Experimental and numerical investigation of unsteady flow around cylinder with four plates perpendicular to it with the rotational degree of freedom

Hassan Isvand; Ahmad Sharafi; Ali Salmaninejad

Volume 12, Issue 1 , March 2019, Pages 1-14

Abstract
  In this study, the behavior of a subject consisting of a cylinder with 4 plates perpendicular to it with a rotational degree of freedom under airflow both through the numerical approach, known as improved discrete vortex and experimental approach were investigated. The experimental and numerical results ...  Read More

Aerospace Science and Technology
Post-buckling response of thin composite plates under end-shortening strain using Chebyshev techniques

S. Amir M. Ghannadpour; M. Barekati

Volume 12, Issue 1 , March 2019, Pages 15-26

Abstract
  In this paper, a method based on Chebyshev polynomials is developed for examination of geometrically nonlinear behaviour of thin rectangular composite laminated plates under end-shortening strain. Different boundary conditions and lay-up configurations are investigated and classical laminated plate theory ...  Read More

Aerospace Science and Technology
Multi-objective optimization of buckling load for a laminated composite plate by coupling genetic algorithm and FEM

Mahdi Fakoor; Seyed Mohammad Navid Ghoreishi; Mohamad Aminjafari

Volume 12, Issue 1 , March 2019, Pages 27-37

Abstract
  In this paper, a combination method has been developed by coupling Multi-Objective Genetic Algorithms (MOGA) and Finite Element Method (FEM). This method has been applied for determination of the optimal stacking sequence of laminated composite plate against buckling. The most important parameters in ...  Read More

Aerospace Science and Technology
Examination of Quadrotor Inverse Simulation Problem Using Trust-Region Dogleg Solution Method

Hamidreza Jafari; Farid Shahmiri

Volume 12, Issue 1 , March 2019, Pages 39-51

Abstract
  In this paper, the particular solution technique for inverse simulation applied to the quadrotor maneuvering flight is investigated. The ‎trust-region dogleg (DL) technique which is proposed alleviates the weakness of Newton’s method used for numerical differentiation of system states in the ...  Read More

Aerospace Science and Technology
Nonlinear Vibration Analysis of Piezoelectric Functionally Graded Porous Timoshenko Beams

Enayatollah Hosseinian; Ali Nouri; Majid Zia

Volume 12, Issue 1 , March 2019, Pages 53-63

Abstract
  In this paper, nonlinear vibration analysis of functionally graded piezoelectric (FGP) beam with porosities material is investigated based on the Timoshenko beam theory. Material properties of FG porous beam are described according to the rule of mixture which modified to approximate material properties ...  Read More

Aerospace Science and Technology
A Numerical Study on the Aeroacoustic Radiation from a Finite Length Rotating Cylinder

Hamid Reza Talesh Bahrami; Sajad Ghasemlooy; hamid Parhizkar

Volume 12, Issue 1 , March 2019, Pages 65-74

Abstract
  Rotating cylinders have wide applications in different areas, especially the aerodynamic area. However, the acoustic behaviors of these components have not been widely studied. The generating noise from a spinning cylinder is mainly due to the detached vortices from the leeward of the body. In this study, ...  Read More

A Heuristic Approach for 3D-Optimization of 3-Stage Gear Train Using PSO
Volume 12, Issue 1 , March 2019

https://doi.org/10.22034/jast.2018.145654

Abstract
  Optimization the volume/weight of the gear train is more important for industries and researchers. In this paper using particle swarm optimization algorithm a general gear train is optimized. The main idea is to optimum the volume/weight of the gearbox in 3 directions. So, the optimization process based ...  Read More