An Investigation on the Effect of Chemical Kinetics Mechanisms in the Modeling of Combustive Gaseous Oxidizer Flow on a Solid Fuel Surface

M. Ahangar; R. Ebrahimi

Volume 3, Issue 1 , July 2010, Pages 1-13

Abstract
  In this study, the combustion process of gaseous Oxygen on the surface of HTPB solid fuel has been investigated. To simulate the chemically reactive flow, Navier-Stokes equations and species transport equations were solved using LU-SW implicit scheme. Modeling this kind of combustion process demands ...  Read More

Investigation and Analysis of Seperation System of Kavoshgar-3

M. A. Farsi; N. Ariaii-Far; R. Kalantari-Nezhad; M. Bahrami

Volume 3, Issue 1 , July 2010, Pages 15-23

Abstract
  Separation system is one of the main sub-systems in every space device and missile. This system is used to separate active and inactive sections in a missile. The separation process should be done accurately. A separation system explained in this paper was designed and produced based on mission, rocket ...  Read More

Drivation of System Level Characteristics of a Manned Spacecraft by Applying Statistics Models

M. Mirshams; L. Khaladjzadeh

Volume 3, Issue 1 , July 2010, Pages 25-36

Abstract
  Designing a manned spacecraft carrying one or two persons to low Earth orbits needs to recognize system level requirements and acquire technical data developed in this eria. Revising manned spacecrafts’ characteristics leads to recognize system level requirements and achieve applicable results ...  Read More

Short Time Stability Approach to Guidance Law Design

E. Mohammadzaman; H. R. Momeni

Volume 3, Issue 1 , July 2010, Pages 37-44

Abstract
  In this paper a new guidance law is proposed to guarantee the stability of the guidance loop considering first order pursuit dynamics using short time stability theorem. As homing guidance is operates over a finite time, short time stability criterion which is defined over a specified time interval can ...  Read More

A Spin Satellite Imaging System Design with Real Time Imaging Capability Using FPGA

H. Bazrafshan; Sh. Baradaran Shokouhi; B. Ghorbani Vagheii

Volume 3, Issue 1 , July 2010, Pages 45-54

Abstract
  In this paper, the complete block diagram of the imaging payload of a spin satellite capable of real time imaging is designed. Because of the satellite spin, the system needs to recognize the suitable camera angle in order to start imaging. The angle is the starting point of the observation of the part ...  Read More

Investigation of the Effect of Reinforcement on Thermo-Physical Properties of Ablative Heat Shields

Y. Ghaderi-Dehkordi

Volume 3, Issue 1 , July 2010, Pages 55-65

Abstract
  In the present study, in order to choose the suitable heat shields a comprehensive investigation was performed. Therefore, different properties of each type of heat shields including ablative and thermo-physical properties were measured separately. Finally, the obtained properties were compared. The ...  Read More

Optimal Impulsive Maneuver Between Elliptical Coplanar-Noncoaxial Orbits

M. Navabi; M. Sabatifar

Volume 3, Issue 1 , July 2010, Pages 67-74

Abstract
  Orbital transfer has a significant role in any space mission. This transfers generally categorized in impulsive and continuous maneuvers. An important challenge is fuel consumption in the maneuver. This problem is considered as a required Δυ problem. Hence, minimization of Δυ ...  Read More

Modeling Halo Orbits and the Associated Manifolds in the Restricted Three Body Problem

M. Jafari Nadoushan; S. H. Pourtakdoust

Volume 3, Issue 1 , July 2010, Pages 75-80

Abstract
  Development of halo orbits and their associated invariant manifolds are investigated. Halo orbits play a fundamental role in complex space mission designs. In essence, halo orbits are periodic solutions of the restricted three body problem (R3BP) determined under specific initial conditions. In this ...  Read More