scholarly journals Toward Modeling the Concurrent Design of Aircraft Engine Turbines

Author(s):  
Hauhua Lee ◽  
Sanjay Goel ◽  
Siu S. Tong ◽  
Brent Gregory ◽  
Scott Hunter

This paper describes our approach and experiences in constructing the Turbine Auto–Designer (TAD), an automated concurrent design system for aircraft engine turbines. In TAD, the design process is modeled based on the computer programs of a representative design system. It integrates three domains of the manual design process: preliminary design, detailed aerodynamic design, and detailed mechanical design. The manual design of turbines is an iterative redesign process involving the use of many sets of Computer Aided–Engineering (CAE) programs. The entire design process is modeled at four levels: analysis, automation, optimization, and concurrency. TAD is implemented with Engineous, a generic software shell for engineering design. Parts of TAD are already in use in day–to–day design practice for low–pressure turbines. In many cases of preliminary design, TAD can obtain better results quicker than the optimum obtained manually. Results also show that, for detailed aerodynamic analysis, the system can reduce the cycle time from days to hours.

Author(s):  
Zhiqiang Chen ◽  
Zahed Siddique

The emergence of computer and network technology has provided opportunities for researchers to construct and build systems to support dynamic, real-time, and collaborative engineering design in a concurrent manner. This paper provides an understanding of the product design in a distributed environment where designers are in different geographic locations and are required to be involved in the design process to ensure successful product design. A design process model that captures the major interactions among stakeholders is presented, based on the observation of cooperation and collaboration. The stakeholders’ interactions are divided into activity and system level to distinguish the interactions in group design activities and design perspective evolution. An initial computer implementation of the design model is presented. The design system consists of a set of tools associated with design and a management system to facilitate distributed designers to support various design activities, especially conceptual design. Our research emphasis of design collaboration in this paper is: (i) Model a Cooperative-collaborative design process; (ii) Support synchronized design activities; and (iii) Structure the complex relations of various design perspectives from engineering disciplines.


2018 ◽  
Vol 158 ◽  
pp. 01021
Author(s):  
Tamara Kostyuchenko ◽  
Nelya Indygasheva

Control moment gyroscope or two-axis balking gyroscope is used in spacecraft orientation systems. The control moment gyroscope is a complex electromechanical system with different parameters which connect by means of specific instant and inverse dependences. This fact could complicate the design process as of getting the optimal parameters the search of construction variations becomes harder. To simplify the control moment gyroscope designing process and increase its efficiency the computer-aided design system could be as highly useful. The computer-aided design system which is used in the present research and described in the article consists of five main subsystems. They cover the main stages of control moment gyroscope designing.


Author(s):  
D T Pham ◽  
Y Yang

The different stages in design are briefly discussed. Examples of previous research into automating the preliminary design stage are described. An architecture for a computer aided preliminary design system is proposed. A prototype system for generating design concepts for transmission devices is presented.


Author(s):  
Raisa Yu. Ovchinnikova ◽  

The article shows that the study of design process as a special activity in graphic design is an art history problem and requires special research methods. It is scientific methodology that makes it pos-sible to achieve reliability in art history knowledge. Attention is drawn to the fact that since the 1960s the methodology of systems theory and activity theory has been a keynote for the development of the design process knowledge in various schools of graphic design. This methodology meets academic criteria and has not lost its value in our days. Based on the principles of this methodology the article analyzes different types of the graphic design process. The objective processes associated with the use of computer technologies in design appear to be the norm and the paradigm of functioning in modern graphic design. Thus, the idea of existence of numerous computer-aided design types is justified. The design objectives of diverse complexity serve here as criteria. On the basis of these objectives traditional, original, and innovative designs are out-lined and comparatively analyzed in the article. It is noted that computer technologies, first, act as an effective tool for the implementation of the forms envisioned by the designer. Second, a computer can be regarded as a creative partner, an agent. Computer technologies possess a unique set of properties and features that open up new opportunities for a creative practice in the field of graphic design. The boundaries of the design practice are changing, and new areas of collective creativity are being estab-lished. In this case the graphic design process is a process that involves efforts of many people. So, individual creativity of professional designers appears to be replaced by the collaboration of interdisci-plinary experts. It is also noted that the growth of computer-aided technologies is too fast for graphic designers to develop a theoretical understanding of them. It results in the duality of assessing the role of methodol-ogy and experience in the graphic design process. On the one hand, the use of design methodology improves efficiency of the design process in comparison with the approach based on experience. On the other hand, there occurs the “extraction” of methodology from the design practice. Research meth-ods of the graphic design process are created under the influence of not only intradisciplinary process-es but also with a view to the messages from other areas of academic knowledge. An example is the use of synergy as a special way of understanding empirical facts accumulated in various fields of aca-demic knowledge. Namely, computer-aided design reveals the non-linearity, a large variety of forms. Herewith, any calculations applied to a huge number of graphic elements change the visual result, creating a new version of the form. It is noted that the use of high-tech computer technologies is quite specific about training designers.


