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

https://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

https://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

https://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

https://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

https://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

https://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

https://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

https://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

https://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

https://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

https://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

Aerospace Science and Technology
Multi-scale modeling of thermal conductivity of carbon nanotube epoxy nanocomposites- CNT

ali Vahedi; Mohammad Homayoun Sadr; Saied Shakhesi

Volume 13, Issue 2 , October 2020, , Pages 1-6

https://doi.org/10.22034/jast.2021.128047

Abstract
  Epoxy is among the most important polymers, which is extensively employed in various technologies and applications. Nevertheless, epoxy polymers present low thermal conductivities and thus the enhancement of their thermal conductivity is an important research topic. Carbon nanotubes (CNTs) owing to their ...  Read More

Aerospace Science and Technology
Numerical and Experimental Analysis of Ballistic Behaviour of Ceramic-Reinforced Al Matrix Composite Plates

Ali Ansari; Jafar Eskandari Jam; Ali Alizadeh; Mohsen Heydari Beni; Majid Eskandari Shahraki

Volume 13, Issue 2 , October 2020, , Pages 7-26

https://doi.org/10.22034/jast.2021.126370

Abstract
  This study was designed to investigate the ballistic behavior of ceramic-reinforced aluminum composite plates numerically and experimentally and to present an optimal sample design. The parameters studied were ceramic reinforcement percentage and type of matrix alloy. This study used the matrix alloys ...  Read More

Aerospace Science and Technology
Restricted Three-Body Problem Considering Perturbations of Oblate Primaries

Ehsan Abbasali; Amir reza Kosari; Majid Bakhteiari

Volume 13, Issue 2 , October 2020, , Pages 27-35

https://doi.org/10.22034/jast.2021.128013

Abstract
  In this paper, the effect of perturbations of oblate primaries in the Circular Restricted Three-Body Problem is studied, and the equations of satellite orbital motion in the Circular Restricted Three-Body Problem are developed by employing Lagrangian mechanics. Since the equations have no closed-form ...  Read More

Aerospace Science and Technology
Conceptual Design of Aeroderivative Industrial Gas Turbines

Rahman Amiri; Ali Madadi; Abolghasem Mesgarpour Tousi

Volume 13, Issue 2 , October 2020, , Pages 36-46

https://doi.org/10.22034/jast.2021.128014

Abstract
  Designing and manufacturing turbine engines have many complexities and challenges that need time and cost. Therefore, reputable companies producing gas turbines have always sought to shorten the design and construction processes, one of which is to use the core of aerial gas turbines in industrial gas ...  Read More

Aerospace Science and Technology
Investigating the Effects of Noise and Parameter Changing on Modeling of Jet Transport Aircraft

Sina Jahandari; Ahmad Kalhor; Babak Nadjar Araabi

Volume 13, Issue 2 , October 2020, , Pages 47-52

https://doi.org/10.22034/jast.2021.128049

Abstract
  This paper presents a novel approach to modeling of jet transport aircraft. Initially, basic mathematical models of jet transport are derived. Afterwards by focusing on the bank angle system of the jet transport, considering the aileron as the input, adverse methods of identification are utilized to ...  Read More

Aerospace Science and Technology
Two-Phase CFD Modeling of Three-Dimensional Supercavitating Flows

Ali Cheraghi; Reza Ebrahimi

Volume 13, Issue 2 , October 2020, , Pages 53-60

https://doi.org/10.22034/jast.2021.127995

Abstract
   One of the most effective ways of high-speed motion in water is the motion in the supercavitation regime. This way provides the possibility to avoid considerable viscose resistance of boundary layer and consequently reach to very small drag coefficient which can be several times smaller than, that ...  Read More

Aerospace Science and Technology
Design of Deterministic Self-Tuning Regulators for the Pitch Angle of an Aircraft

Sina Jahandari; Ahmad Kalhor; Babak nadjar Araabi

Volume 13, Issue 2 , October 2020, , Pages 61-65

https://doi.org/10.22034/jast.2021.128031

Abstract
  This paper addresses the adaptive control problem of an aircraft and focuses on the task that the pitch angle of the aircraft is required to follow the desired path. Considering the elevator deflection angle as the input and the pitch angle as the output, a mathematical model of the aircraft is derived ...  Read More

