Workspace Comparison Between 3-PRR and 3-RPR Micro-Manipulator

2012 ◽  
Author(s):  
Yi Dong ◽  
Feng Gao ◽  
Yi Yue ◽  
Jin Feng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degrees Of Freedom ◽  
The Other ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Structural Differences ◽  
Micro Manipulator

This paper presents two compliant micro-manipulators with different structures. One uses 3-PRR mechanism while the other one adopts 3-RPR mechanism. Both of the two micro-manipulators have two translational degrees of freedom (DOF) and one rotational DOF. But the properties, such as workspace, of the two micro-manipulators are not the same. In this paper, the workspaces are studied and compared. First, the structural differences are presented. Then, the stiffness derivations of the two micro-manipulators are given and the workspaces are calculated considering the properties of piezoelectric (PZT) actuators. Finally the finite element analysis and prototype experiments are performed to validate the obtained results.

scholarly journals ANALYSIS OF SPOT WELDING ELECTRODE

2013 ◽  
pp. 263-268
Author(s):  
RAJANARENDER REDDY PINGILI
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
The Other ◽  
Element Analysis ◽  
Resistance Spot ◽  
Electrode Shape ◽  
The Finite Element Analysis ◽  
Welding Electrode

Electric resistance spot welding has been extensively used for many years in the automotive and aerospace industry for joining body sheet components. Compared to other welding processes such as arc welding process, resistance spot welding is fast, easily automated and easily maintained. Accurate thermal analysis of spot welding electrode could permit critical design parameters to be identified for improved electrode life. It is a complex process where coupled interactions exist between electrical, thermal and mechanical phenomena. On the other hand, finite element method (FEM), which can deal with nonlinear behaviors and complex boundary conditions, provides a powerful tool for studying these interactions and has become the most important method for the analysis of resistance spot welding. In this study, a 2-D finite element model has been developed to predict the transient thermal behavior of spot welding electrodes. The model included heat transfer analysis, electrical field analysis and phase change during melting or solidification and temperature dependant material properties, and also their inter-dependence. The contacts at faying surface and at electrode – work interface, with temperature dependant contact resistances were modeled. Three types of electrode shapes – flat, pointed and dome nose were analyzed. Temperature distribution on each electrode shape was obtained from the finite element analysis. Maximum temperature of 2876 ºC was observed in dome nose electrode in 0.2 seconds of welding time. Dome nose electrode requires a minimum weld time of all the other electrode shapes to get the required nugget size, resulting in the least power consumption. Nugget size was predicted for each electrode shape. Experimental results obtained were in good agreement with the finite element analysis results.

Mechanical Behavior of Hollow Steel-Concrete Composite Columns with Perforated Ribs

2011 ◽  
Vol 255-260 ◽  
pp. 619-623
Author(s):  
Yao Zeng ◽  
Chong Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Bearing Capacity ◽  
The Other ◽  
Element Analysis ◽  
Composite Columns ◽  
The Finite Element Analysis ◽  
The One ◽  
Relationship Of

Two different specimens of hollow composite columns with perforated ribs, one is the column with double steel skin and the other is with single steel skin, were designed for imposing axial compression test. The tests indicated that both of the columns have a good bearing capacity and the column with double steel skin has a comparatively better bearing capacity than the one with single steel skin. Then comparisons between tests and finite element analysis (FEA) were preceded, which showed that not only the load-displacement relationship of the columns, but also a reasonable failure mode can be simulated by the finite element analysis.

Stability of mirror chambers and mechanics: an example of the improvement of vibrational behaviour

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
C. Ruget ◽  
L. Nikitina ◽  
J. Nicolas ◽  
J.C. Martinez ◽  
J. Juanhuix
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degrees Of Freedom ◽  
High Stability ◽  
Element Analysis ◽  
Detailed Design ◽  
The Finite Element Analysis ◽  
Synchrotron Light ◽  
High Level ◽  
Low Emittance

ALBA synchrotron light facility includes a 3 GeV low-emittance storage ring capable of running in the top-up mode which will feed a number of beamlines. Xaloc and CIRCE are among these beamlines. These beamlines are equipped with mirrors which need high stability. There are a lot of mirror chambers in the market and we decided to improve one of them rather than developing a new one. For this purpose, the ALBA team organized a collaboration with a supplier of beamline components. ALBA did the conceptual design of the improvements, the Finite Element Analysis (FEA) optimization and the metrology tests. The supplier provided a detailed design and the production. The improvement was implemented on several mirror chambers including actuators from two to five degrees of freedom. At the beginning of the project, the hypothesis was an excitation coming from the ground lower than 1 µm for frequencies below 45 Hz and negligible above it. The strategy[0] in terms of dynamical stability was not to amplify the ground excitation below 45 Hz or around 50 Hz. That is, to increase the frequency of the system resonances above 45 Hz (excluding the range of about 50 Hz). As a result, we obtained a high level of stability for such mirror systems and we almost met the target value for the first mode of vibration.

