Verification of a CFD solver in near ground effect for aerodynamic behavior of airfoil NACA 0015

hasan sajjadi; S. F. Hosseinizadeh; Y. Vazifehshenas

Volume 8, Issue 1 , March 2011, Pages 1-10

  Numerical investigation was performed on NACA 0015 which is a symmetric airfoil. Pressure distribution and then lift and drag forces are verified. Changing of ground clearance was a considerable point. Also the angle of attack was changed from 0° to 10°. Pressure coefficient reaches its higher amounts ...  Read More


Seyyed Amir Mahdi Ghannadpour; H.R. Ovesy; M. Nassirnia

Volume 8, Issue 1 , March 2011, Pages 11-19

  ABSTRACT This paper presents the theoretical developments of two finite strip methods (i.e. semi-analytical and full-analytical) for the post-buckling analysis of isotropic plates. In the semi-analytical finite strip approach, all the displacements are postulated by the appropriate shape functions while ...  Read More

A Novel Approach to Design of Truss-Beams for Natural Frequency

N. Fazli; S. Moammad Bag Malaek; Ali Abedian

Volume 8, Issue 1 , March 2011, Pages 21-28

  Here, we present a novel two-step approach for optimum design of cellular truss-beams based on desired natural frequencies. The proposed approach at- tempts to decrease the design complexities, based on the so called Axiomatic Design, before any e ort to solve the physical problem itself. It also serves ...  Read More

A Simple Explicit Guidance Scheme Based on Velocities-to-be-Gained.

Seyed Hamid Jalali Naini

Volume 8, Issue 1 , March 2011, Pages 29-36

  In this paper, a closedloop strategy in the vertical plane is derived in order to determine the thrust direction of a launch vehicle in terms of velocitiestobe gained The two velocities-to-be-gained are utilized, here, for a given altitude and zero vertical speed in a specied nal time The formulation ...  Read More

Determination of the best-fitting reference orbit for a LEO satellite using the Lagrange coefficients

Mohammad Reza Seif; mohammad ali sharifi; M. Najafi Alamdari

Volume 8, Issue 1 , March 2011, Pages 37-44

  Linearization of the nonlinear equations and iterative solution is the most well-known scheme in many engineering problems. For geodetic applications of the LEO satellites, e.g. the Earth’s gravity field recovery, one needs to provide an initial guess of the satellite location or the so-called reference ...  Read More

Trim and Maneuverability Analysis Using a New Constrained PSO Approach of a UAV

Jalal Karimi; Seid H. Dr. Pourtakdoust; Hadi Nobahari

Volume 8, Issue 1 , March 2011, Pages 45-56

  Performance characteristic of an Unmanned Air Vehicle (UAV) is investigated using a newly developed heuristic approach. Almost all flight phases of any air vehicle can be categorized into trim and maneuvering flights. In this paper, a new envelope called trim-ability envelope, is introduced and sketched ...  Read More

Wave Propagation Approach to Fluid Filled Submerged Visco-Elastic Finite Cylindrical Shells

mostafa ghayour; Ahmad Sedaghat; Mohsen Mohammadi

Volume 8, Issue 1 , March 2011, Pages 57-67

  Multi-layer orthotropic finite cylindrical shells with a viscoelastic core in contact with fluids are gaining increasing importance in engineering. Vibrational control of these structures is essential at higher modes. In this study, an extended version of the wave propagation approach using first-order ...  Read More