A Validated Finite Element Model of Force in Active and Passive Skeletal Muscle

2010 ◽  
Author(s):  
Duane A. Morrow ◽  
Tammy L. Haut Donahue ◽  
Gregory M. Odegard ◽  
Kenton R. Kaufman
Keyword(s):  
Skeletal Muscle ◽  
Finite Element ◽  
Finite Element Model ◽  
Muscle Activation ◽  
Muscle Force ◽  
Transversely Isotropic ◽  
Element Model ◽  
Fea Model ◽  
Constitutive Formulation ◽  
Force Data

A fully 3D, continuum mechanics based model of skeletal muscle, validated against experimental force data, can be used to computationally solve for individual muscle forces. A constitutive formulation, representing muscle as a transversely isotropic, hyperelastic, and isovolumetric material [1] has been implemented in a finite element model (FEM) of passive skeletal muscle and validated against experimental tension measurements [2]. Of further interest is an expanded formulation that will allow for the addition of muscle activation levels on the overall skeletal muscle force generation. The purpose of this study was to expand the FEA model to include muscle activation and validate it with tests of active skeletal muscle tissue at varied lengths.

Validation of a Finite Element Model of Passive Force and Pressure in Skeletal Muscle

2009 ◽  
Author(s):  
Duane A. Morrow ◽  
Tammy L. Haut Donahue ◽  
Gregory M. Odegard ◽  
Kenton R. Kaufman
Keyword(s):  
Skeletal Muscle ◽  
Finite Element ◽  
Muscle Force ◽  
Transversely Isotropic ◽  
Element Model ◽  
Use Of Data ◽  
Element Simulation ◽  
Reaction Forces ◽  
Surrogate Measure ◽  
Pressure Changes

Intramuscular pressure (IMP) has been put forth as a surrogate measure for muscle force. As technological advancements have lead to the creation of smaller IMP microsensors, obtaining IMP readings in the clinic has come closer to becoming a minimally-invasive reality. However, appropriate use of data from these sensors relies upon an understanding of the mechanism of pressure changes within skeletal muscle. To that end, a constitutive model, representing muscle as a transversely isotropic, hyperelastic, and isovolumetric was created [1] for implementation in a finite element simulation. The purpose of this study was to validate this constitutive muscle model with passive elongation tests of skeletal muscle tissue from New Zealand White (NZW) rabbits. Reaction forces and hydrostatic pressures resulting from applied deformations were determined with the finite element modeling (FEM) approach and were compared with previously published experimental data [2].

Modeling of the Holding Force in an Electromagnetic Chuck

1999 ◽  
Vol 122 (3) ◽  
pp. 569-575 ◽  
Author(s):  
Alejandro Felix ◽  
Shreyes N. Melkote ◽  
Yoichi Matsumoto
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Prediction Errors ◽  
Modeling And Prediction ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Force Data ◽  
The Finite Element Model

This paper addresses the modeling and prediction of the normal holding force in an electromagnetic chuck used in precision machining applications. Knowledge of the normal holding force is necessary to determine if a given chuck is capable of preventing workpiece slip during machining. First, an analytic model termed the magnetic circuit model was developed and compared with experimental holding force data. It was found that this model, although simple in form, was limited in its ability to accurately predict the holding force over the entire range of conditions investigated. The discrepancies in the model were attributed to its inability to accurately model the leakage flux and nonuniform distribution of the magnetic flux. A three-dimensional finite element model was then developed to overcome these limitations. Predictions with this model were found to be in better agreement with experiments, yielding prediction errors within 25 percent in most cases. The finite element model also provided an explanation for the observed decrease in the measured holding force at current values beyond a certain threshold. [S1087-1357(00)01503-3]

TOWARDS A 3D FINITE ELEMENT MODEL OF SKELETAL MUSCLE CONCENTRIC AND ECCENTRIC CONTRACTION

2008 ◽  
Vol 41 ◽  
pp. S367
Author(s):  
Ana Alonso-Vázquez ◽  
Angélica Ramírez ◽  
Begoña Calvo ◽  
Manuel Doblaré
Keyword(s):  
Skeletal Muscle ◽  
Finite Element ◽  
Finite Element Model ◽  
Eccentric Contraction ◽  
Element Model ◽  
3D Finite Element ◽  
3D Finite Element Model

Analysis of Elastic Deformation of Axial Foil Hydrodynamic Thrust Bearing Used in Turbine Generator

2011 ◽  
Vol 188 ◽  
pp. 199-202
Author(s):  
Yu Kui Wang ◽  
Z.Q. Zeng ◽  
Zhen Long Wang ◽  
Y.S. Huang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Elastic Deformation ◽  
Thrust Bearing ◽  
Element Model ◽  
Lubricant Layer ◽  
Turbine Generator ◽  
Fea Model ◽  
Set Up ◽  
The Finite Element Model

In this paper, an elastic deformation of the axial foil hydrodynamic thrust bearing used in 100KW gas turbine generator is studied. The finite element model of the foil hydrodynamic thrust bearing was established using Solidworks and ANSYS. The foil hydrodynamic thrust bearing which considered foil deformation was analyzed and calculated based on the results of the approximate calculation. The FEA model considered the interaction of plane foil deformation and wave foil. The wave foil was not hypothesized as the linear distributed spring when set up the finite element model. The ANSYS results have demonstrated that the deformation of foil bearing designed based on the result of numerical calculation can meet the requirement of minimal film thickness of bearing lubricant layer.

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