Aerospace Science and Technology
Experimental Investigation of the Effects of Leading-Edge Serration on the Blades of Savonius Wind Turbine

Sahel Alasvand; Mostafa Kazemi; Mahmood Mani

Volume 17, Issue 1 , June 2024, Pages 1-8

https://doi.org/10.22034/jast.2023.398694.1150

Abstract
  The noise of wind turbines is mainly of aerodynamic origin and is caused by the impact of the flow on the turbine blade. Therefore, improving the behaviour of the flow around the turbine and reducing aeronoise can result in reducing its annoying noise. In the first step of this research, a suitable serration ...  Read More

Aerospace Science and Technology
Guidelines on Conceptual and Preliminary Design of Hypersonic Waveriders with Different Number of Inlet Ramps

Mohammadreza Varshavi; Sahar Noori

Volume 17, Issue 1 , June 2024, Pages 11-22

https://doi.org/10.22034/jast.2023.400869.1155

Abstract
  Air-breathing hypersonic flight is presumed by many of the savants in the field of aeronautical engineering as the last boundary of aerial vehicle design to be pushed back. An auspicious design configuration for the prospective hypersonic transport vehicles of the future is a “Waverider,” ...  Read More

Aerospace Science and Technology
Ionospheric electron density reconstruction over central Europe using neural networks: A comparative study

Seyyed Reza Ghaffari-Razin; Reza Davari-Majd; Behzad Voosoghi; Navid Hooshangi

Volume 17, Issue 1 , June 2024, Pages 23-33

https://doi.org/10.22034/jast.2023.187660.1020

Abstract
  Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density image by computing Total Electron Content (TEC) values from the recorded GPS signals. Due to the poor spatial distribution of GPS stations, limitations of signal viewing angle and discontinuity of observations ...  Read More

Aerospace Science and Technology
Optimal Strategy for Multi-agent Mission Segregation: Search and Coverage Application

Benyamin Ebrahimi; Jafar Roshanian; Ali Asghar Bataleblu

Volume 17, Issue 1 , June 2024, Pages 34-46

https://doi.org/10.22034/jast.2023.403842.1156

Abstract
  Significant attention has been given to the field of multi-agent systems in recent years due to its potential to solve complex problems that cannot be addressed by a single agent. One such problem is the cooperative search and coverage application, which requires multiple agents to efficiently search ...  Read More

Aerospace Science and Technology
Design and Analysis of Supersonic Inlet for Ramjet Engines: Aerodynamic Considerations and Performance Optimization

Mohammad Hossein Moghimi EsfandAbadi; Adnan Mohammadi; Mohammad Hassan Djavareshkian

Volume 17, Issue 1 , June 2024, Pages 47-59

https://doi.org/10.22034/jast.2023.421137.1165

Abstract
  This research delves into the intricate realm of supersonic inlet design for ramjet engines, honing in on the critical aerodynamic considerations and optimization of performance factors. At Mach 2.5, the study meticulously scrutinizes pivotal design parameters, including the placement and number of inclined ...  Read More

Aerospace Science and Technology
Aerodynamic Coefficients Computation for Fixed Wing Aircrafts Using DATCOM Software with Emphasize on Rudderless Flying-Wing UAVs

Sevda Rezazadeh Movahhed; Mohammad Ali Hamed

Volume 17, Issue 1 , June 2024, Pages 60-71

https://doi.org/10.22034/jast.2023.398894.1152

Abstract
  The fixed-wing unmanned aerial vehicles (UAVs) have gained significant attention across diverse civilian and military applications in recent years, where precision control, advanced manoeuvrability, and elevated stealth capabilities are paramount. In order to design a robust control system to enable ...  Read More

Aerospace Science and Technology
Design and Comparison of MPC and LQR Control Methods for a Passenger Aircraft

Amirali Nikkhah; Moein Ebrahimi; Morteza Tayfi; Navid Mohammadi

Volume 17, Issue 1 , June 2024, Pages 72-80

https://doi.org/10.22034/jast.2023.397939.1153

Abstract
  The paper compares the performance of two altitude controllers, model predictive controller (MPC) and linear quadratic requlator (LQR), for aircraft in cruise flight and height change conditions. The design of the controllers is based on the linearized state space matrix of the aircraft’s longitudinal ...  Read More

Aerospace Science and Technology
Numerical Calculation of Fracture Parameters in Grooved Rotating Disc Containing Three-dimensional Semi-elliptical Crack Under Mixed Mode Loading

Seyed mohammad navid Ghoreishi; Bahar Salimi

Volume 17, Issue 1 , June 2024

https://doi.org/10.22034/jast.2023.398765.1151

Abstract
  In this study, a comprehensive investigation of the fracture parameters in a grooved rotating disc containing a three-dimensional semi-elliptical crack under different working conditions has been investigated. In this regard, three models of radial, circumferential and inclined crack with an angle of ...  Read More

Aerospace Science and Technology
The role of unmanned aerial vehicles in future smart cities

Ali Mirzaee kahagh; Alireza Sekhavat Benis

Volume 17, Issue 1 , June 2024

https://doi.org/10.22034/jast.2023.395152.1148

Abstract
  The current research was conducted with the aim of identifying the role of unmanned aerial vehicles in future smart cities. The current research was conducted in terms of mixed statistical methods (qualitative-quantitative). The participants of the qualitative part, which was implemented based on the ...  Read More

Aerospace Science and Technology
Optimal Path Planning of a Spacecraft via a Deep Neural Network for Soft Landing on the Irregular-Shaped 433 Eros Asteroid

Fahimeh Barzamini; Jafar Roshanian; Mahdi Jafari-Nadoushan

Volume 17, Issue 1 , June 2024

https://doi.org/10.22034/jast.2023.423239.1168

Abstract
  This paper aimed to utilize a Deep Neural Network (DNN) to achieve optimal path planning for a spacecraft during a landing mission on an asteroid. A minimum energy-consumption mission is evaluated in which a DNN is utilized to predict the optimal path in case of any failures or unforeseen alterations. ...  Read More

Aerospace Science and Technology
A Comprehensive Miss Distance Analysis of Single-Lag True Proportional Navigation

S.H. Jalali Naini; Rahim Asadi; amir hossein Mirzaei

Volume 17, Issue 1 , June 2024

https://doi.org/10.22034/jast.2024.428886.1170

Abstract
  A complete miss distance analysis of true proportional navigation is carried out due to initial heading error, step target maneuver, and seeker noise sources assuming a first-order control system using forward and adjoint methods. For this purpose, linearized equations are utilized for deterministic ...  Read More