Aerospace Science and Technology
Investigation of fin changes effects on aerodynamic performance of airship

Sahar Noori; Mohamad Saleh Afshar; Nima Karimi

Volume 14, Issue 1 , June 2021, Pages 1-10

http://dx.doi.org/10.22034/jast.2021.133173

Abstract
  Airships usually have low cruising speed due to their large volume and high drag level. This makes the aerodynamic design of the vehicle, including the surfaces shape, the length-to-diameter ratio and the position of the fins, all very important. Furthermore, an important parameter in the vehicle aerodynamic ...  Read More

Aerospace Science and Technology
Model Reference Adaptive Control Using a New Adaptation Law Based on Power-Series Quadratic Lyapunov Functions for the Single Degree of Freedom Wing Rock Phenomenon

Jafar Roshanian; Ehsan Rahimzade

Volume 14, Issue 1 , June 2021, Pages 11-29

http://dx.doi.org/10.22034/jast.2021.132822

Abstract
  In this research, new adaptation law for updating parameters of the model reference adaptive control and the model reference adaptive control with feedback integrators for a specific class of nonlinear systems with additive parametric uncertainty are presented. The innovation presented in this paper ...  Read More

Aerospace Science and Technology
Analysis of Composite Lattice Cylindrical Shells Under Transient Dynamic Loading

Ali Davar; Mahdi Mehrabani; MohammadReza Zamani; Mohsen Heydari Bani; Jafar Eskandari Jam

Volume 14, Issue 1 , June 2021, Pages 30-44

http://dx.doi.org/10.22034/jast.2021.133431

Abstract
  The composite lattice cylindrical shells are analyzed in this research while they are subjected to transient dynamic loading. The equilibrium equations for the composite cylindrical shell are expressed in terms of classical shell theory. Additionally, due to the discontinuous distribution of stiffness ...  Read More

Aerospace Science and Technology
A Study on Lean, Sweep and Chord Length Effects on Aerodynamic Performance of Axial Fan of a High-bypass ratio Turbofan Engine

Amin Sarabchi; Mojtaba Heydarian Shahri; Ali Madadi

Volume 14, Issue 1 , June 2021, Pages 45-55

http://dx.doi.org/10.22034/jast.2021.287695.1068

Abstract
  Compared to the enormous costs of laboratory experiments, numerical approaches to improving the performance of turbomachines are less costly and more practical. In the present study, by using the Taguchi method and orthogonal arrays while doing a limited number of simulations (according to the Taguchi ...  Read More

Aerospace Science and Technology
Semi-analytical solution of a three-dimensional transient response of a functionally graded annular plate with a piezoelectric layer

Pooya Yousefi Khiabani; Ali Nouri; Enayatullah Hosseinian

Volume 14, Issue 1 , June 2021, Pages 56-72

http://dx.doi.org/10.22034/jast.2021.131307

Abstract
  In this paper, a semi-analytical solution for three-dimensional transient analysis of an annular plate with piezoelectric layers is investigated. The core is a functionally graded material with an exponential distribution. This method, which is a combination of the state space method, Laplace transform ...  Read More

Aerospace Science and Technology
Optimal decision making in designing an Earth observation mission with considering the technical challenges of the platform and the impossibility of injection into the sun-synchronous orbit

Asad Saghari; Amirreza Kosari; Masoud Khoshsima

Volume 14, Issue 1 , June 2021, Pages 73-83

http://dx.doi.org/10.22034/jast.2021.308893.1100

Abstract
  This paper deals with the problem of optimal selection of orbital parameters for an Earth observation mission in the absence of the possibility of injection into sun-synchronous orbit by considering the requirements and limitations of the mission and the satellite platform. By modeling the existing relationships ...  Read More

Aerospace Science and Technology
A theoretical analysis of the influence of winding patterns on buckling load of filament wound composite pipes

Bahram Ghorbani Rezaei; Jafar Eskandari Jam

Volume 14, Issue 1 , June 2021, Pages 84-90

http://dx.doi.org/10.22034/jast.2021.132500

Abstract
   While the composite pipes and cylinders manufacture by filament wound system, there are a lot of parameters that influence on the strength and mechanical behavior of them. This various mechanical behavior causes various buckling behavior. One of the most important parameters is winding pattern ...  Read More

Aerospace Science and Technology
Critical Cavitation Number Determination of a High-speed Centrifugal Pump by Numerical Simulation of a Two-phase Flow

Ali Cheraqi; Reza Ebrahimi

Volume 14, Issue 1 , June 2021, Pages 91-102

http://dx.doi.org/10.22034/jast.2021.299823.1090

Abstract
   This paper aims to present an investigation on determining the critical cavitation number of a high-speed centrifugal pump by computational fluid dynamics. In doing so, characteristic curves of the pump used in this study were obtained in the presence and absence of cavitation. The critical cavitation ...  Read More

Aerospace Science and Technology
Experimental Investigation of using Plasma Actuators as Virtual Gurney Flap

Bahareh Mojarrad; Saeed Oveisi; Mostafa Kazemi; Mahmoud Mani

Volume 14, Issue 1 , June 2021, Pages 103-110

http://dx.doi.org/10.22034/jast.2021.297217.1085

Abstract
  The primary objective of this study was to demonstrate how plasma actuators could be used to discharge a perpendicular dielectric barrier as a virtual Gurney flap. This study utilized wind tunnel experiments on a flat plate airfoil. Each experiment is conducted at two different free flow velocities of ...  Read More

Aerospace Science and Technology
Investigating the Effect of Different Winglet Cant Angles on a Supercritical Wing Aerodynamic Efficiency at Lower Reynolds numbers

Parisa Ghanooni; Mostafa Kazemi; Mahmoud Mani

Volume 14, Issue 1 , June 2021, Pages 111-116

http://dx.doi.org/10.22034/jast.2021.297211.1084

Abstract
  This study focuses on improving performance of a supercritical wing equipped with winglets at different cant angles. This study aims to experimentally investigate the variation of aerodynamic performance of a supercritical wing of NASA Sc (2)-0410 airfoil at lower Reynolds numbers with winglets at various ...  Read More

Aerospace Science and Technology
Design of Multi-Input Multi-Output Controller for an Unmanned Aerial Vehicle by Eigenstructure Assignment Method

Ali Motamedi; Abolghasem Naghash

Volume 14, Issue 1 , June 2021, Pages 117-127

http://dx.doi.org/10.22034/jast.2021.133347

Abstract
  The purpose of this paper is to present a Multi-Input Multi-Output (MIMO) linear controller based on the eigenstructure assignment method for a fixed-wing Unmanned Aerial Vehicle (UAV) in longitudinal and lateral-directional channels. To this end, a six degree-of-freedom model of the aerial vehicle is ...  Read More

Model Predictive Fault Tolerant Control of Two-Tethered Satellite System

Mahya Ramezani; Nima Assadian

Volume 14, Issue 1 , June 2021, Pages 128-142

http://dx.doi.org/10.22034/jast.2021.134087

Abstract
  The purpose of this paper is to propose a method for the dual space tether system to continue its mission in the event of a failure by using fault-tolerant control. To accomplish this, a new and accurate model of a space tether with two tethers has been introduced, which can demonstrate the effects of ...  Read More