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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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TL;DR: In this paper, the minimum weight design of laminated fiber reinforced composite plate sub-fitted to inplane and transverse loading is attempted, where constraints on buckling load and transversal deflection are imposed.
Abstract: In this investigation, minimum weight d esign of laminated fiber reinforced composite plate sub- jected to inplane and transverse loading is attempted. Restrictions are imposed on buckling load and transverse deflection. Fiber orientation and thickness of each ply are t reated as design variables. Optimization studies a re carried out by using an unconstrained minimization technique. Numerical results have been obtained for anti- symmetric angle-ply l aminates treating number of plies as a parameter. Some of the observations are: (i) with preassigned fiber orientation, the optimum weight d esign results in a unique thickness distribution of plies; (ii) at low aspect ratios, stability constraint is active while deflection constraint is active at large aspect ratios.

6 citations

Journal ArticleDOI
TL;DR: In this paper, a sample steel industrial building is first analyzed and designed by using conventional steel hot rolled sections and then by using pre-engineered tapered and cold formed sections.
Abstract: In the past few decades most of the efforts were made to achieve minimum weight of the steel structures by satisfying all the design requirements imposed by various latest building codes and this idea lead towards the concept of pre-engineered steel buildings (PEB). In current research work, minimum weight buildings are targeted with simple fabrication process and easy erection to have maximum structural efficiency. Minimum weight of structure is proportional to the minimum cost and hence lowers seismic and gravitational forces. To achieve above mentioned objectives and to verify the suitability and applicability of concept of PEB, a sample steel industrial building is first analyzed and designed by using conventional steel hot rolled sections and then by using pre-engineered tapered and cold formed sections. Results of analysis were compared in terms of weight and response of structures which clearly indicated that PEB structures are of less weight and structurally more efficient than conventional steel structures.

6 citations

Journal ArticleDOI
TL;DR: An efficient scheme ZSSMP (Zimmermann Special Stabilizer Multiplier Permutation) to find the true value of the minimum distance for many large BCH codes is presented and its quality for attacking the hardness of minimum weight search problem is proved.
Abstract: BCH codes represent an important class of cyclic error-correcting codes; their minimum distances are known only for some cases and remains an open NP-Hard problem in coding theory especially for large lengths. This paper presents an efficient scheme ZSSMP (Zimmermann Special Stabilizer Multiplier Permutation) to find the true value of the minimum distance for many large BCH codes. The proposed method consists in searching a codeword having the minimum weight by Zimmermann algorithm in the sub codes fixed by special stabilizer multiplier permutations. These few sub codes had very small dimensions compared to the dimension of the considered code itself and therefore the search of a codeword of global minimum weight is simplified in terms of run time complexity. ZSSMP is validated on all BCH codes of length 255 for which it gives the exact value of the minimum distance. For BCH codes of length 511, the proposed technique passes considerably the famous known powerful scheme of Canteaut and Chabaud used to attack the public-key cryptosystems based on codes. ZSSMP is very rapid and allows catching the smallest weight codewords in few seconds. By exploiting the efficiency and the quickness of ZSSMP, the true minimum distances and consequently the error correcting capability of all the set of 165 BCH codes of length up to 1023 are determined except the two cases of the BCH(511,148) and BCH(511,259) codes. The comparison of ZSSMP with other powerful methods proves its quality for attacking the hardness of minimum weight search problem at least for the codes studied in this paper.

6 citations

Journal ArticleDOI
TL;DR: In this paper, a polyethylene moderated neutron detector was designed in order to have the optimum combination of maximum counting efficiency and minimum weight, which was then fabricated and experimentally tested against another system, which is currently employed in the INF treaty between Russia and the United States.
Abstract: This paper describes a technique in which a polyethylene moderated neutron detector was designed in order to have the optimum combination of maximum counting efficiency and minimum weight. Such a detector would be of use in arms control, counter proliferation or treaty verification applications, in which measurement time and system portability are important considerations. In such applications, the neutron source may be a spontaneous fissioning isotope such as Pu 240 . After consideration of many different neutron detection schemes, the paper concludes that the best detection scheme for this problem would be a system which utilizes He 3 gas filled detectors surrounded by a moderator material. The “moderator weight efficiency” concept was developed as the basis for comparisons of different moderators and geometries. The MCNP neutron transport code was then used to evaluate moderator efficiencies for these different systems. The moderators considered by the paper included light water, heavy water, graphite, and polyethylene. The moderator geometries considered were a variety of shapes between (and including) planar and cylindrical. The paper describes an optimized system, which was found to have a combination of maximum performance and minimum moderator and system weight. The optimized detector was then fabricated and experimentally tested against another system, one which is currently employed in the INF treaty between Russia and the United States. Results are presented which show that the “optimized” system has higher counts per unit moderator (and system) weight than the INF comparison system.

6 citations

Journal ArticleDOI
TL;DR: In this paper, a procedure for the minimum weight design of helicopter rotor blades with constraints on multiple coupled flap-lag natural frequencies, autorotational inertia, and centrifugal stress is presented.
Abstract: A procedure for the minimum weight design of helicopter rotor blades with constraints on multiple coupled flap-lag natural frequencies, autorotational inertia, and centrifugal stress is presented. Optimum designs are obtained for blades with both rectangular and tapered planforms and are compared within a reference blade. The effects of higher-frequency constraints and stress constraints on the optimum blade designs are assessed. The results indicate that there is an increase in blade weight and a significant change in the design variable distributions with an increase in the number of frequency constraints. The inclusion of stress constraints has different effects on the wall thickness distributions of rectangular and tapered blades, but tends to increase the magnitude of the nonstructural segment weight distributions for both blade types.

6 citations


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