{"id":{"repo_id":"nus","oai_identifier":"oai:scholarbank.nus.edu.sg:10635/172107"},"canonical_url":"https://search.dev.ndltd.org/etd/nus/oai:scholarbank.nus.edu.sg:10635/172107","repository":{"repo_id":"nus","name":"National University of Singapore","base_url":"https://scholarbank.nus.edu.sg/oai/request"},"display":{"title":"AN INTEGRATED CAD TOOL BASED ON DESIGN INTENT","abstract":"The increasing understanding and formalizing of the design process as well as the ever-improving sophistication of software and hardware how facilitated research efforts to use computers more effectively in aiding design. Since computers haw capabilities for correctly and quickly processing large amounts of information, much is being done to increase their range of functionalities in supporting design and, more importantly, optimizing the interaction between man and machine so that the strengths of each can be exploited fully. The capture of design intent through artificial intelligence (Al) facilitates consistent design and the propagation of decisions along the product development cycle. This thesis discusses the development of an integrated design and planning decision tool. The design and pre-manufacturing planning of the integrated circuit (IC) encapsulation mould were chosen for the case study. The work addressed some inherent intricacies of mould design and also attempted to define roles for both man and machine in a computer-aided design and pre-manufacturing planning scenario. The five distinct modules developed were modelled after industrial practices and are as follows: (a) design and configuration and specification; (b) parameteric resin flow path design; (c) instantiation and dimensional variation of the mould body assembly; (d) instantiation and variation of inter-penetrating mould components; and, (e) pre-manufacturing planning information generation. The output of the system can be used for machining and related manufacturing processes. In the system that was created, geometric design input is dimension-driven while the more qualitative configuration information is input through a graphical interface. One of the common cavity-to-pot configurations was used for parameteric design of the flow path. The mould assembly relationships treated in this study are adjacency and coplanarity. A simple mechanism to extract and utilize the dimensional correlations was employed successfully. For dimensioning and positioning of inter-penetrating components, an interactive approach was employed whereby the system assists (using configuration information) rather than decides. At the end of each design session through the system, information for individual mould blocks can be readily extracted for manufacturing planning, on account of the object-oriented nature of modelling. The system was developed within the PC-based Microsoft Windows 3.1 environment using AutoCAD by AutoDESK for the CAD interface and Kappa-PC, an expert system shell by Intellicorp, for object-oriented modelling, reasoning and non-geometric interaction. The techniques that were implemented are parametricity, object-oriented, modelling and rules. Design intent was captured through configuration information, which was then used to guide detail design and design modifications. Parametricity is a useful method for volume-based flow design because it removes the need for geometry reconstruction and involved calculations during the iterative process. This allows the designer to utilize and therefore better understand the key parameters of the flow system. Further work would be to have a module for feature-based construction of generic models that would then be parameterized for iterative volume balancing. Object-oriented modelling and rules were employed to manage the complexity of mould assembly relationships. The problem addressed here is the propagation of constraints as dimensions are incrementally instantiated. A simple duplet reduction and concatenation mechanism enables circular constraints to be broken down and the object-based network of monitors actuate constraint propagation.","abstract_html":"The increasing understanding and formalizing of the design process as well as the ever-improving sophistication of software and hardware how facilitated research efforts to use computers more effectively in aiding design. Since computers haw capabilities for correctly and quickly processing large amounts of information, much is being done to increase their range of functionalities in supporting design and, more importantly, optimizing the interaction between man and machine so that the strengths of each can be exploited fully. The capture of design intent through artificial intelligence (Al) facilitates consistent design and the propagation of decisions along the product development cycle. This thesis discusses the development of an integrated design and planning decision tool. The design and pre-manufacturing planning of the integrated circuit (IC) encapsulation mould were chosen for the case study. The work addressed some inherent intricacies of mould design and also attempted to define roles for both man and machine in a computer-aided design and pre-manufacturing planning scenario. The five distinct modules developed were modelled after industrial practices and are as follows: (a) design and configuration and specification; (b) parameteric resin flow path design; (c) instantiation and dimensional variation of the mould body assembly; (d) instantiation and variation of inter-penetrating mould components; and, (e) pre-manufacturing planning information generation. The output of the system can be used for machining and related manufacturing processes. In the system that was created, geometric design input is dimension-driven while the more qualitative configuration information is input through a graphical interface. One of the common cavity-to-pot configurations was used for parameteric design of the flow path. The mould assembly relationships treated in this study are adjacency and coplanarity. A simple mechanism to extract and utilize the dimensional correlations was employed successfully. For dimensioning and positioning of inter-penetrating components, an interactive approach was employed whereby the system assists (using configuration information) rather than decides. At the end of each design session through the system, information for individual mould blocks can be readily extracted for manufacturing planning, on account of the object-oriented nature