scholarly journals Development of Cryogenic Test Rig for Ball-Bearing and Evaluation of the Performance of the Prototype Ball-Bearing of Turbo pump

2012 ◽  
Vol 28 (4) ◽  
pp. 167-172 ◽  
Author(s):  
Jun Hyeon Jo ◽  
Yoon Chul Rhim ◽  
Sungchul Lee ◽  
Choong Hyun Kim
Keyword(s):  
Ball Bearing ◽  
Test Rig ◽  
Turbo Pump

Detection of Generalized Roughness on Ball Bearing by Cyclostationarity Technique

2009 ◽  
Author(s):  
Gianluca D’Elia ◽  
Marco Cocconcelli ◽  
Riccardo Rubini
Keyword(s):  
Frequency Spectrum ◽  
Ball Bearing ◽  
Early Stage ◽  
Vibration Signal ◽  
Experimental Results ◽  
Vibration Level ◽  
Bearing Surface ◽  
Test Rig ◽  
Characteristic Frequencies ◽  
Bearing Diagnostics

This paper deals with the detection of generalized roughness on ball bearing. In literature most of the authors focus on the detection of incipient single defects. In the early stage of the damage the vibration signal of the bearing contains characteristics components in the frequency spectrum that reveal both the presence of the fault, and on which element of the bearing the damage is placed. In time the damage develops and important parts of the bearing surface (usually the external or the internal rings) become faulted, and the bearing is said to be affected by generalized roughness. In that case the vibration level of the bearing increases and the characteristic frequencies of the damage are no longer recognizable. In this paper the authors propose the use of cyclostationarity to analyse the vibration signal in the generalized roughness condition. The cyclostationarity allows to detect phenomena which happens repeatedly in a signal. In particular the second-order cyclostationarity has been proved to be suitable for bearing diagnostics, since the periodic impact between a ball and a faulted ring happens with a variable period due to slippery between the bearing elements. So far the cyclo-stationarity has been used to detect single defects, in this paper its use is extended to distributed defects. Experimental results are reported. In particular a degreased bearing is placed on a test-rig and radially loaded to accelerate wear phenomena. The vibration signal is then analysed with two techniques compared to each other: the envelope analysis (which is a well-known method taken from the literature) and cyclostationarity.

Research on the Mechanical Properties of a New “I” Type Double-Decker Ball Bearing

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Yili Zhu ◽  
Yongchun Zhang ◽  
Chaowu Jin
Keyword(s):  
Mechanical Model ◽  
Mechanical Characteristics ◽  
Ball Bearing ◽  
Calculation Model ◽  
Load Test ◽  
Centrifugal Forces ◽  
Test Rig ◽  
Double Decker ◽  
Bearing Load ◽  
Simulation Results

The new “I” type double-decker ball bearing (NITDDBB) with two inner contact ball bearings is proposed to improve the speed and load capability of the original I type double-decker ball bearing (OITDDBB). Based on the quasi-statics principle, the mechanical model of the NITDDBB is established and takes into consideration the radial load, axial load, and ball centrifugal forces, as well as the gyroscopic moments. The corresponding calculation model is established on the matlab platform. The mechanical characteristics of the NITDDBB are analyzed and compared with the OITDDBB and also with a single-decker ball bearing (SDBB). Finally, a bearing load test rig is designed and built to verify the simulation results. The results provide a theoretical and experimental basis for the application of the NITDDBB.

Image Acquisition and Image Processing Algorithms for Movement Analysis of Bearing Cages

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Eberhard Abele ◽  
Lars Holland ◽  
Alexander Nehrbass
Keyword(s):  
Ball Bearing ◽  
Experimental Studies ◽  
Movement Analysis ◽  
Image Evaluation ◽  
Test Rig ◽  
Operation Condition ◽  
Angular Contact Ball Bearing ◽  
Image Processing Algorithms ◽  
Processing Algorithms ◽  
Motion Behavior

Movement analyses of ball bearings with regard to stable and unstable cage motion behavior are often conducted by simulations, typically by investigating the cage whirl. Some experimental studies exist in which the cage is modified in order to capture its movement with sensors. This paper presents an image-based approach for investigating the cage motion without modifications, which in turn allows a cage motion analysis of an angular contact ball bearing under operation condition. Two new image evaluation algorithms are presented in detail and their suitability is verified by experiments on a bearing test rig.

