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探知噪音成因 借助设计巧思 让日立挖掘机驾驶室摆脱噪声困扰

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机械正常作业时,日立挖掘机驾驶室内司机耳旁的噪声来源除了无法避免的工作环境噪声外


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发动机罩结构一般有两种,一种为薄板材料,另一种为玻璃钢薄板材料一般采用1.5~3mm的钢板,具体根据机罩的大小和形状来选择。机器工作时的颠簸和发动机振动产生的激振都将引起机罩的振动,增加外部噪声源。因此发动机罩首先须具有特定的刚度和强度,并尽量避免与日立挖掘机驾驶室直接相连,驾驶室与机罩之间留有足够间隙或用减振垫进行缓冲。为提高机罩整体的强度,通常采用在结构上加加强筋、起筋等方法来实现。此外还可将机罩设计为填充有隔声材料的双层结构,或者在两侧罩和顶罩内表面上粘贴一层多孔材料,有效地吸收发动机的噪声,这些措施都可起到特定的降噪隔振的作用。玻璃钢材料因其特有的制作工艺,制作出的成品较厚且其材料为玻璃丝纤维层层粘接而成,吸音降噪效果较好。【具体可参考《一个合格的日立挖掘机驾驶室需满足哪些要求?》的相关内容】

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