Fiber Bragg Grating-Based Oil-Film Pressure Measurement in Journal Bearings

2019 ◽  
Vol 68 (5) ◽  
pp. 1575-1581
Author(s):  
Boxin Mu ◽  
Ruixuan Qu ◽  
Tao Tan ◽  
Ye Tian ◽  
Quan Chai ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Pressure Measurement ◽  
Journal Bearings ◽  
Bragg Grating ◽  
Film Pressure ◽  
Oil Film ◽  
Oil Film Pressure

Experimentally study of dynamic pressure distribution and oil film forces in journal bearing using ElectroMechanical Film sensor array

2019 ◽  
Vol 234 (4) ◽  
pp. 903-913
Author(s):  
Changmin Chen ◽  
Jianping Jing ◽  
Jiqing Cong ◽  
Chao Ji
Keyword(s):  
Pressure Distribution ◽  
Sensor Array ◽  
Journal Bearing ◽  
Dynamic Pressure ◽  
Vertical Direction ◽  
Journal Bearings ◽  
Film Sensor ◽  
Film Pressure ◽  
Oil Film ◽  
Oil Film Pressure

The acquisition of the oil film pressure and forces on the bearing pads through experimentation is crucial to understanding the characteristics of journal bearing. Lots of efforts had been taken in film pressure measurement, and the pressure was obtained at specified position on the bearing pads. However, due to the space and structure constraint, merely very limited number of the point pressure can be obtained with traditional sensors and acquiring the detail pressure field on whole bearing pad surface is still an open challenge. In this paper, a method based on thin-film sensors technique is proposed and employed to measure the pressure distribution and oil film forces of journal bearings. The measurement is conducted on a cylindrical journal bearing with two axial grooves, and ElectroMechanical Film sensor arrays are designed and laid on the surface of the bearing pads. The oil film pressure is acquired at up to 32 measurement points in total along the bearing pads in both circumference and axial directions. The pressure distribution in a wide rotation speed range is obtained successfully by using fitting algorithm. Furthermore, the oil film forces on horizon and vertical direction are obtained through the integration of the measured pressure filed. The test results prove that it is feasible to measure the oil pressure filed of journal bearings using ElectroMechanical Film piezo-film sensor array.

scholarly journals Testing of bearing materials for large two-stroke marine diesel engines

2016 ◽  
Vol 231 (4) ◽  
pp. 503-508
Author(s):  
Anders Voelund ◽  
Peder Klit ◽  
Sebastian Persson
Keyword(s):  
Fatigue Test ◽  
Diesel Engines ◽  
Rotational Speed ◽  
Journal Bearings ◽  
Test Rig ◽  
Film Pressure ◽  
Oil Film ◽  
Lining Material ◽  
Marine Diesel ◽  
Oil Film Pressure

In large two-stroke marine diesel engines, bearings are designed to last the lifetime of the engine. The design has shown very good service experiences. The design parameters of the main bearings are, among others, based on the average maximum specific load which the bearing should operate under. In general, the frictional loss is less than 1% of the nominal power of the engine but is still a target for optimization. Fatigue mechanisms of bearing lining material are not fully understood and the design limits with regards to minimum oil film thickness, max oil film pressure and oil film pressure gradient are not established. Large two-stroke journal bearings are not suitable for fatigue test due to the size, the low rotational speed and the complexity of such a test-rig. The disc fatigue test rig was designed with the purpose to test white metal coatings under realistic bearing conditions, in a confined time-frame. The test-rig simulates a scale model of a thrust bearing, in contrary to standard design, the bearing lining material is applied to the rotating collar. Parameters, such as bearing load, rotational speed, oil temperature, oil contamination is controlled/monitored in order to achieve repeatability and a systematic approach to the experiments. Test performed on the test-rig shows good correlation on the fatigue cracks with those experienced on large two-stroke journal bearings.

