Finite Element Analysis of Dynamically Loaded Journal Bearings: Influence of the Bolt Preload

2002 ◽  
Vol 124 (3) ◽  
pp. 486-493 ◽  
Author(s):  
Fabrizio A. Stefani ◽  
Alessandro U. Rebora
Keyword(s):  
Combustion Process ◽  
Elastic Behavior ◽  
Connecting Rod ◽  
Element Analysis ◽  
Fem Model ◽  
Bolt Preload ◽  
Marine Diesel ◽  
Newton Raphson ◽  
Raphson Method ◽  
Murty's Algorithm

An improved FEM model was developed to simulate the elastic behavior of a connecting rod bearing, accounting for the displacements caused by the tightening torque applied to the bolts that join the cap and the rod. These initial displacements are added to the pressure induced displacements, to enhance the solution of the elastohydrodynamic bearing lubrication problem. The big end bearing of a marine diesel engine was modeled and analyzed under combustion process loads and inertia loads using the Newton-Raphson method together with the Murty’s algorithm. Some important differences between these results and other results published for the same bearing without the bolt preload are identified and discussed.

EHD Analysis, Including Structural Inertia Effects and a Mass-Conserving Cavitation Model

1995 ◽  
Vol 117 (3) ◽  
pp. 540-547 ◽  
Author(s):  
D. Bonneau ◽  
D. Guines ◽  
J. Freˆne ◽  
J. Toplosky
Keyword(s):  
General Motors ◽  
Connecting Rod ◽  
Cavitation Model ◽  
Inertia Effects ◽  
Structural Inertia ◽  
Newton Raphson ◽  
Inertia Forces ◽  
Raphson Method ◽  
Murty's Algorithm ◽  
Isoparametric Elements

The dynamic behavior of two elastic connecting-rod bearings is studied. The Newton-Raphson method and 8-node isoparametric elements for the lubrication analysis are used. For the structural analysis, 3-D elasticity assumptions are made and 20 nodes isoparametric elements are used. Inertia forces due to the kinematics of the structure are incorporated with the effects of the hydrodynamic pressures in the elastic deformations of the bearing. Comparisons with Goenka‘s results are presented for the General Motors connecting-rod bearing. A mass-conserving model used in conjunction with Murty‘s algorithm is presented for the transient evolution of the cavitation area. This model is applied for the EHD study of a Renault connecting-rod bearing.

The Calculation of Fourth-Rank Constitutive Parameters of Consistent Tangent Modulus and Plastic Modulus in Finite Element Analysis

2013 ◽  
Vol 850-851 ◽  
pp. 800-803
Author(s):  
Xiao Hui Chen ◽  
Lian Jie Ma
Keyword(s):  
Tangent Modulus ◽  
Ansys Software ◽  
Element Analysis ◽  
Plastic Modulus ◽  
Stress Integration ◽  
Global Equilibrium ◽  
Newton Raphson ◽  
Constitutive Parameters ◽  
Raphson Method ◽  
Kim Model

Newton-Raphson method is used in global equilibrium for the numerical solution of elasto-plastic problems. It is necessary to determine the fourth-rank constitutive parameters of consistent tangent modulus in each integration point. Euler backward method and implicit stress integration is applied while constitutive model is implemented into ANSYS software. Take Chen, Jiao, and Kim model (2005) as an example, comparison of fourth-rank constitutive parameters and without fourth-rank constitutive parameters of consistent tangent modulus indicates that the convergence is obviously influenced by fourth-rank constitutive parameters of consistent tangent modulus for the larger load case, whereas the influence of plastic modulus is almost neglected.

Finite Element Analysis and Research of Engine Connecting Rod

2014 ◽  
Vol 915-916 ◽  
pp. 142-145 ◽  
Author(s):  
Qing Qian Zheng ◽  
Bin Yang ◽  
Hui Min Yang ◽  
Min Hu
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Nonlinear Analysis ◽  
Connecting Rod ◽  
Element Analysis ◽  
Fem Model ◽  
3D Finite Element ◽  
3D Finite Element Method

The 3D Finite Element Method (FEM) model of engine connecting rod was established in this paper. And, nonlinear analysis of engine connecting rod was made, Stress distribution of the connecting rod under condition of maximum stretching and maximum compressing was simulated. The result shows that the results coincide with the actual results and connecting rod can satisfy the strength requirement, the method turns out to be very effective in practice.

Finite Element Analysis of Dynamically Loaded Flexible Journal Bearings: A Fast Newton-Raphson Method

1989 ◽  
Vol 111 (4) ◽  
pp. 597-604 ◽  
Author(s):  
J. D. C. McIvor ◽  
D. N. Fenner
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computing Time ◽  
Journal Bearings ◽  
Element Analysis ◽  
Dynamically Loaded ◽  
Newton Raphson ◽  
Time Required ◽  
Raphson Method ◽  
Isoparametric Elements

A fast Newton-Raphson method is presented for the finite element analysis of dynamically loaded flexible journal bearings. The method makes use of 8-node isoparametric elements for the lubrication analysis and 20-node isoparametric elements for the structural analysis. Results are presented for the Ruston and Hornsby 6VEB Mk III marine diesel big-end bearing using this method. The computing time required for this analysis is more than two orders of magnitude less than that previously reported for an elastohydrodynamic bearing analysis using a conventional Newton-Raphson method.

