Aerospace Science and Technology
Mixed Mode (I/II/III) Stress Intensity Factors in Gas Turbine Blade Considering 3D Semi-elliptical Crack

Seyed mohammad navid ghoreishi; Nabi Mehri-Khansari; Houman rezaei

Volume 15, Issue 1 , June 2022, Pages 1-13

http://dx.doi.org/10.22034/jast.2021.294317.1077

Abstract
  Regardless of the initiation or propagation procedure of crack in a gas turbine blade, the precise expectation of the fracture behavior, such as mixed-mode Stress Intensity Factors (SIF), plays a significant role in acquiring its operational life. Therefore, multilateral three-dimensional fracture solutions ...  Read More

Aerospace Science and Technology
Numerical study on enhancement of low speed axial compressor rotor performance under radial inlet distortion via DBD plasma actuators

Ali Khoshnejad; Reza Ebrahimi; Golamhosein Pouryossefi

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2021.309899.1102

Abstract
  Aero-engine entrance conditions are not always ideal and, for various reasons, inlet distortion may occur and cause inlet blockage and reduction of compressor performance. The aim of this study was to numerically simulate the effects of plasma actuators on the enhancement of low-speed axial compressor ...  Read More

Aerospace Science and Technology
Numerical calculation of radiation heating of the hypersonic nose in the reentry phase

Sajad Ghasemlooy; mahsa dehnamaki; Hamid Parhizkar

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2021.300023.1089

Abstract
  The calculation of aerodynamic heating is one of the most important steps in designing high speed flying bodies, especially reentry bodies. Because ignoring that, it can damage the thermal protection system and cut off the radar connections to the reentry capsule. Due to the high speed of the capsule ...  Read More

Aerospace Science and Technology
Sliding mode stabilization of quad tilt-wing UAV considering nonlinear model of the vehicle and uncertainties

Mahdi Amani Estalkhkuhi; Jafar Roshanian

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.296063.1086

Abstract
  In this paper, a multi-input/multi-output sliding controller is proposed and analyzed for a quad tilt-wing unmanned aerial vehicle (QTW-UAV). The vehicle is equipped to do take-off and landing in vertical flight mode and is capable of flight over long distances in horizontal flight mode. The full dynamic ...  Read More

Aerospace Science and Technology
Developement of Vision-Based Human Tracking for Drone’s Gimbal

Mohammad Hossein Bayat; Mohammad Shahbazi; Bahram Tarvirdizadeh

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.312829.1105

Abstract
  The use of Unmanned Aerial Vehicles (UAVs) with different features and for a variety of applications has grown significantly. Tracking generic targets, especially human, using the UAV's camera is one of the most active and demanding fields in this area. In this paper we implement two vision-based tracking ...  Read More

Aerospace Science and Technology
Simulation of the effect of using a finned tube on the thermal efficiency of a Helicopter shell and tube heat exchanger.

Mohammad Reza Salimi; Mohsen Rostami; Amir Hamzeh Farajolahi; Morteza Ghanbari

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.317457.1108

Abstract
  In this paper, flow and heat transfer inside a helicopter shell and tube heat exchanger is simulated in three dimensions. This converter consists of a shell with 90 U-shaped tubes inside. For further heat transfer, the tubes were simulated and compared once without fins and again with fins, which are ...  Read More

Aerospace Science and Technology
Development of real-time aeroelastic flight simulation tool for primary design and stability analysis

Hossein Faveadi; Ali R. Davari; Farshad Pazooki; Majid Pouladian

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.246477.1036

Abstract
  Flight simulation is a powerful and usefull instrument in design, testing, evaluation and validation of aircrafts; The results of aerolastic simulation along with rigid simulation can be used in the many areas of designs, such as modification or optimization, stability analysis and evaluating field test ...  Read More

Aerospace Science and Technology
Design process of a supersonic wind-tunnel working with vapor of combined cycle power plant

hossein shadmehr; Sajad Ghasemloo; hamid Parhizkar

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.297517.1087

Abstract
  In this article, the idea of building a supersonic wind tunnel has been provided that uses a high-pressure steam flow of a combined cycle power plant. This has been investigated by CFD method. Using the plant's output steam as a high-pressure source can be used in the ejector to create supersonic airflow ...  Read More

Aerospace Science and Technology
natural periodic orbit attitude behavior of satellites in three-body problem in the presence of the oblate primaries

Amir reza Kosari; Ehsan Abbasali; Majid Bakhtiyari

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.311711.1104

Abstract
  The main purpose of this article is to examine the periodic coupled orbit-attitude of a satellite at restricted three body problem considering both primaries oblateness perturbations. The proposed model was based on a simplified coupled model meaning that the time evolution of the orbital state variables ...  Read More

Aerospace Science and Technology
Noise-Induced Miss Distance Analysis of First-Order Explicit Guidance Law

Ali Arabian Arani; S.H. Jalali Naini; mohammad hossein Hamidi nejad

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.303074.1095

Abstract
  This study presents the miss distance analysis of the first-order explicit guidance law due to seeker noise using the adjoint method. For this purpose, linearized equations are utillized and the adjoint model is developed. Then the first-order equations are obtained and converted into nondimensional ...  Read More

Aerospace Science and Technology
Adaptable Nonlinear Guidance Law Design with Respect to Initial Deviation for Booster Vertical Landing Mission

Morteza Sharafi; Nasser Rahbar; Ali Moharrampour; Abdorreza Kashaninia

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.327899.1113

Abstract
  In this study, terminal phase guidance of a vertical-landing booster has been considered. At first, dynamical equations have been derived assuming variable mass, density and gravity model. Then by considering these parameters as constants, sensitivity variables have been extracted using the vectorized ...  Read More

Static and Dynamic Analyses of Integral Pulse-Width Pulse-Frequency Modulator with Small Error-Reset Integrator Logical Circuit

S.H. Jalali Naini; omid omidi hemmat

Volume 15, Issue 1 , June 2022

http://dx.doi.org/10.22034/jast.2022.328332.1114

Abstract
  In this study, the static and dynamic analyses of a modified integral pulse-width pulse-frequency (PWPF) modulator with small error-reset integrator (SE-RI) logical circuit are carried out using grid search method. A set of quasi-normalized equations is utilized in order to reduce the number of parameters, ...  Read More