An empirically based computer-aided design procedure for closed die forgings

1987 ◽  
Vol 4 (4) ◽  
pp. 306-316 ◽  
Author(s):  
A. Raikar ◽  
I. Haque ◽  
J. Jackson
Keyword(s):  
Computer Aided Design ◽  
Design Procedure ◽  
Computer Aided ◽  
Aided Design

A Computational Geometry for the Blades and Internal Flow Channels of Centrifugal Compressors

1983 ◽  
Vol 105 (2) ◽  
pp. 288-295 ◽  
Author(s):  
M. V. Casey
Keyword(s):  
Computational Geometry ◽  
Computer Aided Design ◽  
Design Procedure ◽  
Internal Flow ◽  
Geometrical Shape ◽  
Parametric Form ◽  
Centrifugal Compressors ◽  
Flow Channels ◽  
Computer Aided ◽  
Aided Design

A new computational geometry for the blades and flow passages of centrifugal compressors is described and examples of its use in the design of industrial compressors are given. The method makes use of Bernstein-Bezier polynomial patches to define the geometrical shape of the flow channels. This has the following main advantages: the surfaces are defined by analytic functions which allow systematic and controlled variation of the shape and give continuous derivatives up to any required order: and the parametric form of the equations allows the blade and channel coordinates to be very simply obtained at any number of points and in any suitable distribution for use in subsequent aerodynamic and stress calculations and for manufacture. The method is particularly suitable for incorporation into a computer-aided design procedure.

Computer Aided Design of Mixed Flow Turbines for Turbochargers

1979 ◽  
Vol 101 (3) ◽  
pp. 440-448 ◽  
Author(s):  
N. C. Baines ◽  
F. J. Wallace ◽  
A. Whitfield
Keyword(s):  
Mass Flow ◽  
Computer Aided Design ◽  
High Speed ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Design Procedure ◽  
Mixed Flow ◽  
Computer Aided ◽  
Design Calculations ◽  
Aided Design

The paper describes a comprehensive computer aided design procedure and its use to investigate mixed flow turbines for automotive turbocharger applications. The outside dimensions of rotor and casing as well as blade angles are determined from one-dimensional design and off design calculations, the detailed blade shape from quasi-three-dimensional analysis and mechanical stressing and vibration programs, and geometric data are presented as outside views and sections of the rotor by a graphics subroutine. The procedure consists of a series of separate programs rather than a single program, so that the designer’s intervention at each stage of the process can be applied. Two mixed flow rotors were designed, manufactured and tested in a specially designed high speed dynamometer. The first was intended to achieve a substantial increase in mass flow over the reference radial rotor without loss of efficiency, while the latter was intended as a direct replacement of the reference radial rotor, but should give more favorable pulse performance when operating in conjunction with an engine due to changes in the operating map viz: a) lower tip speeds for best efficiency, and b) flatter mass flow characteristics. Both effects were predicted by analysis and confirmed by tests.

Decorative Means in Forming Crystal Domes and Shells

1993 ◽  
Vol 8 (4) ◽  
pp. 251-259
Author(s):  
N.A. Gogoleva
Keyword(s):  
Conceptual Design ◽  
Computer Aided Design ◽  
Design Procedure ◽  
Shell Structures ◽  
Geometrical Modelling ◽  
Shape Formation ◽  
Decorative Element ◽  
Computer Aided ◽  
Multiple Alternative ◽  
Aided Design

This paper discusses the conceptual design of decorative crystalline domed structures. The application of the structure itself as a decorative element in combination with three ways of shape-forming: spatial, structural and geometrical, is a feature of such composite shape formation of crystalline domed shells. The author developed a computer-aided design procedure for decorative means of forming crystalline dome-and-shell structures. The procedure can be applied to preliminary multiple-alternative geometrical modelling of ornamental-decorative constructural forming of networks as well as designing the decorative finish to domed shell surfaces.

A Human Factors Design Investigation of a Computerized Layout System of Text-Graphic Technical Materials

1988 ◽  
Vol 30 (3) ◽  
pp. 347-358 ◽  
Author(s):  
Cheickna Sylla ◽  
Colin G. Drury ◽  
A. J. G. Babu
Keyword(s):  
Human Factors ◽  
Computer Aided Design ◽  
Design Procedure ◽  
Questionnaire Study ◽  
Page Layout ◽  
Job Aids ◽  
Computer Aided ◽  
Design Algorithms ◽  
Aided Design

In converting task listings into multiple pages of documentation for job aids or training, the two major problems are deciding how much material should go on each page and how text and graphics should be laid out on the page. A questionnaire study was used to collect input from 14 human factors personnel in order to design algorithms for page splitting and page layout. From the rules or heuristics used for page splitting, an algorithm was devised that closely matched human page-splitting results. Layout of individual pages was automated with an algorithm based on the (significant) consensus among the subjects on questions of graphics positioning and label ordering. The two algorithms have been combined in a computer-aided design procedure that automatically pages task lists and lays out individual pages.

A Computational Geometry for the Blades and Internal Flow Channels of Centrifugal Compressors

1982 ◽  
Author(s):  
M. V. Casey
Keyword(s):  
Computational Geometry ◽  
Computer Aided Design ◽  
Design Procedure ◽  
Internal Flow ◽  
Geometrical Shape ◽  
Parametric Form ◽  
Centrifugal Compressors ◽  
Flow Channels ◽  
Computer Aided ◽  
Aided Design

A new computational geometry for the blades and internal flow passages of centrifugal compressors is described and examples of its use in the design of industrial compressors are given. The method makes use of Bernstein-Bezier polynomial patches to define the geometrical shape of the flow channels. This has the following main advantages: the surfaces are defined by analytic functions which allow systematic and controlled variation of the shape and give continuous derivatives up to any required order; and the parametric form of the equations allows the blade and channel coordinates to be very simply obtained at any number of points and in any suitable distribution for use in subsequent aerodynamic and stress calculations and for manufacture. The method is particularly suitable for incorporation into a computer aided design procedure.

Computer Aided Design of Rotary Screen and its Conveyor for Solid Waste Processing Systems

1997 ◽  
Author(s):  
Bilgin Kaftanoglu ◽  
Okan Alkan
Keyword(s):  
Computer Program ◽  
Simulation Model ◽  
Solid Waste ◽  
Computer Aided Design ◽  
Design Procedure ◽  
Waste Processing ◽  
Computer Aided ◽  
Aided Design ◽  
Program Data ◽  
System Characteristics

Abstract In this study, typical solid waste processing systems are analyzed. Then, a rotary screen and conveyor is designed for composting plants. A computer program is developed for the design procedure. By use of a simulation model included in the program, data are obtained and these are plotted to see system characteristics. These data then, are compared with the previous works.

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