仿生猪笼草结构的水润滑轴承摩擦学性能有限元分析研究

Finite Element Analysis of Tribological Properties of Bionic Water-Lubricated Bearings with Nepenthes Alata Structures

水润滑轴承的轴瓦结构设计对其摩擦磨损和润滑性能有着重要影响.为提升其摩擦学性能,设计一种轴瓦布置有仿生猪笼草结构的水润滑轴承,主要为蜡质区的月牙形结构和唇部的径向脊形结构两类.利用ANSYS Fluent对简化后的轴承润滑水膜模型进行流场分析,改变不同转速、载荷和不同织构形状、尺寸,探究水膜承载能力和减摩性能的优化情况并进行机理分析.结果表明:通过比较不同织构形状、尺寸下的轴承水膜最大压力与摩擦系数,发现型号CC1006的月牙形织构和型号DR0102的径向脊形织构的水膜承载能力和减摩性能综合优化最佳.通过改变不同载荷,发现轴瓦布置有仿生猪笼草结构的水润滑轴承更适合应用于中速中载的条件下,此时其拥有优异的水膜承载能力与减摩性能.该研究为仿生表面结构的水润滑轴承设计及摩擦学性能提升等提供了分析方法和理论依据.

The structure design of water-lubricated bearings has a significant influence on their friction and wear performances,as well as lubricity.A new type of bionic water-lubricated bearing has been designed in order to improve its tribological properties.There were Nepenthes Alata structures on its bearing bush,which were mainly two types:crescent textures on the surface of slippery zones and ridged textures on that of the peristome.The flow field analysis was carried out by ANSYS Fluent used the simplified lubricating film model of the bearing.By the variation of rotational speeds,loads and surface textures of different shapes and sizes,the optimization of the anti-friction performance and the load-bearing capacity of water film were explored and the mechanism was analyzed.It was found that the crescent texture of CC1006 and the ridged texture of DR0102 had the best comprehensive optimization of antifriction performance and load-bearing capacity of water film respectively by comparing the maximum pressure and loadbearing capacity of water film and the friction coefficient under different texture shapes and sizes.We can also draw a conclusion that bionic water-lubricated bearings with Nepenthes Alata structures had more excellent load-earing capacity of water film and anti-friction performance at the medium rotational speed and under the medium applied load.Furthermore,this study provided an analytical method and theoretical basis for designing water-lubricated bearings with bionic structures and improving their tribological properties.