• Title/Summary/Keyword: AGV (Automated guided vehicle)

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A Fuzzy Dispatching Algorithm with Adaptive Control Rule for Automated Guided Vehicle System in Job Shop Environment (AGV시스템에서 적응 규칙을 갖는 퍼지 급송알고리듬에 관한 연구)

  • 김대범
    • Journal of the Korea Society for Simulation
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    • v.9 no.1
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    • pp.21-38
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    • 2000
  • A fuzzy dispatching algorithm with adaptable control scheme is proposed for more flexible and adaptable operation of AGV system. The basic idea of the algorithm is prioritization of all move requests based on the fuzzy urgency. The fuzzy urgency is measured by the fuzzy multi-criteria decision-making method, utilizing the relevant information such as incoming and outgoing buffer status, elapsed time of move request, and AGV traveling distance. At every dispatching decision point, the algorithm prioritizes all move requests based on the fuzzy urgency. The performance of the proposed algorithm is compared with several dispatching algorithms in terms of system throughput in a hypothetical job shop environment. Simulation experiments are carried out varying the level of criticality ratio of AGVs , the numbers of AGVs, and the buffer capacities. The rule presented in this study appears to be more effective for dispatching AGVs than the other rules.

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A Design of Steering Controller for AGV using Immune Algorithm (면역 알고리즘을 이용한 AGV의 조향 제어기 설계에 관한 연구)

  • Lee, Chang-Hoon;Lee, Jin-Woo;Lee, Young-Jin;Lee, Kwon-Soon
    • Proceedings of the KIEE Conference
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    • 2002.07d
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    • pp.2824-2826
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    • 2002
  • Immune system is an evolutionary biological system to protect innumerable foreign materials such as virus, germ cell, and etcetera. Immune algorithm is the modeling of this systems response that has adaptation and reliability when disturbance occur. In this paper, immune algorithm is proposed to control four wheels steering AGV(Automated Guided Vehicle) in container yard. The adaptive immune system is applied to the PID controller. For design the PID controller using immune algorithm, we tune PID parameters by off-line manner, in order to avoid the damage from abrupt control force. Repeatedly, the PID parameters are adjusted to be accurate by on-line fine tuner of immune algorithm. And then the computer simulation result from the viewpoint of yaw rate and lateral displacement are analyzed and compared with result of conventional PID controller.

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An Economic Analysis of Transportation Equipments at Container Terminals

  • Jung, Sung-Ho;Lim, Dong-Seok;Nam, Ki-Chan
    • Journal of Navigation and Port Research
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    • v.35 no.2
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    • pp.167-172
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    • 2011
  • The motivation of this study is the recent advancement of the Straddle Carrier (S/C). Previously Straddle Carrier (S/C) system was used focusing on container lift on/off due to its lower driving speed than that of (Y/T). Shuttle Carrier is evaluated as an upgraded Straddle Carrier. Recently, however, the driving speed of (S/C) has been improved to the level of Yard Tractor and Trailer systems (Y/T), which is 30Km per hour which makes (S/C) qualified as terminal in-yard transportation equipment. This paper, therefore, aims to evaluate three types of terminal in-yard transportation equipments such as (Y/T), (AGV) and the advanced (S/C) from economic perspective. The results revealed that by observing the total costs of equipment, (S/C) is a cheaper option than (Y/T) over 20 years, and than (AGV) over 6 years.

A Study on the Economic Justification of a Material Handling System using AHP (AHP기버을 이요한 물류시스템의 경제성평가에 관한 연구)

  • 장원호;함효준;이광수
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.18 no.35
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    • pp.139-155
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    • 1995
  • This study is concerned with the economic analysis of implementing a material handling system using automated guided vehicle(AGV)s in order to improve the productivity of the production process of chinawares. Analytic hierarchy process(AHP) method for selecting the facilities of material handling systems is presented. Subsequently, as an example, a chinaware production line is analyzed for the economic analysis. The result shows that seven manpowers can be reduced. However the introduction of the new material handling system is turn out to be undesirable due to high initial cost of AGV system, Nevertheless, in the long term, automatic material handling system such as AGV system are expected to play major roles in the modern manufacturing area.

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A Study of Vehicle Operation Policy in Warehouse (창고에서의 이송장비 운영정책에 관한 연구)

  • Lee, Hue-On;Chae, Jun-Jae;Lee, Moon-Su
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.34 no.1
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    • pp.1-8
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    • 2011
  • Controlling industrial vehicle operated by human in warehouse was not simple since the information transfer for controlling the vehicle was not easy. However, as the technology for the WMS (Warehouse Management System) has been advanced and the PDA (Personal Digital Assistant) has come into wide use in a workplace, the control of man-operated vehicle became less difficult as do to AGVS (Automated Guided Vehicle System). This study examines the ways to improve the efficiency of warehouse operation through introducing rule of task assignment for the vehicles, particularly forklift. This study, basically, refer to AGV operation policy because a great number of studies for AGV dispatching rule have been done and the mechanism for the controlling vehicles is very similar. The workers in field prefer to simple dispatching rules such as Shortest Retrieval Time First (SRTF), Shortest Travel Time First (STTF), and Longest Waiting Time First (LWTF). However, these rules have potential disadvantage. Thus, several rules made up by combining rules mentioned above are introduced and these new rules use threshold value or evaluation formula. The effectiveness of these new rules are tested by simulation and the results are compared. This study proposes favorable dispatching rules for forklift in warehouse for the efficiency of the vehicle operation and stability of service level.

