Development of Test Rig for High-Speed Railway Rolling Bearings

The rolling bearing test rig for heavy vehicles often works under heavy load and high speed, thus it requires high performance for the main shaft and mechanical structure. In this paper a design of test rig for high-speed railway rolling bearings is presented, in which a new structure is adopted to reduce the load on the support bearings. The basic idea is to position the load in a way that they can be balanced by each other.

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Research on Blade-Casing Rub-Impact Mechanism by Experiment and Simulation in Aeroengines

Shock and Vibration ◽

10.1155/2019/3237960 ◽

2019 ◽

Vol 2019 ◽

pp. 1-15 ◽

Cited By ~ 2

Author(s):

Jie Hong ◽

Tianrang Li ◽

Zhichao Liang ◽

Dayi Zhang ◽

Yanhong Ma

Keyword(s):

High Speed ◽

High Performance ◽

Element Model ◽

Physical Parameters ◽

Test Rig ◽

Calculation Results ◽

Rotor Support ◽

Blade Tip ◽

Set Up ◽

The Impact

Aeroengines pursue high performance, and compressing blade-casing clearance has become one of the main ways to improve turbomachinery efficiency. Rub-impact faults occur frequently with clearance decreasing. A high-speed rotor-support-casing test rig was set up, and the mechanism tests of light and heavy rub-impact were carried out. A finite element model of the test rig was established, and the calculation results were in good agreement with the experimental results under both kinds of rub-impact conditions. Based on the actual blade-casing structure model, the effects of the major physical parameters including imbalance and material characteristics were investigated. During the rub-impact, the highest stress occurs at the blade tip first and then it is transmitted to the blade root. Deformation on the impact blade tip generates easily with decreased yield strength, and stress concentration at the blade tip occurs obviously with weaker stiffness. The agreement of the computation results with the experimental data indicates the method could be used to estimate rub-impact characteristics and is effective in design and analyses process.

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Experimental Investigation of Squeeze Film Damper Characteristics at High Speed Rotor Configurations

ASME 2014 Gas Turbine India Conference ◽

10.1115/gtindia2014-8186 ◽

2014 ◽

Cited By ~ 1

Author(s):

Jayaraman Kandasamy ◽

B. L. Jaiswal ◽

P. Sarasu ◽

S. Sivaperumal ◽

Dilli Babu ◽

...

Keyword(s):

High Speed ◽

High Performance ◽

Critical Speed ◽

Advanced Materials ◽

Squeeze Film ◽

Test Rig ◽

Variable Frequency Drive ◽

Squeeze Film Damper ◽

Essential Components ◽

Turbo Machinery

High performance turbo machinery demands high shaft speeds, increased rotor flexibility, tighter clearances in flow passages, advanced materials, and increased tolerance to imbalances. Operation at high speeds induces severe dynamic loading with large amplitude journal motions at the bearing supports. Squeeze film dampers are essential components of high-speed turbo machinery since they offer the unique advantages of dissipation of vibration energy and isolation of structural components, as well as the capability to improve the dynamic stability characteristics of inherently unstable rotor-bearing systems. A bearing test rig is developed using 350 KW motor with variable frequency drive and has the potential of maximum operating speed up to 20,000 rpm. A squeeze film damper is used between the bearings and housing to reduce the unbalance forces transmitted to the pedestal by introducing an additional damping and thereby reduces the amplitude of vibration to acceptable level. The test rig instrumentation is capable of detecting bearing critical speed of the test rotor, and has been used for parametric studies and to monitor the temperature profile, vibration levels and pressure distribution of SFD oil film. The first critical speed of the test rotor is measured. The vibration level of the rotor system is increased with the rise of axial load together with speed. It is estimated that under all the conditions presence of oil in SFD zone reduces the vibration levels.

