大型圆柱壳体切削噪声控制的实验研究

在造纸机械烘缸加工的实验缩尺模型的基础上，分析了壳体切削噪声的一般特征以及切削用量对切削噪声的影响，证明了主要声源为切削过程中工件的声辐射。通过几种降噪方案的分析、比较、确定了以隔声措施为主，提高刀杆动态特性措施为补充的降噪方案。设计制作了仅罩住工件的实验性隔声罩，并分析了其隔声性能，指出了其不足与改进措施，在此基础上，设计制作了全封闭型的实验性隔声罩，取得了２５ｄＢ（Ａ）的降噪效果，对刀杆约束阻

Experiment Research on Cutting Noise of Large Cylindric Shell

In this paper based on experimental reduced sca1e model of dryer of paper-mechinery, the general characteristics of the cutting noise of cylindric shell and the influence of cutting guantity on the cutting noice are analysed, and it proves that the main source of noise is the sound radiation of cylindric in the cutting process, Through analying and contrasting several noise reduction progams, we decide to adopt the sound insulation as main measure and the improvement of tool shank dynamic behavior as supplimentary means. The experimental acourstic hood that only enclosed medel of the dryer has been desingned and manufactured, and its insulation per formance analysed to find out shortcomings and put forward improvement steps. On the basis of these, all-closed experimental acoustic hood has been developed and gained 25dB(A) effect of noise reduction. Furthermore, 2. 5dB(A) noise reduction has been obtained by applying damping meterial the tool shank. A practical acoustic hood, which has the characteristics of all-closed structure, fast opening and closing, noninf1uence on machine toll oparation, safety and re1iability, has been designed and earned agreememt use in Xi'an Papermaking Machinery Works.