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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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Proceedings ArticleDOI
08 Apr 2013
TL;DR: Numerical results show that the optimization approach is much efficient with little accuracy penalty and a practical optimum design of the composite wing structure in detailed FE model can be obtained.
Abstract: This paper presents a minimum weight optimization of a composite wing structure subject to multi constraints including strength, damage tolerance and aeroelastic stability. Based on preliminary design data, the investigation demonstrated an efficient optimization approach of a composite wing structure modeled by FEM in the detailed design phase for a flying wing aircraft. For potential application, the structure modeling and optimization process has been performed by full use of the commercial software MSC Nastran, which is widely employed in aerospace industry. First the wing structure FE model is divided into number of design zones along the span. A pre-process was proposed to group all plies in the same fiber orientation within one zone into a stack laminate and share one design variable. In each zone, the number of design variable in terms of skin ply thickness is reduced to the same number of fiber orientations used in the wing skin laminate. After the optimization, a post process was performed to trim the ply thickness and reset the skin laminate layup under the design and manufacture constraint. To keep the final design on the safe side, the thickness of an optimized ply is normally increased to the standard figure in the trim process. Consequently the trimmed structure weight is slightly increased after the post-process. However a practical optimum design of the composite wing structure in detailed FE model can be obtained. For the composite wing example, numerical results show that the optimized structure weight has been reduced by 16.3%. The results also show that the optimization approach is much efficient with little accuracy penalty.

7 citations

Journal ArticleDOI
TL;DR: An explicit upper bound upon W(j) as a function of n, d, and j is presented, which has general applicability to all linear codes.
Abstract: A linear code of block length n possessing minimum weight d has one code word of weight zero, and no other code words of weight less than d . The weight distribution of the code is given by the set of all W(j), d \leq j \leq n , describing the number of code words having a weight of exactly j . Exact weight distributions are known for only a handful of linear codes. This paper presents an explicit upper bound upon W(j) as a function of n, d , and j . The bound has general applicability to all linear codes.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis of anisotropic cylindrical shells of minimum weight is considered; the initial data relate to the characteristics of the reinforcing filaments and binder, the optimum case satisfying the requirements of stability, strength, and geometrical limitations is found by the method of projective gradients.
Abstract: The synthesis of anisotropic cylindrical shells of minimum weight is considered; the initial data relate to the characteristics of the reinforcing filaments and binder. The optimum case satisfying the requirements of stability, strength, and geometrical limitations is found by the method of projective gradients.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the augumented Lagrangian (ALAG) multiplier-based nonlinear programming technique is demonstrated for minimum weight design optimizations of boost and buck-boost power converters.
Abstract: The development of mathematical models suitable for minimum weight boost and buck-boost converter designs are presented. The facility of an augumented Lagrangian (ALAG) multiplier-based nonlinear programming technique is demonstrated for minimum weight design optimizations of boost and buck-boost power converters. ALAG-based computer simulation results for those two minimum weight designs are discussed. Certain important features of ALAG are presented in the framework of a comprehensive design example for boost and buck-boost power converter design optimization. The study provides refreshing design insight of power converters and presents such information as weight and loss profiles of various semiconductor components and magnetics as a function of the switching frequency.

7 citations

Journal ArticleDOI
TL;DR: In this article, the minimum weight design of an elastic pin-ended member of solid construction under prescribed bounds on the maximum permissible elongation under axial tension and on the minimum allowable Euler buckling load was provided.
Abstract: The paper provides the minimum-weight design of an elastic pin-ended member of solid construction under prescribed bounds on the maximum permissible elongation under axial tension and on the minimum allowable Euler buckling load. The member is to act as a tie for a part of its design life and as a column for the rest. Optimization for more than one design requirement not only unifies the design of mass-produced structural/mechanical elements, but also provides, at times, a practically acceptable design in that the optimal design does not have zero cross-sectional area at simply-supported ends—a situation quite common in optimal designs for a single requirement. However, it is shown that the constraints on longitudinal elongation and buckling load are less severe than that on the maximum stress. The effectiveness of optimization is judged by comparing the volume (mass) of the optimally designed member with that of a prismatic bar having the same buckling load.

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202239
202153
202051
201966
201858