An Endoscopic Grasper Tool With Integrated Tactile Sensors for Use in Minimally Invasive Surgery

Volume 3 ◽  
2004 ◽  
Author(s):  
Javad Dargahi ◽  
Siamak Najarian
Keyword(s):  
Dynamic Range ◽  
Light Emitting Diode ◽  
Three Dimensional ◽  
Tactile Sensor ◽  
Tactile Sensors ◽  
Light Emitting ◽  
Force Magnitude ◽  
Dimensional Finite Element ◽  
Amplification System ◽  
Three Dimensional Finite Element

In this paper, we report on the design, testing, fabrication, and modeling of a semiconductor-based microstrain gauge endoscopic tactile sensor. This sensor is capable of measuring both the magnitude and the position of an applied load on a commercial endoscopic grasper tool. It consists of two microstrain gauge sensors, placed on the prototype endoscopic grasper. A light emitting diode device is used to visually see the intensity of the applied force. In total, 20 different force magnitudes for 7 different locations on the endoscopic grasper are tested experimentally. The range of force magnitude changes in the domain of 0.5 N to 10 N. The in-house electrical amplification system for the microstrain gauges is also designed, fabricated, and tested. The sensor is insulated and can operate safely in wet environments. The designed sensor assembly exhibits high force sensitivity, good linearity, and large dynamic range. A three-dimensional finite element modeling (FEM) is employed to predict the behavior of the designed system. Based on FEM results, there is a good agreement between these data the results obtained experimentally.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Tire Modeling by Finite Elements

1992 ◽  
Vol 20 (1) ◽  
pp. 33-56 ◽  
Author(s):  
L. O. Faria ◽  
J. T. Oden ◽  
B. Yavari ◽  
W. W. Tworzydlo ◽  
J. M. Bass ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rolling Contact ◽  
Test Problems ◽  
State Behavior ◽  
Normal Contact ◽  
New Developments ◽  
Applied Torque ◽  
Dimensional Finite Element ◽  
Tire Modeling ◽  
Three Dimensional Finite Element

Abstract Recent advances in the development of a general three-dimensional finite element methodology for modeling large deformation steady state behavior of tire structures is presented. The new developments outlined here include the extension of the material modeling capabilities to include viscoelastic materials and a generalization of the formulation of the rolling contact problem to include special nonlinear constraints. These constraints include normal contact load, applied torque, and constant pressure-volume. Several new test problems and examples of tire analysis are presented.

Sign in / Sign up

Export Citation Format

Share Document