气流参数对多孔质空气静压轴承静态特性及性能影响研究.pdf
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1、第36卷第5期,2023年9月 宁 波 大 学 学 报(理 工 版)中国科技核心期刊 Vol.36 No.5,Sep.2023 JOURNAL OF NINGBO UNIVERSITY(NSEE)中国高校优秀科技期刊 DOI:10.20098/ki.1001-5132.2023.0505 Influence of flow parameters on static characteristics of porous aerostatic bearing AWAIS Mehmood1,2,MUHAMMAD PUNHAL Sahto1,FAWAD Jamil1,SUMMIA Perveen3,AL
2、I NAWAZ Sanjrani4(1.Department of Mechanical Engineering,The University of Lahore,Lahore 54000,Pakistan;2.Faculty of Mechanical Engineering&Mechanics,Ningbo University,Ningbo 315211,China;3.Institute of Ocean Engineering,Ningbo University,Ningbo 315211,China;4.Department of Mechanical Engineering,Me
3、hran University of Engineering and Technology,Khairpur 76062,Pakistan)Abstract:There is a wide variety of applications of aerostatic bearings in manufacturing such as those in precision machine tools and metrology equipment.As a specific type of aerostatic bearings,porous aerostatic bearings are mor
4、e stable and stronger due to the use of porous materials.There is still not much research on the static characteristics influenced by flow-related parameters.In this paper,a mathematic model is proposed to simulate the static properties of porous aerostatic thrust bearings,including load-carrying ca
5、pacity,mass flow rate and stiffness.The pressure distribution inside the bearing is analyzed by calculation based on Navier-Stokes equations.The flow factors and their effect on bearing static properties are then investigated.The findings indicate that,an increase in film thickness of the bearing sh
6、all cause load-carrying capacity decrease and also stiffness decrease.However,by increasing the thickness of porous layer the stiffness of the bearing can be effectively increased.In addition,the increased film thickness shall result in an increased mass flow rate into the bearing.These findings can
7、 be used to help design porous aerostatic bearings that are more efficient and able to handle higher loads.Key words:porous aerostatic thrust bearing;film thickness;load-carrying capacity;static characteristics;mass flow rate CLC number:TH133.36 Document code:A Article ID:1001-5132(2023)05-0001-10 1
8、 Introduction Aerostatic bearings are widely used in precision machinery and equipment due to their low friction,high precision,and high load-carrying capacity(LCC).The use of aerostatic bearings has significantly improved the performance of machinery and equipment.In the past decade,the use of poro
9、us materials,thus porous aerostatic bearings,has attracted more and more attentions.This specific type of bearing has several benefits such as great precision and reduced friction1,and the load-carrying capacity as well as other characteristics are also significantly enhanced2.The 收稿日期:20230508.宁波大学
10、学报(理工版)网址:http:/ 2025”重大专项(2022Z015).第一作者:阿怀斯(1989),男,巴基斯坦人,拉合尔大学实验员/宁波大学在读硕士研究生,主要研究方向:空气静压轴承.E-mail:awais_ 2 宁波大学学报(理工版)2023 performance of porous aerostatic bearing is strongly influenced by various flow-related parameters,including film thickness,bearing thickness(which is the thickness of porou
11、s material,hence is also referred to as porous thickness),supply pressure(the pressure at the inlet),and so on.Therefore,understanding the influence of flow parameters on bearing characteristics is essential for the aerostatic bearing to deliver the desired performances.Until present,there have been
12、 some studies on the characteristics of the porous aerostatic bearings.Sahto et al3 compared the various types of aerostatic porous restrictors and improved the load-carrying capacity with an increasing in the supply of air pressure.A finite difference approach has been used to numerically determine
13、 the co-efficient of discharge based on computational fluid dynamics(CFD)4.The study on the pressure distribution of film and how manufacturing flaws affect porous aerostatic bearings has also been carried out5.However,when disturbance like inertial effects or machining forces are present,the compar
14、atively low stiffness of the bearings shall reduce the accuracy of the machine where such bearings are used6.On the other hand,there are also some researches that are relevant to the study of porous bearings.For example,the distortions of the porous plates,sleeve and shaft were properly considered t
15、o compute the axial stiffness of an aerostatic spindle by using the transient FEM structure analysis,transient CFD fluid analysis,and mesh technology7.The resultant quasi-static solutions,however,do not sufficiently describe the physics of the effects of gas lubrication films,despite being highly su
16、itable for incompressible lubrications8.The fluid-structure interaction(FSI)analysis of the porous aerostatic bearing is often based on the CFD approach.It takes longer to solve the governing equation of the air film based on FEM than it would be to analyze the pressure distribution of the air film
17、using CFD simulation9.Wang et al10 studied how manufacturing errors can affect the bearings load-carrying capacity.They found that static performance is greatly affected by the film thickness and the pressure distribution.And,the transient and steady state performances of porous bearings are still b
18、eing investigated extensively due to the complexity of irregular structure of porous materials.In this paper,we take the thrust bearing as the research object.The influence of supply pressure on the LCC of porous aerostatic thrust bearing is investigated first.Also studied is the influence of the be
19、aring thickness on the LCC of the porous aerostatic thrust bearing.The Fluent CFD software is used for determination of the internal pressure distribution in the clearance of the bearing.Lastly,the impacts of supply pressure,film thickness and other parameters of the porous material on the stiffness
20、 of the porous aerostatic thrust bearing are investigated.The aim of this work is to understand the static characteristics of the porous aerostatic bearings so as to improve their performance,and to help ensure that they can support the required load without excessive deformation or wear.2 Modeling
21、of porous aerostatic bearing 2.1 Structure of porous restrictor Different from ordinary aerostatic thrust bearings,a porous thrust bearing consists of an important component called porous restrictor,which is used to generate air film between the bearing body and the shaft or any other mechanical str
22、ucture that is to be supported by the bearing.Besides,the porous restrictor also has the strength of producing a more even pressure distribution of air,as compared with other mechanisms that are also capable of generating air film11.At the working mode,air flows into the bearing body through inlet,w
23、hich is then blown into the porous material of the restrictor at a specified pressure called supply pressure.Through this porous material,the outflow of air shall then produce the required air film,which shall determine the load-carrying capacity of the bearing.It is necessary to build up a model of
24、 a restrictor and an air film for studying the static characteristics of porous bearing.For simplicity of elaboration,we refer 第 5 期 AWAIS Mehmood,et al:Influence of flow parameters on static characteristics of porous aerostatic bearing 3 to the modeling of porous restrictor and air film as the mode
25、ling of porous aerostatic bearing itself.In this paper,ANSYS workbench is used to establish the finite element model of the bearing.Fig.1 shows the geometric construction of the restrictor,where half of the geometry is shown as this is to be used to generate the corresponding mesh model.The geometri
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- 气流 参数 多孔 空气 静压 轴承 静态 特性 性能 影响 研究
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