Agent-based material transportation scheduling of AGV systems and its manufacturing applications

制度:新 ; 報告番号:甲3743号 ; 学位の種類:博士(工学) ; 授与年月日:2012/9/10 ; 早大学位記番号:新6114Waseda Universit

Makespan Minimization of Machines and Automated Guided Vehicles Schedule Using Binary Particle Swarm Optimization

An efficient and optimized Automated Guided Vehicles (AGVs) operation plays a critical role in improving the performance of a Flexible Manufacturing System (FMS). Among the main elements in the implementation of AGV is task scheduling. This is due to the fact that efficient scheduling would enable the increment of productivity and reducing delivery cost whilst optimally utilizes the entire fleet. In this research, Binary Particle Swarm Optimization (BPSO) is used to optimize simultaneous machines and AGVs scheduling process with makespan minimization function. It is proven that the method is capable to provide better solution compared to others

A Mobile Application Architecture for Measuring Shaft Misalignment

Shaft alignment task is one of the important issues in manufacturing maintenance particularly to personnel who daily facing misalignment problem. The importance increase as shaft alignment needs high accuracy and precise measurement will reduces bearing and seal damage, minimizes energy loss, and reduces production downtime. Thus, in this paper we present an architecture in developing mobile application for shaft alignment that could saves the user the arduous task of using dial gauges. The aim is to solve engineering maintenance problem that runs on a Personal Digital Assistant (PDA) and brings the solution straight to the user’s fingertips. This would shorten processing time, provide reliable and better accuracy analysis and as a medium for data sharing thus increase communication level within a manufacturing plant

Manufacturing Sustainability Via OEE Measures: A Conceptual Model

This paper proposes a conceptual model on the achieving of the manufacturing sustainability through an established performance measure so called Overall Equipment Effectiveness (OEE) based on literature study. It examines the measures of overall equipment effectiveness that consist of contributing factors, availability, performance, and quality; and the sustainable manufacturing components including environmental conservation, social efficiency, and economic vitality. The measures of the OEE are required some modification to enhance the accomplishment of the sustainability in manufacturing. Besides, the measures are nevertheless possible to improve productivity through the identification and elimination of manufacturing big loses. It can be used as an initial reference for manufacturers to consider overall equipment effectiveness to advance the goal of manufacturing sustainability

A review of user-centred design methods for designing a portable oil spill skimmer

Boom and skimmer are mechanical techniques in Oil Spill Response and Recovery (OSRR) that collect oil from the water surface. However, there are several drawbacks of using boom and skimmer, such as the oil could pass over the boom during strong wind and high tides. Moreover, the currently available oil skimmer designed by the engineers is heavy-duty; in consequence, it is ineffective in shallow water. Thus, there is a need to develop a portable oil spill skimmer to complement the current drawbacks. Several journals on the fabrication of the oil spill skimmer were reviewed. Findings from literature shows that the development of oil spill skimmer lacks user requirements when designing a portable oil spill skimmer. This article provides a systematic review of Kansei Engineering and the Analytical Hierarchy Process in the product development process. Therefore, Kansei Engineering and Analytical Hierarchy Process (AHP) can be incorporated in the early stage of designing a portable oil spill skimmer. This paper also includes the application of Kansei Engineering and AHP in design research articles. Findings from observed articles indicate a lack of design and development technologies relating to products for environmental protection; the AHP and Kansei Engineering application is somewhat lacking. Moreover, the fabrication of an oil spill skimmer focuses more on technical specifications and includes fewer user requirements. As a result, the characteristics such as ease of use, robustness, and safety cannot be evaluated. The AHP and Kansei Engineering methodology can be extended to the design and manufacture of products for environmental protection

Fusion of Fuzzy AHP in selecting material for drinking water bottle based on customer needs

In this paper, selection of drinking water bottle material is to be selected. Therefore, to try out decision making tools efficiency, three methods have been used. The methods are fusion of Analytic Hierarchy Process (AHP) with Fuzzy logic with different membership function. The material selected are silicone, polypropylene, HDPE, LDPE and Tin. The criterion that being taken into consideration are price, density, tensile strength, thermal conductivity and electrical resistivity. Three methods have been carried out, and the weightage compared in the form of line graph. The best material gave by traditional AHP and trapezoidal AHP are Polypropylene, however triangular AHP gave LDPE is the best. But all three methods shows that tin is the least desirable when it does not satisfy all criterions

The Potential Of Oee Measure For Sustainable Environment In Palm Oil Mill: A Review

