EXPERIMENTAL INVESTIGATION OF EFFECTS OF WALL POROSITY AND SUCTION ON THE FLOW QUALITY IN A TRANSONIC WIND TUNNEL

Kaveh Amiri; Mohammad Reza Dr. Soltani; H. Haghiri; Mahmood Mani

Volume 6, Issue 2 , June 2009, Pages 63-70

Abstract
  A trisonic wind tunnel has been modified to improve its flow quality when operating at transonic speeds through perforated walls and side suctions. The usefulness of such a perforated wall, already known, is reduction of the blockage effect as well as the shock elimination. Two types of perforated walls ...  Read More

Stability Proof of Gain-Scheduling Controller for Skid-to-Turn Missile Using Kharitonov Theorem

M.A. Sharbafi; A. Mohammadinejad Mohammadinejad; Jafar Dr. Roshanian; Seddigh Khaki

Volume 6, Issue 2 , June 2009, Pages 71-78

Abstract
  Gain scheduling is one of the most popular nonlinear control design approaches which has been widely and successfully applied in fields ranging from aerospace to process control. Despite the wide application of gain scheduling controllers, there is a notable lack of analysis on the stability of these ...  Read More

Low-Thrust Optimal Orbit Raising with Plane Change

I. Shafieenejad; Alireza Novinzadeh

Volume 6, Issue 2 , June 2009, Pages 79-85

Abstract
  A new guidance scheme for the problem of Low-thrust transfer between inclined orbits is developed within the framework of optimal control theory. The objective of the guidance scheme is to provide the appropriate thrust steering program that will transfer the vehicle from an inclined low earth orbits ...  Read More

Experimental Study of Heat Transfer around a Cylinder in Presence of Electric Field

Soghra Rezazadeh; Esmaeil Esmaeilzadeh

Volume 6, Issue 2 , June 2009, Pages 87-97

Abstract
  In this paper, effects of EHD actuators on hydrodynamic behavior and heat transfer of air flow over a circular cylinder were considered. Pressure and temperature distributions around the cylinder were measured in presence of wire-plate EHD actuators. The Reynolds number based on cylinder diameter (d) ...  Read More

‌Progressive Damage Analysis of Laminated Composites using Continuum Damage Mechanics

Hoss Hosseini Toudeshky; Bijan Mohmmadi; Mohammad Dr. Sadr-Lahijani

Volume 6, Issue 2 , June 2009, Pages 99-113

Abstract
  In this paper, progressive damage and global failure of composite laminates under quasi-static, monotonic loading are investigated using 3D continuum damage mechanics. For this purpose, a finite element program has been developed using an eight-node 2D layered element including layer-wise plate theory. ...  Read More

Buckling and vibration analysis of angle -ply symmetric laminated composite plates with fully elastic boundaries

S. Amirahmadi; R. Ansari

Volume 6, Issue 2 , June 2009, Pages 115-120

Abstract
  The main focus of this paper is on efficiency analysis of two kinds of approximating functions (characteristic orthogonal polynomials and characteristic beam functions) that have been applied in the Rayleigh-Ritz method to determine the non-dimensional buckling and frequency parameters of an angle ply ...  Read More