 |
|
|
EI上检索到膜结构方面的资料，希望能获得这些文章的热心人帮忙上传
DIALOG No: 05267698 EI Monthly No: EIP99044631737
Title: Cutting pattern generation for tent type structures represented by minimum surfaces
Author: Popov, V.
Corporate Source: SeaTech Ltd, Nizny Novgorod, Russia
Source: Transactions of the Canadian Society for Mechanical Engineering v 22 n 4A 1998. p 369-377
Publication Year: 1998
CODEN: TCMEAP ISSN: 0315-8977
Language: English
Document Type: JA;(Journal Article) Treatment Code: T;(Theoretical)
Abstract: The paper is a sequel in a set of papers dealing with the development of the Stretched Grid Method (SGM) to minimize surfaces and other related problems.Now we focus on the generation of the cutting patterns for fabric structures with predetermined forms. Based on equi-areal of surface mapping onto the plane area the basic condition results in a formulation of a system of non-linear equations.The simple iteration procedure for cutting patterns generated is used and explained. The efficiency of the approach is demonstrated with examples of surfaces with single and double-curvature that can be simply unfolded or flattened.(Author abstract) 5 Refs.
Descriptors: *Fabrics;Nonlinear equations;Mathematical models;Iterative methods
Identifiers: Cutting patterns; Stretched grid method (SGM);Surface mapping
819.4 (Fiber Products);921.6 (Numerical Methods)
819 (Textile [$ Fiber Technology)]921 (Applied Mathematics)
End of record 1
DIALOG No: 06116482 EI Monthly No: EIP02357062842
Title: Computer aided texture alignment of Japanese kimono
Author: Sano, Tetsuya;Yamamoto, Hideki
Corporate Source: Faculty of Education Okayama University, Okayama, 700-8530, Japan
Conference Title: 19th IEEE Instrumentation and Measurement Technology Conference
Conference Location: Anchorage, AK, United States Conference Date: 20020521-20020523
Conference Sponsor: IEEE
Source: Conference Record - IEEE Instrumentation and Measurement Technology Conference v 1 2002. p 491-496 (IEEE cat n 00ch37276)
Publication Year: 2002
CODEN: CRIIE7
Language: English
Conference Number: 59419
Document Type: CA;(Conference Article) Treatment Code: T;(Theoretical)
Abstract: A yukata is a type of traditional Japanese clothing.An alignment of its texture pattern is an important factor of the yukata design. In the traditional design of the yukata, the calculation of the size, texture alignment and the development of the cutting pattern are manually performed. There are traditional rules for the texture alignment.Especially, the texture alignment depends on the experience and intuition of the skilled person.We have developed a CAD system for Japanese kimono.In this paper, we describe about methods for automatic texture alignment.At first, image processing algorithms to detect the texture pattern in the kimono cloth are developed. Secondarily, methods of the texture alignment based on the traditional rules are developed.Finally, image processing algorithms for the texture alignment based on the traditional rules are proposed.By using this CAD system, designers can easily tailor the yukata regardless of their skill.7 Refs.
Descriptors: *Computer aided design;Textures;Pattern recognition; Algorithms;Computer simulation
Identifiers: Japanese kimono;Computer aided texture alignment;Yukata
723.5 (Computer Applications);933.1 (Crystalline Solids)
723 (Computer Software, Data Handling [$ Applications)]933 (Solid State Physics)
End of record 1
DIALOG No: 06024967 EI Monthly No: EIP02116889229
Title: An algorithm for the determination of optimal cutting patterns
Author: Schilling, Gordian;Georgiadis, Michael C.
Corporate Source: Centre for Res. and Tech - Hellas Chemical Process Eng. Res. Inst., Thessaloniki, Thermi 57001, Greece
Source: Computers and Operations Research v 29 n 8 July. p 1041-1058
Publication Year: 2002
CODEN: CMORAP ISSN: 0305-0548
Language: English
Document Type: JA;(Journal Article) Treatment Code: T;(Theoretical)
Abstract: This paper presents a new mathematical programming formulation for the problem of determining the optimal manner in which several product rolls of given sizes are to be cut out of raw rolls of one or more standard types.The objective is to be perform this task so as to maximize the profit talking account of the revenue from the sales, the costs of the original rolls, the costs of changing the cutting pattern and the costs of disposal of the trim. A mixed integer linear programming (MILP) model is proposed which is solved to global optimality using standard techniques.A number of example problems, including an industrial case study, are presented to illustrate the efficiency and applicability of the proposed model. One-dimensional cutting stock (trim loss) problems arise when production items must be physically divided into pieces with a diversity of sizes in one dimension (e.g. when slitting master rolls of paper into narrower width rolls). Such problems occur when there are no economies of scale associated with the production of the larger raw (master) rolls.In general, the objectives in solving such problems are to [5] : circle closed minimize trim loss; circle closed avoid production over-runs and/or; circle closed avoid unnecessary slitter setups.The above problems is particularly important in the paper converting industry when a set of paper rolls need to be cut from raw paper rolls.Since the width of a product is fully independent of the width of the raw paper a highly combinatorial proble arises.In general, the cutting process always produces inevitable trim-loss which has to be burned or processed in some waste treatment plant. Trim-loss problems in the paper industry have, in recent years, mainly been solved using heuristic rules.The practical problem formulation has, therefore, in most cases been restricted by the fact that the solution methods ought to be able to handle the entire problem.Consequently, only a suboptimal solution to the original problem has been obtained and very often this rather significant economic problenm has been left to a manual stage.This work presents a novel algorithm for efficiently determining optimal cutting patterns in the paper converting process. A mixed-integer linear programming model is proposed which is solved to global optimally using available computer tools.A number of example problems including an industrial case study are presented to illustrate the applicability of the proposed algorithm. copy 2002 Elsevier Science Ltd.All rights reserved.15 Refs.
