Composite Design Methodology: Design of Composite Trails for the U.S. Army’s M198 Howitzer, A Case Study

1996 ◽  
Vol 118 (2) ◽  
pp. 286-293
Author(s):  
E. Sancaktar ◽  
M. West ◽  
K. R. Miner
Keyword(s):  
Finite Element ◽  
Design Methodology ◽  
Adhesive Bonding ◽  
Complex Loading ◽  
Material Design ◽  
Element Analysis ◽  
Finite Element Program ◽  
Analysis And Design ◽  
The U.S

Analysis and design of a fiber reinforced organic composite trail pair for the U.S. Army M198 Howitzer is presented as a case study in composite material design methodology. For this purpose mechanics analysis is performed using the computer program: MIC-MAC composites design and ANSYS 4.4A finite element analysis. The analyses includes composite lamination, material optimization, adhesive bonding, buckling, deflection, stress and failure analysis and validates the practicability of the proposed constant cross-section graphite/epoxy trail. The use of PC based spreadsheet MIC-MAC program, initially, allows efficient and inexpensive evaluation of several alternative designs including different geometries and materials before the finite element program is employed with the few final design choices to rule out failure in stress, deflection and buckling modes. However, superposition principles need to be used to describe the complex loading configuration as a collection of mechanically equivalent individual load modes such as midspan loaded beam, cantilever beam under torsion, in-plane loaded plate etc. in order to be able to utilize the MIC-MAC program initially. Fabrication plans are also proposed for the trail pair.

Finite-Element Analysis of Flexible Fixturing System

1987 ◽  
Vol 109 (2) ◽  
pp. 134-139 ◽  
Author(s):  
J. D. Lee ◽  
L. S. Haynes
Keyword(s):  
Finite Element ◽  
Computer Software ◽  
Elastic Solid ◽  
Element Analysis ◽  
Finite Element Program ◽  
Analysis And Design ◽  
Element Program ◽  
Applied Forces ◽  
Graphic Program ◽  
Computer Software System

A computer software has been developed for the analysis and design of fixtures. This software can lead the designer to the optimal design of the fixturing system which minimizes the total work done on the workpiece, the fixturing force, the deformation index, or the maximum effective stress. The workpiece is modeled as a linear isotropic elastic solid. The machining forces are simulated by specifying applied forces acting on part of the surface of the workpiece. The fixturing system consists of a number of fixture elements, each in contact with the workpiece with specified location and area of contact. At the interface of contact, Coulomb’s law of friction is employed. The boundary conditions at the interface of contact are treated exactly. This computer software system is composed of a finite-element program and a computer graphic program which displays the undeformed and deformed workpiece with hidden lines removed. Three sample problems have been solved and the numerical results are presented in this paper.

Framework for Computer Assisted Instruction Courseware: A Case Study

1986 ◽  
Vol 15 (1) ◽  
pp. 35-52
Author(s):  
Judith A. Betlach
Keyword(s):  
Design Methodology ◽  
Computer Assisted Instruction ◽  
Management Systems ◽  
Computer Assisted ◽  
Analysis And Design ◽  
User Community ◽  
Assisted Instruction ◽  
The U.S ◽  
Selection Of

This article systematically investigates, defines, and organizes variables related to production of Computer Assisted Instruction (CAI) courseware for the U.S. Army Logistics Management Systems Activity (ALMSA), St. Louis. Initial decisions regarding selection of analysis and design methodology, hardware, software and authoring languages were strongly influenced by availability within the ALMSA user community. Subsequent refinements may be required, but prototype boundaries have now been delineated for this prototype effort.

scholarly journals Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2760
Author(s):  
Ruiye Li ◽  
Peng Cheng ◽  
Hai Lan ◽  
Weili Li ◽  
David Gerada ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Design Methodology ◽  
Large Scale ◽  
Synchronous Generator ◽  
Axial Direction ◽  
Scale Model ◽  
Element Analysis ◽  
Axial Temperature ◽  
Ventilation Duct

Within large turboalternators, the excessive local temperatures and spatially distributed temperature differences can accelerate the deterioration of electrical insulation as well as lead to deformation of components, which may cause major machine malfunctions. In order to homogenise the stator axial temperature distribution whilst reducing the maximum stator temperature, this paper presents a novel non-uniform radial ventilation ducts design methodology. To reduce the huge computational costs resulting from the large-scale model, the stator is decomposed into several single ventilation duct subsystems (SVDSs) along the axial direction, with each SVDS connected in series with the medium of the air gap flow rate. The calculation of electromagnetic and thermal performances within SVDS are completed by finite element method (FEM) and computational fluid dynamics (CFD), respectively. To improve the optimization efficiency, the radial basis function neural network (RBFNN) model is employed to approximate the finite element analysis, while the novel isometric sampling method (ISM) is designed to trade off the cost and accuracy of the process. It is found that the proposed methodology can provide optimal design schemes of SVDS with uniform axial temperature distribution, and the needed computation cost is markedly reduced. Finally, results based on a 15 MW turboalternator show that the peak temperature can be reduced by 7.3 ∘C (6.4%). The proposed methodology can be applied for the design and optimisation of electromagnetic-thermal coupling of other electrical machines with long axial dimensions.

Finite Element Analysis on the Deformation of Energy-Saving Wire-Mesh Frame Wallboard

2014 ◽  
Vol 501-504 ◽  
pp. 731-735
Author(s):  
Li Zhang ◽  
Kang Li
Keyword(s):  
Finite Element ◽  
Energy Saving ◽  
Theoretical Basis ◽  
Steel Wire ◽  
Wire Mesh ◽  
Design Parameters ◽  
Element Analysis ◽  
Finite Element Program ◽  
Element Program ◽  
Influence Degree

This paper analyzes the influence degree of related design parameters of wire-mesh frame wallboard on deformation through finite element program, providing theoretical basis for the design and test of steel wire rack energy-saving wallboard.

scholarly journals Analysis of Non-Uniform Shrinkage Effect in Box Girder Sections for Long-Span Continuous Rigid Frame Bridge

2018 ◽  
Vol 13 (2) ◽  
pp. 146-155 ◽  
Author(s):  
Zhuoya Yuan ◽  
Pui-Lam Ng ◽  
Darius Bačinskas ◽  
Jinsheng Du
Keyword(s):  
Finite Element ◽  
General Purpose ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Program ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shrinkage Effect ◽  
Rigid Frame Bridge

To consider the effect of non-uniform shrinkage of box girder sections on the long-term deformations of continuous rigid frame bridges, and to improve the prediction accuracy of analysis in the design phase, this paper proposes a new simulation technique for use with general-purpose finite element program. The non-uniform shrinkage effect of the box girder is transformed to an equivalent temperature gradient and then applied as external load onto the beam elements in the finite element analysis. Comparative analysis of the difference in deflections between uniform shrinkage and nonuniform shrinkage of the main girder was made for a vehicular bridge in reality using the proposed technique. The results indicate that the maximum deflection of box girder under the action of non-uniform shrinkage is much greater than that under the action of uniform shrinkage. The maximum downward deflection of the bridge girder caused by uniform shrinkage is 5.6 mm at 20 years after completion of bridge deck construction, whereas the maximum downward deflection caused by non-uniform shrinkage is 21.6 mm, which is 3.8 times larger. This study shows that the non-uniform shrinkage effect of the girder sections has a significant impact on the long-term deflection of continuous rigid frame bridge, and it can be accurately simulated by the proposed transformation technique.

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