A Study of Mechanical Property of Eggshell with Inverse Method and Finite Element Analysis

2018 ◽  
Vol 775 ◽  
pp. 542-546
Author(s):  
Jetsadaporn Priyadumkol ◽  
Chakrit Suvanjumrat
Keyword(s):  
Mechanical Property ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Inverse Method ◽  
Optimization Method ◽  
The Other ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Chicken Eggshell ◽  
Coupling Calculation

This research proposed an inverse method to calculate the mechanical property of a chicken eggshell. The optimization method had been performed to determine the simulated results of the finite element analysis in order to predict Young’s Modulus of the eggshell. To obtain an accurate mechanical property of the eggshell, the finite element analysis was verified by comparison with the experimental results. There was found that the error of the coupling calculation method between the inverse method and finite element method was less than 0.1%. Consequently, the inverse method and finite element analysis can be used to determine the mechanical property of the other eggshell types in the further work.

The Finite Element Analysis of Reducing Diameter of Centrifuge Pipe Mould by Hot Extrusion Process

2012 ◽  
Vol 538-541 ◽  
pp. 576-579
Author(s):  
Jing Long Fan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
The Other ◽  
Element Analysis ◽  
Extrusion Processing ◽  
The Finite Element Analysis ◽  
3D Deformation ◽  
Thermal Extrusion

In this paper, based on elastic-plastic and thermal-stress coupling finite element method (FEM), the centrifuge pipe mould was molded by Pro/E, and imported into the MARC after meshing, and performed finite element analysis to extrusion stability and the process of hot extrusion by MARC. By summarizing the 3D deformation regulation of the hot extrusion centrifuge pipe mould, the stress changing and mechanical property parameters during the process of hot extrusion , providing reference for the design of equipment in radial hot extrusion. At last, the study could be useful for the device design of radial hot extrusion of the centrifuge pipe mould. At the same time, this method could be use to analyze the other relative thermal extrusion processing.

Interactive Graphics for the Analysis of Tires

1985 ◽  
Vol 13 (3) ◽  
pp. 127-146 ◽  
Author(s):  
R. Prabhakaran
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Approximate Solutions ◽  
Interactive Graphics ◽  
Element Analysis ◽  
Analysis Process ◽  
Physical Problems ◽  
The Finite Element Analysis ◽  
Analysis Computer ◽  
Discretization Technique

Abstract The finite element method, which is a numerical discretization technique for obtaining approximate solutions to complex physical problems, is accepted in many industries as the primary tool for structural analysis. Computer graphics is an essential ingredient of the finite element analysis process. The use of interactive graphics techniques for analysis of tires is discussed in this presentation. The features and capabilities of the program used for pre- and post-processing for finite element analysis at GenCorp are included.

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.

Use of the Finite Element Analysis Method in Pedodontics

2018 ◽  
Vol 55 (4) ◽  
pp. 666-675
Author(s):  
Mihaela Tanase ◽  
Dan Florin Nitoi ◽  
Marina Melescanu Imre ◽  
Dorin Ionescu ◽  
Laura Raducu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Model ◽  
Analysis Method ◽  
Ansys Software ◽  
Concentrated Force ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
The Finite Element Analysis ◽  
Solid Type

The purpose of this study was to determinate , using the Finite Element Analysis Method, the mechanical stress in a solid body , temporary molar restored with the self-curing GC material. The originality of our study consisted in using an accurate structural model and applying a concentrated force and a uniformly distributed pressure. Molar structure was meshed in a Solid Type 45 and the output data were obtained using the ANSYS software. The practical predictions can be made about the behavior of different restorations materials.

A necessary modification for the finite element analysis of cracked members detection, construction, and justification

2013 ◽  
Vol 83 (7) ◽  
pp. 1087-1096 ◽  
Author(s):  
A. Ranjbaran ◽  
H. Rousta ◽  
M. O. Ranjbaran ◽  
M. A. Ranjbaran ◽  
M. Hashemi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Cracked Members
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