计入转子动力学性能影响的高速滚动轴承多体润滑及热特性研究

A high speed rolling bearing is widely applied to major equipments such as aeroengine. However, there widely exist fault problems such as lubrication fault and thermal instability for this kind of bearings. Moreover, there is a lack of scientific method for analyzing the coupling between the bearing lubrication and rotor dynamic performances. To overcome the above problems so as to meet requirements for the high speed bearing with high performances in the aerospace industry of our country, the multi-body lubrication (i.e., simultaneous lubrication between the rolling element, and inner and outer raceways) and thermal characteristics of the bearing (temperature rise and thermal deformation etc.) , considering the effect of the matched rotor dynamic performances, are studied based on researches and applications of the bearing technologies owned by the State Key Laboratory of Mechanical Transmission of Chongqing University. For this, a set of equation groups considering the multi-body lubrication and thermal characteristics for the bearing based on the rotor dynamic performances are proposed. Through an artificial neural network, optimal algorithm and Fast Fourier Transformation, along with the experimental validation, effects of rotor dynamic performances, multi-body lubrication, collapse of bubbles in the lubricant and the oil film inertia forces, etc. on the lubrication performance and thermal characteristics of the bearing are investigated, and further corresponding influencing rules are revealed. Then, a method, based on the regulation of the rotor dynamic behavior and optimization of bearing parameters etc., is proposed to improve the lubrication performances of the high speed bearing and restrain its thermal fault, which is desired to provide a key scientific theoretical and methodological support to improve the lubrication performances and to avoid thermal fault for the high speed bearing used in fields such as aeroengine in our country.

高速滚动轴承广泛应用于航空发动机等重要装备，但普遍存在润滑失效、热失稳等现象，且缺乏轴承润滑―转子动力学性能耦合分析的科学方法。为攻克上述难题以满足我国航空工业等领域对高性能高速滚动轴承的迫切需求，在集成重庆大学机械传动国家重点实验室轴承研究和应用方面多年技术积累的基础上，对计入转子动力学性能影响的高速滚动轴承多体润滑（滚动体与内外滚道同时润滑）和热特性（温升和热变形等）进行多场耦合研究。为此，建立计入转子动力学性能影响的高速滚动轴承多体润滑和热力学方程组；借助人工神经网络、优化算法、FFT等方法，并结合实验的验证，揭示转子动力学性能、多体润滑、润滑剂气泡溃灭、油膜惯性力等对高速滚动轴承润滑性能和热特性的影响规律，提出通过转子动力学行为的调控、轴承参数的优化，以提升轴承润滑性能、抑制其热失效，从而为我国航空发动机等领域使用的高速滚动轴承性能分析提供关键科学理论和方法支撑。

高速滚动轴承广泛应用于航空发动机等重要装备，但普遍存在润滑失效、热失稳等现象，且缺乏轴承润滑―转子动力学性能耦合分析的科学方法。为攻克上述难题以满足我国航空工业等领域对高性能高速滚动轴承的迫切需求，迫切需要对计入转子动力学性能影响的高速滚动轴承多体润滑（滚动体与内外滚道同时润滑）和热特性（温升和热变形等）进行多场耦合研究。为此，开展了高速滚动轴承多体润滑，开展了高速滚动轴承润滑性能、热特性—转子动力学性能耦合求解方法研究，开展了计入转子动力学性能影响的高速滚动轴承润滑及热特性，以及高速滚动轴承润滑性能、热特性优化及实验研究。项目提出了考虑滚动体与内外圈同时润滑的高速滚动轴承多体润滑模型；提出了基于人工神经网络轴承润滑性能―转子动力学性能耦合快速求解方法；发现了多体润滑条件下内外圈润滑行为的差异；发现了油膜压力、油膜厚度以及温度等随着转子振动而呈现环状结构；相对于不考虑油膜惯性作用，油膜惯性使仿真得到中心油膜跟接近于实际测量结果；相比无裂纹情况，表面裂纹导致轴承最大润滑膜压力和最大von Mises应力增加，滚动体出现应力集中现象。. 依托本项目，发表论文共20篇，其中SCI论文16篇、EI论文3篇；申请了相关发明专利3项，其中已授权1项；申请软件著作权2项；参加了相关的国内外会议4次；培养硕士研究生11名。相关成果为我国航空发动机等领域使用的高速滚动轴承性能分析提供了科学理论和方法支撑，部分成果已应用于某水下武器减速器、装甲车辆及新型战机主轴轴承的分析与设计中。

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