Topic
Material flow
About: Material flow is a research topic. Over the lifetime, 3050 publications have been published within this topic receiving 36844 citations. The topic is also known as: material stream.
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07 May 2007
TL;DR: This article estimated the material flow of used PCs in Japan, both before and after the enforcement of a household PC recycling system, by minimizing the errors in material flow data, and estimated the number of PCs reused in the country and the number exported as secondhand.
Abstract: We estimated the material flow of used PCs in Japan, both before and after the enforcement of a household PC recycling system, by minimizing the errors in material flow data. The number of PCs reused in the country and the number exported as secondhand were also estimated.
15 citations
TL;DR: In this article, the performance of a polymer electrolyte membrane fuel cell with porous foam flow channel is analyzed under static and transient conditions, and a mathematical model that takes into account the effect of pressure drop in the flow channel and compares the dynamics of a porous flow channel with those of the traditional serpentine flow channel.
15 citations
TL;DR: In this article, a hot closed-die forging process is analyzed by physical modeling and by isothermal and non-isothermal numerical modeling with the finite-element method, especially in respect of the material flow, the die pressure, and the temperature.
15 citations
TL;DR: A robust machine layout design tool that minimises the material flow distance using a Genetic Algorithm (GA), taking into account demand uncertainty and machine maintenance is presented.
Abstract: The layout of manufacturing facilities has a large impact on manufacturing performance. The layout design process produces a block plan that shows the relative positioning of resources that can be developed into a detailed layout drawing. The total material handling distance is commonly used for measuring material flow. Manufacturing systems are subject to external and internal uncertainties including demand and machine breakdowns. Uncertainty and the rerouting of material flows have an impact on the material handling distance. No previous research has integrated robust machine layout design through multiple periods of dynamic demand with machine maintenance planning. This paper presents a robust machine layout design tool that minimises the material flow distance using a Genetic Algorithm (GA), taking into account demand uncertainty and machine maintenance. Experiments were conducted using eleven benchmark datasets that considered three scenarios: preventive maintenance (PM), corrective maintenance (CM) and both PM and CM. The results were analysed statistically. The effect of several maintenance scenarios including the ratio of the number of machines with period-based PM (PPM) to the number with production quantity-based PM (QPM), the percentage of machines with CM (%CM), and a combination of PMM/QPM ratios and %CM on material flow distance were examined. The results show that designing robust layouts considering maintenance resulted in shorter material flow distances. The distance was decreased by 30.91%, 9.8%, and 20.7% for the PM, CM, and both PM/CM scenarios, respectively. The PPM/QPM ratios, %CM, and a combination of PPM/QPM and %CM had significantly resulted in the material flow distance on almost all datasets.
15 citations
01 Jan 2012
TL;DR: The requirements on the virtual commissioning are a strongly time-deterministic computation in the range of one millisecond, robust and efficient computing algorithms and system-dynamic features, and both simulation models are validated against a real conveyor belt.
Abstract: In this paper a multi-scale simulation approach based on system dynamics is investigated that is divided into a microscopic and a macroscopic model scale. On the microscopic model scale small amounts of parts are simulated, whereby the motion of each single discrete element is explicitly realized by means of a physically-based simulation. On the macroscopic model scale, based on a two-dimensional hyperbolic partial differential equation (PDE), a simulation of the material flow with a large amount of parts is realized. We explicitly examine the requirements on the virtual commissioning, which are a strongly time-deterministic computation in the range of one millisecond, robust and efficient computing algorithms and system-dynamic features. Both simulation models are validated against a real conveyor belt.
15 citations