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首页> 外文期刊>Proceedings of the institution of mechanical engineers >A new quasi-static multi-degree of freedom tapered roller bearing model to accurately consider non-Hertzian contact pressures in time-domain simulations
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A new quasi-static multi-degree of freedom tapered roller bearing model to accurately consider non-Hertzian contact pressures in time-domain simulations

机译：新的准静态多自由度圆锥滚子轴承模型，可在时域仿真中准确考虑非赫兹接触压力

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The accuracy of the fatigue life calculations in rolling bearing simulations is highly dependent on the precision of the roller-raceway contact simulations and the ability to accurately include structural deflections of the supporting structure. Several different methods exist to simulate the pressure distributions, and in time-domain bearing simulations, where many contacts need evaluation, the simple and time efficient methods are more popular. These methods underestimate the fatigue life reduction due to roller end effects, overload and misalignments. Furthermore, existing time-domain rolling bearing models assume that the bearing rings remain circular, which can be a poor approximation, especially for large and flexible supported bearings. This paper presents a new multi-degree of freedom frictionless quasi-static time-domain tapered roller bearing model that uses high precision elastic half-space theory to simulate the contact pressures and allows for an arbitrary stiffness of the outer ring supporting structure. The potentially higher computational demand using the advanced contact calculations is addressed by pre-processing series of contacts at different centreline approaches and roller tilt angles, which are used for interpolating contact results during time-domain simulations. The stiffness of the outer ring supporting structure is included by condensing a FE-model using an assumed modes method also known as modal flexibility. It is demonstrated that this new model allows for simulation of bearing misalignments and structural deflections, and that the effect of these conditions is directly evaluated in a detailed fatigue life analysis.
机译：滚动轴承模拟中疲劳寿命计算的精度高度取决于滚子-滚道接触模拟的精度以及准确地包括支撑结构的结构变形的能力。存在几种不同的方法来模拟压力分布，并且在时域轴承模拟中，其中许多接触需要评估，简单而省时的方法更受欢迎。这些方法低估了由于辊端效应，过载和不对中而导致的疲劳寿命降低。此外，现有的时域滚动轴承模型假定轴承套圈保持圆形，这可能很难近似，特别是对于大型且柔性的支撑轴承。本文提出了一种新的多自由度无摩擦准静态时域圆锥滚子轴承模型，该模型使用高精度弹性半空间理论模拟接触压力，并允许外圈支撑结构具有任意刚度。通过对在不同中心线进给和滚轮倾斜角的一系列接触进行预处理，可以解决使用高级接触计算可能产生的更高计算需求，这些接触用于在时域模拟过程中内插接触结果。通过使用假定模态方法（也称为模态柔性）压缩FE模型来包括外圈支撑结构的刚度。结果表明，这种新模型可以模拟轴承的不对中和结构变形，并且可以在详细的疲劳寿命分析中直接评估这些条件的影响。

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