Descriptors: *Linear programming;Operations research;Paper and pulp industry;Combinatorial mathematics;Algorithms
Identifiers: Mixed integer linear programming (MILP)
811.0.3 (Economics, Research [$ Miscellaneous)]811.1.2 (Papermaking Equipment)
921.5 (Optimization Techniques);912.3 (Operations Research);811.1 (Pulp [$ Paper)]921.4 (Combinatorial Mathematics, Includes Graph Theory, Set Theory);811.0 (General Topics in Paper Science & Technology)
921 (Applied Mathematics);912 (Industrial Engineering [$ Management)]811 (Cellulose, Paper & Wood Products)
End of record 2
DIALOG No: 05761208 EI Monthly No: EIP01015478008
Title: Computer cutting pattern generation of membrane structures
Author: Xia, Xiaoyan;Meek, John L.
Corporate Source: Univ of Queensland, Brisbane, Australia
Source: International Journal of Space Structures v 15 n 2 2000. p 95-110
Publication Year: 2000
CODEN: ISSTER ISSN: 0266-3511
Language: English
Document Type: JA;(Journal Article) Treatment Code: A;(Applications);T;(Theoretical)
Abstract: This paper sets out a simple design procedure for generating the cutting patterns of a membrane surface which can then be used for a variety of purposes, including fabric of tension surface. It does this by pre-defining the requirements of the cutting pattern which is set out by the designer on an initially flat surface. A cable net is used for the approximating surface and the cables approximate the warp and weft directions of the fabric (see our previous paper on shape generation).The present work designs the procedure and gives examples of results of the shape finding of a surface with a number of different cutting patterns. An example of a compression membrane surface is also given.(Author abstract) 21 Refs.
Descriptors: *Fabrics;Computer aided design;Cutting; Computer simulation;Computational geometry;Computer graphics;Numerical methods
Identifiers: Computer cutting pattern generation; Membrane structures;Cable net
819.4 (Fiber Products);723.5 (Computer Applications);921.6 (Numerical Methods)
819 (Textile [$ Fiber Technology)]723 (Computer Software);921 (Applied Mathematics)
End of record 6
DIALOG No: 04854881 EI Monthly No: EIP97103898612
Title: Textile structures: A comparison of several cutting pattern methods
Author: Galasko, G.;Leon, J.C.;Trompette, R.;Veron, P.
Corporate Source: Technical Univ of Budapest, Budapest, Hung
Source: International Journal of Space Structures v 12 n 1 1997. p 9-18
Publication Year: 1997
CODEN: ISSTER ISSN: 0266-3511
Language: English
Document Type: JA;(Journal Article) Treatment Code: T;(Theoretical)
Abstract: The performances of three cutting pattern methods are compared by means of two specific and quite different examples: a hyperbolic paraboloid and a pan of a sixteenth of a sphere. It is shown that the results obtained are significantly different, something which can explain the difficulties sometimes encountered during the practical erection of tensile structures despite a convenient shape definition.(Author abstract) 11 Refs.
Descriptors: *Structural analysis;Textiles;Tensile strength
Identifiers: Cutting pattern methods; Textile structures
408.1 (Structural Design, General)
408 (Structural Design);819 (Textile & Fiber Technology)
End of record 1
DIALOG No: 05689737 EI Monthly No: EIP00105367449
Title: Static and dynamic analysis of partially wrinkled membrane structures
Author: Adler, Aaron L.;Mikulas, Martin M.;Hedgepeth, John M.
Corporate Source: Univ of Colorado, Boulder, CO, USA
Conference Title: 41st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and ExhibitAIAA/ASME/AHS Adaptive Structures ForumAIAA Non-Deterministic Approaches ForumAIAA Space Inflatables Forum
Conference Location: Atlanta, GA, USA Conference Date: 19000403-19000406
Source: Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference v 4 2000. AIAA, Reston, VA, USA. p 158-171 AIAA-2000-1810
Publication Year: 2000
CODEN: CPSCDO ISSN: 0273-4508
Language: English
Conference Number: 57446
Document Type: CA;(Conference Article) Treatment Code: T;(Theoretical);X;(Experimental)
Abstract: With the number of space vehicle designs considering tensioned membrane structures (like the NGST sunshield and some Space Based Radar systems) increasing, understanding of their behavior is becoming necessary. Solving tensioned membrane problems using current standard commercial finite element codes, such as NASTRAN, is difficult or impossible when structural wrinkles form. This proposal discusses the development of modeling techniques for static and dynamic analysis of partially wrinkled membrane structures. The research uses two finite element approaches to model and simulate the effects of structural wrinkles in a membrane structure. Both experimental and finite element studies are currently under way with several example problems being studied.(Author abstract)
Descriptors: *Structural analysis;Problem solving;Finite element method;Computer simulation;Deformation;Mathematical models
Identifiers: Wrinkled membrane structures
408.1 (Structural Design, General);921.6 (Numerical Methods);723.5 (Computer Applications)
408 (Structural Design);921 (Applied Mathematics);723 (Computer Software)
End of record 6
DIALOG No: 05512262 EI Monthly No: EIP00035102339
Title: Shape-stress trade-off design of membrane structures for specified sequence of boundary shapes
Author: Ohsaki, M.;Uetani, K.
