Aerospace Science and Technology
A new method to primary and optimized design of ducted fan

Ahmad Sharafi

Volume 14, Issue 2 , October 2021, , Pages 52-65

  In the present study, the aerodynamic performance of the ducted fan is investigated using the surface vorticity method and the lifting line theory. In previous research, to consider the effects of the duct, most of the parameters derived from empirical tests or computational fluid dynamics. Our goal ...  Read More

Optimization of Composite Stiffened Cylindrical Shell using PSO Algorithm

M. Fakoor; P. Mohammadzade; E. Jafari

Volume 11, Issue 2 , October 2017, , Pages 43-51

  Composite stiffened cylindrical shells are widely used as primary elements in aerospace structures. In the recent years, there has been a growing research interest in optimum design of composite stiffened cylindrical shell structures for stability under buckling load.  This paper focuses upon the ...  Read More

Optimization of Sound Transmission Loss of a Composite Rectangular Plate with Infinite Baffle

A. nouri; S. Astaraki

Volume 11, Issue 2 , October 2017, , Pages 53-63

  In this paper, optimization of the sound transmission loss of finite rectangular anisotropic laminated composite plate with simply supported boundary conditions has been developed to maximize transmission loss. Appropriate constraints were imposed to prevent the occurrence of softening effect due to ...  Read More

Preliminary Design of Spacecraft Attitude Control with Pulse-Width Pulse-Frequency Modulator for Rest-to-Rest Maneuvers

S.Hamid Jalali -Naini; Sh. Ahmadi Darani

Volume 11, Issue 1 , June 2017

  In this paper, the preferred region of design parameters for quasi-normalized equations of single-axis attitude control of rigid spacecraft using pulse-width pulse-frequency modulator (PWPFM) is presented for rest-to-rest maneuvers. Using the quasi-normalized equations for attitude control reduces the ...  Read More

Optimization of Moving Wingin Ground Effect using Response Surface Method

M. H. Djavareshkian; A. Esmaeili

Volume 10, Issue 2 , September 2013

  Optimization of the sectional wing in ground effect (WIG) has been studied using ahigh order numerical procedure and response surface method (RSM). Initially, the effects of the ground clearance, angle of attack, thickness, and camber of wing have been investigated by a high-resolutionscheme, which is ...  Read More

Midcourse Trajectory Shaping for Air and Ballistic Defence Guidance Using Bezier Curves

Alireza Mohamadifard; Abolqasem Naghash

Volume 8, Issue 2 , September 2011, , Pages 87-95

  A near-optimal midcourse trajectory shaping guidance algorithm is proposed for both air and ballistic target engagement mission attributes for generic long range interceptor missile. This guidance methodology is based on the maximum final velocity as the objective function and maximum permissible flight ...  Read More

An Introduction to a New Criterion Proposed for Stopping GA Optimization Process of a Laminated Composite Plate

A. Abedian

Volume 3, Issue 4 , December 2006, , Pages 167-176

  Several traditional stopping criteria in Genetic Algorithms (GAs) are applied to the optimization process of a typical laminated composite plate. The results show that neither of the criteria of the type of statistical parameters, nor those of the kinds of theoretical models performs satisfactorily in ...  Read More