2 edition of Analysis of the performance characteristics of aerostatic and hybrid journal bearings. found in the catalog.
Analysis of the performance characteristics of aerostatic and hybrid journal bearings.
Edwin George Pink
|Contributions||General Electric Company (Whetstone), Leicester Polytechnic.|
Hybrid journal bearings are considered since many years as a possible replacement for ball bearings in turbo-pumps used by the aerospace industry. Due to flow regimes dominated by inertia and due to the nature of the lubricant (cryogenic fluids), the prediction of the linearized dynamic coefficients in these bearings must be based on the. Some of the many types of hydrostatic bearings Hydrostatic Bearings • Applied loads ¾Large surface area allows for high load capacity. ¾Virtually insensitive to crashes. • Accuracy ¾Axial: limited only by the drive system. ¾Lateral: limited by the rails and isolation from the pressure source. • Preload ¾Most designs are inherently preloaded.
This study utilizes a dynamic mesh technology to investigate the dynamic performance of aerostatic thrust bearings with orifice restrictor, multiple restrictors, and porous restrictor. An experiment, which investigates the bearing static load capacity, was carried out to verify the calculation accuracy of dynamic mesh technology. Further, the impact of incentive amplitude, incentive frequency. development. Detailed design of axial grooved journal bearings is done and groove parameters are studied and optimized. Then the concept of using aerostatic bearings was developed and it received a huge response from all organizations and research centers. Keywords: Aerostatic bearings, Aerodynamic bearing, Bush, Spindle, Design Analysis. 1.
The experimental research on high-speed aerostatic bearing-rotor system with one compressor, one turbine and coaxial four discs was developed. The gas bearing-rotor system stability under different bearing supply pressure plans was studied by experiments. The paper also presents fault features of gas film whip instability, power frequency rubbing and low frequency rubbing, which provides. Research on dynamic characteristics of gas film of spherical hybrid gas bearings based on computational fluid dynamics. Chenhui Jia, a Zhiwu Cui, a Shijun Guo, b Wensuo Ma c. a School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, P.R. China.
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Hiromu Hashimoto, in Tribology Series, 1 INTRODUCTION. Hydrodynamic journal bearings have been widely used to support high speed rotating machinery such as turbines and compressors because of their superior durability and load carrying capacity.
Therefore, the bearings are important machine elements for enhancing the quality of the rotating machinery. Analysis of the performance characteristics of aerostatic and hybrid journal bearings.
View/ Open. (Mb) (Mb) Date Author. Analysis of the performance characteristics of aerostatic and hybrid journal bearings. View/ Open. (Mb) (Mb) DateCited by: 1. In this paper, the steady-state characteristics, including film pressure, load capacity, stiffness, misalignment moment of aerostatic bearings considering two types of misalignment (along vertical direction θ y and along horizontal direction θ x) are studied under pure-static and hybrid journal misalignment effects on the steady-state characteristics under pure-static Cited by: 1.
Aerostatic bearings are widely employed in precision machines due to their properties of low friction, low heat conduction, and long-life operation. In this work, static performance of the journal Author: Xinglong Chen, Xinglong Chen, James K Mills, Gang Bao.
The dynamic characteristics of a hybrid aerostatic bearing are experimentally investigated on a test rig consisting of a rigid rotor driven by an impulse turbine.
The rotor is horizontally mounted and is supported by two identical aerostatic bearings. Both the impulse turbine and the aerostatic hybrid bearings are fed with by: The static and dynamic characteristics of circular/two-lobe slot-entry hybrid journal bearing have been computed for textured and non-textured bearings with.
Brian Rowe DSc, FIMechE, in Hydrostatic, Aerostatic and Hybrid Bearing Design, Dynamic Model of a Thrust Pad. A simple model of a hydrostatic or aerostatic thrust bearing contained in a structure is shown in Figure Given values of bearing and structural characteristics such as λ b, C b, λ k, C k, a designer may use any one of the standard techniques to establish resonant.
