CORSS: Cylinder Optimization of Rings, Skin, and Stringers
Author | : J. Finckenor |
Publisher | : |
Total Pages | : 96 |
Release | : 1994 |
Genre | : |
ISBN | : |
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Author | : J. Finckenor |
Publisher | : |
Total Pages | : 96 |
Release | : 1994 |
Genre | : |
ISBN | : |
Author | : J. Finckenor |
Publisher | : |
Total Pages | : 44 |
Release | : 1995 |
Genre | : Mathematical optimization |
ISBN | : |
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 40 |
Release | : 2018-07 |
Genre | : |
ISBN | : 9781722132903 |
Cylinder Optimization of Rings, Skin, and Stringers with Tolerance (CORSSTOL) sensitivity is a design optimization program incorporating a method to examine the effects of user-provided manufacturing tolerances on weight and failure. CORSSTOL gives designers a tool to determine tolerances based on need. This is a decisive way to choose the best design among several manufacturing methods with differing capabilities and costs. CORSSTOL initially optimizes a stringer-stiffened cylinder for weight without tolerances. The skin and stringer geometry are varied, subject to stress and buckling constraints. Then the same analysis and optimization routines are used to minimize the maximum material condition weight subject to the least favorable combination of tolerances. The adjusted optimum dimensions are provided with the weight and constraint sensitivities of each design variable. The designer can immediately identify critical tolerances. The safety of parts made out of tolerance can also be determined. During design and development of weight-critical systems, design/analysis tools that provide product-oriented results are of vital significance. The development of this program and methodology provides designers with an effective cost- and weight-saving design tool. The tolerance sensitivity method can be applied to any system defined by a set of deterministic equations. Finckenor, J. and Bevill, M. Marshall Space Flight Center ...
Author | : |
Publisher | : |
Total Pages | : 266 |
Release | : 1981 |
Genre | : Aircraft |
ISBN | : |
An analysis and an interactive computer program are described through which minimum weight designs of composite, stiffened, cylindrical panels can be obtained subject to general and local buckling constraints and stress and strain constraints. The panels are subjected to arbitrary combinations of in-plane axial, circumferential, and shear resultants. Nonlinear material effects are included if the material is isotropic or has stiffness in only one direction (as does a discrete or a smeared stiffener). Several types of general and local buckling modes are included as constraints in the optimization process, including general instability, panel instability with either stringers or rings smeared out, local skin buckling, local crippling of stiffener segments, and general, panel, and local skin buckling including the effects of stiffener rolling. Certain stiffener rolling modes in which the panel skin does not deform but the cross section of the stiffener does deform are also accounted for. The interactive PANDA system consists of three independently executed modules that share the same data base. In the first module an initial design concept with rough (not necessarily feasible or accurate) dimensions are provided by the user in a conversational mode. In the second module the user decides which of the design parameters of the concept are to be treated by PANDA as decision variables in the optimization phase. In the third module the optimization calculations are carried out. Many examples are provided in which optimum designs obtained by PANDA are compared to those in the literature. (Author).
Author | : |
Publisher | : |
Total Pages | : 548 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Author | : Louis Albert Scipio |
Publisher | : |
Total Pages | : 186 |
Release | : 1967 |
Genre | : Building materials |
ISBN | : |
Author | : A. Bruce Burns |
Publisher | : |
Total Pages | : 6 |
Release | : 1966 |
Genre | : |
ISBN | : |