for serving as my committee members and providing valuable suggestions and comments for this diss... more for serving as my committee members and providing valuable suggestions and comments for this dissertation. A big "thank you" goes to Dr. Bicheng Zhu for all his help in fundamental research problem discussions, encouragement, and suggestions for life. Further thanks go to the lab colleagues and friends, including Omer Yaman, Yunpeng Li, Hang Yin, and Kai Sun, for their good suggestions in my research work. Special thanks go to Dr. Xianrui Wang and Dr. Xu Yan, for their friendship and support across the world. I also want to thank my friends Dr. Jing Wang, Zhengyi Song, and Daiyang Gao for their companionship in graduate school. Finally, I would like to acknowledge the most important persons in my life-my parents Zhijian Zhang and Huiying Jia for their unconditional love. Without their support, I could not overcome all the challenges I faced all these years. v
Journal of Computing and Information Science in Engineering
Disassembly, a process of separating the end of life (EOL) product into discrete components for r... more Disassembly, a process of separating the end of life (EOL) product into discrete components for re-utilizing their associated residual values, is an important enabler for the sustainable manufacturing. This work focuses on the modeling of the disassembly planning related information and develops a disassembly information model (DIM) based on an extensive investigation of various informational aspects in the domain of disassembly planning. The developed DIM, which represents an appropriate systematization and classification of the products, processes, uncertainties, and degradations related information, follows a layered modeling methodology in which DIM is subdivided into layers with the intent to separate general knowledge into different levels of abstractions and reach a balance between information reusability and information usability. Two prototype disassembly planning related applications have been incorporated to validate the usability and reusability of the developed DIM.
Journal of Computing and Information Science in Engineering
There is a dire need for the development of an integrated information model for organizing and ma... more There is a dire need for the development of an integrated information model for organizing and managing material and manufacturing related information, required for any product realization. In this paper, such an information framework for product, process, and material modeling has been proposed to support the product's form, function and behavior, its physical and functional decompositions, its design requirements and design rationale, and its material and process needs. A detailed, real-life case study of the waterjet intensifier design system has been presented to show how this proposed framework could support, capture, and utilize all necessary information required for the selection of the intensifier's high-pressure cylinder material. The framework will also be able to provide sufficient information to quantify the ecocompatibility of products.
The International Journal of Advanced Manufacturing Technology, 2015
ABSTRACT Disassembly, as one of the core steps in the end of life (EOL) activities, has been a po... more ABSTRACT Disassembly, as one of the core steps in the end of life (EOL) activities, has been a popular topic both in industrial and academic areas. Unlike assembly, any practical disassembly process planning, which is very important for material recycling or component reuse, is still a topic of active research. One major obstacle in developing an optimal disassembly process planning system is the uncertain characteristics of the EOL products (uncertain information), such as the quality and quantity of the components and parts, which normally make a deterministic disassembly process planning impossible. How to represent and further use such uncertain information in reasoning about a realistic optimal disassembly process sequence are the most important research issues. This paper addresses these issues by developing a disassembly information framework which consists of both an ontology-based information model (domain semantics and rules) and a computational model (process planning generation methodology). The explicit domain concepts, relationships, or rules developed in the ontology-based information enhance the process planning generation methodology (computational model) and thus make the planning process efficient and more realistic. Examples are used in the end to illustrate the use of the proposed framework and methodology.
ABSTRACT In this study, a functional and behavioral representation model for collaboration in pro... more ABSTRACT In this study, a functional and behavioral representation model for collaboration in product development is developed to represent assembly-related product knowledge, including its geometry, spatial relationships, function and behavior, which will be used to create a knowledge representation scheme to capture, store, and retrieve product knowledge. In this model, the function, behavior and artifact information is interrelated based on assembly associations. Functional and behavioral inputs and outputs are defined based on the spatial relationships in the assembly, as well as on the geometry of the product. The functional associations among artifacts define the “Behavior Model” with engineering formulas and physical rules. “Behavior Models” then define the behavior of the artifact. Behavior has four different forms for different phases in life cycle: (1) Intended Behavior in the conceptual design phase, (2) Estimated Behavior in the design phase, (3) Observed Behavior in the operation stage, and (4) Evaluated Behavior in the design and operation phases. When an unintended event (behavior) occurs, an additional function can be added to eliminate that effect. As a result, the functional and behavioral model is updated dynamically.