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Wheel/Rail Contact Geometry of Different Wheel Tread Profile in High-Speed Railway Turnout

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.3988 ◽

2011 ◽

Vol 255-260 ◽

pp. 3988-3992 ◽

Cited By ~ 2

Author(s):

Rong Chen ◽

Wang Ping ◽

Yang Song

Keyword(s):

High Speed ◽

Dynamic Interaction ◽

Longitudinal Distribution ◽

Key Factors ◽

Heavy Load ◽

High Speed Railway ◽

Equivalent Conicity ◽

Railway Turnout ◽

Safety And Stability ◽

Vertical Impact

Train/turnout dynamic interaction is exacerbated by high speed of passenger train and heavy load of freight train, and wheel/rail relation is one of the key factors that determine the running characteristics of the train. Focusing on three types of wheel treads with different profiles (TB tapered tread, LM worn tread, LMA worn tread), longitudinal distribution of the contact geometric parameters along the switch rail and nose rail of 350km/h No.18 turnout are calculated, such as tread equivalent conicity, coefficient of contact angle difference, roll angle factor, gravitational stiffness of wheelset, gravitational angle stiffness of wheelset, etc. Results show that: (1) LMA worn tread produces the smallest irregularity; (2) wheel/rail vertical impact at the frog will become bigger; (3) Top profile of switch rail and nose rail should be designed according to the wheel tread type so as to mitigate the wheel/rail dynamic interaction and increase the safety and stability of a train.

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Analysis on Prevent Common Quality Problems of Raw Material and High Performance Concrete Countermeasure of High-speed Railway

DEStech Transactions on Materials Science and Engineering ◽

10.12783/dtmse/icmsa2018/20596 ◽

2018 ◽

Author(s):

Jun GAO ◽

Xiao LIN

Keyword(s):

High Speed ◽

High Performance ◽

High Performance Concrete ◽

Raw Material ◽

High Speed Railway

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The Stress Analysis about Rolling-Sliding Blend Bearing under Heavy Load

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.308-310.1792 ◽

2011 ◽

Vol 308-310 ◽

pp. 1792-1795

Author(s):

Li Ming Lu

Keyword(s):

Finite Element ◽

Service Life ◽

Carrying Capacity ◽

Element Model ◽

Rolling Bearing ◽

Outer Ring ◽

Rolling Bearings ◽

Element Analysis ◽

Heavy Load ◽

The Finite Element Model

In the paper a new kind of rolling-sliding blend bearing has been studied. In order to comparing the new bearings and rolling bearings in the carrying capacity and service life, the stresses on the inner ring, the outer ring and the roller of rolling bearing and rolling-sliding blend bearing are analyzed by establishing the finite element model and solving it with finite element analysis software. The results show that the width of the stress concentration area on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent narrower than that of rolling bearing and the depth of the largest stress on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent shallower than that of rolling bearing and the largest stress on the middle and the end of the outer ring and the roller and the inner ring of rolling-sliding blend bearing is much smaller than that of rolling bearing. In the same case rolling-sliding blend bearings have greater carrying capacity and longer service life than rolling bearings.

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Machine Tools Mechatronic Analysis

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1243/095440505x32733 ◽

2006 ◽

Vol 220 (3) ◽

pp. 345-353 ◽

Cited By ~ 16

Author(s):

R Maj ◽

F Modica ◽

G Bianchi

Keyword(s):

Machine Tools ◽

High Speed ◽

High Performance ◽

Dynamic Behaviour ◽

Traditional Approach ◽

Optimization Technique ◽

Numerical Control ◽

Milling Machine ◽

Mechanical Structure ◽

High Speed Machine

High-speed machine tools show close interaction between the dynamic behaviour of the mechanical structure, drives, and numerical control. In order to support the designer of high-performance machines, a new analysis based on an integrated holistic mechatronic optimization technique is proposed and compared with the traditional approach. The proposed approach is applied to a three-axis milling machine for dies and mould production.

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Durability Research for High-Performance Concrete Box Girder of High Speed Railway

2010 Joint Rail Conference, Volume 1 ◽

10.1115/jrc2010-36035 ◽

2010 ◽

Author(s):

Jun-Qing Lei ◽

Xin-Hua Zhong ◽

Wu-Qin Wang

Keyword(s):

Production Technology ◽

High Speed ◽

High Performance ◽

High Performance Concrete ◽

Mineral Admixture ◽

Box Girder ◽

High Speed Railway ◽

Creep Properties ◽

Shrinkage And Creep ◽

Concrete Box Girder

Now the highspeed railway development is rapid in China. In view of the quality and the features of production technology of railway pre-concrete prefabricated box girder, the experiment researches five kinds of Pumping Concrete, which are composed of different significant slurry. Through researching the Mechanical, conductive, shrinkage and creep properties of specimen, it comes to a conclusion that the main compounding principle of low shrinkage, creep and high-performance concrete of railway box girder is adopting low water and right amount of mineral admixture.

