The Experts below are selected from a list of 5616 Experts worldwide ranked by ideXlab platform
Kazuhiro Saitou - One of the best experts on this subject based on the ideXlab platform.
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High-Stiffness, Lock-and-Key Heat-Reversible Locator-Snap Systems for the Design for Disassembly
Journal of Mechanical Design, 2009Co-Authors: Mohammed Shalaby, Kazuhiro SaitouAbstract:Driven by the moral sense of obligation, legislative and social pressures, manufacturers now consider effective part reuse and material recycling at the end of product life at the Design stage. It is a key consideration to use joints that can disengage with minimum labor, part damage, and material contamination. This paper extends our previous work on the Design of high-stiffness reversible locator-snap system that can disengage nonde-structively with localized heat (Shalaby and Saitou, 2006, "Optimal Heat-Reversible Snap Joints for Frame-Panel Assembly in Aluminum Space Frame Automotive Bodies," Proceedings of the LCE2006: The 13th CIRP International Conference on Life Cycle Engineering, Leuven, Belgium, May 31-Jun. 2, pp. 411-416; Shalaby and Saitou, 2008, "Design for Disassembly With High-Stiffness, Heat-Reversible Locator-Snap Systems," ASME J. Mech. Des., 130(12), p. 121701) to include (1) modeling for tolerance stack-up and (2) lock-and-key concept to ensure that snaps only disengage when the right procedure is followed. The Design problem is posed as an optimization problem to find the locations, numbers, and orientations of locators and snaps, and the locations and sizes of heating areas, to release the snaps with minimum heat, compliance, and tolerance stack-up. The motion and structural requirements are considered constraints. Screw theory is employed to precalculate the set of feasible types and orientations of locators and snaps that are examined during optimization. Multi-objective genetic algorithm coupled with structural and thermal finite element analysis is used to solve the optimization problem. The method is applied on two case studies. The Pareto-optimal solutions present alternative Designs with different trade-offs between the Design objectives.
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Design for Disassembly with high stiffness heat reversible locator snap systems
Journal of Mechanical Design, 2008Co-Authors: Mohammed Shalaby, Kazuhiro SaitouAbstract:Recent legislative and social pressures have driven manufacturers to consider effective part reuse and material recycling at the end of product life at the Design stage. One of the key considerations is to Design and use joints that can disengage with minimum labor, part damage, and material contamination. This paper presents a unified method to Design a high-stiffness reversible locator-snap system that can disengage nondestructively with localized heat, and its application to external product enclosures of electrical appliances. The Design problem is posed as an optimization problem to find the locations, numbers, and orientations of locators and snaps as well as the number, locations, and sizes of heating areas, which realize the release of snaps with minimum heating area and maximum stiffness while satisfying any motion and structural requirements. The screw theory is utilized to precalculate a set of feasible orientations of locators and snaps, which are examined during optimization. The optimization problem is solved using the multi-objective genetic algorithm coupled with the structural and thermal finite element analysis. The method is applied to a two-piece enclosure of a DVD player with a T-shaped mating line. The resulting Pareto-optimal solutions exhibit alternative Designs with different trade-offs between the structural stiffness during snap engagement and the area of heating for snap disengagement. Some results require the heating of two areas at the same time, demonstrating the idea of a lock-and-key.
