On the Transient Three-Dimensional Tribodynamics of Internal Combustion Engine Top Compression Ring
On the Transient Three-Dimensional Tribodynamics of Internal Combustion Engine Top Compression Ring
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DOI：
10.1115/1.4035282
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发表时间：
2017-06-01
影响因子：
1.5
通讯作者：
Fitzsimons, B.
中科院分区：
文献类型：
--
作者：
Baker, C.;Theodossiades, S.;Fitzsimons, B.
汽车工业面临着越来越大的压力，既要减少有害排放，又要实现提高燃油效率的关键目标，同时改善或保持发动机输出功率。内燃机的损失可分为热损失和寄生损失，以及由于压缩环不利运动而造成的气体泄漏损失。假设摩擦损失在总体损失中所占比例较大，则在发动机低速时尤其值得关注。活塞-气缸系统占所有摩擦损失的近一半。环组密封功能的丧失也可能大大增加功率损失，并加剧有害排放。压缩环的动力学与其摩擦学性能有着密不可分的联系，这一联系在许多已报道的分析中还没有得到证实。对于顶部压缩环三维弹性动力学行为、其密封功能以及对整体摩擦损失的贡献之间的相互作用，人们早就应该有一个基本的了解。本文对气缸套压缩环与其固定活塞槽的连接处进行了全面的瞬时弹性摩擦动力学分析，这是一种迄今未见文献报道的方法。提出的方法旨在帮助活塞环设计评估过程。发动机的实际运行条件构成了国际行驶循环试验条件。
There are increasing pressures upon the automotive industry to reduce harmful emissions as well as meeting the key objective of enhanced fuel efficiency, while improving or retaining the engine output power. The losses in an internal combustion (IC) engine can be divided into thermal and parasitic as well as due to gas leakage because of untoward compression ring motions. Frictional losses are particularly of concern at low engine speeds, assuming a greater share of the overall losses. Piston-cylinder system accounts for nearly half of all the frictional losses. Loss of sealing functionality of the ring pack can also contribute significantly to power losses as well as exacerbating harmful emissions. The dynamics of compression ring is inexorably linked to its tribological performance, a link which has not been made in many reported analyses. A fundamental understanding of the interplay between the top compression ring three-dimensional elastodynamic behavior, its sealing function and contribution to the overall frictional losses is long overdue. This paper provides a comprehensive integrated transient elastotribodynamic analysis of the compression ring to cylinder liner and its retaining piston groove lands' conjunctions, an approach not hitherto reported in the literature. The methodology presented aims to aid the piston ring design evaluation processes. Realistic engine running conditions are used which constitute international drive cycle testing conditions.