摘要
为进一步提高轴承刚度,将真空预加载技术与多孔质空气静压轴承相结合,使轴承在没有额外预加载导轨的情况下获得双向刚度。探讨工作条件和结构参数对真空预载型多孔质空气静压轴承性能的影响,基于计算流体力学(computational fluid dynamics,CFD)方法对其静动态特性进行了数值分析。深入研究了供气压力、真空度、渗透率、真空抽气口直径、扰动幅度和扰动频率等因素对轴承性能的影响。结果表明,相比于一般多孔质空气静压轴承,真空预载型多孔质空气静压轴承的刚度提高了22.34%;工作条件和结构参数对其静态和动态特性有显著影响。该研究结果对高刚度空气静压轴承的性能研究和优化设计具有一定的指导意义。
In order to further improve the bearing stiffness,the porous aerostatic bearings can obtain bidirectional stiffness without additional preload guideway by combining vacuum preloaded(VPL)technology with the bearings.To explore the influence of working conditions and structural parameters on VPL porous aerostatic bearing performance,a numerical analysis of static and dynamic characteristics was performed based on the computational fluid dynamics(CFD)method.The influences of the air supply pressure,the vacuum degree,the permeability,the vacuum suction port diameter,the perturbation amplitude and the perturbation frequency were thoroughly investigated.The analysis shows that the stiffness of VPL porous aerostatic bearings increases by 22.34%compared with that of ordinary porous bearings,and working conditions and structural parameters have a significant influence on static and dynamic characteristics.It is expected that the results can guide performance research and optimization design for the high-stiffness aerostatic bearings.
作者
闫如忠
张银宝
YAN Ruzhong;ZHANG Yinbao(College of Mechanical Engineering,Donghua University,Shanghai 201620,China;Engineering Research Center of Advanced Textile Machinery,Ministry of Education,Donghua University,Shanghai 201620,China)
关键词
真空预加载技术
计算流体力学(CFD)
静态特性
动态特性
vacuum preloaded technology
computational fluid dynamics(CFD)
static characteristic
dynamic characteristic
