Aerospace Science and Technology
A Fuzzy Fast Terminal Approach for Tracking a Probe Around an Asteroid

Mahsa Azadmanesh; Jafar Roshanian; Mostafa Hassanalian

Articles in Press, Accepted Manuscript, Available Online from 31 December 2022

https://doi.org/10.22034/jast.2022.362213.1131

Abstract
  This paper employs the fast terminal sliding mode control with the sign and the saturation function to track the landing trajectory of a probe on an asteroid and to further improve the dynamic tracking performance. Then the controller is enhanced by adding the fuzzy control to both fast terminals. To ...  Read More

Aerospace Science and Technology
The Success of the Hybrid Genetic and Particle Swarm Algorithm for a Return Spacecraft from the Atmosphere with an Optimal Trajectory Design Approach to Reduce Aerodynamic Heat Transfer

Alireza Ekrami Kivaj; Alireza Novinzadeh; farshad pazooki; Ali Mahmoodi

Articles in Press, Accepted Manuscript, Available Online from 07 May 2023

https://doi.org/10.22034/jast.2023.375858.1138

Abstract
  This study aims to investigate the spacecraft returning from the atmosphere. Due to high speed, prolonged flight duration, and numerical sensitivity, returning from the atmosphere is regarded as one of the more challenging tasks in route design. Our suborbital system is subjected to a substantial thermal ...  Read More

Aerospace Science and Technology
On the Effects of Stiffness Ratio in Nonlinear Aeroelastic Stability of a Folding Wing

Sayed Hossein Moravej Barzani; Mahdi Mortazavi; Hossein Shahverdi

Articles in Press, Accepted Manuscript, Available Online from 22 May 2023

https://doi.org/10.22034/jast.2023.396484.1149

Abstract
  In this paper, the effects caused by the combination of folding angles simultaneously with changing the stiffness ratio of different parts of a folding wing are investigated. The geometrically exact fully intrinsic equations are employed to simulated the wing nonlinear dynamic behavior. The important ...  Read More

Aerospace Science and Technology
New Guidance method for high altitude target Based on Constrained Incremental Predictive Control

Mohammad Yavari; Nemat Allah Ghahremani; Reza Zardashtti; Jalal Karimi

Articles in Press, Accepted Manuscript, Available Online from 06 June 2023

https://doi.org/10.22034/jast.2023.383679.1143

Abstract
  In this paper a new mid-course guidance algorithm for intercepting high altitude target is proposed. A part of target flight path is outside the atmosphere. The maximum acceleration command is designed as a variable constraint that varies with altitude. This physical limitation is happened for the aerodynamically ...  Read More

Aerospace Science and Technology
Integrated optimization of staging and trajectory of launch vehicles using B-spline curves

Reza Jamilnia

Articles in Press, Accepted Manuscript, Available Online from 29 July 2023

https://doi.org/10.22034/jast.2023.393426.1146

Abstract
  In this paper, in order to simultaneously optimize the staging and trajectory of launch vehicles, changes are made in the structure of the trajectory optimization problem. In this approach, the flight times of all stages are considered freely and as optimization variables. During the solution and in ...  Read More

Aerospace Science and Technology
Guidance law design for the final stage of the orbit injection problem

Morteza Sharafi; Mahdi Jafari; mojtaba alavipour

Articles in Press, Accepted Manuscript, Available Online from 05 May 2023

https://doi.org/10.22034/jast.2023.388139.1145

Abstract
  In this paper, optimal guidance law design considering fixed final state and time for the final phase a spacecraft or launch vehicle is investigated and studied. This guidance law, not only satisfied a specific optimality criterion, but it also has the least sensitivity to the initial state’s deviations; ...  Read More

Aerospace Science and Technology
Numerical Study of Flattened Miniature Heat Pipe with Hybrid Porous Wick and Double Heat Sources