1991 ◽  
Author(s):  
Dennis G. Jackson ◽  
Terry Wright

A computer-based axial fan design system has been developed that allows the designer to rapidly obtain a preliminary axial fan design. Program FANDES allows the designer two options to determine the preliminary design parameters for a single-stage axial fan. The first option allows the designer the ability to design an axial fan using conventional blade-element design techniques. The second option enables the designer to search a database of previously designed fans for a set of scaled fans that will satisfy the current design point requirements. The designer can then refine one of the fans in this set to possibly improve the selected fan’s performance. The database of fans is utilized and maintained by FANDES and new fans are added at the user’s request. This allows for an intelligent program that is constantly learning from previous designs. As more fans are designed and saved to the database the design process becomes more of a selection and refinement process of previously designed fans.


Author(s):  
Jerome P. Jarrett ◽  
Tiziano Ghisu ◽  
Geoffrey T. Parks

The turbomachinery aerodynamic design process is characterized both by its complexity and the reliance on designer experience for success. Complexity has led to the design being decomposed into modules; the specification of their interfaces is a key outcome of preliminary design and locks-in much of the final performance of the machine. Yet preliminary design is often heavily influenced by previous experience. While modularity makes the design tractable, it complicates the appropriate specification of the module interfaces to maximize whole-system performance: coupling of modularity and designer experience may reduce performance. This paper sets out to examine how such a deficit might occur and to quantify its cost in terms of efficiency. Two disincentives for challenging decomposition decisions are discussed. The first is where tried-and-tested engineering “rules of thumb” accord between modules: the rational engineer will find alluring a situation where each module can be specified in a way that maximizes its efficiency in isolation. The second is where there is discontinuity in modeling fidelity, and hence difficulty in accurately assessing performance exchange rates, between modules. In order to both quantify and reduce the potential cost of this coupling we have recast the design problem in such a way that what were previously module interface constraints become key system design variables. An example application of our method to the design of a generic turbofan core compression system is introduced. It is shown that nearly 1 percentage point equivalent compressor adiabatic efficiency can be saved.


Author(s):  
Hongde Jiang ◽  
Kepeng Xu ◽  
Baoqing Li ◽  
Xinzhong Xu ◽  
Qing Chen

A new, precise full-dimensional (PFD) design system for multistage steam turbine has been developed in the past decades by the present authors. The remarkable features of PFD system different from conventional 3D design methodology are as followings: a). Taking into account of unsteady aerodynamic impact on steam turbine performance, b). Simulating 3D real structure of blade and non-blade components without geometric simplification, c). Coupling of aerodynamic design with FEM structure- mechanical analysis for blade and non-blade components. Three levels of design and optimization at global, regional and local level for steam turbine cycle and flow path design are described. The PFD design system consists of conceptual (0D), 1D, Q3D, F3D/4D aerodynamic design and optimization codes, structure analysis and mechanical design (MD) tools, and pre- and post-processing software. In this part of present paper a detail description of philosophy and architecture of the PFD design system, function of each design tools, principles for design consistency are given. The PFD design system is a new plateau of present author’s long-term effort to bring multistage steam turbine design from a simple, passive, empirical-based situation toward a comprehensive, active, knowledge-based environment.


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