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1连杆小头衬套型线对其摩擦副润滑和变形特性的影响显示文摘基于弹流润滑(elastic hydrodynamic lubrication,EHL)和粗糙峰接触理论及平均流量模型,建立了某连杆小头摆动摩擦副柔性多体动力学模型,分析研究了抛物型线、双曲型线和锥度型线3种衬套型线对连杆小头摆动摩擦副润滑及变形匹配的影响。结果表明:抛物型线与双曲型线的润滑和变形特性都要优于无型线;而锥度型线润滑性能变差,变形特性能得到提升;综合来看,切削量为6μm的双曲型线对连杆小头衬套润滑和变形匹配的综合改善效果较好。秦作鲲 向建华 钟乘龙 李超超 2020内燃机工程2020,41,1:6
2Statistics of breaking waves and its applications to estimation of air-sea fluxes (Ⅰ)——Theoretical models显示文摘Wave breaking statistics, such as the whitecap coverage and average volume of broken seawater, are evaluated in terms of wave parameters by use of wave breaking model (Yuan et al., 1988) taking the fifth order Stokes's wave as the analog of the original wave field. Based on the observed fact that breaking waves play an important role in the exchange of mass, momentum and energy between the atmosphere and the ocean, the influence of wave breaking on air-sea fluxes of heat and moisture is investigated. Theoretical expressions of bubble-volume flux and sea spray spectrum at the sea surface and models for bubble-induced and spray droplet-induced heat and moisture fluxes are established. This work can be taken as the basis for further understanding the mechanism of air-sea coupling and parameterization models.ZHANG Shuwen YUAN Yeli 2004Science China Earth Sciences2004,47,1:1
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