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Design for Disassembly with high stiffness heat reversible locator snap systems
Volume 4: ASME IEEE International Conference on Mechatronic and Embedded Systems and Applications and the 19th Reliability Stress Analysis and Failure, 2007Co-Authors: Mohammed Shalaby, Kazuhiro SaitouAbstract:Recent legislative and social pressures have driven manufacturers to consider effective part reuse and material recycling at the end of product life at the Design stage. One of the key considerations is to Design and use joints that can disengage with minimum labor, part damage, and material contamination. This paper presents a unified method to Design high-stiffness reversible locator-snap system that can disengage non-destructively with localized heat, and its application to external product enclosures of electrical appliances. The Design problem is posed as an optimization problem to find the orientations, numbers, and locations of locators and snaps, and the number, locations and sizes of heating areas, which realize the release of snaps with minimum heating area and maximum stiffness, while satisfying any motion and structural requirements. Screw Theory is utilized to pre-calculate a set of feasible orientations of locators and snaps, which are examined during optimization. The optimization problem is solved using Multi Objective Genetic Algorithm (MOGA) coupled with structural and thermal FEA. The method is applied to two-piece enclosure of a DVD player with a T-shaped mating line. The resulting Pareto-optimal solutions exhibit alternative Designs with different trade-offs between structural stiffness during snap engagement and area of heating for snap disengagement. Some results require the heating of two areas at the same time, demonstrating the idea of a lock-n-key.Copyright © 2007 by ASME
Philip Crowther - One of the best experts on this subject based on the ideXlab platform.
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Re-valuing construction materials and components through Design for Disassembly
Unmaking Waste in Production and Consumption: Towards the Circular Economy, 2018Co-Authors: Philip CrowtherAbstract:The expected operational lifespan of modern buildings has become disturbingly short as buildings are replaced for reasons of changing cultural expectations, style, serviceability, locational obsolescence and economic viability. The same buildings, however, are not always physically or structurally obsolete; the materials and components within them are very often still serviceable. While there is some recycling of selected construction materials, such as steel and concrete, this is almost always in the form of down cycling or reprocessing. One significant impediment to reuse is that buildings are not Designed in a way that facilitates easy recovery of materials and components. This chapter explores the potential for the recovery of materials and components if buildings were Designed for such future recovery, utilizing the strategy of Design for Disassembly. As well as assessing material waste, this chapter presents research into the analysis of the embodied energy in buildings, highlighting its significance in comparison with operational energy. Analysis at material, component and whole of- building levels shows the potential benefits of strategically Designing buildings for future Disassembly to recover this embodied energy. Careful consideration at the early Design stage can result in the deconstruction of significant portions of buildings and the recovery of their potential through higher order reuse and upcycling.
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Morphological analysis of the city for achieving Design for Disassembly
The Sustainable City XI, 2016Co-Authors: Philip CrowtherAbstract:While it is dangerously tempting to think of the city as a fixed built environment, the result of careful planning and Design, it is in fact an ever changing system of infrastructures, buildings, spaces and materials. The commercial and social pressures of modern society demand constant newness and change. Unfortunately most of our cities are not Designed or built to accommodate ease of change through Disassembly; rather they succumb to demolition and the creation of waste. A strategy of Design for Disassembly has been successfully implemented in many mass produced products such as computers and cars, but it has not achieved popular or widespread application in the Design and construction of cities. This paper presents a theoretical model for understanding the potential for Design for Disassembly in the city in order to reduce waste and increase reuse. It explores multiple scales of the city from materials and elements, through rooms and buildings, to urban form and territories. The paper draws on a typo-morphological analysis of the city through the theories developed by both the Italian and British schools of urban morphologists. It establishes a structure of time-related layers of the city and proposes ways to interact with those layers in a sustainable and systemic way. A morphological analysis of elements, structures, systems and organisms, is applied to a number of case study buildings and city territories in order to assess their Disassembly potential, and through analysis, develop principles of Design for Disassembly that operate at a whole of city scale.