of modelling. The system was developed within the PC-based Microsoft Windows 3.1 environment using AutoCAD by AutoDESK for the CAD interface and Kappa-PC, an expert system shell by Intellicorp, for object-oriented modelling, reasoning and non-geometric interaction. The techniques that were implemented are parametricity, object-oriented, modelling and rules. Design intent was captured through configuration information, which was then used to guide detail design and design modifications. Parametricity is a useful method for volume-based flow design because it removes the need for geometry reconstruction and involved calculations during the iterative process. This allows the designer to utilize and therefore better understand the key parameters of the flow system. Further work would be to have a module for feature-based construction of generic models that would then be parameterized for iterative volume balancing. Object-oriented modelling and rules were employed to manage the complexity of mould assembly relationships. The problem addressed here is the propagation of constraints as dimensions are incrementally instantiated. A simple duplet reduction and concatenation mechanism enables circular constraints to be broken down and the object-based network of monitors actuate constraint propagation.","abstract_has_math":false,"creators":["KHAW HONG CHER"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1995,"date_issued":"1995","date_published":"1995","updated_at":"2026-07-24T03:32:43Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["KHAW HONG CHER"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["1995"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://scholarbank.nus.edu.sg/handle/10635/172107"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://scholarbank.nus.edu.sg/bitstreams/1c4e108b-7190-4844-bcb0-0249b0aa8779/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The increasing understanding and formalizing of the design process as well as the ever-improving sophistication of software and hardware how facilitated research efforts to use computers more effectively in aiding design. 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The five distinct modules developed were modelled after industrial practices and are as follows: (a) design and configuration and specification; (b) parameteric resin flow path design; (c) instantiation and dimensional variation of the mould body assembly; (d) instantiation and variation of inter-penetrating mould components; and, (e) pre-manufacturing planning information generation. The output of the system can be used for machining and related manufacturing processes. In the system that was created, geometric design input is dimension-driven while the more qualitative configuration information is input through a graphical interface. One of the common cavity-to-pot configurations was used for parameteric design of the flow path. The mould assembly relationships treated in this study are adjacency and coplanarity. A simple mechanism to extract and utilize the dimensional correlations was employed successfully. For dimensioning and positioning of inter-penetrating components, an interactive approach was employed whereby the system assists (using configuration information) rather than decides. At the end of each design session through the system, information for individual mould blocks can be readily extracted for manufacturing planning, on account of the object-oriented nature of modelling. The system was developed within the PC-based Microsoft Windows 3.1 environment using AutoCAD by AutoDESK for the CAD interface and Kappa-PC, an expert system shell by Intellicorp, for object-oriented modelling, reasoning and non-geometric interaction. The techniques that were implemented are parametricity, object-oriented, modelling and rules. Design intent was captured through configuration information, which was then used to guide detail design and design modifications. 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The five distinct modules developed were modelled after industrial practices and are as follows: (a) design and configuration and specification; (b) parameteric resin flow path design; (c) instantiation and dimensional variation of the mould body assembly; (d) instantiation and variation of inter-penetrating mould components; and, (e) pre-manufacturing planning information generation. The output of the system can be used for machining and related manufacturing processes. In the system that was created, geometric design input is dimension-driven while the more qualitative configuration information is input through a graphical interface. One of the common cavity-to-pot configurations was used for parameteric design of the flow path. The mould assembly relationships treated in this study are adjacency and coplanarity. A simple mechanism to extract and utilize the dimensional correlations was employed successfully. For dimensioning and positioning of inter-penetrating components, an interactive approach was employed whereby the system assists (using configuration information) rather than decides. At the end of each design session through the system, information for individual mould blocks can be readily extracted for manufacturing planning, on account of the object-oriented nature of modelling. The system was developed within the PC-based Microsoft Windows 3.1 environment using AutoCAD by AutoDESK for the CAD interface and Kappa-PC, an expert system shell by Intellicorp, for object-oriented modelling, reasoning and non-geometric interaction. The techniques that were implemented are parametricity, object-oriented, modelling and rules. Design intent was captured through configuration information, which was then used to guide detail design and design modifications. Parametricity is a useful method for volume-based flow design because it removes the need for geometry reconstruction and involved calculations during the iterative process. This allows the designer to utilize and therefore better understand the key parameters of the flow system. Further work would be to have a module for feature-based construction of generic models that would then be parameterized for iterative volume balancing. Object-oriented modelling and rules were employed to manage the complexity of mould assembly relationships. The problem addressed here is the propagation of constraints as dimensions are incrementally instantiated. 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