Attitude Stabilization and Manauvring of Agility Nanosatellite with Control Moment Gyros

A.A Nikkhah; J. Tayebi; J. Roshanian

Volume 7, Issue 2 , July 2014, Pages 1-9

Abstract
  In this paper attitude control system of nanosatellite based on Single Gimbal Control Moment Gyroscope (SGCMG) is presented. A LQR/LQG method is developed for stability of satellite and a feedback quaternion strategy is used for maneuvering mode. In the stabilization mode LQR/LQG controllers ...  Read More

Empirical Modeling of Clarity in the Caspian Sea using MERIS Data

H. Taheri Shahraaini

Volume 7, Issue 2 , July 2014, Pages 11-21

Abstract
  In this study, univariate linear regression model was developed for monitoring secchi depth in the Caspian Sea using level 1b and level 2 data. The in-situ measurements were carried outduring 25 one-day campaigns in the Caspian Sea. In this study, 25 level 1b MERIS images were utilized and then converted ...  Read More

Study of Recovery System Performance of a Sounding Rocket using Launching Tests

F. RasiMarzabadi; R. Meshkani; H. Pouryavi; M. A. Farsi; M. Ebrahimi

Volume 7, Issue 2 , July 2014, Pages 23-33

Abstract
  According to the importance of knowing aerodynamic parameters of parachutes used as recovery system of a sounding rocket, some launching tests were conducted to achieve the acceptable reliability. A testing rocket which simulated the recovery condition of the sounding rocket was used in these tests. ...  Read More

Comprehensive Code of Remote Sensing Satellite Conceptual Design

A. Saghari; M. Mirshams; A. Jafarsalehi

Volume 7, Issue 2 , July 2014, Pages 35-47

Abstract
  In this article the results of research to achieve a comprehensive code of remote sensing satellite conceptual design is presented. In compiling the code with considering the design philosophy of "better, faster, cheaper" has been attempted in caddition to the use of new technologies and the experiences ...  Read More

Investigation of Length and Velocity Variation Effects on Unsteady Separation of Parallel Boosters

M. HadiDoolabi; A.M. Gorji; H.R. Tajik

Volume 7, Issue 2 , July 2014, Pages 49-61

Abstract
  This study, focuses to simulate separation process in different launchers numerically using fluent software. In present case, an aerodynamic equations coupled with rigid body dynamics, because of resultant aerodynamic forces and gravity, is developed to simulate the detachment motion of strap-on boosters. ...  Read More

Attitude Control System Design Based on Fluidic Momentum Controllers under Adaptive Sliding Mode

A.H. Taghavi; A. Soleymani; T. Shojaee

Volume 7, Issue 2 , July 2014, Pages 63-74

Abstract
  Recently, new actuators known as fluidic momentum controllers (FMC) have been proposed for satellite attitude control. This actuator has many advantages such as high applied torque to weight ratio, easiness in assembly, low transmitted vibration and so on respect to the other momentum exchange devices ...  Read More

Neural Network Based Diagnostic Indication of a Liquid Propellant Engine with Faulty Data Collection System

S. Khodadadiyan; R. Farokhi; D. Ramesh

Volume 7, Issue 2 , July 2014, Pages 75-83

Abstract
  The aim of the paper is to describe a methodology of damage detection in the liquid propellant engine which is based on artificial neural networks in combination with stochastic analysis. It is assumed that the liquid propellant engine have faulty data collection system. Then a filtering algorithm for ...  Read More

Automatic Reading of a Trade Gyrocompass Using Image Processing and Neural Networks

B. Shahgoli; P. Moallem; M. KavoshTehrani; Sh. ParvinJahromi; S. A. Hosseini

Volume 7, Issue 2 , July 2014, Pages 85-92

Abstract
  Gyrocompass is used to justify and aim (orient) the missiles; it is used in equipment and accuracy of launch position as well to find azimuth in particular points. Observations and reading in this kind of compass are done optically which suffers from low accuracy and optical illusion. In this paper a ...  Read More