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Re-valuing construction materials and components through Design for Disassembly
2015Co-Authors: Philip CrowtherAbstract:The construction industry accounts for a significant portion of the material consumption of our industrialised societies. That material consumption comes at an environmental cost, and when buildings and infrastructure projects are demolished and discarded, after their useful lifespan, that environmental cost remains largely unrecovered. The expected operational lifespan of modern buildings has become disturbingly short as buildings are replaced for reasons of changing cultural expectations, style, serviceability, locational obsolescence and economic viability. The same buildings however are not always physically or structurally obsolete; the materials and components within them are very often still completely serviceable. While there is some activity in the area of recycling of selected construction materials, such as steel and concrete, this is almost always in the form of down cycling or reprocessing. Very little of this material and component resource is reuse in a way that more effectively captures its potential. One significant impediment to such reuse is that buildings are not Designed in a way that facilitates easy recovery of materials and components; they are Designed and built for speed of construction and quick economic returns, with little or no consideration of the longer term consequences of their physical matter. This research project explores the potential for the recovery of materials and components if buildings were Designed for such future recovery; a strategy of Design for Disassembly. This is not a new Design philosophy; Design for Disassembly is well understood in product Design and industrial Design. There are also some architectural examples of Design for Disassembly; however these are specialist examples and there is no significant attempt to implement the strategy in the main stream construction industry. This paper presents research into the analysis of the embodied energy in buildings, highlighting its significance in comparison with operational energy. Analysis at material, component, and whole-of-building levels shows the potential benefits of strategically Designing buildings for future Disassembly to recover this embodied energy. Careful consideration at the early Design stage can result in the deconstruction of significant portions of buildings and the recovery of their potential through higher order reuse and upcycling.
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Investigating Design for Disassembly through creative practice
2014Co-Authors: Philip CrowtherAbstract:The construction industry is responsible for a significant part of the solid waste that industrialised nations dispose of each year. One reason for this is the inability to easily separate materials and components from each other and from the building structure. If buildings were Designed for Disassembly in the first instance, then future material and component recovery would be easier. This paper presents a number of principles for Design for Disassembly that have been tested and developed through a process of research through creative practice. A number of architectural Designs have been used to trial the principles in practice.
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Design for Disassembly
1999Co-Authors: Philip CrowtherAbstract:One of the main obstacles to building material reuse is the difficulty in separating materials and components from the building. Design for Disassembly is a useful strategy that can be applied to varying extents to increase the future rates of material and component reuse. Buildings have been Designed for Disassembly in the past and there are valuable lessons to be learned from those examples.
Mohammed Shalaby - One of the best experts on this subject based on the ideXlab platform.
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High-Stiffness, Lock-and-Key Heat-Reversible Locator-Snap Systems for the Design for Disassembly
Journal of Mechanical Design, 2009Co-Authors: Mohammed Shalaby, Kazuhiro SaitouAbstract:Driven by the moral sense of obligation, legislative and social pressures, manufacturers now consider effective part reuse and material recycling at the end of product life at the Design stage. It is a key consideration to use joints that can disengage with minimum labor, part damage, and material contamination. This paper extends our previous work on the Design of high-stiffness reversible locator-snap system that can disengage nonde-structively with localized heat (Shalaby and Saitou, 2006, "Optimal Heat-Reversible Snap Joints for Frame-Panel Assembly in Aluminum Space Frame Automotive Bodies," Proceedings of the LCE2006: The 13th CIRP International Conference on Life Cycle Engineering, Leuven, Belgium, May 31-Jun. 2, pp. 411-416; Shalaby and Saitou, 2008, "Design for Disassembly With High-Stiffness, Heat-Reversible Locator-Snap Systems," ASME J. Mech. Des., 130(12), p. 121701) to include (1) modeling for tolerance stack-up and (2) lock-and-key concept to ensure that snaps only disengage when the right procedure is followed. The Design problem is posed as an optimization problem to find the locations, numbers, and orientations of locators and snaps, and the locations and sizes of heating areas, to release the snaps with minimum heat, compliance, and tolerance stack-up. The motion and structural requirements are considered constraints. Screw theory is employed to precalculate the set of feasible types and orientations of locators and snaps that are examined during optimization. Multi-objective genetic algorithm coupled with structural and thermal finite element analysis is used to solve the optimization problem. The method is applied on two case studies. The Pareto-optimal solutions present alternative Designs with different trade-offs between the Design objectives.
