A Design Methodology for System Parameters Synthesis of Elastic Planar Linkages: Theory

1992 ◽  
Vol 114 (4) ◽  
pp. 536-541 ◽  
Author(s):  
Zine-Eddine Boutaghou ◽  
A. G. Erdman
Keyword(s):  
Design Methodology ◽  
Design Sensitivity ◽  
Element Analysis ◽  
System Parameters ◽  
Sensitivity Equations ◽  
The Finite Element Analysis ◽  
Planar Linkages ◽  
Multi Body ◽  
Four Bar Linkage ◽  
Theoretical Considerations

Existing formulations predict the displacement and stresses in multi-body systems that result from known system parameters. In contrast, the proposed design methodology enables structured selection of system parameters necessary to produce desired elastic displacements, stresses, and frequencies. This design process involves the development of inverse design equations, the finite element analysis, and the design sensitivity equations to obtain converged solutions satisfying desired design constraints. Part 1 (Theory) considers the theoretical considerations involved. Part 2 (Applications) applies the methodology to design a four-bar linkage and a six-bar linkage.

A Design Methodology for System Parameters Synthesis of Elastic Planar Linkages: Applications

1992 ◽  
Vol 114 (4) ◽  
pp. 542-546 ◽  
Author(s):  
Zine-Eddine Boutaghou ◽  
A. G. Erdman
Keyword(s):  
Design Methodology ◽  
Design Sensitivity ◽  
Inverse Design ◽  
Element Analysis ◽  
Analysis And Design ◽  
Dynamic Finite Element ◽  
Dynamic Finite Element Analysis ◽  
Body Dynamics ◽  
Planar Linkages ◽  
Multi Body

The present paper describes the applicability of inverse design equations in conjunction with dynamic finite element analysis and design sensitivity features for multi-body dynamics. Whereas in Part 1 (Theory) of this paper we describe the general methodology with emphasis on an inverse design philosophy, Part 2 (Applications) presented here describes the integration of the total design process. Numerical examples are presented to validate the present developments for the design of multi-body systems.

Design Sensitivity Derivatives for Isoparametric Elements As an Integrated Part of Finite Element Analysis

1990 ◽  
Author(s):  
Kenneth W. Zumwalt ◽  
Mohamed E. M. El-Sayed
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Sensitivity ◽  
Test Cases ◽  
Element Analysis ◽  
Design Sensitivities ◽  
Sensitivity Derivatives ◽  
The Finite Element Analysis ◽  
Isoparametric Elements

Abstract This paper presents an approach for incorporating design sensitivity calculations into the finite element analysis. The formulation depends on the implicit differentiation approach and requires few additional calculations to obtain the design sensitivity derivatives. The implicit differentiation approach is developed and implemented to calculate the design sensitivities for continuum and structural isoparametric elements. To demonstrate the accuracy and robustness of the developed approach some test cases using different structural and continuum element types are presented.

Simplified analysis of iron loss in three-phase transformer considering rotating loss

2013 ◽  
Vol 33 (1/2) ◽  
pp. 74-84
Author(s):  
Yang Liu ◽  
Yanli Zhang ◽  
Dexin Xie ◽  
Baodong Bai
Keyword(s):  
Design Methodology ◽  
Silicon Steel ◽  
Iron Loss ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Content Type ◽  
Three Phase ◽  
The Finite Element Analysis ◽  
Simplified Method ◽  
Property Measurement

Purpose – A simplified method for calculating iron loss of three-phase transformer is proposed in this paper. The rotating iron loss measured from 2-D vector magnetic property measurement system of gain-oriented silicon steel sheet can be taken into account in this method. The paper aims to discuss these issues. Design/methodology/approach – The finite element analysis formulation is combined with the magnetic reluctivity model expressed by diagonal tensor for 2-D nonlinear and anisotropic magnetic problem, while the iron loss is computed in terms of the interpolation of rotational loss curves measured under various loci of controlled magnetic flux density B. Findings – The iron loss of three-phase transformer is obtained by the proposed method. And the calculating iron loss is verified with experimental results. Originality/value – The method presented in this paper enables the iron loss of three-phase transformer to be more accurately calculated and more easily applied, considering the rotational iron loss.

