Operating condition-dependent model for describing the electrical impedance of rolling bearings for sensory utilization

研究表明，忽略了与运行条件有关的滚动轴承电容的影响因素。负载区域外的滚动接触对滚动轴承的阻抗具有影响，并且有助于改善负载与阻抗之间的模型相关性。为了描述空载滚动元件的阻抗，使用了具有与球和内圈或外圈之间的点接触相对应的操作条件相关的几何形状的大致弯曲的电容器的模型。这些目标激发了以下工作假设：WH I。空载滚动体的分离润滑膜影响滚动轴承的电容，空载滚动体上的润滑膜厚度、轴承间隙、滚动体密度都要计入电容。 边界因子可以用依赖于运行参数的物理激励模型来代替，以描述点接触滚动轴承的测量阻抗，而无需经验因子。在所申请的项目中，通过考虑阻抗模型中的无负载滚动元件在任意负载角下的滚动轴承，contact.这导致了以下项目目标：1。描述负载区域外的滚动元件的负载相关位置和运动学，用于计算空载滚动接触的能力。2.所有滚动接触的完整阻抗贡献的映射。在相关的工作范围内，对不同的点接触滚动轴承进行试验，验证扩展。为了了解滚动轴承的电气性能，还需要对混合摩擦进行研究。为了避免不必要的电流通过和损坏滚动轴承或润滑剂，必须限制小测量电压。然而，重点是滚动轴承的流体动力学运行，尺寸的影响是在第二个尺寸上随机研究的。由于污染或老化导致的润滑剂变化以及滚动轴承的损坏被排除在外。润滑油经过过滤并定期更换。在短期试验中检查滚动轴承，并且还进行一些初步试验以确定累积损伤的计算上限，滚动轴承可以在不改变的情况下进行检查。在该项目中，考虑了点接触的单列滚动轴承，主要是在EHD条件下静止，但也有混合摩擦。由于滚动接触过滚过程中的时间非常短，因此调查结果也可以转移到具有变速负载的滚动轴承上。

The state of research shows that relevant influencing factors of the electrical capacitance of a rolling bearing, which depends on the operating condition, are neglected. The rolling contacts outside the load zone have an influence on the impedance of the rolling bearing and contribute to an improvement of the model correlation between load and impedance. To describe the impedance of unloaded rolling elements, the model of a generally curved capacitor with operating condition-dependent geometry corresponding to the point contact between ball and inner or outer ring is used. The objectives motivate the following working hypotheses:WH I. The separating lubricating films of unloaded rolling elements affect the electrical capacitance of rolling bearings; lubricating film thickness on unloaded rolling elements, bearing clearance, and the density of rolling elements must enter into the capacitance.WH II. The boundary factors can be replaced by an operating parameter-dependent physically motivated model to describe the measured impedances of rolling bearings with point contact without empirical factors.In the project applied for, the difference between measurement and calculation is to be reduced to a level sufficient for a sensory concept by considering the unloaded rolling elements in the impedance model at arbitrary load angles for rolling bearings with point contact. This results in the following project objectives:1. description of the load-dependent position and kinematics of the rolling elements outside the load zone for calculation of the capacity of the unloaded rolling contact.2. mapping of the complete impedance contribution of all rolling contacts.3. validation of the extensions in tests on different rolling bearings with point contact in the relevant operating range.Investigations also in mixed friction are necessary to understand the electrical behavior of rolling bearings. The limitation to small measuring voltages is necessary to avoid unwanted current passage and damage to rolling bearings or lubricant. However, the focus is on the hydrodynamic operation of rolling bearings, and the influence of size is investigated randomly on a second size.Changes in the lubricant due to contamination or aging are excluded, as is damage to the rolling bearing. The lubricant is filtered and replaced regularly. The rolling bearings are examined in short-term tests, and a few preliminary tests are also carried out to determine a calculated upper limit for the accumulated damage up to which the rolling bearings can be examined without alteration. In the project, single-row rolling bearings with point contact are considered, primarily stationary at EHD conditions but also in mixed friction. Due to the very short-time events during the overrolling of a rolling contact, the findings from the investigation can also be transferred to rolling bearings with variable-speed loading.