Research Paper
Finite Time Guidance Law to Intercept Desired LOS Angle Using NTSM Control

Vahid Behnamgol; Ahmadreza Vali; ali mohammadi

Volume 11, Issue 2 , September 2018, Pages 1-10

Abstract
  Nonsingular terminal sliding mode (NTSM) guidance for intercepting the desired line of sight (LOS) angle in terminal phase is proposed in this paper. In order to satisfy the predefined LOS angle and to intercep into target, a nonsingular terminal sliding variable is introduced. In reaching phase, in ...  Read More

Research Paper
Numerical Simulation and Optimization of Forced Convection Heat Transfer of Magnetic Nanofluid in a Channel in the Presence of a Non-Uniform Magnetic Field

Mohmmad Goharkhah; Mostafa Esmaeili; Mehdi Ashjaee

Volume 11, Issue 2 , September 2018, Pages 11-19

Abstract
  In this paper, the effect of an external non-uniform magnetic field on forced convective heat transfer of magnetite nanofluid (ferrofluid) in a heated channel is studied numerically. The main goal is to emphasize the importance of magnetic field location and investigate the possibility of heat transfer ...  Read More

Research Paper
Robust Switching Surfaces Sliding Mode Guidance for Terminal Rendezvous in Near Circular Orbit

seyed aliakbar kasaeian; Masoud Ebrahimi

Volume 11, Issue 2 , September 2018, Pages 21-31

Abstract
  The present study aims to present a safe, robust and fast orbital rendezvous guidance. The scheme improves the rate of convergence to equal point until the chaser spacecraft reaches the proximity target. Then, the robust guidance structure is transformed in order to avoid singularity and provide safe ...  Read More

Research Paper
Lyapunov-basedAdaptive SmoothSecond-order Sliding Mode Guidance Law with Proving Finite Time Stability

Vahid Behnamgol; Ahmadreza Vali; ali mohammadi; َAshknaz Oraee

Volume 11, Issue 2 , September 2018, Pages 33-39

Abstract
  A new adaptive smooth second-order sliding mode control is proposed for uncertain nonlinear systems in this paper. The finite time stability is proved using a Lyapunov technic. The proposed controller consists of an adaptive term equal to the uncertainty in finite time. This algorithm is used to design ...  Read More

Research Paper
Velocity and Body Rate Control of a Spacecraft Using Robust Passivity-Based Control

Hamed Chenarani; Tahereh Binazadeh; Mohammad Hosein Shafiei

Volume 11, Issue 2 , September 2018, Pages 41-46

Abstract
  This paper considers the problem of asymptotic stabilizing of velocity and body rates of a spacecraft in the presence of uncertainties and external disturbances. One of the important methods in controller design for nonlinear systems; is designing based on the passivity concept. This concept which provides ...  Read More

Research Paper
Optimal Mission Design for Moon Exploration Expedition

Hassan Naseh; Mehran Mirshams; Elyas Fadakar; Mehdi Jafari Nadoushan

Volume 11, Issue 2 , September 2018, Pages 47-53

Abstract
  The main goal of this paper is to introduce the Moon exploration mission design based on existing technology.The Moon exploration mission design entailsoptimal maneuvering orbit, payload and launch vehicle design. Optimal maneuvering orbit is designed with respect to Circular Restricted Three Body Problem ...  Read More

Research Paper
Low-Profile Helical Antenna for Space Application

Fatemeh Sadeghikia; Ali Karami Horestani

Volume 11, Issue 2 , September 2018, Pages 55-59

Abstract
  The aim of this study is to examine the effects of diameter of ground conductor in an axial mode helical antenna on some of the characteristics of the antenna. It is shown that a proper ratio of diameter of ground plane to diameter of helix can be chosen to make a trade-off between the performance of ...  Read More