Modeling of Shutdown Process in Liquid Propellant Rocket Engines

M. Shafiey Dehaj; R. Ebrahimi; H. Karimi; A. Jalali; M. Naderi

Volume 6, Issue 4 , January 2014, Pages 1-11

Abstract
  The effects of liquid propellant rocket engines thrust termination transients are important in achieving the launch vehicle’s desired final velocity with the required precision. In this paper, a mathematical model has been developed to predict the changes in the combustion chamber pressure and ...  Read More

Design and Aanalysis of Sandwich Panels as a Support Structure of Solar Cells for a GEO Communications Satellite

M. M. Shokrieh; M. Fakoor; Z. Daneshjoo

Volume 6, Issue 4 , January 2014, Pages 13-22

Abstract
  Solar panels are used in satellites to absorb solar energy and supply the power needed for space missions. Mission definition and satellite lifetime is restricted by the way and the amount of energy that can be supplied for satellite subsystems. Therefore, the design of satellite solar panels as a unique ...  Read More

Sensitive Volume Modeling in Calculation of Space Radiation-Induced SEU Cross Section

S. Boorboor; S. A. H. Feghhi; H. Jafari

Volume 6, Issue 4 , January 2014, Pages 23-28

Abstract
  Shape and size of sensitive volume are the most important parameters to model electronic devices for calculation of the SEU rate from space radiations. So far different models have been proposed for estimation of the sensitive volume. In this work, results of three models including RPP, Tetrahedral and ...  Read More

Explicit Flatness-Based Guidance in Reentry Phase

R. Esmaelzadeh

Volume 6, Issue 4 , January 2014, Pages 29-36

Abstract
  An explicit guidance law is developed for a reentry vehicle. Motion is constrained to a three-dimensional Bezier curve. Acceleration commands are derived by solving an inverse problem that combined with differential flatness approach. Trajectory is related to Bezier parameters. A comparison with pure ...  Read More

The Study of Hypergravity and Flight Stress on Different Cell Lines Function in Sounding Rocket

Z. Hajebrahimi; L. Alidoust; M. Arabian; E. Alavi; M. Ebrahimi; M. Bahrami

Volume 6, Issue 4 , January 2014, Pages 37-42

Abstract
  Stress environment of space flights including hypergravity and microgravity effect cell functions and processes. We studied effect of hypergravity and flight stress on function, death, growth and cellular damage of five cell lines including human vascular endothelial cells, rat bone marrow stromal cells, ...  Read More

A New Approach to Design an Optimum Launch Window for a Sample Micro-Satellite

M. S. Mohammadi; M. Mortazavi; M. Malekan

Volume 6, Issue 4 , January 2014, Pages 43-52

Abstract
  According to mission requirements in many of space missions, an exact time should be assigned for launch date namely launch window. Among various parameters influencing launch window, in this article a couple of most mission related ones are being researched. First is some constraints on handling satellite ...  Read More

Developing a Multi-Objective Guidance Scenario for the Entry to the Earth’s Atmosphere

A. R. Alemi Naeeni; J. Roshanian

Volume 6, Issue 4 , January 2014, Pages 53-62

Abstract
  In this paper, a multi-objective guidance scenario has been developed which could be used to improve the accuracy of sub-orbital modules at the entry to the earth’s atmosphere. Developed algorithm could be used for the trajectory shaping and adjusting of the trajectory relative to the desired position. ...  Read More

Total Ionizing Dose Test on AT90CAN128 MicroController

V. Sedghi; M. Safavi Homami

Volume 6, Issue 4 , January 2014, Pages 63-67

Abstract
  Rapid growth in using Commercial of The Shelf (COTS) components in Space missions compelled the researchers to evaluate the performance of this components in space environment. AT90CAN128 commercial microcontroller is used in AutSat mission due to high performance, simple structure, low power consumption ...  Read More