Influence of the Number of AGVs on Products Conveyance Efficiency in AGV Transportation System Based on Knowledge of Taxis

2014 ◽  
Author(s):  
Tsuguhito Suzuki ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa ◽  
Taichi Ito
Keyword(s):  
Traffic Engineering ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Automated Guided Vehicles ◽  
Traffic System ◽  
System A ◽  
Transport Unit ◽  
The Many ◽  
High Flexibility ◽  
Agv Systems

Manufacturing systems, such as the flexible manufacturing system (FMS), have recently changed to accommodate the production of various types and volumes of products. In the FMS, however, it is difficult to change the layout of the factory and solve problems that arise. Therefore, the importance of automated guided vehicles (AGVs) is increasing because they can flexibly respond to changes in facilities and factory layouts. However, there have not been any studies that take into account the many indefinite and accidental elements regarding AGV systems. Applications of knowledge in one domain to a different domain have been drawing much attention. Such activity is called a mimetic solution. We investigated applying the knowledge of traffic engineering regarding passenger transport to conveyance of AGVs. We propose an autonomous conveyance system for AGVs based on taxi transportation strategies to solve indefinite and accidental problems. The system focuses on applying traffic engineering knowledge regarding a flexible taxi system. A taxi is a transport unit in a traffic system involving high flexibility in traveling routes and arrival/departure points. We also applied the waiting mode of taxis at stations where AGVs pick up and drop off products (P/Ds) as AGV rules to our system and investigated the system’s effectiveness and adaptability to schedule changes in the factories. To adopt a waiting mode as AGV rules, we determine the arrival/departure points that AGVs wait and changing the number of AGVs and product intervals. In addition, collision between AGVs must be considered. If a collision occurs, we have to change the factory schedule. Therefore, we took into consideration AGV collisions. We estimated the matching time, conveyance efficiency, and number of approaches as assessment functions. The matching time is the period between when a load is generated and received, conveyance efficiency is the ratio of total distance to distance traveled while empty, and approaching AGVs denotes the risk of collision. Specifically, we discuss the effect of the number of AGVs on these parameters by considering the ratio of the number of AGVs to the number of P/Ds. We demonstrated that our system is effective in terms of high conveyance efficiency and reducing the number of approaches without decreasing matching time and with a suitable number of AGVs.

Autonomous Transport System With Taxi-Type Automated Guided Vehicles Based on Transport Density

2021 ◽  
Author(s):  
Takuma Nakatani ◽  
Daiki Morikawa ◽  
Naoki Harada ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama
Keyword(s):  
Traffic Engineering ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Linear Density ◽  
Transportation System ◽  
Automated Guided Vehicles ◽  
Transport Efficiency ◽  
Traffic System ◽  
System A ◽  
Transport Unit

Abstract The importance of automated guided vehicles in flexible manufacturing systems is increasing because they can flexibly respond to changes in facilities and factory layouts. Herein, we propose an autonomous conveyance system for automated guided vehicles based on the operation of a taxi transportation system to solve indefinite and accidental problems. The system focuses on the application of traffic engineering knowledge to a flexible taxi transportation system. A taxi is a transport unit in a traffic system, with high adaptability to traveling routes and arrival/departure points. We also propose a task linear density based on transport density, which is an indicator of the scale of transport, such as that of rail transport. We evaluated the efficiency of an automated guided vehicle (AGV) transportation system that introduced waiting and cruising operations, which determine the taxi behavior, using the task linear density. The results indicate that the average matching time and task linear density were negatively correlated and that the transport efficiency improved when the P/Ds were frequently transported to a centralized location.