Robotics and Computer-Integrated Manufacturing, 1988
Presently available CAD data models have no problem handling the basic shape design of an object ... more Presently available CAD data models have no problem handling the basic shape design of an object as required but they are not properly manufacturing-oriented. It is not possible to represent the dimensioning and tolerancing information or other technological information (such as material data, the surface roughness and accuracy data, feature information, etc.). This paper discusses the requirements of a new CAD data model and proposes a feature-based representation scheme based on the hybrid CSG/B-Rep data structure. This hybrid structure exploits the advantages of both CSG and B-Rep models in representing tolerance information. A relational graph structure (face-based data model of B-Rep) of the object is maintained at each hierarchical level of object construction for associating tolerance and other attributes. 2. REVIEW OF RELEVANT WORK Solid modeler based investigation of D&T representational issues was initiated by Requlcha 13' 14 of the Production Automation Project, University of
This paper identifies some of the problems and ambiguities with existing standards for establishi... more This paper identifies some of the problems and ambiguities with existing standards for establishing datums in manufactured components. Most of the criteria as described in the standards do not uniquely define the datums from measured data points of manufactured features. Three ...
Journal of Manufacturing Science and Engineering, 2002
Stability analysis plays a critical role in determining the applicability of a fixture design. Th... more Stability analysis plays a critical role in determining the applicability of a fixture design. This paper reports the development of a computational methodology for quantitatively analyzing the workpiece’s stability in the automated fixture design (AFD) environment. In stability analysis, the virtual disturbance which is expressed as a wrench in the screw coordinates and has the same tendency as those fixturing and machining forces to destabilize the workpiece is adopted in the study, and the stability of the workpiece is characterized based on its capability to overcome the virtual disturbance. The stability characteristics for each fixturing configuration (i.e., positions for fixturing components of supporters, locators and clamps) itself are obtained from the stability analysis and used in the re-design process to determine the better design of fixturing configuration.
AbstractIn this paper, a product life cycle design template used to assist in the development of ... more AbstractIn this paper, a product life cycle design template used to assist in the development of a product knowledge base is introduced. The paper argues that following this model should result in a focus on real-world product behavior beyond the expected product performance by directing the questions from what should happen when the products interact in the universe to what can happen at each design juncture. The template may be simply used as a thought process with a pad and pencil for recording notes for simple or on-the-fly design decisions. The idea of using the templates as a tool could be more formalized for larger designs and knowledge-base development. In this paper, the concept has been demonstrated in building the knowledge base for the geosolar exergy storage technology (GEST) house.
Establishing an "intelligent link" between conventional CAD systems and different analy... more Establishing an "intelligent link" between conventional CAD systems and different analytical tools like finite element analysis packages is a significant concern in design automation. This paper proposes the use of knowledge engineering for the unification process and outlines the dimensions of an overall framework for an integrated CAD/FEM system A prototype system for structural design of aircraft wings has been implemented in this integrated environment.
Neural network model for selecting machining parameters in fixture design. Utpal Roy, Jianmin Lia... more Neural network model for selecting machining parameters in fixture design. Utpal Roy, Jianmin Liao Integrated Computer-Aided Engineering 3:33, 149-157, 1996. This paper describes the training and implementation of an artificial ...
A critical challenge to Engineer-To-Order (ETO) manufacturing firms is the long lead time in prod... more A critical challenge to Engineer-To-Order (ETO) manufacturing firms is the long lead time in product development, due to the nature of highly customized products produced in low volume. The emergent Data-Driven Design (D 3) approach is a possible solution to alleviate this tension by utilizing rich product-related data throughout the product's lifecycle and building reusable data analytics models, in order for more accurate lead time estimate in a continuously updated way. In this paper, we propose a product lifecycle management (PLM) based framework to enable Prescriptive Analytics capability in ETO companies to improve their lead time estimate. The PLM has been extended to support data analytics model lifecycle management by incorporating a formal data analytics process model, CRISP-DM. It also implements a model-based approach for optimization model development, management, and execution. The proposed PLM-based Predictive Analytics framework has been applied in a local ETO manufacturing company for testing and validation.
Journal of Computing and Information Science in Engineering
Information exchange and sharing become a necessity for digital factory but they have been more c... more Information exchange and sharing become a necessity for digital factory but they have been more challenging as the industry is computerized more. This is mainly because the capabilities of computerized systems have grown significantly in a very rapid pace in their own information structure, and they require to retrieve various data from different computer systems. ISO 10303–STEP has been developed to provide a neutral format for exchanging product data. However, implementation of STEP has several issues, including the following two: (1) the complete STEP file should be processed even for querying a small set of data, and (2) information required for realizing any functional activity (e.g., any analysis on any part of a product) is not explicitly identified. Hence, in this study, functionality-based conformance classes (FCCs) are developed to organize the current conformance classes (CCs) (which are the classes required to be implemented fully in order to be conformant to any particu...
