Layout Method of Damping Material for Gearbox Based on Acoustic Contribution

In order to realize the low noise design of marine gearbox, a layout method of damping materials for gearbox based on acoustic contribution was proposed. The present method can accurately and effectively determine the additional area of damping materials and achieve greatly the noise reduction effect. Firstly, taking a marine single-stage herringbone gearbox as the object, the finite element/boundary element model for the reducer structure was established. After applying the vibration excitation of the gear system, the radiated noise of each field point was solved. Secondly, by analyzing the acoustic transfer vector (ATV) and modal acoustic contribution (MAC), the surface of the gearbox was partitioned, and the partitioned surface was analyzed by using panel acoustic contribution (PAC). Finally, the damping material was added to the plate area which contributes greatly to the radiated noise, and the effect of the noise reduction under different schemes were compared. The results show that the layout design of damping materials based on the present method can reduce the radiation noise of observation points accurately and effectively in the range of 0~4 000 Hz. 为了实现船用减速箱的低噪声设计，提出了一种基于声学贡献量的减速箱阻尼材料布局方法，该方法能够准确有效地确定阻尼材料的附加区域并达到了良好的降噪效果。首先以某船用单级人字齿轮减速箱为研究对象，建立了减速箱结构的有限元/边界元模型，在施加齿轮系统的振动激励后求解出各场点的辐射噪声。其次通过声学传递向量（ATV）分析和模态声学贡献量（MAC）分析对减速箱表面进行板面划分，并对已划分的板面进行板面声学贡献量（PAC）分析。最后将阻尼材料添加到对辐射噪声贡献最大的板面区域内，对不同方案的降噪效果进行了对比。结果表明依据该方法进行的阻尼材料布局设计可以在0~4 000 Hz范围内准确有效地降低观测点的辐射噪声。