Computer-aided clothing thermal functional engineering design

Pao Yue-kong Library Electronic Theses Database

Computer-aided clothing thermal functional engineering design

 

Author: Mao, Aihua
Title: Computer-aided clothing thermal functional engineering design
Degree: Ph.D.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations
Textile fabrics -- Thermal properties
Clothing and dress -- Thermal properties
Computer-aided design
Department: Institute of Textiles and Clothing
Pages: xxiv, 309 p. : ill. ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2321057
URI: http://theses.lib.polyu.edu.hk/handle/200/5576
Abstract: This thesis presents and realizes a strategy of computer-aided clothing thermal engineering design. By the application and integration of multidisciplinary knowledge, a computational simulation-based and computer-aided technique is developed to quantify the thermal performance of clothing and its impact on the thermal biology of the human body in various wearing situations. Theoretical framework has been developed with simulation models, computational schemes, software architecture and CAD software systems. With the achievements of the research, this strategy has been realized in a systematical and scientific way and can be delivered to the user as a user-friendly computer-aided design tool. Clothing thermal engineering design is an innovative application of engineering principles in clothing design and involves the knowledge across a range of disciplines, including physics and biological mechanisms, computational simulation models, computational and CAD technologies. The requirements on thermal functions of clothing are identified by revealing the relationships between the thermo-physiology of human body and physical mechanisms governing the heat and moisture transfer in clothing. A systematical definition of clothing thermal engineering design is presented and an innovative multi-disciplinary framework derived from different disciplines is proposed to apply and integrate involved knowledge and data. In the framework, two central components in clothing thermal engineering are identified as computational simulation and computer-aided design system. In order to utilize the capability of computational simulation models, a set of multi-scale simulation models is selected and assessed by using a set of engineering design criteria to model the thermal behaviors involved the clothing system. The data availability of the parameters in the models is investigated and made clear for engineering applications. To generate the numerical solutions of the simulation models, multi-structural computational schemes are developed to implement the numerical algorithms of computational simulation for the purpose of clothing thermal engineering design. Furthermore, the influence of various coefficients on the simulation results is studied to control the accuracy of simulation results.
In order to achieve the aim of computer-aided clothing thermal engineering design, an innovative software architecture is proposed and developed with the identification of user requirements, and the functional components and their relationships in the architecture. The computer-aided design system is developed using objected-oriented method to make the system an open and flexible structure so that it can be easily and economically maintained and updated. An engineering database is designed and developed to support the engineering design process with the software system. Under the designed architecture, two software systems are developed for clothing multi-layer design and multi-style design corresponding to different application requirements. The functionalities and interfaces provided by the systems enable the user to design, simulate, preview and analyze the thermal performance of clothing during the wearing period. Design cases carried out using the software systems are illustrated to show the design procedures and system functionalities. The accuracy of the systems is validated by comprising simulation results with the experimental measurements derived in wear trials using human subjects. In summary, the strategy of computer-aided clothing thermal engineering design has been presented with systematical definition and multi-disciplinary framework, which is realized by the design and development of multi-scale computational simulation structures and a computer-aided design system. Using the software systems, users can carry out dynamic iterative design and engineering of clothing, which are supported by database, data visualization software to preview the thermal performance of clothing with scientific data presentation, as well as communicative 2D and 3D visual illustrations.

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