for serving as my committee members and providing valuable suggestions and comments for this diss... more for serving as my committee members and providing valuable suggestions and comments for this dissertation. A big "thank you" goes to Dr. Bicheng Zhu for all his help in fundamental research problem discussions, encouragement, and suggestions for life. Further thanks go to the lab colleagues and friends, including Omer Yaman, Yunpeng Li, Hang Yin, and Kai Sun, for their good suggestions in my research work. Special thanks go to Dr. Xianrui Wang and Dr. Xu Yan, for their friendship and support across the world. I also want to thank my friends Dr. Jing Wang, Zhengyi Song, and Daiyang Gao for their companionship in graduate school. Finally, I would like to acknowledge the most important persons in my life-my parents Zhijian Zhang and Huiying Jia for their unconditional love. Without their support, I could not overcome all the challenges I faced all these years. v
Journal of Computing and Information Science in Engineering
Disassembly, a process of separating the end of life (EOL) product into discrete components for r... more Disassembly, a process of separating the end of life (EOL) product into discrete components for re-utilizing their associated residual values, is an important enabler for the sustainable manufacturing. This work focuses on the modeling of the disassembly planning related information and develops a disassembly information model (DIM) based on an extensive investigation of various informational aspects in the domain of disassembly planning. The developed DIM, which represents an appropriate systematization and classification of the products, processes, uncertainties, and degradations related information, follows a layered modeling methodology in which DIM is subdivided into layers with the intent to separate general knowledge into different levels of abstractions and reach a balance between information reusability and information usability. Two prototype disassembly planning related applications have been incorporated to validate the usability and reusability of the developed DIM.
Journal of Computing and Information Science in Engineering
There is a dire need for the development of an integrated information model for organizing and ma... more There is a dire need for the development of an integrated information model for organizing and managing material and manufacturing related information, required for any product realization. In this paper, such an information framework for product, process, and material modeling has been proposed to support the product's form, function and behavior, its physical and functional decompositions, its design requirements and design rationale, and its material and process needs. A detailed, real-life case study of the waterjet intensifier design system has been presented to show how this proposed framework could support, capture, and utilize all necessary information required for the selection of the intensifier's high-pressure cylinder material. The framework will also be able to provide sufficient information to quantify the ecocompatibility of products.
The International Journal of Advanced Manufacturing Technology, 2015
ABSTRACT Disassembly, as one of the core steps in the end of life (EOL) activities, has been a po... more ABSTRACT Disassembly, as one of the core steps in the end of life (EOL) activities, has been a popular topic both in industrial and academic areas. Unlike assembly, any practical disassembly process planning, which is very important for material recycling or component reuse, is still a topic of active research. One major obstacle in developing an optimal disassembly process planning system is the uncertain characteristics of the EOL products (uncertain information), such as the quality and quantity of the components and parts, which normally make a deterministic disassembly process planning impossible. How to represent and further use such uncertain information in reasoning about a realistic optimal disassembly process sequence are the most important research issues. This paper addresses these issues by developing a disassembly information framework which consists of both an ontology-based information model (domain semantics and rules) and a computational model (process planning generation methodology). The explicit domain concepts, relationships, or rules developed in the ontology-based information enhance the process planning generation methodology (computational model) and thus make the planning process efficient and more realistic. Examples are used in the end to illustrate the use of the proposed framework and methodology.
ABSTRACT In this study, a functional and behavioral representation model for collaboration in pro... more ABSTRACT In this study, a functional and behavioral representation model for collaboration in product development is developed to represent assembly-related product knowledge, including its geometry, spatial relationships, function and behavior, which will be used to create a knowledge representation scheme to capture, store, and retrieve product knowledge. In this model, the function, behavior and artifact information is interrelated based on assembly associations. Functional and behavioral inputs and outputs are defined based on the spatial relationships in the assembly, as well as on the geometry of the product. The functional associations among artifacts define the “Behavior Model” with engineering formulas and physical rules. “Behavior Models” then define the behavior of the artifact. Behavior has four different forms for different phases in life cycle: (1) Intended Behavior in the conceptual design phase, (2) Estimated Behavior in the design phase, (3) Observed Behavior in the operation stage, and (4) Evaluated Behavior in the design and operation phases. When an unintended event (behavior) occurs, an additional function can be added to eliminate that effect. As a result, the functional and behavioral model is updated dynamically.
