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以某型号履带式液压挖掘机的驾驶室为研究对象,建立有限元模型并通过仿真和对比测试验证其可靠性。在此基础上,对驾驶室进行壁板声学贡献度分析,确定对驾驶员耳旁噪声贡献较大的板件。对目标板件以形貌优化代替常用的阻尼处理方法,通过加强刚度抑制其振动,进而仿真预测驾驶室内噪声的降低情况。对比形貌优化和阻尼处理后相应的驾驶员耳旁噪声声压级信号,发现形貌优化能够取得与阻尼处理相当的效果,并对两种方法各自的降噪机理和特点进行初步探讨。
Taking the cab of a certain type of crawler hydraulic excavator as the research object, the finite element model is established and its reliability is verified through simulation and comparison test. On this basis, the acoustic contribution analysis of the cab to the siding, to determine the noise contribution to the driver’s ear larger plate. On the target plate to the topography to replace the commonly used damping treatment method, by strengthening the stiffness of its vibration suppression, and then simulation to predict the noise reduction cab environment. Contrast the topography and the corresponding acoustic pressure level signals of the driver’s ear after the topography optimization, we find that topography optimization can achieve the equivalent effect of the damping process, and the noise reduction mechanisms and characteristics of the two methods are discussed.