G. R. Abdizadeh; Sahar Noori; Mohammad Saeedi; Hamidreza Tajik

Articles in Press, Accepted Manuscript, Available Online from 18 July 2023

https://doi.org/10.22034/jast.2023.400610.1154

Abstract
  Designing flattened miniature heat pipes (FMHPs) for electronic devices is a challenging issue due to high heat flux and limited heat dissipation space. It requires understanding the combined effects of the sintered-grooved wick structure, double heat sources, and flat thickness on heat pipes' thermal ...  Read More

Aerospace Science and Technology
Space Robots Formation Control for Large Solar Sail Deployment

Mahshid Soleymani; Maryam Kiani

Articles in Press, Accepted Manuscript, Available Online from 17 July 2023

https://doi.org/10.22034/jast.2023.404049.1157

Abstract
  Solar sails use sunlight to propel a vehicle through space by reflecting solar photons off a mirror-like surface made of light reflective material. To be able to work as an interplanetary cargo-ship, the solar sail area should be large enough to receive required acceleration from the sunlight. However, ...  Read More

Aerospace Science and Technology
Effects of harmonic control and dynamic twist on helicopter rotor performance in forward flight

Farid Shahmiri; Fatemeh Kiani

Articles in Press, Accepted Manuscript, Available Online from 08 July 2023

https://doi.org/10.22034/jast.2023.357131.1124

Abstract
  The optimum rotor blade planform of helicopters required to minimize power, maximize rotor thrust, and maximize lift-to-drag ratio in forward flight, using a numerical optimization approach, is investigated. Here, the traditional approach is modified by Central Composite Design Data (CCD) and a flight ...  Read More

Aerospace Science and Technology
Optimal Round Trip Path-Planning of An Aerial Robot by Consideration of Geometric Constraints of Obstacles

Shayan Dehkhoda; Mohammad-Ali Amiri Atashgah

Articles in Press, Accepted Manuscript, Available Online from 31 January 2023

https://doi.org/10.22034/jast.2023.326735.1112

Abstract
  This paper is dedicated to the optimal path-planning of a quadrotor to deliver the goods in the form of a round-trip mission. At first, quadrotor modeling is performed by the Newton-Euler method and then the problem is formulated as an optimal control effort problem. Then, by discretization of the equations ...  Read More

Aerospace Science and Technology
Numerical Study of the Effect of Tip Clearance and Rotor-Stator Distance on the Performance of an Axial Turbine

Amir Akbari; Hossein Khaleghi

Articles in Press, Accepted Manuscript, Available Online from 25 January 2023

https://doi.org/10.22034/jast.2023.295476.1098

Abstract
  The use of unshrouded turbine rotor blades can considerably reduce the weight of an aero engine. However, in an unshrouded high-pressure turbine, the tip leakage flow generates about 30% of the turbine total loss. Another factor which affects the loss in axial-flow turbines, is the axial distance between ...  Read More

Aerospace Science and Technology
An enhanced Lattice-Boltzmann method for speeding numerical solutions

Morteza Bayati

Articles in Press, Accepted Manuscript, Available Online from 29 July 2023

https://doi.org/10.22034/jast.2023.376159.1139

Abstract
  Minimizing the computational cost and improving the convergence speed is the main goal of any computational design. In this regard, due to the low convergence speed of the traditional iterative method of fluid flow solution, a new method to improve the traditional iterative method is applied. In this ...  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

Articles in Press, Accepted Manuscript, Available Online from 03 August 2023

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
Experimental Investigation of the Effects of Leading-Edge Serration on the Blades of Savonius Wind Turbine

Sahel Alasvand; Mostafa Kazemi; Mahmood Mani

Articles in Press, Accepted Manuscript, Available Online from 07 August 2023

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

Amirali Nikkhah; Morteza Tayefi; moein Ebrahimi; Navid Mohammadi

Articles in Press, Accepted Manuscript, Available Online from 07 August 2023

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

Benyamin Ebrahimi; Jafar Roshanian; Ali Asghar Bataleblu

Articles in Press, Accepted Manuscript, Available Online from 11 September 2023

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