Corporate Source: Kyoto Univ, Kyoto, Jpn
Source: Computer Methods in Applied Mechanics and Engineering v 182 n 1-2 Feb 4 2000. p 73-88
Publication Year: 2000
CODEN: CMMECC ISSN: 0045-7825
Language: English
Document Type: JA;(Journal Article) Treatment Code: A;(Applications);T;(Theoretical)
Abstract: A new method is presented for parametrically generating optimal shapes and stresses of a membrane structure supported by a frame. The problem considered here is a so called trade-off design problem where the weighted sum of the deviations of the initial stress and the shape from the desired distribution is to be minimized.The membrane is discretized by using the finite element method, and optimal shapes are expanded with respect to a parameter defining the shape of the boundary frame. An approximate method is presented without exact calculation of the Hessian of the stresses with respect to the nodal coordinates.The explicit developability conditions derived by the authors are used to guarantee the curved surface to be reduced to a set of plane cutting patterns after removing the pretensioning force.In the examples, trade-off designs are found for an HP-type membrane structure and the efficiency of the proposed method is discussed. (Author abstract) 24 Refs.
Descriptors: *Finite element method;Approximation theory;Stress analysis;Deformation;Nonlinear equations;Strain;Stress relaxation;Mathematical programming;Optimization;Boundary conditions
Identifiers: Pretensioning;Homotopy method
921.6 (Numerical Methods);931.1 (Mechanics);921.2 (Calculus);921.5 (Optimization Techniques)
921 (Applied Mathematics);931 (Applied Physics)
End of record 30
还有
[58] H.J.Scheck．The force density method for form finding and computation of general networks．Computer Method in Applied Mechanics and Engineering. Vol.3, pp.115-134
[59] M.R.Barnes．Formfinding and analysis of prestressed net and membranes．Computer & Structures, Vol.30, No.3, 1988
[60] M.R. Barnes. Formfinding and analysis of tension structures by dynamic relaxation. Int. J. of Space Structure. Vol. 14(2), 1999
[61] Bletzinger etal. General finite element approach to the form finding of tensile structures by the updated reference strategy. Int. J. of Space Structure. Vol. 14(2), 1999
[62] Ishii Kazuo Form finding analysis in consideration of cutting patterns of membrane structures. Int. J. of Space Structure. Vol. 14(2), 1999
[63] Meek, John L. etal. Computer shape finding of form structures. Int. J. of Space Structure. Vol. 14(2), 1999
[64]Lewis. W. J., Lewis. T. S. Application of Formian and dynamic relaxation to the form finding of miminal surfaces. J of IASS, Vol.37(122), 1996
[65] Gosling, P.D, Lewis, W. S. Optional structural membrane-2: Form-finding of prestressed membrane using a curved quadrilateral finite element for surface definition. Computer & Structure. Vol. 61(5), 1996
[66] C.J.K. Williams. The use of modified Bezier Triangles for the form finding and analysis of cable net structures. Structural Engineering Review, Vol.6(3-4), 1994
[67] L.Grundig．Minimal surface finding forms of structural membranes. Computer & Structures, Vol.30, No.3, 1988
[68] K. Linkwitz etal. Optimizing the shape of the roof of the Olympic Stadium, Montreal. Structural Engineering Review, 1998,1, 225-232
[69] K. Linkwitz. About formfinding of double-curved structures. Engineering Structures. Vol.21, 1999
[70] Wu.B., Du.X., Tan.H. Three-dimensional nonlinear analysis of membranes. Computer & Structures, 1996, Vol.59, No.4, pp.601-605
[71]B. Foster. Cable and membrane roofs ― a historical survey. Structural Eng. Review. Vol. 6(3-4), 1994
[72] R. B. Haber etal. An integrated design system for cable reinforced membranes using interactive computer graphics. Computer & Structures. Vol. 14(3-4), 1981
[73] B.T. Davis. Primary supports:Masts, arches,anchorages.
[74] Barnes, Wakefield. Formfinding, analysis and patterning of surface-stressed structures.
[75] E. Haug. Numerical design of membranes.
[76] Vinzenz Sedlak. Aspects of detailing and component selection in memebrane structures.
[77] John.F. Howell. Physical modeling for loading and performance evaluation of membrane structures.
[78] Peter Kneen. Shape determination and analysis
|