Aerospace Science and Technology
Analysis of Torsional Hysteresis Behavior of Shaft

Gholamreza Rashed

Volume 13, Issue 2 , October 2020, , Pages 67-72

https://doi.org/10.22034/jast.2021.127994

Abstract
   In this paper, using the Abaqus finite element software, the torsional hysteresis of X52, X60, X65 steels under loadings with different torsion values, has been numerically investigated and they are compared to each other. The shear stress, effective stress, residual stress and elastic and plastic ...  Read More

Aerospace Science and Technology
The Strategy of using porous material in liquid fuel space propulsion injectors

alireza moradi; fathollah ommi; Zoheir Saboohi

Volume 13, Issue 2 , October 2020, , Pages 73-84

https://doi.org/10.22034/jast.2021.126720

Abstract
  In the course of all-round advancement of engineering science, space research can be considered as the drivers of this forward movement. In the field of space propulsion, this trend can be seen as a backward trend, not in the sense of regression, but in the sense of optimizing the original designs used ...  Read More

Aerospace Science and Technology
A Simulation Algorithm for Staged Combustion Cycle Liquid Propellant Rocket Engines

Mahyar Naderi; Liang Guozhu; Hassan Karimi; Sara Pourdaraei

Volume 13, Issue 2 , October 2020, , Pages 85-91

https://doi.org/10.22034/jast.2021.128003

Abstract
   In order to reduce cost and time along with enhancing the safety issues, numerical computer modelling and simulations are widely used for analyzing complex systems such as launch vehicle or spacecraft propulsion system. The objective of this research is to obtain an algorithm for simulation of ...  Read More

Aerospace Science and Technology
Experimental study of the Spray Pattern of a Non-Newtonian Gelled Fluid using Two Impinging Jets

Azadeh Kebriaee; Ali Nouri -Borujerdi; Ali Darvan

Volume 13, Issue 2 , October 2020, , Pages 93-102

https://doi.org/10.22034/jast.2021.127993

Abstract
  The weaknesses of liquid propellants have led to special attention to gelled propellants in the last two decades as a way to overcome the weaknesses of these propellants. Previous studies have shown that the addition of gel-forming agents to liquid propellants converts these propellants, mainly Newtonian ...  Read More

Aerospace Science and Technology
Investigating cooperative and non-cooperative interference elimination between aircraft using game theory

Amir reza Kosari; Masoud Mirzaei Tashenizi

Volume 13, Issue 2 , October 2020, , Pages 103-113

https://doi.org/10.22034/jast.2021.127948

Abstract
  This article is aimed to investigate the interference elimination between multiple aircraft using game theory. A differential game is used to eliminate the interference if all the interfering aircraft cooperate to eliminate the interference or if each makes a rational decision based on their own interests. ...  Read More

Aerospace Science and Technology
Neural Network Backstepping control of a reentry vehicle in the presence of uncertainties

M. Khoshnood; H. Ashoori

Volume 13, Issue 1 , June 2020, , Pages 77-81

https://doi.org/10.22034/jast.2020.119916

Abstract
  In this paper, a neural network backstepping controller is designed for the control of a  reentry vehicle. The backstepping control system is applied to the nonlinear six degree of freedom dynamics of the reentry vehicle for tracking the desired input. The neural network is used for estimation of ...  Read More

Aerospace Science and Technology
Analytical and Numerical Investigation of Effective Parameters on Energy Absorption Circular Composite Tube under Internal Pressure and Axial

Milad Noorabadi; Rahnama Malihe; Ghasemi Mohammad Amin; Jafar Eskandari Jam

Volume 12, Issue 2 , October 2019, , Pages 1-9

Abstract
  In this paper the energy absorption capacity of stiffened circular composite tube is considered. The governing equations and dynamic equilibrium are first derived and then solved. Additionally, a finite element model of reinforced circular composite tube structure is modeled. At the following, the effects ...  Read More