Methodology for Automated Design of Microelectronic Packages

1994 ◽  
Vol 116 (4) ◽  
pp. 274-281 ◽  
Author(s):  
S. D. Rajan ◽  
V. Sarihan ◽  
M. Mahalingam
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Problem ◽  
Design Methodology ◽  
Mechanical Performance ◽  
Problem Formulation ◽  
Automated Design ◽  
Design Sensitivity ◽  
Element Analysis ◽  
Rf Packaging

A general design methodology for the optimal design of electronic packages is presented. The design problem is cast as a nonlinear programming (NLP) problem. Design for critical packaging issues such as thermal and mechanical performance, is automated by combining thermal and mechanical finite element analysis with an NLP optimizer. The major issues such as design problem formulation, model generation or preprocessing, nonlinear finite element analysis, design variable identification, design sensitivity analysis and software implementation are addressed. A case study involving the design of an RF packaging component in communication products illustrates the design methodology implemented in the Automated Design of Electronic Packaging (ADEP) software system.

Multi-Body Dynamics Simulation and Finite Element Analysis of the Car’s Sub-Frame

2012 ◽  
Vol 253-255 ◽  
pp. 2107-2112
Author(s):  
Jian Min Li ◽  
Chuan Yang Sun ◽  
Zhang Cheng Yang ◽  
Zu Xi Yi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Field ◽  
Simulation Method ◽  
Dynamics Simulation ◽  
Element Analysis ◽  
Engine Load ◽  
The Finite Element Analysis ◽  
Body Dynamics ◽  
Multi Body

For the problem that car sub-frame constraint connection complex and effective load more difficult to determine, using finite element and multi-body dynamics ADAMS co-simulation method, Analyzed on a Volkswagen vehicle sub-frame, obtained the accurate load on the sub-frame which are used by engine suspension. The finite element analysis results show that engine load is the greatest impact on the sub-frame stress field, which can be reduced by increasing the area of engine and the sub-frame contacting, thereby prolong the life of sub-frame.

Load Curve Analysis and Load Errors Modeling of Long Span and Heavy Load Crossbeam

2013 ◽  
Vol 658 ◽  
pp. 475-480 ◽  
Author(s):  
Wen Tong Yang ◽  
Rui Luo ◽  
Huai Qing Lu ◽  
Qiang Cheng ◽  
Pei Hua Gu
Keyword(s):  
Analysis Method ◽  
Machine Precision ◽  
Load Curve ◽  
Element Analysis ◽  
Heavy Load ◽  
Long Span ◽  
The Finite Element Analysis ◽  
Body Dynamics ◽  
Geometric Relation ◽  
Multi Body

An approach in obtaining the load curve and load errors of long span and heavy load crossbeam is proposed in this paper. The load curve is achieved based on the finite element analysis method, and a method for load errors modeling is constructed based on the load curve and geometric relation. This method can provide a theoretical basis for the machine precision modeling based on multi-body dynamics.

Gannon Exoskeleton for Arm Rehabilitation (G.E.A.R.)

2015 ◽  
Author(s):  
Davide Piovesan ◽  
Yuvarajan Arumugam ◽  
Corey Jackson ◽  
Santhosh Kumar Shanmugam ◽  
Adam Restifo ◽  
...  
Keyword(s):  
Low Cost ◽  
Passive Movement ◽  
System Stability ◽  
Continuous Passive Motion ◽  
Element Analysis ◽  
Arm Rehabilitation ◽  
Physical Prototype ◽  
Multi Body ◽  
Four Bar Linkage ◽  
Functional Movements

A low cost continuous passive motion (CPM) machine, the Gannon Exoskeleton for Arm Rehabilitation (GEAR), was designed. The focus of the machine is on the rehabilitation of primary functional movements of the arm. The device developed integrates two mechanisms consisting of a four-bar linkage and a sliding rod prismatic joint mechanism that can be mounted to a normal chair. When seated, the patient is connected to the device via a padded cuff strapped on the elbow. A set of springs have been used to maintain the system stability and help the lifting of the arm. In this work a multi-body simulation was performed with the software SimWise 4D by Design Simulation Technologies (DST). The simulation was used to determine the stiffness of the springs in the mechanism to provide assistance to raising of the patient’s arm. Furthermore, the software can provide a finite element analysis of the stress induced by the springs on the mechanism and the external load of the arm. Finally, a physical prototype of the mechanism was fabricated using PVC pipes and commercial metal springs. Due to the low cost of fabrication, simplicity, and ease of adjustability, it is believed that the GEAR has the potential to provide effective passive movement to individuals who otherwise would not have access to post-operative or post-stroke rehabilitation therapy.