Workload에 따른 FMS의 버퍼 Capacity 결정에 관한 연구

  • 이정표
    • Proceedings of the Korea Society for Simulation Conference
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    • 2000.04a
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    • pp.131-136
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    • 2000
  • FMS(Flexible Manufacturing System, 유연생산 시스템)는 1960년대 최초로 소개된 이후, 뛰어난 Throughput과 Flexibility로 지금까지 다양한 생산 현장에서 널리 활용되고 있다. 하지만 복잡한 Part의 흐름, 충분하지 못한 AGV(Automated Guided Vehicle) 등으로 인한 성능 저하는 가장 큰 장애물이라 할 수 있다. 이에 대한 대비책으로 시스템 내에 설치하는 버버는 일시적인 WIP(Work In Process, 재공재고)의 저장공간으로써 Blocking, Starving 등의 발생을 최소화하는 역할을 수행한다. 따라서 이러한 버퍼의 적절한 배치는 시스템 성능에 큰 영향을 미치게 되며, 이에 본 연구에서는 각 Workstation의 Workload를 고려해 각 버퍼의 적절한 Capacity를 결정하는 과정을 소개하며, 제시된 방법론의 실효성을 시뮬레이션을 통해 검증하고자 한다.

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Driving Control of Automated Guided Vehicle Using Centroid of Gravity Method (무게중심법을 이용한 무인 운반차(AGV)의 운전제어)

  • Tack, Han Ho;Kwon, Sung Gab
    • Journal of Korea Society of Industrial Information Systems
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    • v.19 no.2
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    • pp.59-66
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    • 2014
  • AGV is most often used for the automation of freight transportation in the manufacturing industry or the distribution warehouses. AGV is fairly costly and used in goods transport between the determined location. The main control device dedicated to AGV is often autonomously developed for simplification using PLC in industry field. However, AGV developed for simplification makes many errors in traffic because it is developed for the limited simple function. Control device dedicated to AGV has been developed to solve the problem but it is almost impossible to revise the device according to the character and structure of every manufacturing industry. The purpose of this study is to propose the design method of the control system interlocked with PLC and dedicated to AGV. The control system should be to improve the problem of traffic rolling and possible to be revised according to the character of factory. It is apparent the proposed AGV system is efficient in operation in the result of several traffic performance analysis through the tests.

A Study on RTLS Technology based YT Dynamic Operation for Efficiency of Container Terminal (컨테이너터미널 운영효율성을 위한 RTLS 기반 YT Dynamic Operation 모델)

  • Shin, Jeong-Hoon;Chang, Myung-Hee;Yu, Song-Jin
    • Journal of Navigation and Port Research
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    • v.32 no.5
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    • pp.369-377
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    • 2008
  • Interest in high productivity and streamlined operation is growing amid a heated competition between ports and mega size vessel oriented operation. It becomes clear that terminals that operate YT(Yard Tractor) for transportation in container yard have less efficiency in operation and cost comparing terminals functioning AGV(Automated Guided Vehicle) system. To offset disadvantages arising out of YT operations, continual efforts (e,g YT pooling operation) were taken place for the last decade, but the result has not been fruitful; YT pooling operation still has a problem in that it cannot read individual YT's actual location. This study suggests 'YT dynamic operation model'- a practical application of RTLS(Real Time Location System) technology which will solve YT pooling operation problems.

Sensor Data Collecting and Processing System (센서 데이터 수집 및 처리 시스템)

  • Ko, Dong-beom;Kim, Tae-young;Kim, Jeong-Joon;Park, Jeong-min
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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    • v.7 no.9
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    • pp.259-269
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    • 2017
  • As emerging the '4th Industrial Revolution' by increasing the necessity of the intelligent system recently, 'Autonomic Control System' also has been the important issue. It is necessary to develop the system collecting data of machines and sensors for the autonomic control system to monitor the target system. But it is difficult to collect data because data formats of machines and sensors of the existing factories differ between each manufacturer. Therefore, this paper presents and implements data collecting and processing system that comprise 3 steps including 'ParseBuffer', 'ProcessData' and 'AddToBuffer' by using 'MTConnect' that is standard manufacturing facility data collecting middleware. Through the suggested system, we can get data in a common format usable in an autonomous control system. As a case study, we experimented with the generation and collection of AGV (Automated Guided Vehicle) data, which is an unattended transportation system in the factory. To accomplish this, we defined the data type in accordance with the MTConnect standard and confirmed the data collected through the proposed system.

On optimal cyclic scheduling for a flexible manufacturing cell

  • Kise, Hiroshi;Nakamura, Shinji;Karuno, Yoshiyuki
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10b
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    • pp.1250-1255
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    • 1990
  • This paper discusses an optimal cyclic scheduling problem for a FMC (Flexible Manufacturing Cell) modeled by a two-machine flowshop with two machining centers with APC's (Automated Pallet Changers), an AGV (Automated Guided Vehicle) and loading and unloading stations. Cyclic production in which similar patterns of production is repeated can significantly reduce the production lead-time and WIP (Work-In-Process) in such flexible, automated system. Thus we want to find an optimal cyclic schedule that minimizes the cycle time in each cycle. However, the existence of APC's as buffer storage for WIP makes the problem intractable (i.e., NP-complete). We propose an practical approximation algorithm that minimizes, instead of each cycle time, its upper bound. Performances of this algorithm are validated by the way of computer simulations.

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