Topic
Minimum weight
About: Minimum weight is a research topic. Over the lifetime, 2002 publications have been published within this topic receiving 28244 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the out-of-plane shear behavior of a hollow core is analyzed and the expressions for the failure loads are developed, and a strength-based optimisation problem is formulated for predicting the optimum values of the panel dimensions that would produce minimum panel weight when subjected to bending.
26 citations
TL;DR: In this paper, a finite element analysis of composite pressure vessel is performed by using commercial finite element code ANSYS and utilizing the capabilities of ANsYS Parametric Design Language and Design Optimization module to automate the process of optimization.
Abstract: The use of composite pressure vessels particularly in the aerospace industry is escalating rapidly because of their superiority in directional strength and colossal weight advantage The present work elucidates the procedure to optimize the lay-up for composite pressure vessel using finite element analysis and calculate the relative weight saving compared with the reference metallic pressure vessel The determination of proper fiber orientation and laminate thickness is very important to decrease manufacturing difficulties and increase structural efficiency In the present work different lay-up sequences for laminates including, cross-ply [0
m
/90
n
]
s
, angle-ply [±θ]
ns
, [90/±θ]
ns
and [0/±θ]
ns
, are analyzed The lay-up sequence, orientation and laminate thickness (number of layers) are optimized for three candidate composite materials S-glass/epoxy, Kevlar/epoxy and Carbon/epoxy Finite element analysis of composite pressure vessel is performed by using commercial finite element code ANSYS and utilizing the capabilities of ANSYS Parametric Design Language and Design Optimization module to automate the process of optimization For verification, a code is developed in MATLAB based on classical lamination theory; incorporating Tsai–Wu failure criterion for first-ply failure (FPF) The results of the MATLAB code shows its effectiveness in theoretical prediction of first-ply failure strengths of laminated composite pressure vessels and close agreement with the FEA results The optimization results shows that for all the composite material systems considered, the angle-ply [±θ]
ns
is the optimum lay-up For given fixed ply thickness the total thickness of laminate is obtained resulting in factor of safety slightly higher than two Both Carbon/epoxy and Kevlar/Epoxy resulted in approximately same laminate thickness and considerable percentage of weight saving, but S-glass/epoxy resulted in weight increment
26 citations
TL;DR: In this article, the substitute problem of fully stressed design or simultaneous failure modes design is often solved in place of the minimum weight design, and the equivalence of these two solutions can be demonstrated for a large class of discrete and continuous structures subjected to a single load condition.
Abstract: The substitute problem of fully stressed design or simultaneous failure modes design is often solved in place of the minimum weight design. A method is presented which can be used to determine the validity of the substitute problem of fully stressed or simultaneous failure modes design. The equivalence of these two solutions can be demonstrated for a large class of discrete and continuous structures subjected to a single load condition. This equivalence can also be extended to a stress limited determinate truss subjected to several independent mechanical loads. However, it can also be shown that the simultaneous failure modes is not necessarily the minimum weight design for waffle plates subjected to a multiplicity of biaxial loads.
26 citations
Journal Article•
TL;DR: This paper compares the effect of using different topologies or connections between separate colonies in island based parallel implementations of the Ant Colony Optimization applied to the Minimum Weight Vertex Cover Problem and proposes a variation of the algorithm corresponding to the ring topology that maintains the diversity of the search, but still moves to areas with better solutions and gives slightly better results even on a single processor with threads.
Abstract: The aim of this paper is compare the effect of using different topologies or connections between separate colonies in island based parallel implementations of the Ant Colony Optimization applied to the Minimum Weight Vertex Cover Problem. We investigated the sequential Ant Colony Optimization algorithms applied to the Minimum Weight Vertex Cover Problem before. Parallelization of population based algorithms using the island model is of great importance because it often gives super linear increase in performance. We observe the behavior of different parallel algorithms corresponding to several topologies and communication rules like fully connected, replace worst, ring and independent parallel runs. We also propose a variation of the algorithm corresponding to the ring topology that maintains the diversity of the search, but still moves to areas with better solutions and gives slightly better results even on a single processor with threads.
26 citations
TL;DR: In this article, a new type of sandwich panels with prismatic cores, which are capable of load bearing as well as cooling, is optimized to have minimum weight and maximum heat transfer performance.
26 citations