基于上车架模态分析的挖掘机驾驶室声振舒适性改进  

NVH Improvement of Excavator Cab Based on Modal Analysis of the Upper Frame

作　　者：米永振 周以齐[1] 刘磊[1] 

机构地区：[1]山东大学高效洁净机械制造教育部重点实验室,济南250061

出　　处：《噪声与振动控制》2014年第6期51-55,共5页Noise and Vibration Control

基　　金：济南市高校院所自主创新计划(31360005081330)

摘　　要：针对某型号履带式液压挖掘机驾驶室怠速时声振舒适性较差的问题,对其进行测试并分析发动机、驾驶室两级悬置的隔振性能及上车架的振动,确定怠速时上车架受发动机激励产生共振。对上车架结构进行改进,并通过有限元模态分析预测了改进效果。试制样件后再次测试,发现驾驶室内噪声明显下降,上车架的低频共振基本消除。以怠速时驾驶员右耳耳旁噪声的响度、粗糙度和抖动度为指标,对驾驶室的声振舒适性进行了客观评价。结果表明,上车架改进后的各参数较改进前均有所下降,驾驶室的声振舒适性得到改善。The vibration isolation performance of the suspension system of an excavator which supports the engine andthe cab, and the vibration of the upper frame, are analyzed based on the test results. It is found that a low- frequencyresonance excited by the engine occurs in the upper frame. The structure of the upper frame is modified, and the validity ofthe modification is predicted by modal analysis simulation and is verified by the tests. The NVH character of the cab isestimated by the parameters of loudness, roughness and fluctuation intensity corresponding to the noise at the driver’s rightear. It is shown that these parameters are reduced apparently after the modification of the upper frame and the NVHcharacter of the cab is improved.

关 键 词：振动与波 挖掘机 模态分析 驾驶室 声振舒适性 

分 类 号：O241.82[理学—计算数学]