Topic
Minimum weight
About: Minimum weight is a research topic. Over the lifetime, 2002 publications have been published within this topic receiving 28244 citations.
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TL;DR: In this article, a GA was used to maximize sound transmission loss (TL) across a functionally graded material (FGM) cylindrical shell, where the objective function was modified based on the first resonant frequency.
Abstract: The maximizing of sound transmission loss (TL) across a functionally graded material (FGM) cylindrical shell has been conducted using a genetic algorithm (GA). To prevent the softening effect from occurring due to optimization, the objective function is modified based on the first resonant frequency. Optimization is performed over the frequency range 1000–4000 Hz, where the ear is the most sensitive. The weighting constants are chosen here to correspond to an A-weighting scale. Since the weight of the shell structure is an important concern in most applications, the weight of the optimized structure is constrained. Several traditional materials are used and the result shows that optimized shells with aluminum-nickel and aluminum-steel FGM are the most effective at maximizing TL at both stiffness and mass control region, while they have minimum weight.
10 citations
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01 Jan 1987TL;DR: In this paper, a multilevel optimization procedure for minimum weight design of composite structures is presented, where the optimization process is divided into two levels: system level and component level.
Abstract: We present a multilevel optimization procedure for minimum weight design of composite structures. The optimization process is divided into two levels: system level and component level. In system level the thicknesses of laminated composite plates represent the design variables. The well-known optimality criterion method based on the Kuhn-Tucker condition is used to modify the design variables. The detail design of laminated plates, i.e. to determine the optimal ply thicknesses, is handled in component level In component level, keeping the thickness of laminated composite plates and the nodal displacements invariant, the ply thicknesses are adjusted according to the strain energy possessed by each ply. As an illustrative example, a cantilever composite beam, which is subjected to several load conditions and multiple constraints, is studied. All the five examples given in this chapter present very satisfactory results. In general the optimal design can be obtained after 3–5 iterations.
10 citations
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07 May 2012TL;DR: In this paper, it is suggested to use multi-layer graphs as a mathematical model in the design of MPLS networks and the application of this model makes it possible to design multi-service telecommunication systems simultaneously at several levels and to reduce the problem to the search of the minimum weight graph.
Abstract: It is suggested to use multi-layer graphs as a mathematical model in the design of MPLS networks. The application of this model makes it possible to design multi-service telecommunication systems simultaneously at several levels and to reduce the problem to the search of the minimum weight graph.
10 citations
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TL;DR: In this article, a procedure including highly automated computer programs for the optimum weight design of fuselage type stiffened cylinders subjected to combined torsion and axial compression with and without lateral pressure is developed.
10 citations