Numerical Investigations on the Sealing Performance of a Reciprocating Seal Based on the Inverse Lubrication Method

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Jun Wang ◽  
Yongkang Li ◽  
Zisheng Lian
Keyword(s):  
Finite Element ◽  
Fluid Transport ◽  
Hydrodynamic Lubrication ◽  
Finite Element Models ◽  
Asperity Contact ◽  
Interference Fit ◽  
New Approach ◽  
Numerical Investigations ◽  
Sealing Performance ◽  
Film Profile

The work presented in this paper describes a new approach to calculate the film profile, friction, and fluid transport of a reciprocating U-cup seal used in a hydraulic piston pump. An innovative partial lubrication model of the seal is developed, which connects the inverse hydrodynamic lubrication method and Greenwood–Williamson asperity contact model. Finite element models (FEM) were established to simulate deformation behavior under-mounted and pressurized process using finite element code ansys. Based on the finite element simulations, corresponding numerical calculations have been made using the matlab with the inverse hydrodynamic lubrication and asperity contact theories. The accuracy of these models was validated against existing experimental data to ensure that they can predict the sealing performance sufficiently. The effects of the operating parameters as well as the magnitude of interference on the sealing performance in terms of friction, fluid transport, and film thickness were discussed. The results of the simulation indicate that the interference fit, sealed pressure, and rod velocity play significant roles to improve the wear and seizure resistance capability that is critical to the service life of the seal.

A new approach for assigning bone material properties from CT images into finite element models

2010 ◽  
Vol 43 (5) ◽  
pp. 1011-1015 ◽  
Author(s):  
G. Chen ◽  
B. Schmutz ◽  
D. Epari ◽  
K. Rathnayaka ◽  
S. Ibrahim ◽  
...  
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Ct Images ◽  
Finite Element Models ◽  
Bone Material ◽  
New Approach ◽  
Bone Material Properties

Numerical Modelling of the Initial Stress and Upward Deflection of Glulam Beams Pre-Stresseed by Compressed Wood

2014 ◽  
Vol 493 ◽  
pp. 408-413 ◽  
Author(s):  
Buan Anshari ◽  
Zhong Wei Guan
Keyword(s):  
Finite Element ◽  
Initial Stress ◽  
Finite Element Models ◽  
Lower Grade ◽  
Initial Stress State ◽  
New Approach ◽  
Linear Finite Element ◽  
Compressive Stresses ◽  
Upward Deflection ◽  
Compressed Wood

A new approach to reinforce glulam timber beams has been developed by using compressed wood (CW) which is made of a lower grade wood through densification processes. In the reinforcing practice, compressed wood blocks are inserted into pre-cut holes on the top of glulam beams to produce pre-camber and to generate initial tensile and compressive stresses on the top and the bottom extreme fibre of the glulam beam. In order to optimize the size, the number and the location of CW blocks, 3-D finite element models have been developed. 3D non-linear finite element models have been developed to simulate the pre-camber of Glulam beams locally reinforced by compressed wood blocks. The models developed have also produced the initial tensile and compressive stresses at the top and bottom extreme fibres with building-up moisture-dependent swelling on the CW blocks. With the pre-camber and the initial stress state that cancel out proportions of working deflection and stresses.

A General Formulation for Designing Interference-Fit Joints With Elastic-Plastic Components

2004 ◽  
Vol 126 (4) ◽  
pp. 737-743 ◽  
Author(s):  
Niccolo` Baldanzini
Keyword(s):  
Finite Element ◽  
Material Characterization ◽  
Iterative Procedure ◽  
Yield Criterion ◽  
Theoretical Models ◽  
Finite Element Models ◽  
Interference Fit ◽  
Wide Applicability ◽  
Elastic Plastic ◽  
Plastic Components

A general approach for designing interference-fit joints constituted of elastic-plastic components is presented. The wide applicability range of the method was achieved removing restrictive assumptions about material characterization and yield criterion, which were included in previous theoretical models. Because of the general approach, the model is solved with an iterative procedure. The theory has been successfully validated by a result comparison with finite element models.

Effects of Damping and Varying Contact Area at Blade-Disc Joints in Forced Response Analysis of Bladed Disc Assemblies

2005 ◽  
Author(s):  
E. P. Petrov ◽  
D. J. Ewins
Keyword(s):  
Large Scale ◽  
Normal Load ◽  
Forced Response ◽  
Response Analysis ◽  
Finite Element Models ◽  
Friction Contact ◽  
Contact Conditions ◽  
New Approach ◽  
Numerical Investigations ◽  
Unilateral Contacts

In this paper, an approach is developed to analyse the multiharmonic forced response of large-scale finite element models of bladed discs taking account of the nonlinear forces acting at the contact interfaces of blade roots. Area contact interaction is modelled by area friction contact elements which allow for friction stresses under variable normal load, unilateral contacts, clearances and interferences. Examples of application of the new approach to analysis of root damping and forced response levels are given and numerical investigations of effects of contact conditions at root joints and excitation levels are explored for practical bladed discs.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

A Finite Element Analysis of the General Rolling Contact Problem for a Viscoelastic Rubber Cylinder

1988 ◽  
Vol 16 (1) ◽  
pp. 18-43 ◽  
Author(s):  
J. T. Oden ◽  
T. L. Lin ◽  
J. M. Bass
Keyword(s):  
Finite Element ◽  
Variational Principles ◽  
Standing Waves ◽  
Rolling Contact ◽  
Finite Element Models ◽  
Viscoelastic Cylinder ◽  
Element Analysis ◽  
Elastic Rubber ◽  
Frictional Effects ◽  
Rough Foundation

Abstract Mathematical models of finite deformation of a rolling viscoelastic cylinder in contact with a rough foundation are developed in preparation for a general model for rolling tires. Variational principles and finite element models are derived. Numerical results are obtained for a variety of cases, including that of a pure elastic rubber cylinder, a viscoelastic cylinder, the development of standing waves, and frictional effects.

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