Failure Analysis of Ball-Bearing of Turbo-Pump Used in Liquid Rocket Engine

2015 ◽  
Vol 830-831 ◽  
pp. 709-712 ◽  
Author(s):  
Venkateswarlu Vartha ◽  
M.S. Arun Kumar ◽  
Saxon Mathew ◽  
Rajan Aneesh ◽  
John Bejoy ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Ball Bearing ◽  
Rocket Engine ◽  
Operating Conditions ◽  
Rolling Contact ◽  
Liquid Rocket Engine ◽  
Bearing Failure ◽  
Deep Groove ◽  
Liquid Rocket ◽  
Turbo Pump

Rolling contact bearings often referred as antifriction bearings are found in many applications where rotating components are involved. Extreme operating conditions, counterfeit or inferior quality bearings, inadequate lubrication, etc often lead to bearing failures. Each rolling contact bearing failure leaves traces of evidences on what caused its failure. Failure analysis of one such bearing is the subject of this paper.One of the engine ground tests was aborted due to the failure of a self-aligning deep groove ball bearing used in turbo-pump of a liquid rocket engine. Series of engine ground tests are conducted as a part of injector acceptance for a liquid rocket engine. The bearing failure occurred in the seventh engine test of one of such series of ground tests. The bearing mentioned here is made of SAE 52100 steel. Post-test hardware inspection revealed that the bearing and the dynamic seals on either side of the bearing are in failed condition. Inner race of bearing was found blackish in appearance with indentation and corrosion marks. Localized black spots were observed in outer race. Bearing balls were found in deformed condition. The paper highlights the failure analysis of the bearing, root cause of the bearing failure and recommendations to avoid such failures.

Modelling and Validation of a Rotor System With Ball Bearings

2010 ◽  
Author(s):  
Onur Cakmak ◽  
Kenan Y. Sanliturk
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Ball Bearing ◽  
Ball Bearings ◽  
Test Rig ◽  
Transform Method ◽  
Order Tracking ◽  
Bearing Defects ◽  
Gyroscopic Effects ◽  
Short Time

In this paper, a dynamic model of a rotor-ball bearing system is developed in Msc. ADAMS commercial software. Contacts between the balls and the rings are modelled according to Hertzian theory. The bearing model is capable of representing the effects of bearing defects and internal clearances. When they are coupled with the rotor structures, bearings without any defect can also cause excessive vibrations due to the resonance characteristics of the system. In order to demonstrate these characteristics the rotor itself is modelled as a flexible shaft and a disc positioned at the free end of the shaft. The rotor-ball bearing model developed here is capable of representing the gyroscopic effects and the behaviour of the system under different unbalance conditions. Various case studies are performed and Campbell diagrams are obtained by using short-time Fourier transform method. A test rig consisting of two ball bearings, a shaft and a disc is also designed and developed so as to validate the theoretical model using experimental data. The test rig is developed in such a way that all of the elements are easy to assemble/disassamble, allowing quick observation of the system’s dynamic behaviour for different parameters including imbalance, internal clearance and bearing defects. Modal analysis and order tracking analysis were carried out using the test rig. Both the modal results and Campbell diagrams obtained using experimental data are compared with their theoretical counterparts. In the light of the experimental data, the theoretical model is validated for the purpose of further analyses and research.

Experimental Investigation of the Dynamic Loads in a Ball Bearing Turbocharger

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Benjamin Conley ◽  
Farshid Sadeghi ◽  
Robert C. Griffith ◽  
Jeffrey W. McCormack
Keyword(s):  
Experimental Investigation ◽  
Axial Load ◽  
Ball Bearing ◽  
Dynamic Loads ◽  
Shaft Speed ◽  
Power Losses ◽  
Test Rig ◽  
Test Conditions ◽  
Custom Made ◽  
Thrust Load