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Design for Disassembly with high stiffness heat reversible locator snap systems
Journal of Mechanical Design, 2008Co-Authors: Mohammed Shalaby, Kazuhiro SaitouAbstract:Recent legislative and social pressures have driven manufacturers to consider effective part reuse and material recycling at the end of product life at the Design stage. One of the key considerations is to Design and use joints that can disengage with minimum labor, part damage, and material contamination. This paper presents a unified method to Design a high-stiffness reversible locator-snap system that can disengage nondestructively with localized heat, and its application to external product enclosures of electrical appliances. The Design problem is posed as an optimization problem to find the locations, numbers, and orientations of locators and snaps as well as the number, locations, and sizes of heating areas, which realize the release of snaps with minimum heating area and maximum stiffness while satisfying any motion and structural requirements. The screw theory is utilized to precalculate a set of feasible orientations of locators and snaps, which are examined during optimization. The optimization problem is solved using the multi-objective genetic algorithm coupled with the structural and thermal finite element analysis. The method is applied to a two-piece enclosure of a DVD player with a T-shaped mating line. The resulting Pareto-optimal solutions exhibit alternative Designs with different trade-offs between the structural stiffness during snap engagement and the area of heating for snap disengagement. Some results require the heating of two areas at the same time, demonstrating the idea of a lock-and-key.
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Design for Disassembly with high stiffness heat reversible locator snap systems
Volume 4: ASME IEEE International Conference on Mechatronic and Embedded Systems and Applications and the 19th Reliability Stress Analysis and Failure, 2007Co-Authors: Mohammed Shalaby, Kazuhiro SaitouAbstract:Recent legislative and social pressures have driven manufacturers to consider effective part reuse and material recycling at the end of product life at the Design stage. One of the key considerations is to Design and use joints that can disengage with minimum labor, part damage, and material contamination. This paper presents a unified method to Design high-stiffness reversible locator-snap system that can disengage non-destructively with localized heat, and its application to external product enclosures of electrical appliances. The Design problem is posed as an optimization problem to find the orientations, numbers, and locations of locators and snaps, and the number, locations and sizes of heating areas, which realize the release of snaps with minimum heating area and maximum stiffness, while satisfying any motion and structural requirements. Screw Theory is utilized to pre-calculate a set of feasible orientations of locators and snaps, which are examined during optimization. The optimization problem is solved using Multi Objective Genetic Algorithm (MOGA) coupled with structural and thermal FEA. The method is applied to two-piece enclosure of a DVD player with a T-shaped mating line. The resulting Pareto-optimal solutions exhibit alternative Designs with different trade-offs between structural stiffness during snap engagement and area of heating for snap disengagement. Some results require the heating of two areas at the same time, demonstrating the idea of a lock-n-key.Copyright © 2007 by ASME
David W. Rosen - One of the best experts on this subject based on the ideXlab platform.
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Virtual prototyping in simultaneous product/process Design for Disassembly
Rapid Response Manufacturing, 1998Co-Authors: Matthew D. Bauer, Zahed Siddique, David W. RosenAbstract:Designers are being called on to Design higher-quality products, to consider additional life cycle concerns, and do this more rapidly with fewer resources. Our approach to rapid product development centers on two main ideas: an intelligent partition of responsibilities between Designer and computer based on their abilities and capabilities; and an integrated decision support environment in which all the Design requirements can be considered simultaneously. We illustrate the application of these ideas to product Design for Disassembly through our approach to virtual prototyping and the formulation and solution of simultaneous product and Disassembly process Design problems.
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virtual prototyping in simultaneous product process Design for Disassembly
1998Co-Authors: Matthew D. Bauer, Zahed Siddique, David W. RosenAbstract:Designers are being called on to Design higher-quality products, to consider additional life cycle concerns, and do this more rapidly with fewer resources. Our approach to rapid product development centers on two main ideas: an intelligent partition of responsibilities between Designer and computer based on their abilities and capabilities; and an integrated decision support environment in which all the Design requirements can be considered simultaneously. We illustrate the application of these ideas to product Design for Disassembly through our approach to virtual prototyping and the formulation and solution of simultaneous product and Disassembly process Design problems.
