فهرست مطالب

Journal of Majlesi Journal of Mechatronic Systems
Volume:4 Issue: 1, Mar 2015

  • تاریخ انتشار: 1394/02/06
  • تعداد عناوین: 8
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  • Azadeh Ahmadi, Ahmad Hajipour Pages 1-5
    In this paper, two distinct topologies-based fuzzy logic controllers for DC-DC converters are presented. The fundamentals governing the design, control and performance of the DC-DC converters are also illustrated. Two methods for computing the duty cycle are investigated. Simulation results for Buck converter using first topology and second method for computing the duty cycle have been obtained using appropriate scaling factors associated with the input variables of the fuzzy control.
  • Sadegh Hesari, Mohammad Bagher Naghibi Sistani Pages 7-10
    The main idea of this paper is to use Artificial Neural Networks (ANN) to create a model of synchronous generator with water turbine. In this paper, a characteristic of generator torque and speed with the highest number of learning data is given to a feed-forward neural network, and the network estimates one of the fastest learning methods of load angle (δ). The more is the number of learning data, the more sensitive are the small errors for us. Then, using the neural network toolbox, we investigated the generator stability with an error in increasing the input torque to more than the nominal amount. The neural network found the error easily. The simulation results confirm the proposed method.
  • Mohsen Khazaei, Modjtaba Rouhani Pages 11-15
    Anti-Lock Braking System has been designed to improve the effects of the braking process and retain the ability of steering vehicle. But ABS could not be effective in inadequate condition of the road. Coefficient of friction between tires and road is a non-linear function and a ratio of the slip, thus it is different for different surface of the road. In this study, the longitudinal friction coefficient between tires and the road is considered near the maximum value. Stimulations have been conducted in 1/4 car model by MATLAB. The results demonstrated that ABS with identifying system of road surface compared with previous generation of ABS system has better performance and recommended controller could maintain the slip in optimal value so that the vehicle could stop without slipping.
  • Mohammad Tabatabaei, Hamid Safikhani Pages 17-20
    In many industrial plants, reaching a non-overshooting transient response is important. In this paper, the PID controller is designed to achieve a stable closed loop transfer function with non-overshooting step response. To reach this goal, the PID controller parameters are adjusted to attain a monotonically decreasing frequency response magnitude. This results in a non-overshooting or minimum-overshoot closed loop system step response. Thus, 3-D regions are obtained in the parametric space such that the resultant closed loop system with theses parameters is stable and its transient response has no overshoot. Obviously, a variety of controllers could be chosen in the mentioned region. Simulation results are given to show the effectiveness of the proposed method.
  • Amin Hashemi Beni, S.M. Hoseini Pages 21-32
    A general class of industrial motion control systems has the structure of a nonlinear dynamical system preceded by some nonlinearities in the actuator, either deadzone, backlash, saturation, etc. Due to the nonanalytic nature of the actuator nonlinearities and the fact that their exact nonlinear functions are unknown, such systems present a challenge for the control design engineer. A dynamic inversion compensation scheme is used for backlash. The compensator uses the output feedback technique with neural networks (NN) for inverting the backlash nonlinearity in the feedforward path. The technique provides a general procedure for using NN to determine the dynamic preinverse of an invertible dynamical system. A tuning algorithm is presented for the NN backlash compensator which yields a stable closed-loop system.
  • Sandeep Bhongade, Prachi Rusia Pages 33-37
    In this paper, an efficient design scheme for implementation of digital PID controller using FPGA based 8051 microcontroller core is presented as a part of temperature control system. The differential equation includes different controller gains, required to be tuned for desired output response. Usually PID control is much used for second or higher order systems. On the other hand, PI and PD controllers are preferred for first order systems. Here controller is implemented to fulfill the demand of achieving and maintaining the temperature of an Al plate to the desired set point temperature with control precision better than 0.1°C, acceptable rise time and settling time. In implementation load used is a first order system as it has single heat transfer element. Microsemi ProASIC3E family A3PE3000 FPGA development board with suitable ADC and other peripherals is used for realizing the hardware. VHDL is used for code development of differential equation. Microcontroller core is used for configuring and interfacing to peripherals using High level language C. Libero IDE is used to develop, simulate, synthesis and place & route the design.
  • Ehsan Akbari, Abdolreza Sheikholeslami, Javad Rouhi Pages 39-47
    Today power quality issues related to electric power distribution companies are one of major concerns. In this paper, compensation voltage sag/swell by Dynamic Voltage Restorer (DVR) based on Modular Multilevel Cascade Converter - Double Star Chopper Cell (MMCC-DSCC) has been studied and simulated. The proposed half-bridge inverter six cells in each phase is composed The output voltage of the inverter line to level was thirteen, so very low harmonic content of using a very small LC filter output sinusoidal voltage quality can be found. To extract the switching pattern of the phase shift multi-carrier modulation (PSHM) is used. Performance DVR at Voltage sag/swell multilevel inverter (MMCC-DSCC) structure-based DVR and DVR based two-level inverters have been compared. The results of simulation software MATLAB / SIMULINK shows a properly functioning system.
  • Abolfazl Khatami, Hamidreza Tabatabaei Pages 49-55
    In this paper, we propose a guidance law for middle and final phases of a medium-range missile the parameters of which are optimized using genetic algorithms. Using a simple proportional guidance law and considering the aerodynamic characteristics of missile the proposed guidance law provides a better performance than proportional experimental guidance. Considering that proportional navigation constants at the time of launching are two factors that play a critical role in hitting the target, in this case, identifying the constant proportional navigation is considered as an optimization problem and it has been tried to set this parameter using a genetic algorithm to obtain the lowest error. Simulation results of six degrees of freedom indicate that the proposed method has a better performance than the other methods.