道>红绿灯;受车况和发动机安置方式的影响,相同路段不同车型噪声水平大小顺序为前置发动机普通车>前置发动机中级车>后置发动机中级车>后置发动机高级车;受测试区域的影响,相同路段后置发动机车乘客区噪声水平明显大于驾驶区,前置发动机车乘客区噪声水平略小于驾驶区。在48个评价值中,驾驶区和乘客区出现噪声超标的数量分别为5个、3个。更多还原

【Abstract】 An off-load noise comparative experiment was designed to study the interior noise of bus under urban driving conditions,using four kinds of representative medium-sized buses in Chongqing. Influenced by engine speed and travel speed,the order of noise level in one certain bus at different road sections was as follows: uphill > level road > downhill > other conditions > bend > traffic lights. Influenced by bus condition and engine installation position,the noise level of different buses at the same road section followed the order: conventional bus with front engine > middle class bus with front engine > middle class bus with rear engine > high class bus with rear engine. At the same road section,the noise in passenger compartment was apparently higher than that in the driver compartment with rear engine.However,it was slightly lower in buses with front engine. Among the 48 evaluation values,the number of values that failed to reach qualified noise standard in driver compartment and passenger compartment were 5 and 3.更多还原