scholarly journals A preliminary design study for an expander liquid oxygen turbopump

2019 ◽  
Author(s):  
C. Maeding ◽  
L. Souverein ◽  
D. Hummel ◽  
S. Koenigbauer ◽  
A. Wagner ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Performance Estimation ◽  
Liquid Oxygen ◽  
Rocket Propulsion ◽  
Thrust Chamber ◽  
Design Activities ◽  
Speed Selection ◽  
Aided Design ◽  
Structural Aspects ◽  
Turbine Drive

In the recent years, Airbus DS GmbH started a turbopump initiative to buildup fundamental capabilities in analyzing and designing turbomachinery within a German national funded program “TARES.” Turbomachinery is widely used in different rocket propulsion systems and include such parts as pumps and turbines. Turbines are used for generating power required by pumps in order to feed the propellants to the thrust chamber. The paper is dedicated to present an overview about currently ongoing conceptual design activities of turbomachinery covering the main design phases like TPA (TurboPump Assembly) layout tradeoff; rotational speed selection with respect to efficiency and cavitation; flow path design techniques including blade profiling; computer-aided design (CAD) work; and preliminary structural analyses. This paper presents the main outcome applying the established design logic to a liquid oxygen (LOx) turbomachinery. The component is designed based on a dedicated specification for an expander cycle type engine. This includes a LOx pump unit comprising inducer and impeller as well as a subsonic single stage reaction turbine. For the turbine drive, gaseous hydrogen (GH2) heated within the thrust chamber cooling circuit is used. Within this paper, a general overview about the preliminary work results of pump and turbine sizing, profiling, performance estimation as well as structural aspects is given.

Computer-Aided Form Generation for Product Design

2010 ◽  
Vol 97-101 ◽  
pp. 3785-3788
Author(s):  
Hung Cheng Tsai ◽  
Tien Li Chen ◽  
Hung Jung Tsai ◽  
Fei Kung Hung
Keyword(s):  
Computer Aided Design ◽  
Product Form ◽  
Knowledge Based ◽  
Blending Method ◽  
Computer Aided ◽  
Design Activities ◽  
Form Design ◽  
Product Form Design ◽  
Aided Design ◽  
Product Forms

The product form design activities involve a high degree of uncertainty and complexity and are therefore not easily formulated, coded and regularized. Consequently, very few of the computer-aided design approaches presented in the literature can support the conceptual form design tasks typically performed at the preliminary stages of a product’s development cycle. To enable designers to perform their design activities more objectively and efficiently, this paper combines the principles of fuzzy set theory, the shape-blending method and genetic algorithms to generate a knowledge-based approach for product form design based upon a database describing the relationships between different product forms and their corresponding perceptual image evaluations.

Design Synthesis in a Virtual Environment

2001 ◽  
Author(s):  
Douglas Maxwell ◽  
Rob King ◽  
Alley Butler
Keyword(s):  
Virtual Environment ◽  
Computer Aided Design ◽  
Stereoscopic Vision ◽  
Design Environment ◽  
Design Synthesis ◽  
Cad System ◽  
Gestural Interface ◽  
Design Activities ◽  
Immersive Environment ◽  
Aided Design

Abstract Traditional computer-aided design/engineering (CAD/CAE) is performed in a two-dimensional (2D) environment. Through the CAD system demonstration described in this paper, an alternative to the existing 2D technology for design of products is described. This alternative in which design synthesis is accomplished in a stereoscopic or immersive environment is called the Design Synthesis Virtual Environment or DSVE. Stereoscopic vision permits depth perception and provides perception of “real world” 3D existence. This DSVE technology, as defined in this paper, provides a virtual or immersive environment, computer-generated, but seemingly real. The authors argue that significant advantages are possible when an immersive environment such as the DSVE is used for design synthesis. In the Design Synthesis Virtual Environment a gestural interface is used, and it is further argued that designers can perform design activities intuitively by using a more natural gestural interface within the design environment, allowing more rapid, efficient actions to create and/or modify product geometry. As evidence, this paper reports on a demonstration conducted in a Design Synthesis Virtual Environment. Operation of the DSVE is explained, and two example problems are worked. Conclusions are drawn about the effectiveness of the DSVE and the potential for further development.