Autonomous Conveyance Control of AGV Based on Knowledge of Taxi Transportation Rules

2012 ◽  
Vol 523-524 ◽  
pp. 693-698 ◽  
Author(s):  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa ◽  
Takahiro Kono ◽  
Daisuke Mitsuoka
Keyword(s):  
Numerical Experiment ◽  
Traffic Engineering ◽  
System Performance ◽  
Manufacturing Systems ◽  
Present Report ◽  
Automated Guided Vehicle ◽  
Traffic System ◽  
Transport Unit

Recently, demand has been increasing for various kinds and volumes of manufacturing systems. Also, the importance of the Automated Guided Vehicle (AGV) is increasing because it can flexibly correspond to the change of equipment in a factory. This paper describes an autonomous conveyance system for AGV based on a taxi transportation strategy. The system focuses on knowledge of a flexible taxi system in traffic engineering. A taxi is a transport unit in a traffic system with higher flexibility in traveling routes and arrival/departure points compared with railways and buses. In the present report, the waiting mode of a taxi is applied as an AGV rule and investigated to verify the effect of the proposed system. Moreover, the effect of multi-loaded AGV on system performance such as matching time and conveyance efficiency is investigated. A numerical experiment has been conducted to evaluate them. As a result, it was found that introduction of multi-loaded AGV is effective at reducing matching time without conveyance efficiency decrease.

High Efficiency AGV Transportation System Based on Knowledge of Taxis: Strategy for AGV Behavior at Intersections

2014 ◽  
Vol 625 ◽  
pp. 366-371
Author(s):  
Taichi Ito ◽  
Eiichi Aoyama ◽  
Toshiki Hirogaki ◽  
Keiji Ogawa ◽  
Daisuke Mitsuoka
Keyword(s):  
Traffic Engineering ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Flexible Manufacturing System ◽  
High Efficiency ◽  
Automated Guided Vehicles ◽  
Total Distance ◽  
The Past ◽  
Waiting Strategy

Manufacturing systems have been evolving to accommodate the production of various types and volumes of products, as with the flexible manufacturing system (FMS). However, with FMS, it is difficult to change the layout of a factory and to cope with any problems that may arise. Therefore, the importance of automated guided vehicles (AGVs) is increasing because AGVs can flexibly adapt to changes of equipment in a factory. However, there has not yet been much research on systems that can respond to a large number of indefinite elements. One response to this issue might be a mimetic solution, which is the application of knowledge from one field to another. We feel that knowledge of traffic engineering, dealing as it does with the transport of passengers, could be applied to the conveyance mechanisms of AGVs. This paper describes an autonomous conveyance system for AGVs based on taxi transportation strategy. The system focuses on knowledge of a flexible taxi system in traffic engineering. We chose taxis because they operate with higher flexibility in terms of traveling routes and arrival/departure points compared with railways and buses. In this study, the waiting mode of taxis was applied as AGV rules and then tested to determine the effect of the proposed system. We came up with an equation to identify the best way of determining the waiting position. Moreover, AGV collisions are of extreme importance when AGVs run for real: if a collision occurs, we have to change the factory schedule and fix the AGV. However, in the past we have never taken account of an AGV collision, and so here we do. Two assessment functions are treated: matching time, which is the period of time elapsing between when a load is received and when a load is generated, and conveyance efficiency, which is the total distance the AGV travels divided by the total distance the AGV carries the load. Results showed that the proposed system (applying the waiting strategy of taxis as AGV rules) is effective at reducing the matching time and intersection of AGVs without any decrease in conveyance efficiency.

scholarly journals Designing Efficient Material Handling Systems Via Automated Guided Vehicles (AGVs)

2018 ◽  
Vol 5 (2) ◽  
pp. 97 ◽  
Author(s):  
Carlos Llopis-Albert ◽  
Francisco Rubio ◽  
Francisco Valero
Keyword(s):  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Material Handling ◽  
Qualitative Comparative Analysis ◽  
Decision Makers ◽  
Automated Guided Vehicles ◽  
Managerial Decision ◽  
Material Handling Systems ◽  
Level Of Satisfaction ◽  
Key Factor

<p class="Textoindependiente21">The designing of an efficient warehouse management system is a key factor to improve productivity and reduce costs. The use of Automated Guided Vehicles (AVGs) in Material Handling Systems (MHS) and Flexible Manufacturing Systems (FMS) can help to that purpose. This paper is intended to provide insight regarding the technical and financial suitability of the implementation of a fleet of AGVs. This is carried out by means of a fuzzy set/qualitative comparative analysis (fsQCA) by measuring the level of satisfaction of managerial decision makers.</p>

