Transfer of the Method for the psychoacoustic Design of Ground Bevel Gears extended by the Application of a Targeted Micro Geometry Scatter

对齿轮和变速器的要求取决于外部条件，如立法以及世界市场上的竞争形势。为了提高效率而对更高功率密度的持续需求可以通过减少所涉及的质量和通过新材料增加的承载能力来实现。此外，变速器的主要要求是低噪声水平。特别是锥齿轮，由于高值的修改，具有相对较低的接触比，通常被描述为噪声临界。与研磨锥齿轮组相比，研磨锥齿轮组被认为更安静或更平滑。目前的调查表明，制造相关的微观几何形状分散和间距偏差可以被确定为根本原因。相比之下，磨削锥齿轮具有高的制造几何形状的再现性，具有低的节距偏差。几何形状的高再现性可能导致音调噪声频谱。目标桨距偏差的实施用于风扇应用，以降低转子叶片频率的高次谐波的振幅。在齿轮应用中，避免了用于降低音调的节距偏差，因为它可能导致过早的齿啮合，从而导致承载能力的降低。本研究项目的目的是转移的心理声学设计的锥齿轮在汽车应用的方法。因此，现有的方法的动态模拟的齿啮合和心理声学设计的齿轮提供了基础的项目，并将扩展到一个完整的齿狩猎的模拟，以实现增加的背景噪声水平有针对性的地形散射。地形散射用于降低噪声频谱的音调。使用基于有限元的轮齿接触分析，实现了每个齿具有单独的微观几何形状的齿轮组的模拟。为了确保工艺的生产率，形貌散射的制造工艺需要在没有额外修整操作的情况下实现。此外，它是必要的，以避免不利的承载能力，定义的微观几何分散。所传递的方法和获得的知识将应用于汽车变速器，并将通过试验台试验和车辆测量进行验证。计划中的研究项目的结果是一种基于目标地形散射优化锥齿轮声学行为的新方法。

The requirement on gears and transmissions are determined by external conditions as the legislation as well as the competitive situation on the world market. The continuous demand for higher power densities for the increase of the efficiency can be achieved by a reduction of the involved masses and by an increased load-carrying capacity via new materials. Furthermore, a major requirement by the transmission is a low noise level. Especially bevel gears, with comparatively low contact ratios because of the high values for the modifications, are often described as noise critical.Lapped bevel gear set are perceived as being quieter or smoother compared to ground bevel gear sets. Current investigations lead to the fact that the manufacturing related microgeometry scatter and pitch deviation can be identified as the root cause. Ground bevel gears in contrast have a high reproducibility of the manufactured geometry with low pitch deviations. The high reproducibility of the geometry may lead to a tonal noise spectrum. The implementation of targeted pitch deviations is used for fan applications to reduce the amplitudes of higher harmonics of the rotor blade frequency. In gear applications, the pitch deviation for reduction of tonality is avoided, as it may lead to premature tooth meshing which lead to a decrease of the load-carrying capacity. The aim of this research project is the transfer of the method for psychoacoustic design of bevel gears on an automotive application. Therefore, the existing methods of the dynamic simulation of the tooth mesh and the psychoacoustic design of gears provide the basis for the project and will be extended for the simulation of a complete tooth hunt in order to implement an increase of the background noise level by a targeted topography scatter. The topography scatter is used to reduce the tonality of the noise spectrum. Using the FE-based tooth contact analysis, a simulation of a gear set with individual micro geometries for each tooth is realized. In order to assure the productivity of the process The manufacturing process of the topography scatter needs to be realized without an extra dressing operation. Furthermore, it is necessary to define the microgeometry scatter which avoids disadvantages for the load-carrying capacity. The transferred methods and the gained knowledge will be applied on an automotive transmission and will be validated by test rig trials and vehicle measurements. The result of the planned research project is a novel method for optimizations of the acoustic behavior of bevel gears based on a targeted topography scatter.