The purposes of this paper are to review and explore the potential of overall equipment effectiveness (also known as OEE) measures on environmental sustainability in palm oil mill operation. Literature review on OEE and current sustainable palm oil mill research, and semi-structured interview on relevant persons on the business nature have been conducted to achieve the determined objectives. The result is presented in a conceptual model to show the potential relationship between the three stated keywords. The model shows that OEE measure initially has positive influenced on environmental sustainability development in palm oil mill especially for reduction of greenhouse gasses emissions, utilisation of raw material, pollution control of soil, air, and water, and utilisation of natural resources. The findings also can be used to understand the effect of OEE measures on the realization of sustainable environment in the palm oil mill

E-RECYCLING SYSTEM MODEL AND ITS APPLICATIONS TO PLASTIC, PAPER AND DISC

Lately, Malaysians tend to generate wastes at an alarming rate, for instance; discs, paper and plastics. Abreast of that, the conventional recycling systems that have been constructed in Malaysia typically are not widely marketed and are lacking of practical applications. This study comes with an intention of concentrating on the improvement of this particular conventional renewed Erecycling system model that includes database system (generally known as Merit Point Incentive (MPI) system) and CAD model. Due to its applicability, the model is examined by Linear Static and Fatigue analyses. The comparison (cost efficiency) amongst the conventional and E- recycling systems are shown throughout this study

Two-level factorial design of the pre-processing activities of polyamide 12 powder in selective laser sintering three-dimensional printing process

Powder exposure during selective laser sintering (SLS) three-dimensional (3D) printing process is detrimental to the health of workers in the indoor workspace and those in surrounding areas. To date, there is a paucity of studies concerning the factors involved in the SLS 3D printing process that have a significant effect on the indoor air concentrations. Hence, in this study, two-level factorial design was conducted to identify the factors that have a significant effect on the indoor air concentrations (particulate matter with a diameter less than 2.5 and 10.0 μm (PM2.5 and PM10), ultrafine particles (UFP), and total volatile organic compounds (TVOC)) during pre - processing activities of the SLS 3D printing process. The exposure during handling of polyamide 12 (PA12) was simulated in a 24-m2 SLS 3D printing chamber. The following factors were investigated: (1) Factor A (air velocity (fan speed of the split air conditioner), (2) Factor B (refresh rate (the use of recycled PA12 powder), (3) Factor C (collecting powder from the mixing machine), (4) Factor D (transferring powder to the SLS 3D printing machine), and (5) Factor E (pouring powder into the feeder chamber). The sampling methods were conducted according to the Industry Code of Practice on Indoor Air Quality, Department of Occupational Safety and Health, Malaysia. Based on the analysis of variance results, Factor B was the most significant factor that contributed to the PM2.5, PM10, UFP, and TVOC concentrations during the pre-processing activities of the SLS 3D printing process. In conclusion, proper handling and the use of an automated vacuum conveying technology for the pre-processing activities will help prevent the spreading of gaseous and aerosol particles to other areas within vicinity of the SLS 3D printing process

Emission Of Selected Environmental Exposure From Selective Laser Sintering (SLS) Polyamide Nylon (PA12) 3D Printing Process

Indoor Air Quality (IAQ) is very important to the health and comfort of occupants inside building. The quality of indoor air depends on the air pollutant inside the building. A bad IAQ in workplace will lead to negative impacts to the operators such as dizziness, irritation, headache and others. Additive manufacturing is one of the emerging technologies that has been discussed recently. However, the study on emission from 3D printing process are still focusedon FDM type 3D printer. Less attention given to the other type of 3D printing especially powder bed fusion particularly selective laser sintering (SLS). Therefore, this study aims to investigates the emission from selective laser sintering of 3D printing process. The design calibration block from SLS printer’s manufacturer is selected to be printed to measure the emission from SLS printing. The powder material use in this research was polyamide nylon (PA12) powder material. The data collected for 8 hours during whole printing process. Temperature, relative humidity, carbon dioxide (CO2), total volatile organic compound (TVOC), and formaldehyde were measured and compared to the acceptable limit for Industrial Code of Practice (ICOP) DOSH 2010. The highest concentration of carbon dioxide CO2 is at preparation for during printing phase 999 ppm and almost exceed the limit of 1000 ppm. Meanwhile, TVOC, formaldehyde, RH and temperature were measured at 1.7 ppm, 0.05 ppm, 70.6%, and 27.6 °C accordingly. The concentration of TVOC and formaldehyde are in the range of acceptable limit. RH and temperature meanwhile slightly over acceptable limit during SLS machine operation due to laser temperature. The data collected from the emissions of selective laser sintering (SLS) 3D printing by polyamide nylon powder suggest that ventilation system of the location should be improved to remove excess pollutant air and fresh air is suggest to supply constantly to the occupant