Design of Fault Detection, Isolation and Accommodation Algorithm for Attitude Determination System of a 3-Axis Satellite

S. S. Nasrolahi; H. Bolandi; M. Abedi

Volume 5, Issue 2 , July 2012, Pages 1-13

Abstract
  In this study, a fault tolerant Attitude Determination System (ADS) has been designed which provides fault detection, isolation and tolerant abilities in this system. Suggested approach is based on derivation of all possible rotations between body and orbital frames and comparison of Euler angles provided ...  Read More

Consideration on Actualizing the Non-Dimensional Star Pattern Recognition Algorithm for a Typical Laboratory Star Tracker

Jafar Roshanian; Shabnam Yazdani; S. Mehdi Hasani; Masoud Ebrahimi Kachouie

Volume 5, Issue 2 , July 2012, Pages 15-23

Abstract
  Star trackers are one of the most accurate attitude determination devices of a spacecraft. Star trackers are able to determine the spacecraft attitude with the use of recognizing the stars within their field of view. One of the major subsystems of star tracker software is the star pattern recognition ...  Read More

Dynamic Modeling of Flexible Manipulators Using Finite Element Method and Optimal Control of their Motion

M. H. Korayem; M. Nazemizadeh; H. N. Rahimi

Volume 5, Issue 2 , July 2012, Pages 25-34

Abstract
  Flexible manipulators have plentiful applications in Aero-Space fields, due to their less weight and maneuverability. In fact, the ratio of their load carrying capacity to their weight, make them more excellent over their rigid ones. Moreover, these manipulators are known as good candidates in Aero-Space ...  Read More

Process of Liability Principles in International Space Law

H. Kazemi; A.A. Golroo

Volume 5, Issue 2 , July 2012, Pages 35-48

Abstract
  The international system proposed the liability convention 1972 for compensating damages occurred while utilizing space. However, certain key principles of liability such as some rules of conflict law and jurisdictions have been neglected there. This convention failed to provide a unified regime like ...  Read More

Reliability Allocation to Launch Vehicle Subsystems by Using AHP Method in Conceptual Design Phase

M. Mirshams; S. Irani; A. M. Akhlaghi; H. Naseh

Volume 5, Issue 2 , July 2012, Pages 49-57

Abstract
  The goal of this paper is presenting a methodology for reliability allocation to launch vehicle subsystems using Analytical Hierarchy Process (AHP) method in conceptual design phase. In this methodology, the goal function is reliability and the main considered criterions are technology, complexity, operational ...  Read More

Implementation of Three Axis Attitude Controllers for Evaluation of a Micro-gravity Satellite Simulator

A. H. Tavakkoli; A. Kalhor; S. M. M. Dehghan

Volume 5, Issue 2 , July 2012, Pages 59-68

Abstract
  In this paper the performance of a three Degrees Of Freedom simulator is evaluated. This platform is considered as an important instrument generally used in performance tests of spacecraft attitude determination and control subsystem on the ground. A hemispherical air bearing is used to provide micro ...  Read More

Effects of Erosive Burning on Solid Rocket Motor Internal Ballistics

E. Rezaeian Parsa; S. M. Mirsajedi

Volume 5, Issue 2 , July 2012, Pages 69-74

Abstract
  In this study, solid rocket motor internal ballistic, has been investigated. Flow field consists of internal grain space and converging-diverging nozzle. Axisymmetric, compressible and transient Euler equations have been considered as governing equations and erosive burning has been considered as an ...  Read More

Fabrication and Test of Flexible Joint Thrust Vector Controlling System in SRM Using Polyurethane Elastomer

H. Mahdavy Moghaddam; M. M. Javadi

Volume 5, Issue 2 , July 2012, Pages 75-83

Abstract
  Outer space ballistic missiles use thrust vector control system and it is because aerodynamic surfaces are not efficient in thin air.Flexible joint is the most useful type of thrust vector control system through satellite transporters and ballistic missiles based on solid fuel. Most common type of elastomer ...  Read More