AGV System with Dual Motor Drive by Distributed Control

2005 ◽  
Vol 297-300 ◽  
pp. 2297-2302
Author(s):  
Yon Sang Cho ◽  
Sung Jae Jun ◽  
Heung Sik Park
Keyword(s):  
Distributed Control ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Motor Drive ◽  
Main Host ◽  
Main Computer ◽  
External Assistance ◽  
Self Powered ◽  
Set Up ◽  
Agv Systems

With the recent progress in flexible manufacturing systems (FMS) in industry, increasing attention has been given to Automatic Guided Vehicle (AGV) systems. An AGV is a self-powered unit for transporting materials between stations without needing to be controlled by an operator. Such a system has several sensors to recognize the external state, and it is designed to travel between stations without external assistance. To manage each device quickly and independently it requires a distributed controller with a main computer as the host, as well as a number of micro-controllers. In this study, an AGV system with dual motor drive was constructed. A Pentium 4 personal computer was set up as the main host for the distributed control, and this communicated with other micro-controllers in the management of the motor. The speed of each motor was also controlled by a micro-controller.

A Data-Driven Simulation-Based Optimisation Approach for Adaptive Scheduling and Control of Dynamic Manufacturing Systems

2016 ◽  
Vol 1140 ◽  
pp. 449-456 ◽  
Author(s):  
Mirko Kück ◽  
Jens Ehm ◽  
Michael Freitag ◽  
Enzo M. Frazzon ◽  
Ricardo Pimentel
Keyword(s):  
Simulation Model ◽  
Real Time ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Shop Floor ◽  
Time Data ◽  
Rush Order ◽  
Real Time Data ◽  
High Flexibility ◽  
And Control

The increasing customisation of products, which leads to higher numbers of product variants with smaller lot sizes, requires a high flexibility of manufacturing systems. These systems are subject to dynamic influences and need increasing effort for the generation of the production schedules and for the control of the processes. This paper presents an approach that addresses these challenges. First, scheduling is done by coupling an optimisation heuristic with a simulation model to handle complex and stochastic manufacturing systems. Second, the simulation model is continuously adapted by real-time data from the shop floor. If, e.g., a machine breakdown or a rush order appears, the simulation model and consequently the scheduling model is updated and the optimisation heuristic adjusts an existing schedule or generates a new one. This approach uses real-time data provided by future cyber-physical systems to integrate scheduling and control and to manage the dynamics of highly flexible manufacturing systems.

Develop a numerical approach of fuzzy logic type-2 to improve the reliability of a hydraulic automated guided vehicles

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhixiong Li ◽  
Morteza Jamshidian ◽  
Sayedali Mousavi ◽  
Arash Karimipour ◽  
Iskander Tlili
Keyword(s):  
Condition Monitoring ◽  
Flexible Manufacturing ◽  
Measurement Errors ◽  
Manufacturing Systems ◽  
Numerical Approach ◽  
Vital Role ◽  
Automated Guided Vehicles ◽  
Structural Safety ◽  
Content Type ◽  
Multiple Membership

Purpose In this paper, the uncertainties important components and the structure status are obtained by using the condition monitoring, expert groups and multiple membership functions by creating a fuzzy system in MATLAB software. Design/methodology/approach In the form of fuzzy type, the average structural safety must be followed to replace the damages or to absolutely control the decision-making. Uncertainty in the functionality of hydraulic automated guided vehicles (AGVs), without knowing the reliability of pieces, can cause failure in the manufacturing process. It can be controlled by the condition monitoring pieces done by measurement errors and ambiguous boundaries. Findings As a result, this monitoring could increase productivity with higher quality in delivery in flexible manufacturing systems with an increase of 70% reliability mutilation for the hydraulic AGV parts. Originality/value Hydraulic AGVs play a vital role in flexible manufacturing in recent years. Lately, several strategies for maintenance and repairing of hydraulic AGVs exist in the industry but are still confronted with many uncertainties. The hydraulic AGV is faced with uncertainty after 10 years of working in terms of reliability. Reconstruction of the old parts with the new parts may not have the quality and durability.

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