A Finite Element Model for Describing the Effect of Muscle Shortening on Surface EMG

2006 ◽  
Vol 53 (4) ◽  
pp. 593-600 ◽  
Author(s):  
L. Mesin ◽  
M. Joubert ◽  
T. Hanekom ◽  
R. Merletti ◽  
D. Farina
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Surface Emg ◽  
Muscle Shortening

scholarly journals A multiple-layer finite-element model of the surface EMG signal

2002 ◽  
Vol 49 (5) ◽  
pp. 446-454 ◽  
Author(s):  
M.M. Lowery ◽  
N.S. Stoykov ◽  
A. Taflove ◽  
T.A. Kuiken
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Surface Emg ◽  
Emg Signal ◽  
Multiple Layer ◽  
Surface Emg Signal

scholarly journals Predicting electromyographic signals under realistic conditions using a multiscale chemo–electro–mechanical finite element model

2015 ◽  
Vol 5 (2) ◽  
pp. 20140076 ◽  
Author(s):  
Mylena Mordhorst ◽  
Thomas Heidlauf ◽  
Oliver Röhrle
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Motor Neurons ◽  
Tibialis Anterior Muscle ◽  
Element Model ◽  
Surface Emg ◽  
Muscle Fibres ◽  
Emg Signal ◽  
Motor Unit Discharge ◽  
Human Tibialis Anterior Muscle

This paper presents a novel multiscale finite element-based framework for modelling electromyographic (EMG) signals. The framework combines (i) a biophysical description of the excitation–contraction coupling at the half-sarcomere level, (ii) a model of the action potential (AP) propagation along muscle fibres, (iii) a continuum-mechanical formulation of force generation and deformation of the muscle, and (iv) a model for predicting the intramuscular and surface EMG. Owing to the biophysical description of the half-sarcomere, the model inherently accounts for physiological properties of skeletal muscle. To demonstrate this, the influence of membrane fatigue on the EMG signal during sustained contractions is investigated. During a stimulation period of 500 ms at 100 Hz, the predicted EMG amplitude decreases by 40% and the AP propagation velocity decreases by 15%. Further, the model can take into account contraction-induced deformations of the muscle. This is demonstrated by simulating fixed-length contractions of an idealized geometry and a model of the human tibialis anterior muscle (TA). The model of the TA furthermore demonstrates that the proposed finite element model is capable of simulating realistic geometries, complex fibre architectures, and can include different types of heterogeneities. In addition, the TA model accounts for a distributed innervation zone, different fibre types and appeals to motor unit discharge times that are based on a biophysical description of the α motor neurons.

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.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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