Loading Estimation of Flapping Wings under Aeroelastic Effect Using Finite Element Method

Hossein H. Shahverdi; A.S Nobari; H Bahrami Torabi

Volume 11, Issue 1 , June 2017

Abstract
  The aim of this paper is to provide an aeroelastic computational tool which determines the induced wing loads during flapping flight. For this purpose, a Finite Element (FE) code based on a four-node plate bending element formulation is developed to simulate the aeroelastic behavior of flapping wings ...  Read More

Active Vibration Suppression of a Nonlinear Flexible Spacecraft

M. Malekzadeh

Volume 11, Issue 1 , June 2017

Abstract
  In this article, the issue of attitude control and active vibration suppression of a nonlinear flexible spacecraft is assessed through piezoelectric patches as actuator and sensors. Two controller loops are applied: the inner loop, to make the panel vibration damped through piezoelectric patches; and ...  Read More

Airfoil Shape Optimization with Adaptive Mutation Genetic Algorithm

A. R. Jahangirian; M. Ebrahimi

Volume 11, Issue 1 , June 2017

Abstract
  An efficient method for scattering Genetic Algorithm (GA) individuals in the design space is proposed to accelerate airfoil shape optimization. The method used here is based on the variation of the mutation rate for each gene of the chromosomes by taking feedback from the current population. An adaptive ...  Read More

Robust Fixed-order Gain-scheduling Autopilot Design using State-space Stability-Preserving Interpolation

I. Mohammadzaman; H. Dehghani Firouzabadi

Volume 11, Issue 1 , June 2017

Abstract
  In this paper, a robust autopilot is proposed using stable interpolation based on Youla parameterization. The most important condition of stable interpolation between local controllers is the preservation of stability so that each local controller can ensure stability for an open neighborhood around ...  Read More

Preliminary Design of Spacecraft Attitude Control with Pulse-Width Pulse-Frequency Modulator for Rest-to-Rest Maneuvers

S.Hamid Jalali -Naini; Sh. Ahmadi Darani

Volume 11, Issue 1 , June 2017

Abstract
  In this paper, the preferred region of design parameters for quasi-normalized equations of single-axis attitude control of rigid spacecraft using pulse-width pulse-frequency modulator (PWPFM) is presented for rest-to-rest maneuvers. Using the quasi-normalized equations for attitude control reduces the ...  Read More

Local Imperfection Effects on Thermal Buckling Behavior of Composite Fiber Reinforced Truncated Conical Liner

S. Ali S.A. Hosseini Kordkheili; Z. Soltani; A. Merati

Volume 11, Issue 1 , June 2017

Abstract
  Thermal buckling behavior of truncated conical liner reinforced by laminated composite is investigated in the presence of a general initial imperfection. For this purpose, the method of virtual work and first-order strain-deformation shell theory are employed to extract equilibrium equations. To this ...  Read More