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Volume 2 (2); Aug 2013

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PII: S232251141300005-2
Gain scheduling controller for missile flight
control problem by applying (LQR)

C1

Original Research, B5

Ghasemzadeh Ebli H., khani A., and Azizi A.

J. World. Elect. Eng. Tech., 2(2): 17-21, 2013.

ABSTRACT: In recent years, particularly by increasing the importance of a missile defense technology and its application in various fields, many scientists have been attracted to this position.The actual model of a missile system is nonlinear, and the dynamical behaviors of nonlinear control systems are related to changes in the operating range. In this paper at first we used the Gain scheduling controller to control the flight model and then by applying the linear quadratic regulator (LQR), which is an optimal control method, the system response is studied. Because of high flexibility of quadratic function, use of the LQR has been increased. Here after applying the optimization method we found the under shoot in the result of system missed, thus the system stability is guaranteed.
Key words:
Gain scheduling controller, Missile flight controller problem, LQR control, type-1 servo system

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PII: S232251141300006-2
Imperialist Competitive Algorithm for Optimal Reactive Power Dispatch Problem: A Comparative Study
C3

Original Research, B6

Ghasemi M., Roosta A.

J. World. Elect. Eng. Tech., 2(2): 22-29, 2013.

ABSTRACT: In this paper, imperialist competitive algorithm (ICA) is applied to solve the optimal reactive power dispatch (ORPD) problem. The ORPD problem is a key instrument to achieve secure and economic operation of power systems. Due to complex characteristics of ORPD, heuristic optimization has become an effective solver. Based on the IEEE 14- and 30- bus systems, ICA is compared with some basic algorithms. Simulation results show that ICA is a suitable algorithm for ORPD and should deserve more attention.
Key words: Optimal Reactive Power Dispatch (ORPD), Heuristic Optimization.

 

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PII: S232251141300007-2
Survey of Embedding MSRRs Structure on Compactness and Bandwidth Operation of UWB Antenna
C4


Original Research, B7

Alizadeh F., Zayer R., and Dadashi M.

J. World. Elect. Eng. Tech., 2(2): 30-36, 2013.

ABSTRACT: The effect of embedding regular and modified multiple split-ring resonators on the ultra-wideband antenna is proposed and studied. By embedding the structures on the compact UWB antenna a novel method for enhancing the performance of the antenna in the desired frequencies is realized. The proposed configurations are useful for enhancing the banding by combining several resonant modes. The antenna in special conditions, in which the MSRR structures rings width are minimized and modified to avoid of notching shows good impedance matching in desired frequencies.

Key words: Compact Antennas, Monopole Antenna, Split-ring Resonators (SRRs), Ultra-Wideband (UWB) Antennas.

 

 

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