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A Study on Bearing Creep Mechanism With FEM Simulation

Volume 12: New Developments in Simulation Methods and Software for Engineering Applications ◽

10.1115/imece2007-41366 ◽

2007 ◽

Cited By ~ 2

Author(s):

Jianjun Zhan ◽

Hiromichi Takemura ◽

Kinji Yukawa

Keyword(s):

High Speed ◽

High Performance ◽

Fem Simulation ◽

Outer Ring ◽

Compact Structure ◽

Heavy Load ◽

Abrasive Particles ◽

Rolling Elements ◽

Test Verification ◽

Rotating Load

Because of the continuous quests for high performance and compact structure of automobile and machine in recent years, rolling bearings are required to work under harder conditions of high speed and heavy load than before. The applications of hard condition may lead to a greater likelihood of happening of bearing malfunctions such as flaking, wear, creep, fracture etc. In this paper, the phenomenon called outer ring creep occurring in bearings subject to non-rotating load is discussed. Outer ring creep is referred to that bearing outer ring rotates relatively to the housing in certain applications. Outer ring creep may result in such problems as unusual noise and vibration and may cause wear of housing and outer ring. If abrasive particles caused by wear of the ring and housing enter the raceway, the bearing may be damaged and destroyed. Conventionally, the problem of outer ring creep was considered to be a result of rotating bearing load. However, even if the direction of radial load remained relatively unchanged, outer ring creep is observed in many cases. The generation mechanism of this kind of outer ring creep has not yet been made clear till now. With FEM simulation and test verification, we analyzed the phenomenon of outer ring creep under non-rotating load. We concluded that outer ring creep under non-rotating load is a result of localized strain and rippling deformation caused by rolling elements. In this paper, only outer ring creep is discussed below, but the similar result can be obtained for inner ring creep.

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A high-speed rolling bearing test rig supported by sliding bearing

Industrial Lubrication and Tribology ◽

10.1108/ilt-03-2020-0085 ◽

2020 ◽

Vol 72 (7) ◽

pp. 955-959

Author(s):

Hui Li ◽

Heng Liu ◽

Shemiao Qi ◽

Yi Liu

Keyword(s):

Service Life ◽

Peer Review ◽

High Speed ◽

Load Capacity ◽

Rolling Bearing ◽

Test Rig ◽

Sliding Bearing ◽

Content Type ◽

Rotating Speed ◽

Operating Stability

Purpose The purpose of this paper is to introduce a high-speed rolling bearing test rig supported by sliding bearing and its first experimental results. Design/methodology/approach Through analyzing the disadvantages of using rolling bearing as supporting bearing, the bottlenecks that need to be resolved urgently in the development of rolling bearing experimental technology, and the advantages of the sliding bearing, this study used the sliding bearing as the supporting bearing for the high-speed rolling bearing test rig for the purpose of prolonging the service life, increasing the load capacity and promoting the operating stability. Findings The experimental results show that the high-speed rolling bearing test rig supported by sliding bearing could stably rotate at 70,800 rpm without installing the test bearing; the temperature of the sliding bearing is increasing with the rotating speed and the maximum is less than 95°C. Moreover, the new test rig, installing an angular contact ball bearing as test bearing, could also stably rotate at 54,000 rpm with 2 kN axial load and 1 kN radial load; the temperature of the sliding bearing is increasing with the rotating speed and the maximum temperature is less than 97°C. Practical implications Rolling test rig has been established. Originality/value This paper proposes a high-speed rolling bearing test rig supported by sliding bearing, which greatly prolongs the service life, increases the load capacity and promotes the operating stability, moreover, reduces the risk of supporting bearing failure before the test bearing. This paper can also provide a new idea and reference for the design of similar bearing test rig. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2020-0085/

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