Robotics and Computer-Integrated Manufacturing, 1988
Presently available CAD data models have no problem handling the basic shape design of an object ... more Presently available CAD data models have no problem handling the basic shape design of an object as required but they are not properly manufacturing-oriented. It is not possible to represent the dimensioning and tolerancing information or other technological information (such as material data, the surface roughness and accuracy data, feature information, etc.). This paper discusses the requirements of a new CAD data model and proposes a feature-based representation scheme based on the hybrid CSG/B-Rep data structure. This hybrid structure exploits the advantages of both CSG and B-Rep models in representing tolerance information. A relational graph structure (face-based data model of B-Rep) of the object is maintained at each hierarchical level of object construction for associating tolerance and other attributes. 2. REVIEW OF RELEVANT WORK Solid modeler based investigation of D&T representational issues was initiated by Requlcha 13' 14 of the Production Automation Project, University of
This paper identifies some of the problems and ambiguities with existing standards for establishi... more This paper identifies some of the problems and ambiguities with existing standards for establishing datums in manufactured components. Most of the criteria as described in the standards do not uniquely define the datums from measured data points of manufactured features. Three ...
Journal of Manufacturing Science and Engineering, 2002
Stability analysis plays a critical role in determining the applicability of a fixture design. Th... more Stability analysis plays a critical role in determining the applicability of a fixture design. This paper reports the development of a computational methodology for quantitatively analyzing the workpiece’s stability in the automated fixture design (AFD) environment. In stability analysis, the virtual disturbance which is expressed as a wrench in the screw coordinates and has the same tendency as those fixturing and machining forces to destabilize the workpiece is adopted in the study, and the stability of the workpiece is characterized based on its capability to overcome the virtual disturbance. The stability characteristics for each fixturing configuration (i.e., positions for fixturing components of supporters, locators and clamps) itself are obtained from the stability analysis and used in the re-design process to determine the better design of fixturing configuration.
AbstractIn this paper, a product life cycle design template used to assist in the development of ... more AbstractIn this paper, a product life cycle design template used to assist in the development of a product knowledge base is introduced. The paper argues that following this model should result in a focus on real-world product behavior beyond the expected product performance by directing the questions from what should happen when the products interact in the universe to what can happen at each design juncture. The template may be simply used as a thought process with a pad and pencil for recording notes for simple or on-the-fly design decisions. The idea of using the templates as a tool could be more formalized for larger designs and knowledge-base development. In this paper, the concept has been demonstrated in building the knowledge base for the geosolar exergy storage technology (GEST) house.
Establishing an "intelligent link" between conventional CAD systems and different analy... more Establishing an "intelligent link" between conventional CAD systems and different analytical tools like finite element analysis packages is a significant concern in design automation. This paper proposes the use of knowledge engineering for the unification process and outlines the dimensions of an overall framework for an integrated CAD/FEM system A prototype system for structural design of aircraft wings has been implemented in this integrated environment.
Neural network model for selecting machining parameters in fixture design. Utpal Roy, Jianmin Lia... more Neural network model for selecting machining parameters in fixture design. Utpal Roy, Jianmin Liao Integrated Computer-Aided Engineering 3:33, 149-157, 1996. This paper describes the training and implementation of an artificial ...
A critical challenge to Engineer-To-Order (ETO) manufacturing firms is the long lead time in prod... more A critical challenge to Engineer-To-Order (ETO) manufacturing firms is the long lead time in product development, due to the nature of highly customized products produced in low volume. The emergent Data-Driven Design (D 3) approach is a possible solution to alleviate this tension by utilizing rich product-related data throughout the product's lifecycle and building reusable data analytics models, in order for more accurate lead time estimate in a continuously updated way. In this paper, we propose a product lifecycle management (PLM) based framework to enable Prescriptive Analytics capability in ETO companies to improve their lead time estimate. The PLM has been extended to support data analytics model lifecycle management by incorporating a formal data analytics process model, CRISP-DM. It also implements a model-based approach for optimization model development, management, and execution. The proposed PLM-based Predictive Analytics framework has been applied in a local ETO manufacturing company for testing and validation.
Journal of Computing and Information Science in Engineering
Information exchange and sharing become a necessity for digital factory but they have been more c... more Information exchange and sharing become a necessity for digital factory but they have been more challenging as the industry is computerized more. This is mainly because the capabilities of computerized systems have grown significantly in a very rapid pace in their own information structure, and they require to retrieve various data from different computer systems. ISO 10303–STEP has been developed to provide a neutral format for exchanging product data. However, implementation of STEP has several issues, including the following two: (1) the complete STEP file should be processed even for querying a small set of data, and (2) information required for realizing any functional activity (e.g., any analysis on any part of a product) is not explicitly identified. Hence, in this study, functionality-based conformance classes (FCCs) are developed to organize the current conformance classes (CCs) (which are the classes required to be implemented fully in order to be conformant to any particu...
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Papers by Utpal Roy