Bringing Human Performance Data to the Design Table

1993 ◽  
Vol 37 (16) ◽  
pp. 1087-1090 ◽  
Author(s):  
Thomas R. Cona ◽  
Donald L. Monk
Keyword(s):  
Human Factors ◽  
Computer Aided Design ◽  
Human Performance ◽  
Information Access ◽  
Relevant Information ◽  
Common Denominator ◽  
Human Engineering ◽  
Computer Aided ◽  
Design Activities ◽  
Aided Design

Product design is often viewed as being a heterarchical and iterative process, possessing both systematic and chaotic qualities. However, a common denominator across all design activities is the access and utilization of information. In today's computer-aided design market, most of the available tools are narrowly focused on specific computational details for individual stages of design. Aids are needed to support information access and utilization during all stages of the design process. The application of human engineering and ergonomics data by designers is an increasingly challenging problem. Locating and understanding relevant information so that it can be applied to specific design issues is difficult given the abundance of existing and new data available. This is further complicated, in that the data are typically written to communicate research results to other human factors specialists. A new software product, Computer Aided Systems Human Engineering: Performance Visualization Subsystem (CASHE:PVS), is described which will assist the designer during the decision making process, maximizing creative and analytical abilities while minimizing costs due to design time and errors. The software contains several features to enhance the designer's ability to interpret and apply the human factors data available in the product. Phenomena descriptions in text, figures, and tables are combined with experiential information via simulations, animations, and audio. This provides the user a unique and rich understanding of human performance phenomena and how they relate to the design of new products.

scholarly journals A Design Approach Of Mechanical Assemblies Based On MBSE And CAD Models Interoperability

2021 ◽  
Author(s):  
Rihab Brahmi ◽  
Imen Belhadj ◽  
Moncef Hammadi ◽  
Nizar Aifaoui ◽  
Jean-Yves Choley
Keyword(s):  
Computer Aided Design ◽  
Technological Development ◽  
Collaborative Work ◽  
Point Of View ◽  
Mechanical Assemblies ◽  
Development Cycle ◽  
Complexity Problem ◽  
Design Activities ◽  
Cad Models ◽  
Aided Design

Abstract The technological development of the last decades have been able to push human to develop their needs, so a way to new demands were opened and this can lead to a complexity problem. Thereby, a good interoperability between the product design activities can lead to the possibility of ensuring a promising satisfaction to all requirements. However, the major problem is the enormous discontinuity between them. Indeed, each one treats the product from its point of view without recourse to the requirements defined by others. This paper is interested in the collaborative work that brings together the system engineer, who deals with the system from a global view, and the designer, who is a specialist in the detailed design, in order to validate requirements. A new methodology has been proposed to define the role of each one in the design process. This methodology focuses on the product development cycle from the analysis of needs to the validation phase. This obviously requires interoperability between the two domains of Model Based System Engineering (MBSE) and Computer Aided Design (CAD). Based on a pedal bicycle case study which is an industrial mechatronic product, the proposed methodology will be illustrated for validation and highlighting its advantages and limitations.

scholarly journals Ontological approach to the formation of subject-oriented knowledge bases in the field of computer-aided design

2019 ◽  
Vol 298 ◽  
pp. 00065
Author(s):  
Andrey Cherepashkov ◽  
Anastasia Sharaukhova
Keyword(s):  
Computer Aided Design ◽  
Knowledge Bases ◽  
Subject Area ◽  
Cad Systems ◽  
Ontological Approach ◽  
Computer Aided ◽  
Design Activities ◽  
Design Systems ◽  
The Subject ◽  
Aided Design

The problem of the formation of subject-oriented knowledge bases in the subject area of operation of computer-aided design systems is discussed. One of the trends in the development of CAD systems is their intellectualization through the development of a system-wide environment, including the means of methodological support of the design activities of users. It is proposed to use the otological approach in identifying and updating the content of knowledge bases used by target CAD personnel. The results of an experiment on the development of a targeted taxonomy in the subject area of computer-aided design of engineering products are presented.

Towards a Geometric Deviation Model of Product in CAD Environment

2013 ◽  
Author(s):  
Dinh Son Nguyen
Keyword(s):  
Computer Aided Design ◽  
Product Life Cycle ◽  
Product Performance ◽  
Product Modeling ◽  
Modeling Technology ◽  
Nominal Model ◽  
Current Product ◽  
Geometric Deviations ◽  
Design Activities ◽  
Aided Design

Due to development of science and information technology, computer has become an effective and useful tool supporting for product design activities. The numerical model of product is quickly created in Computer-Aided-Design (CAD) environment by product designers. However, this model is a nominal model representing ideal geometric information of product. It is not able to cope with various kinds of disturbances during the whole product life-cycle, especially in manufacturing stage where geometric deviations of product are generated and accumulated by material property defects, manufacturing process errors, tooling deformation, etc. This is a limitation of the current product modeling technology. In addition, most of the simulations of product performance such as kinematics, dynamics, failure, etc., are carried out by using this nominal model. It can make the quality of the product designed not to fully meet the requirements of customers and users. Thus, the paper proposes a method that allows integrating geometric deviations of product in CAD environment. The aim is to deal with the above issues and to take into account various disturbances in product performance prediction.

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