The objectives of this investigation were to design and develop an experimental turbocharger test rig (TTR) to measure the shaft whirl of the rotating assembly and the axial and frictional loads experienced by the bearings. The TTR contains a ball bearing turbocharger (TC) that was instrumented and operated under various test conditions up to 55,000 rpm. In order to measure the thrust loads on the compressor and turbine sides, customized sensors were integrated into the TC housing. The anti-rotation (AR) pin that normally prevents the bearing cartridge from rotating was replaced with a custom-made load cell adapter system. This sensor was used to measure the frictional losses in the bearing cartridge without altering the operation of the TC. Proximity sensors (probes) were also installed in the compressor housing to monitor shaft whirl. Axial load results indicated that the compressor side bears most of the thrust load. As the backpressure or the speed of the TC was increased, the thrust load also increased. Frictional measurements from the AR pin sensor demonstrated low power losses in the ball bearing cartridge. For certain shaft speed ranges, the data from the sensors illustrated periodic trends in response to the subsynchronous whirl of the shaft.

Investigation of Turbocharger Dynamics Using a Combined Explicit Finite and Discrete Element Method Rotor–Cartridge Model

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Matthew D. Brouwer ◽  
Farshid Sadeghi
Keyword(s):  
Finite Element ◽  
Discrete Element Method ◽  
Ball Bearing ◽  
Discrete Element ◽  
Operating Conditions ◽  
Test Rig ◽  
Explicit Finite Element ◽  
Critical Speeds ◽  
Bearing Dynamics ◽  
Element Method

The objectives of this investigation were to develop a coupled dynamic model for turbocharger ball bearing rotor systems, correlate the simulated shaft motion with experimental results, and analyze the corresponding bearing dynamics. A high-speed turbocharger test rig was designed and developed in order to measure the dynamic response of a rotor under various operating conditions. Displacement sensors were used to record shaft motion over a range of operating speeds. To achieve the objectives of the analytical investigation, a discrete element angular contact ball bearing cartridge model was coupled with an explicit finite element shaft to simulate the dynamics of the turbocharger test rig. The bearing cartridge consists of a common outer ring, a pair of split inner races, and a row of balls on each end of the cartridge. The dynamic cartridge model utilizes the discrete element method in which each of the bearing components (i.e., races, balls, and cages) has six degrees-of-freedom. The rotor is modeled using the explicit finite element method. The cartridge and rotor models are coupled such that the motion of the flexible rotor is transmitted to the inner races of the cartridge with the corresponding reaction forces and moments from the bearings being applied to the rotor. The coupled rotor–cartridge model was used to investigate the shaft motion and bearing dynamics as the system traverses critical speeds. A comparison of the analytical and experimental shaft motion results resulted in minimal correlation but showed similarity through the critical speeds. The cartridge model allowed for thorough investigation of bearing component dynamics. Effects of ball material properties were found to have a significant impact on turbocharger rotor and bearing dynamics.

Online Vibration Monitoring Of Ball Bearing Damage Using an Experimental Test Rig

2007 ◽  
Vol 23 (3) ◽  
pp. 629-636 ◽  
Author(s):  
Fred K. Choy ◽  
Lei Wang ◽  
Jianyou Zhou ◽  
Minel J. Braun
Keyword(s):  
Experimental Test ◽  
Ball Bearing ◽  
Vibration Monitoring ◽  
Test Rig ◽  
Bearing Damage ◽  
Experimental Test Rig

Experimental research on cage motion with different pocket shapes in angular contact ball bearing

2021 ◽  
pp. 135065012110593
Author(s):  
Dujuan Yuan ◽  
Ruixiang Wang ◽  
Shijin Chen ◽  
Xiaoyang Chen
Keyword(s):  
Experimental Research ◽  
Ball Bearing ◽  
Slip Rate ◽  
Operating Conditions ◽  
Radial Load ◽  
Test Rig ◽  
Angular Contact Ball Bearing ◽  
Slip Rates ◽  
Rotating Speed ◽  
Displacement Sensors

The cage motion with different pocket shapes, such as spherical, square, and cylindrical, in an angular contact ball bearing under different operating conditions are studied experimentally. A test rig with two laser displacement sensors is used to obtain the displacements of the cage in five freedom degrees. The results reveal that these three type cage shapes have different trends of the centroid trajectory versus rotating speed or radial load. The whirling radius is equal to half of the pocket clearance for the spherical pocket, and half of the guiding clearance for both square and cylindrical pocket. The slip rates of all cages decrease with increasing radial load, and increase with rotating speed. Both inclination angel and slip rate of the spherical, cylindrical and square pocket decrease in turn.

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