Covers a wide selection of bearing shapes, offering a range and depth of information on hydrostatic, hybrid and aerostatic bearings not found elsewhere. Includes critical data on optimum performance, with design specifics from load and film stiffness data to pressure ratio considerations that are essential to make your design a success.
Therefore, to avoid this instability, a surface-restricted layer that has permeability smaller than the bulk of the porous material is usually formed on the bearing surface. In this paper, the dynamic characteristics of aerostatic porous journal bearings that have a surface-restricted layer are investigated numerically and experimentally.
Solve your bearing design problems with step-by-step procedures and hard-won performance data from a leading expert and consultant. Compiled for ease of use in practical design scenarios, Hydrostatic, Aerostatic and Hybrid Bearing Design provides the basic principles, design procedures and data you need to create the right bearing solution for your requirements.5/5(1).
In order to further study the performance of aerostatic bearing, an aerostatic bearing with a multihole integrated restrictor was proposed in this paper. Based on the physical model of aerostatic bearings, the governing equation was established, deduced discretely, and solved numerically by the finite-difference method and flow balance principle in Cartesian coordinates.
Microvibration has an important influence on the dynamic performance of aerostatic bearings. Dynamic stiffness and equivalent damping coefficient are the main indexes to evaluate the dynamic characteristics of the aerostatic bearing. In order to study the dynamic characteristics of a new type of aerostatic bearing with the elastic equalizing pressure groove (EEPG), the dynamic characteristics.
Appendix 1: Derivation of Journal Bearing Stiffness by an Approximate Analytical Method This paper investigates the dynamic characteristics of the aerostatic journal bearing, the rotation center of which is not the center of the journal length.
The Finite Difference Method (FDM) and the perturbation method are employed to calculate the stiffness and damping coefficients. Results show that the coupled stiffness and damping coefficients cannot be neglected due to the rotation. – This paper aims to investigate the effect of plugging of holes on the static performance characteristics of a constant flow valve compensated hole‐entry hybrid journal bearing system operating with Newtonian and non‐Newtonian lubricants.
The analysis considers the generalized Reynolds equation governing the flow of lubricant having variable viscosity in the clearance space and. Solving the Reynolds equation is an efficient method to simulate the performance of the hybrid air journal bearings, and the accuracy of the method is determined by discharge coefficients (Cd).
Analysis of the performance characteristics of aerostatic and hybrid journal bearings. By Edwin George Pink Download PDF (9 MB). Analysis of the performance characteristics of aerostatic and hybrid journal bearings.
By E Pink, Leicester Polytechnic (United Kingdom) and London (United Kingdom) Council for National Academic Awards (CNAA) Abstract. Air bearings (also known as aerostatic or aerodynamic bearings) are fluid bearings that use a thin film of pressurized gas to provide a low friction load-bearing interface between surfaces.
The two surfaces do not touch, thus avoiding the traditional bearing-related problems of friction, wear, particulates, and lubricant handling, and offer distinct advantages in precision positioning, such as.
Recently, aerostatic bearings are increasingly utilized in ultra-precision machine tools and semiconductor manufacturing equipments. With increasing requirements such as higher acceleration and smaller vibration, traditional static characteristics, such as load carrying capacity and static stiffness, are no longer sufficient in the design of ultra-precision aerostatic bearings.
Aerostatic porous bearings have been investigated in the last decades for precision engineering designs, since these bearings offer zero-friction and high operating speeds, as well as providing a very precise positioning system without external influence.
Numerical methods such as CFD (Computational Fluid Dynamics) play an important role in the design and behaviour analysis of porous.aerostatic bearings are investigated. Due to compressibility of the gas, the dynamic characteristics of aerostatic bear-ings show nonlinear frequency dependence.
Particularly, their nonlinear dynamic behaviors are quite remarkable for ultra-precision aerostatic bearings with small air gap heights and high supply pressure.Numerical analysis of the dynamic performance of aerostatic thrust bearings with different restrictors.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of .