Analysis of the Performance of Chamfered Finite-Length Journal Bearings under Dynamic Loads
Jamali H.U. Sultan H.S. Abdullah O.I. Al-Tamimi A.N.J. Albdeiri M.S. Ruggiero A. AL-Dujaili Z.A.
February 2023MDPI
Mathematics
2023#11Issue 3
Misalignment is one of the most common challenges that the normal operation of journal bearings faces. This type of problem may be the result of a wide range of reasons, such as bearing wear, shaft deformation, and errors related to the manufacturing and installation process. The main undesirable consequences of the misalignment, such as pressure rise and lubricant film reduction, are concentrated on the bearing edges. Therefore, chamfering the bearing edges reduces such misalignment-related drawbacks. This work presents a novel numerical solution to the problem of finite-length journal bearing considering edge chamfering. This solution involves the determination of the levels of lubricant layer thickness and pressure distribution in addition to the journal trajectory under impact load with the related stability limits. The finite difference method is used in this solution, and the equations of motion are also solved numerically using the Runge–Kutta method. The Results of this novel analysis show that chamfering the bearing edges increases the film thickness and reduces pressure spikes associated with the system operation under the case of 3D misalignment. Furthermore, the chamfered bearing shows a wide stability range under impact loads, where the normal bearing is unstable as the critical speed increases by 26.98%, which has positive consequences on the journal’s trajectory.
dynamical systems , journal bearings , mathematical physics , numerical analysis
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Mechanical Engineering Department, College of Engineering, University of Kerbala, Karbala, 56001, Iraq
College of Engineering, University of Warith Al-Anbiyaa, Karbala, 56001, Iraq
Department of Energy Engineering, College of Engineering, University of Baghdad, Baghdad, 10001, Iraq
Institute of Laser and Systems Technologies (iLAS), Hamburg University of Technology (TUHH), Harburger Schloßstraße 28, Hamburg, 21079, Germany
Department of Mechanics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
College of Technical Engineering, Al-Farahidi University, Baghdad, 10001, Iraq
Air Conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University College, Hillah, 51001, Iraq
Department of Industrial Engineering, University of Salerno, Fisciano, 84084, Italy
Mechanical Engineering Department
College of Engineering
Department of Energy Engineering
Institute of Laser and Systems Technologies (iLAS)
Department of Mechanics
College of Technical Engineering
Air Conditioning and Refrigeration Techniques Engineering Department
Department of Industrial Engineering
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