3 edition of Progress report for the research performed under NASA Research Grant NAG-1-643 found in the catalog.
Progress report for the research performed under NASA Research Grant NAG-1-643
1986 by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English
|Other titles||Design of anisotropic plates for improved damage tolerance.|
|Series||NASA contractor report -- NASA CR-180965.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
The cavitation index is dened according to the formula: 1 where: p p V the static pressure in the tunnel the critical vapour pressure the liquid density the ow velocity Tab. John Murray, London. However, the presence of the varying stiffness parameters dramatically increases the complexity of the analysis, therefore another goal of this research is to develop solutions that accurately model the physics of the problem while also being efficient numerically so that in-depth design and optimization studies can be conducted. Cohon, J. The complicated contradictory phenomena of concentration and dissipation of vorticity plays an important role in this process.
In the set of 15 non-dominated solutions obtained by using the results of three simulations, a distance of each of them from the asymptotic objective in normalized objective space, can be determined, Fig. For instance, Ashton3 was one of the first to present a general anisotropic plate analysis technique that allowed for the spatial variation of bending stiffness terms, and as an example suggested dropping plies to produce a tapered plate with variable stiffness coefficients. Multiple Single Objective Sampling. The results of calculations were compared with the collected experimental data. In order to provide sufcient number of microparticles in the ow, necessary for effective PIV measurements, the water in the tunnel was seeded with a silver metallic paint.
Third group of evaluation methods, completely different in conceptual respect, is the method of attainment function, Fig. In the paper an evolutionary algorithm where selection takes place based on the aggregated objective function combined with domination attributes as well as distance to the asymptotic solution, is proposed and applied to solve the problem of optimizing structural elements with respect to their weight and surface area for a high - speed vehicle-passenger catamaran structure, with taking into account several design variables such as plate thickness, scantlings of longitudinal stiffeners and transverse frames, and spacing between longitudinal and transversal members. It is very important to determine what kind of results will be subjected to measurement, evaluation and analysis, and to dene quality measures according to a task. The squealer tip has a groove cut on top of the blade which increases the area and stalls the flow thus creating back pressure and restricts leakage flow and reduces heat transfer. New York: Van Nostrand. Cours DEconomie Politique, Volume 1.
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In the case of single-objective optimization the selection of quality measure is obvious and simple: optimization criterion. For more complicated Progress report for the research performed under NASA Research Grant NAG-1-643 book, such as thin plates and shells that are subject to a greater variety of loading conditions, the possibility of an analogous design surely exists, though the optimal distribution of the stiffness may not be so apparent.
Elaborated quality measures may be applied only to specic aspects of the quality concept, therefore the only thing left to deduct is that the approximation a is not worse that the approximation B, which means that either the approximation a is better than the approximation B, or the approximations a and B are incomparable with regard to a specied quality measure.
Boomerang: catamaran ferry for Baltic Service, Additional methods to achieve spatial variations of the stiffness parameters using composite materials were also investigated, and subsequently new analysis techniques were formulated. The cavitation index is dened according to the formula: 1 where: p p V the static pressure in the tunnel the critical vapour pressure the liquid density the ow velocity Tab.
In the context of the presented work the question may be formulated as follows: how to compare effectiveness of the studied evolutionary multi-objective optimization of ship hull structure, assumed for different evaluation strategies of tness function.
The performed calculation investigations have positively veried the effectiveness of the combined tness multiobjective evolutionary algorithm developed by this author, as well as the calculation tool built for solving the unied ship structure topology-size multi-objective optimization problem.
One ow condition was selected for this comparison, namely hydrofoil angle of attack equal to 8 degrees and the velocity of ow equal to 5. Tesch, Ph. The benefits are attributed to the fact that higher temperature gases yield a higher energy potential. The geometry of the computation domain taken into account in the CFD calculation is shown in Fig.
Multiobjective Programming and Planning. Berlin-Heidelberg: Springer-Verlag.
Abraham, A. The HPT first stage blade is one component that is extremely vulnerable to the hot gas. These last two cases both involve some estimation of the Brazier effect, which is a nonlinear phenomena associated with bending of long tubes that can dramatically decrease the failure load of the cylinder.
Zitzler, E. In practical problems the ship structural multi-objective optimization which produces a set of Pareto-optimum solutions may be very computation time-consuming or even impossible to be performed.
The problem is extremely difcult also because in this case, as opposed to single-objective optimization, it is necessary to compare not individual solutions, but vectors representing sets of non-dominated solutions under assumption that they are an approximation of a practically unknown set of Pareto-optimum solutions, referred to as a front of Pareto-optimum solutions.
Marine Technology, 31 4 : Get this from a library! [Optimum design of geodesically stiffened composite plates]: progress report for the research performed under NASA research grant NAG [Zafer Gürdal; John L Phillips; United States.
National Aeronautics and Space Administration.]. The concept Structural design represents the subject, aboutness, idea or notion of resources found in Houston Public Library.
O Scribd é o maior site social de leitura e publicação do mundo.The concept Structural design represents the subject, aboutness, idea or notion of resources found in Houston Public Library.Progress report for the research performed under NASA Research Grant NAG by Zafer Gürdal.
[Washington, DC: Springfield, Va: National Aeronautics and Space Administration ; National Technical Information Service, distributor. MLA Citation. Gürdal, Zafer. and United States.
National Aeronautics and Space Administration.The concept Structural design represents the subject, aboutness, idea or notion of resources found in Houston Public Library.