Transient Tribo-Dynamics of Thermo-Elastic Compliant High-Performance Piston Skirts
Transient Tribo-Dynamics of Thermo-Elastic Compliant High-Performance Piston Skirts
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DOI：
10.1007/s11249-013-0243-6
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发表时间：
2013
影响因子：
3.2
通讯作者：
B. Littlefair;M. Cruz;S. Theodossiades;R. Mills;S. Howell-Smith;H. Rahnejat;R. Dwyer-Joyce
中科院分区：
文献类型：
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作者：
B. Littlefair;M. Cruz;S. Theodossiades;R. Mills;S. Howell-Smith;H. Rahnejat;R. Dwyer-Joyce
赛车运动应用的先进活塞技术是通过开发具有优先顺从性的短部分裙部的轻质活塞来推动的。通过结构硬化实现优先顺应性，从而通过热弹性变形在裙部底部边缘实现更大的夹带楔形，同时在裙部顶部实现更好的符合接触几何形状。在实践中，这些条件中的一些的组合旨在提高承载能力并减少摩擦。该方法是赛车和高性能发动机技术的基本精神的基础。 5 kN 量级的接触载荷和 0–35 m/s 范围内的接触运动会导致恶劣的瞬态摩擦条件。因此，活塞设计需要详细的瞬态分析，其中集成了活塞动力学、热弹性变形和瞬态弹流体动力学。本文提供了如此详细的分析，并使用非侵入式超声波辅助润滑油膜厚度测量法对正常运行条件下的点火发动机进行了验证，这种方法迄今尚未在文献中报道过。测量的薄膜厚度与预测之间具有良好的一致性。
Advanced piston technology for motorsport applications is driven through development of lightweight pistons with preferentially compliant short partial skirts. The preferential compliance is achieved through structural stiffening, such that a greater entrainment wedge is achieved at the skirt’s bottom edge through thermo-elastic deformation, whilst better conforming contact geometry at the top of the skirt. In practice, the combination of some of these conditions is intended to improve the load-carrying capacity and reduce friction. The approach is fundamental to the underlying ethos of race and high-performance engine technology. Contact loads of the order of 5 kN and contact kinematics in the range 0–35 m/s result in harsh transient tribological conditions. Therefore, piston design requires detailed transient analysis, which integrates piston dynamics, thermo-elastic distortion and transient elastohydrodynamics. The paper provides such a detailed analysis as well as verification of the same using non-invasive ultrasonic-assisted lubricant film thickness measurement from a fired engine under normal operating conditions, an approach not hitherto reported in literature. Good agreement is noted between measured film thickness and predictions.