Preload Effect on Nonlinear Dynamic Behavior of Aerodynamic Two-Lobe Journal Bearings

R. Rashidi; A. Karami mohammadi Karami mohammadi; F. Bakhtiari nejad Bakhtiari nejad

Volume 5, Issue 4 , December 2008, Pages 145-159

  This paper presents the effect of preload on nonlinear dynamic behavior of a rigid rotor supported by two-lobe aerodynamic noncircular journal bearing. A finite element method is employed to solve the Reynolds equation in static and dynamical states and the dynamical equations are solved using Runge-Kutta ...  Read More

Modeling and Simulation Research on Dynamics of Missiles with Deflectable Nose Control

G. Yuan

Volume 5, Issue 4 , December 2008, Pages 161-166

  The dynamic characteristics of deflectable nose missiles with rotary single-channel control were investigated in this paper. Firstly, the effective angle of attack, effective angle of sideslip and quasi-body coordinates were introduced based on the spin characteristics of the missile’s body. Secondly, ...  Read More

Analysis of a solid state wave gyroscope with thin shell cylindrical resonator and calculation of its conversion factor

Saeid Irani; M. Lashgari

Volume 5, Issue 4 , December 2008, Pages 167-174

  In this work the equations of motion of a Solid State Wave Gyroscope (SWG) with rotary thin cylindrical shell resonator is analyzed using the shell and plates elasticity theory. The gyroscope conversion factor found in this analytical study corresponds with the experimental results obtained and listed ...  Read More

Evaluation of 2-D Aeroelastic Models Based on Indicial Aerodynamic Theory and Vortex Lattice Method in Flutter and Gust Response Determination

S.A. Sina; Hassan Haddad Pour

Volume 5, Issue 4 , December 2008, Pages 180-182

  Two 2-D aeroelastic models are presented here to determine instability boundary (flutter speed) and gust response of a typical section airfoil with degrees of freedom in pitch and plunge directions. To build these 2-D aeroelastic models, two different aerodynamic theories including Indicial Aerodynamic ...  Read More

Experimental Study of Sable Crack Growth in Thin Aluminium Sheet

S. H. Hashemi

Volume 5, Issue 4 , December 2008, Pages 183-190

  Recent failure information from research teams in NASA Langley and others has shown that CTOA based fracture models calibrated on large C(T) and M(T) specimens can be transferred successfully to cracked aircraft fuselage structures for the assessment of their residual strength. A major difficulty that ...  Read More