Influence of Thermal and Elastic Deformations on Connecting-Rod Big End Bearing Lubrication Under Dynamic Loading

1999 ◽  
Vol 122 (1) ◽  
pp. 181-191 ◽  
Author(s):  
S. Piffeteau ◽  
D. Souchet ◽  
D. Bonneau
Keyword(s):  
Finite Element ◽  
Dynamic Loading ◽  
Numerical Procedure ◽  
Element Formulation ◽  
Heat Transfer Equation ◽  
Connecting Rod ◽  
Elastic Deformations ◽  
Newton Raphson ◽  
Energy Equations ◽  
Raphson Method

A numerical procedure is developed for the analysis of transient thermoelastohydrodynamic (TEHD) behavior of connecting-rod bearings under dynamic loading. The Reynolds and energy equations in the film and heat transfer equation in the solids are all solved using the Newton-Raphson method and the finite element formulation. The finite element meshes of the three domains are interconnected, and so the heat flux continuity conditions become implicit. As a consequence, the study of complicated structures, such as actual connecting-rod bearings, can be handled and boundary conditions can easily be changed. [S0742-4787(00)02301-8]

scholarly journals Investigation of the contact zone of a cylindrical shell located between two parallel rigid plates with a gap

2020 ◽  
Vol 12 (S) ◽  
pp. 43-52
Author(s):  
Arseniy V. BABAYTSEV ◽  
Lev N. RABINSKIY ◽  
Kyaw Thu AUNG
Keyword(s):  
Cylindrical Shell ◽  
Contact Zone ◽  
Applied Pressure ◽  
Transcendental Equation ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Newton Raphson ◽  
Discharge Pressure ◽  
Raphson Method ◽  
Ansys Workbench

The article presents the results of a study of the contact zone of a thin-walled cylindrical shell located between two parallel rigid plates. The shell under consideration was located with various gaps from the rigid plate and was subsequently subjected to internal pressure. In the course of such a study, experimental, numerical and analytical estimates of the contact zone width were obtained depending on the discharge pressure. The obtained numerical and analytical estimates are tested with experiment. To study the width of the contact zone, depending on the gap, a testing workbench was used. The problem of numerical and analytical modelling was solved by the finite element analysis in the Ansys Workbench system. The solution to transcendental equation was found numerically using the Newton-Raphson method. As a result of experimental, numerical and analytical studies, results were obtained for a plane-oval shell with gaps of 0.5 mm, 1 mm and 2 mm, depending on the applied pressure.

An Optimum Short Bearing Theory for the Elastohydrodynamic Solution of Journal Bearings

1986 ◽  
Vol 108 (2) ◽  
pp. 294-298 ◽  
Author(s):  
P. K. Goenka ◽  
K. P. Oh
Keyword(s):  
Finite Difference Methods ◽  
Computation Time ◽  
Axial Direction ◽  
Approximate Solutions ◽  
Connecting Rod ◽  
Governing Equations ◽  
Ehd Lubrication ◽  
Separation Of Variable ◽  
Raphson Method ◽  
Murty's Algorithm

An approximate method for solving the elastohydrodynamic (EHD) lubrication problem has been developed. The method is based on two assumptions: the separation of variable for pressure and a parabolic pressure distribution in the axial direction. To solve the governing equations, the Newton-Raphson method, in conjunction with Murty’s algorithm, is used. The finite-element and the finite-difference methods are then used to obtain approximate solutions. The rod bearing of a typical connecting rod is analyzed by the new method. The results are compared to the full EHD solution and the rigid bearing solution. Significant reduction in computation time is realized when compared to the full EHD solution.

Application of an Improved Trust-Region Method to Rigid-Plastic Finite Element Analysis in Strip Rolling

2011 ◽  
Vol 704-705 ◽  
pp. 216-222
Author(s):  
Shu Ni Song ◽  
Jing Yi Liu ◽  
Jin Qian
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computational Time ◽  
Damping Factor ◽  
Strip Rolling ◽  
Rigid Plastic ◽  
Element Analysis ◽  
Online Application ◽  
Newton Raphson ◽  
Raphson Method

Rigid-plastic finite element analysis (RPFEA) is an efficient and practical method to calculate rolling parameters in the strip rolling process. To solve the system of simulations equations involved in the RPFEA, a numerous of numerical methods, including the standard Newton-Raphson method, the modified Newton-Raphson method, and etc., have been proposed by different researchers. However, the computational time of the existed numerical methods can not meet the requirement of the online application. By tracking the computational time consumption for the main components in the standard Newton-Raphson method used in finite element analysis, it was found that linear search of damping factor occupies the most of the computational time. Thus, more efforts should be put on the linear search of damping factor to speed up the solving procedure, so that the online application of RPFEA is possible. In this paper, an improved trust-region method is developed to speed up the solving procedure, in which the Hessian matrix is forced to positive definite so as to improve the condition number of matrix. The numerical experiments are carried out to compare the proposed method with the standard Newton-Raphson method based on the practical data collected from a steel company in China. The numerical results demonstrate that the computational time of the proposed method outperforms that of the standard Newton-Raphson method and can meet the requirement of online application. Meanwhile the computational values of rolling force obtained by the proposed method are in good agreement with experimental values, which verifies the validity and stability of the proposed method.

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