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.

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.

Designing Futuristic Eyeglasses With Innovative Marketing Strategy Using Product Life Cycle Management

2014 ◽  
Vol 1 (1) ◽  
pp. 209-214
Author(s):  
Ahmed Mohsin Khalil ◽  
Georgiana Dobrota ◽  
Susu Paul ◽  
Paul Dan Brindasu
Keyword(s):  
Life Cycle ◽  
Computer Aided Design ◽  
Product Life Cycle ◽  
Research Work ◽  
Life Cycle Management ◽  
Market Strategy ◽  
Product Life ◽  
Product Life Cycle Management ◽  
Smart Glasses ◽  
Aided Design

AbstractGlasses are becoming more and more important as part of our daily life. The product is an interesting and general. People's needs in this regards are different. In this research work a case study of product life cycle management of smart glasses for future use is presented. Research is thorough and quantitative. Basic objectives that were to establish are the reasons for wearing sunglasses, the most important characteristics that glasses must meet, setting the fashion trends for glasses and provides market strategy for selling glasses until recycling. On the basis of research done on sample of 30 people, different option were put in front of them the most important were chosen, which are, built-in speaker for playback, capacity to store memory, connectivity to external devices (PC) and Radio/MP3. Market strategy is also set for the glasses from factory to the recycling including customer feedback, environmental concerns. Conceptual design of the glasses using computer aided design is also presented. This multidimensional product is an achievement in innovation, entrepreneurship and gives good insight into the implementation of engineering education through product life cycle.

MCAD-ECAD Integration: Overview and Future Research Perspectives

2007 ◽  
Author(s):  
Kenway Chen ◽  
Dirk Schaefer
Keyword(s):  
Computer Aided Design ◽  
Electrical Engineering ◽  
Rapid Change ◽  
Background Information ◽  
Future Research ◽  
Product Modeling ◽  
Directional Information ◽  
Research Perspectives ◽  
Computer Aided ◽  
Aided Design

The domain of Electrical Computer-Aided Design and Engineering (ECAD/ECAE) has been subject to major and rapid change over the past couple of years. Electrical Engineering Computer-Aided Design (CAD) tools developed in the early to mid-1990s no longer meet future requirements. Consequently, a new generation of Electrical Engineering CAD systems has been under development for about a decade now. An overview of advances in this field is presented in the introductory part of this paper. This overview also sets the context and provides background information for the main topic, MCAD-ECAD-integration, to be addressed in the remainder of this paper. Many complex engineered systems encompass mechanical as well as electrical engineering components. Unfortunately, contemporary CAE environments do not provide a sufficient degree of integration in order to allow for multi-disciplinary product modeling and bi-directional information flow (i.e. automated design modifications on either side) between mechanical and electrical CAD domains. Overcoming this barrier of systems integration would release a tremendous efficiency potential with regard to the efficient development of multidisciplinary product platforms and configurations. An overview of the state-of-the-art in MCAD-ECAD integration is presented. In addition, associated research questions are postulated and potential future research perspectives discussed.

Study on Integrated Method of Medical Implant Manufacture Based on Rapid Prototyping Technology

2008 ◽  
Vol 375-376 ◽  
pp. 353-357 ◽  
Author(s):  
Wei Ping Wang ◽  
Singare Sekou ◽  
Ya Xiong Liu ◽  
Di Chen Li ◽  
Bing Heng Lu ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Digital Information ◽  
Medical Implant ◽  
Integrated Method ◽  
Modeling Technology ◽  
Facial Prosthesis ◽  
Skull Model ◽  
Aided Design

The traditional method to manufacture the medical implant or prosthesis is based on sculpting and on the tissue site,or takes impressions of the entire face about human. The accuracy and efficiency of medical implant or prosthesis produced by conventional method is heavily relied on the skill and experience of both designer and manufacturer. In this paper, an integrated method of medical implant manufacture is approached. This integrated strategy was to establish a system that allows fabrication of facial prosthesis from digital information, and integrates the rapid prototyping with modeling technology of complex three-dimensional geometry from high-resolution non-invasive imaging, reverse engineering and computer aided design. The research results have shown that the integrated method can produce more exact-fit medical implant, that is, the physical model of the implant is more exactly fitted on the skull model. The advantages of this method are that the surgeon can plan and rehearse the surgery in advance, and a less invasive surgical procedure, and less time-consuming reconstructive, and an adequate esthetic can result.

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.

scholarly journals Posture Optimization Algorithm for Large Structure Assemblies Based on Skin Model

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Wei Zhang ◽  
Luling An ◽  
Peter Sherar ◽  
Wei Tian
Keyword(s):  
Computer Aided Design ◽  
Optimization Method ◽  
Skin Model ◽  
Manufacturing Defects ◽  
Assembly Simulation ◽  
Geometric Deviations ◽  
Design Deficiencies ◽  
Machinery Manufacturing ◽  
Aided Design ◽  
Geometric Variation

Geometric deviations inevitably occur in product manufacturing and seriously affect the assembly quality and product functionality. Assembly simulations on the basis of computer-aided design (CAD) package could imitate the assembly process and thus find out the design deficiencies and detect the assemblability of the components. Although lots of researches have been done on the prediction of assembly variation considering the geometric errors, most of them only simplify the geometric variation as orientation and position deviation rather than the manufacturing deformation. However, in machinery manufacturing, even if the manufacturing defects are limited, they could propagate and accumulate through components and lead to a noncompliant assembly. Recently, many point-based models have been applied to assembly simulation; however they are mainly interested in simulating the resulting positions of the assembled parts and lack the consideration of the postprocessing after positioning. This paper enriches the complete assembly simulation process based on skin model and presents a simple and effective posture evaluation and optimization method. The studied approach includes a software algorithm applied to evaluate the contact state of the assembly parts and a mathematical model based on the particle swarm optimization to acquire the optimal assembly posture. To verify the efficiency and feasibility of the proposed method, a case study on the aircraft wing box scaling model assembly is performed.

Method for characterization and enhancement of 3D printing by binder jetting applied to the textures quality

2017 ◽  
Vol 37 (2) ◽  
pp. 162-169 ◽  
Author(s):  
Julien Gardan
Keyword(s):  
Image Processing ◽  
3D Printing ◽  
Computer Aided Design ◽  
Product Life Cycle ◽  
Content Type ◽  
Powder Bed ◽  
3D Printed ◽  
Aided Design ◽  
Binder Jetting

Purpose This paper aims to present a technical approach to evaluate the quality of textures obtained by an inkjet during binder jetting in 3D printing on a powder bed through contours detection to improve the quality of the surface printed according to the result of the assembly between the inkjet and a granular product. Design/methodology/approach The manufacturing process is based on the use of computer-aided design and a 3D printer via binder jetting. Image processing measures the edge deviation of a texture on the granular surface with the possibility of implementing a correction in an active assembly through a “design for manufacturing” (DFM) approach. Example application is presented through first tests. Findings This approach observes a shape alteration of the printed image on a 3D printed product, and the work used the image processing method to improve the model according to the DFM approach. Originality/value This paper introduces a solution for improving the texture quality on 3D printed products realized via binder jetting. The DFM approach proposes an active assembly by compensating the print errors in upstream of a product life cycle.

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