Experimental study for performance evaluation of steadily loaded true elliptical and orthogonally displaced non-circular journal bearing profiles

2016 ◽  
Vol 68 (6) ◽  
pp. 702-711 ◽  
Author(s):  
Amit Singla ◽  
Amit Chauhan
Keyword(s):  
Experimental Study ◽  
Thermal Performance ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Maximum Temperature ◽  
Positive Pressure ◽  
Film Pressure ◽  
Content Type ◽  
Oil Film ◽  
Oil Film Pressure

Purpose The non-circular journal bearings may be used over circular journal bearings because of their superior thermal stability. The paper aims at experimental study of thermal performance of two different true elliptical and orthogonally displaced non-circular journal bearing profiles. Design/methodology/approach The experiments have been conducted on a specially designed test rig which simultaneously evaluates oil film pressure and temperature along the circumference of non-circular journal bearing. The tests are conducted for the designed true elliptical and orthogonally displaced journal bearing at three different rotational speeds of 2,000, 3,000 and 4,000 rpm under the influence of steadily applied load varied from 0.5 to 2.0 kN. The data collected during experimentation have been used to evaluate thermal performance parameters such as maximum pressure, flow rate and effective temperature of the bearings under study. Findings It has been observed experimentally that two lobes of pressure and temperature have been obtained for both the elliptical and orthogonally displaced journal bearing. The negative pressure zone (cavitation area) has been observed to be reduced along the circumference for both the journal bearings which results in less thermal degradation of an oil as compared to circular journal bearing. The oil film pressure and temperature increases with the increase in radial load of both the bearings. The maximum temperature rise of oil film is more in case of elliptical bearing as compared to the orthogonally displaced bearing. Originality/value The experimental data presented in this paper will help the designers to select such kind of non-circular journal bearing for various applications. The designed bearings have resulted in reduced cavitation zone and two positive pressure lobes have been observed which may result in application of such bearings as an alternate for circular journal bearing.

Embedded Optical Sensor for Oil Film Pressure Measurements in Journal Bearings

2008 ◽  
Author(s):  
Helena Ronkainen ◽  
Antti Valkonen ◽  
Markku Kapulainen ◽  
Varjus Simo ◽  
Ari Hokkanen ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Journal Bearing ◽  
Theoretical Calculations ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Dynamic Loads ◽  
Sensor Design ◽  
Film Pressure ◽  
Oil Film ◽  
Oil Film Pressure

The oil film pressure is one of the essential functional parameters in journal bearings. Until now, the oil film pressure has been estimated by theoretical calculations, since the measurement of oil film pressure has been a demanding or even unfeasible task in journal bearings, especially in bearings carrying dynamic loads. In this study a new approach has been developed for experimental determination of the oil film pressure. The sensor design utilizes the optical fibre technique and the sensor is integrated in the sliding surface of the bearing thus providing the possibility to measure the actual oil film pressure under load. The finite element method (FEM) calculations have been used for optimizing the design of the sensor and for ensuring the appropriate mechanical performance of the sensor design. The optical sensor was integrated in a hydrodynamic journal bearing made of bronze. A versatile bearing test rig was used for testing the journal bearing with integrated optical sensor. The tests were carried out with both static and dynamic loading. The oil film pressure was measured with different loads and speeds and the data was compared with simulated one. The results showed that the optical sensor was capable to measure the oil film pressure in journal bearing at real operating conditions and the sensitivity of the sensor was good enough to verify the speed and load effects on pressure. According to this work, it is possible to increase the knowledge of true operating conditions of journal bearings by using the optical sensor for oil film pressure measurement. The knowledge can be utilized in the development work of safer and more efficient machines and engines with journal bearings carrying high and dynamic loads. The optical sensor can be used also in other applications for smart control of pressure.

Experimental Analysis of Dynamic Oil Film Pressure of Tilting-Pad Journal Bearings

2016 ◽  
Vol 63 (3) ◽  
Author(s):  
Jiexi Shen ◽  
Xin Xiong ◽  
Guoping Li ◽  
Xiaojing Wang ◽  
Zikai Hua ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Journal Bearings ◽  
Film Pressure ◽  
Oil Film ◽  
Tilting Pad ◽  
Tilting Pad Journal Bearings ◽  
Oil Film Pressure
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