| Project/Area Number |
16560716
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Recycling engineering
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| Research Institution | The University of Shiga Prefecture |
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Principal Investigator |
OKUMURA Susumu University of Shiga Prefecture, Department of Mechanical Systems Engineering, Professor, 工学部, 教授 (70204146)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Eco-Design / Long Life Design / Reuse / Physical Life / Functional Life / Remanufacturing / 長寿命設計 |
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| Research Abstract |
Remanufacturing is a new trend in the field of environmentally friendly products toward eco-design. A product undergoes functional failure or physical failure in a remanufacturing environment. A unit intended for reuse should be designed to be durable for a period equal to at least two functional lives through remanufacturing. Usage of excess materials can improve the strength of a reusable unit and give more than two physical lives ; however, such a method may increase the environmental impact due to the obsolescence of the reusable unit, which is an important factor to consider. This study aims to construct a mathematical model, which enables to evaluate environmental impact, and derive the optimal physical lifespan distribution of a reusable unit. In the first year, a mathematical model of a remanufacturing system has been constructed considering physical and functional failures. The incurred total environmental impact per unit time for a reusable unit is formulated as a minimization problem, by which the optimal design parameters of a reusable unit and the maximum number of times of reuse have been determined. In the second year, a mathematical model with consideration of the time series behavior of the value and demand of reusable units and sustainable products including reusable units has been developed. A discrete-event simulation model has been made for its purpose and statistical characteristics of the optimal physical life span distribution have been derived under various environmental conditions. In the last year, a method for setting the optimal physical life span of a reusable part has been proposed on the basis of the result obtained with life cycle simulation of environmentally-conscious products circulation and a nonlinear mathematical programming problem. The effectiveness of the proposed method has been examined by some numerical examples of actual mechanical element examples.
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