Design Sensitivity Derivatives for Isoparametric Elements as an Integrated Part of Finite Element Analysis

1993 ◽  
Vol 115 (3) ◽  
pp. 671-674
Author(s):  
K. W. Zumwalt ◽  
M. E. M. El-Sayed
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Sensitivity ◽  
Test Cases ◽  
Element Analysis ◽  
Design Sensitivities ◽  
Sensitivity Derivatives ◽  
The Finite Element Analysis ◽  
Isoparametric Elements

This work presents an approach for incorporating design sensitivity calculations into the finite element analysis. The formulation depends on the implicit differentiation approach and requires few additional calculations to obtain the design sensitivity derivatives. The implicit differentiation approach is developed and implemented to calculate the design sensitivities for continuum and structural isoparametric elements. To demonstrate the developed approach test cases using different structural and continuum element types are presented.

Structural Assessment for Bogie Frame of 180km/h Korean Tilting Train

2005 ◽  
Vol 297-300 ◽  
pp. 345-350 ◽  
Author(s):  
Jung Seok Kim ◽  
Nam Po Kim
Keyword(s):  
High Speed ◽  
Load Condition ◽  
Structural Safety ◽  
Element Analysis ◽  
Bogie Frame ◽  
The Finite Element Analysis ◽  
Dynamic Analyses ◽  
Tilting Train ◽  
Multi Body ◽  
Body Dynamic

This paper has performed the fatigue strength evaluation for the bogie frame of Korean tilting train. In order to verify the structural safety of the bogie frame, we firstly investigated the loading condition imposed on the bogie frame. The bogie frame of the tilting train is exposed to the more severe loadings compared with the conventional one because of the tilting of the carbody and the high-speed curve negotiation. We have conducted some multi-body dynamic analyses to extract the load condition by tilting on curve. The finite element analysis is used to obtain the stress distribution. Through this study, we could make sure the safety of the tilting bogie frame.

A two degrees of freedom comb capacitive-type accelerometer with low cross-axis sensitivity

2019 ◽  
Vol 13 (3) ◽  
pp. 5334-5346
Author(s):  
M. N. Nguyen ◽  
L. Q. Nguyen ◽  
H. M. Chu ◽  
H. N. Vu
Keyword(s):  
Degrees Of Freedom ◽  
Proof Mass ◽  
Vibration Modes ◽  
Electrode Structure ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Fully Differential ◽  
Mode Effects ◽  
The Finite Element Analysis ◽  
Cross Axis

In this paper, we report on a SOI-based comb capacitive-type accelerometer that senses acceleration in two lateral directions. The structure of the accelerometer was designed using a proof mass connected by four folded-beam springs, which are compliant to inertial displacement causing by attached acceleration in the two lateral directions. At the same time, the folded-beam springs enabled to suppress cross-talk causing by mechanical coupling from parasitic vibration modes. The differential capacitor sense structure was employed to eliminate common mode effects. The design of gap between comb fingers was also analyzed to find an optimally sensing comb electrode structure. The design of the accelerometer was carried out using the finite element analysis. The fabrication of the device was based on SOI-micromachining. The characteristics of the accelerometer have been investigated by a fully differential capacitive bridge interface using a sub-fF switched-capacitor integrator circuit. The sensitivities of the accelerometer in the two lateral directions were determined to be 6 and 5.5 fF/g, respectively. The cross-axis sensitivities of the accelerometer were less than 5%, which shows that the accelerometer can be used for measuring precisely acceleration in the two lateral directions. The accelerometer operates linearly in the range of investigated acceleration from 0 to 4g. The proposed accelerometer is expected for low-g applications.

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