Aiming to solve the problem of noise generated by running gearbox, a computing method was proposed for predicting the noise of a gearbox from steady dynamic response to the acoustic radiation calculation. Vibrations, generated during gear meshing process, were transmitted to the bearing through the shafting. Then vibrations were transmitted to the housing, caused the vibration of housing. The vibration noise of housing was the main source of gearbox noise. Firstly, a dynamics model of the gear-rotor-bearing system was established. A dynamic bearing force was calculated by using this model, which was taken as the excitation force for the gearbox. Then, a housing finite element model was constructed, and the housing surface velocities excited by the dynamic bearing forces were obtained. Finally, an acoustic model was established using the acoustic boundary element method to predict the noise distribution of the gearbox, and the effects of meshing excitation on vibration and noise of the gearbox were found. An experimental bench was built to measure the vibration and noise of the gearbox, which verified the accuracy of the simulation results. This study was based on the overall methodology that could provide ideas for the gearbox optimized design.

为了解决齿轮箱运行中产生的噪声问题，提出了一种从稳态动态响应到声辐射计算来预测齿轮箱噪声的计算方法。齿轮啮合过程中产生的振动通过轴系传递到轴承。然后，振动被传递到壳体，引起壳体的振动。壳体的振动噪声是变速箱噪声的主要来源。首先，建立了齿轮-转子-轴承系统的动力学模型。使用该模型计算出动态轴承力，将其作为齿轮箱的激振力。然后，建立了一个壳体有限元模型，并获得了由动态轴承力激发的壳体表面速度。最后，利用声学边界元方法建立了声学模型，以预测齿轮箱的噪声分布，并发现啮合激励对齿轮箱振动和噪声的影响。建立了一个试验台来测量齿轮箱的振动和噪声，从而验证了仿真结果的准确性。这项研究基于可以为变速箱优化设计提供思路的总体方法。