Papers by Keyword: AGV

Abstract: Modern automated manufacturing environments are highly agile and are confronted with continuous change in market demands/customers’ requirements. Flexible Manufacturing Systems (FMSs) cater to the need of extensive flexibility and ability to manufacture different variety of batch quantity of components simultaneously in the highly dynamic environment. In FMSs, automated guided vehicle (AGV) systems are commonly used to control complex automated material handling systems. Path design as well as planning and control of AVGs are challenging problems for researchers. In this work, an attempt has been made to model AGVs in FMS using fuzzy logic technique as a modeling tool. A hypothetical FMS system with two AGVs, four processing stations, one buffer and an input/output station is considered. Parts routing, processing operations, allotted machines, processing time and part-mix variation are inputted. AGVs movement to be accomplished for movement of parts obtained is based on rule base consisting of ‘If – then’ statements. Movement of AGVs in FMS without any deadlock for moving the part in an optimized path so as to achieve maximum utilization of the system is aimed. The methodology is demonstrated with illustrative examples.

Abstract: In order to adapt to the mass customization, a new concept of material flow systems that can handle product varieties is needed. Firstly, this paper analyzes the current problems and future requirements of the structure of a new production system. Then, in response to current limitations, the corresponding concept of a decentralized transport system for low payloads with high flexibility is introduced. For this purpose, automated guided vehicles (AGVs) as an effective means of transport are used. The key issues of the autonomous transport system are then researched, and an improvement of the multiple object tracking algorithm is proposed. We demonstrate the performance of our proposed system with a designed workspace. Based on the demonstration and experiment, results show that the proposed concept and the tracking algorithm are appropriate and robust to be implemented in real-time applications.

Abstract: Wireless network used in office is much cheaper than industrial-type devices. Using of office-type WiFi communication in industrial environment for exchange data between mobile platform (AGV) and base station is the core of this paper. The scope of research is data limitation flow in function of distance between system nodes and usability of office-type (low cost) equipment for establishes stable communication on industrial environment. Paper describes two experiments in two types of production environment. First one was realized in condition where several disturbance sources were active (like metal forming machine-tools, constant energy welding machines, electric overhead crane, high power electric motors, electronic inverters etc. All this machines contaminate radio environment around them and make serious obstacles for WiFi data exchange. Second experiment was executed in assembling hall of automobile production plant in which radio contamination is significantly lower.

Abstract: Lithium ion battery, as a new type of energy storage equipment, has small size, large power density, high individual voltage, low rate of self-discharging and small self-resistance etc. It substitutes the traditional power battery in AGV. Since it will disconnect from the electric power system after charging, it only has to rely on the energy left to finish all tasks, research on power consumption of its protection circuit is especially important. Experiments prove that the power consumption of improved protection board could be reduced by around 50%, efficiently improves the performance of lithium ion battery protection circuit.

Abstract: Halbach motor is a new type permanent magnet synchronous motor: unique permanent magnet structure makes its magnetic field unilateral and distributed sinusoidal, increases the magnetic density of air gap while decreases the magnetic density of rotor. It helps to raise the power density and efficiency of power, reduces the size of motor and the pulsating torque. The full-digital variable frequency adjustable speed AGV system with halbach motor based on the TMS320F2812 is designed, and its experiment result proves that it performed well and environment-friendly, saving the energy as well.

Abstract: Due to the merits of small size, high power density, high voltage, low self-discharge and low resistance, li-ion battery can replace traditional power battery and be used in AGV system. Over-voltage and low-voltage protection circuit, temperature protection circuit, equalizer circuit, self-locked circuit and voltage display circuit are designed; Equalization circuit can keep consistency of each cell used in the system; Self-locked circuit can make the system much more stability while the display circuit can ahcive the information of the power system. Experiments prove the effectiveness of these designs.

Abstract: Li-ion battery, with the advantage as small size, large power density, high individual voltage, low self-discharge rate, and low internal resistor so on, substitutes the traditional power battery used in AGV system. In the practical application, Li-ion battery discharge with large current after a period of time, the upper voltage of every cell will be non-consistency, and the power system will work abnormally. In the case, the intelligent management of li-ion battery is designed.Experiment result improves that the system can effectively protect the li-ion battery and realize the energy feedback.

Abstract: In recent years, Automatic Guided Vehicle (AGV), as a mobile robot, has been developed rapidly, especially with the rapid development of sensor technology, navigational technology has been widely used in the field of automatic guided vehicle. Meanwhile, the guidance mode has broken through the single way of track-laying and is developing towards a diversified direction. This paper elaborated the operating principle and the advantages of several commonly used ways of guiding, put forward the way of guiding which combined laser guidance with electromagnetic guidance and laser site positioning.

Abstract: Automated Guided Vehicle is a mobile robot used in various industries to transfer goods and materials from one place to another in the industrial compound such as production line and warehouses. Due to the payload it should carry, the design should be able to handle certain level of mechanical stress. The optimization study is important to assure the material and design is safe an optimum under the specified conditions before the AGV is manufactured. In this study, a conventional AGV designed previously by an AGV manufacturer to bring a payload of 70 kg is analyzed using the Finite Element Method (FEM) and SolidWorks software is used to do the FEA simulation. This paper also explain on how the factor of safety for the AGV is derived. The parameter change in this study were the thickness of the sheet metal used to build the AGV while the study output is the stress level, factor of safety and weight of the AGV.

Abstract: This paper concerns trajectory tracking control of AGV. The model of forked AGV was simplified from a three-wheeled vehicle model to a “bicycle” model. The dynamic model of vehicle lateral motion was built depending on Newtown’s second law and the analysis of lateral tire forces. The optimal control linear quadratic regulator was applied to achieve trajectory tracking control. Use the MATLAB and CarSim to simulate. The satisfied results proved that the control algorithm was effective and could make the system stable.