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Simultaneous product/process Design for Disassembly
1997Co-Authors: Matthew D. Bauer, David W. RosenAbstract:The research reported in this paper illustrates the integration of product and Disassembly process Design via virtual prototyping. In this context, a virtual prototype is an information model consisting of a product model and one or more process models. Integrated product/process Design is accomplished by defining a parametric Design problem in terms of constraints/goals and coupling virtual prototypes and a multiobjective optimization code for solution. Application of optimization techniques to solution has proven difficult Problematic characteristics are highlighted, and an effective optimization algorithm is described. An automotive center console is used as an example. The focus of this paper is the formulation and solution of integrated product/process Design problems, rather than the results of the center console Design problem, per se.
Anil Mital - One of the best experts on this subject based on the ideXlab platform.
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An interactive system framework to enable Design for Disassembly
Journal of Manufacturing Technology Management, 2017Co-Authors: Anoop Desai, Anil MitalAbstract:Purpose The purpose of this paper is to present an interactive system to enable product Design for Disassembly and to offer robust and quick Design solutions based on Designers’ input. Design/methodology/approach The system utilizes an interactive questionnaire to communicate with the Designer. The questionnaire is in the form of binary questions (Yes/No) and Design questions that would enable the system to learn the objectives of the Design. Solutions are based on a CAD supported Design platform. The efficiency of each Design is calculated using Disassembly time as the metric of measurement using motion-time measurement (MTM). The Designer would be able to make an informed decision with respect to component functionality, ease of Disassembly and Disassembly time. The paper presents a detailed framework and structure of this system. Findings The value of the system is corroborated by means of a case study of an actual product Design. The system is structured to offer multiple solutions to a Design problem so as to enable the Designer to choose the option that best serves their needs. Originality/value This novel interactive system would accept customers’ Design preferences as input and offer multiple solutions in order to solve the Design problem. Process time is directly calculated using the MTM system of measurement by converting Design features into time measurement units. Disassembly time can then be easily converted into Disassembly cost by using standard conversion rates. The value to Designers is obvious.
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Incorporating work factors in Design for Disassembly in product Design
Journal of Manufacturing Technology Management, 2005Co-Authors: Anoop Desai, Anil MitalAbstract:Purpose – This paper seeks to present a methodology to Design products for Disassembly. This would facilitate end‐of‐life product Disassembly with a view to maximizing material usage in the supply chain at a low cost to the environment.Design/methodology/approach – The methodology presented in the paper draws on fundamentals related to task analysis and motion time measurement. The methodology was practically applied to disassemble several different consumer products with significant savings in time.Findings – Several improvements in product Design resulted from various perspectives including functionality, assembly, aesthetics and Disassembly.Research limitations/implications – The paper identifies several areas of future research including Design optimization and Designing work fixtures for Disassembly.Originality/value – This work presents in part an improvement in current methodologies related to Disassembly as well as original work based on task analysis and suggestion of Design alternatives. The pap...
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evaluation of disassemblability to enable Design for Disassembly in mass production
International Journal of Industrial Ergonomics, 2003Co-Authors: Anoop Desai, Anil MitalAbstract:Abstract A comprehensive methodology to enhance disassemblability of products has been presented in this paper. Disassemblability of a product is a function of several parameters such as exertion of manual force for Disassembly, degree of precision required for effective tool placement, weight, size, material and shape of components being disassembled, use of hand tools, etc. The study of relevant literature indicates the presence of Disassembly evaluation criteria and methodologies that address the problem partially such as Disassembly sequence planning or economic analysis. As far as Design for Disassembly is concerned, there is a plethora of literature on rules to improve recycling end-of-life components. A systematic methodology to incorporate Disassembly considerations in product Design and enable quantitative evaluation of the Design is absent. The current methodology assigns time-based numeric indices to each Design factor, which make for easy and quick determination of Disassembly time. A higher score indicates anomalies in product Design from the Disassembly perspective. Addressing these anomalies can result in significant Design modifications rendering an overall increase in disassemblability of the product. Decisions regarding Design modifications are based on weighing several factors such as technical and economic feasibility, overall functionality and structural rigidity of the product as a whole. Relevance to industry A comprehensive Design for Disassembly methodology is developed which is intended to act as a tool in life cycle engineering.