Improved Mathematical Model for Helicopters Flight Dynamics Applications

F. Saghafi; farid Shahmiri

Volume 4, Issue 3 , September 2007, Pages 1-11

  The purpose of this paper is concerned with the mathematical model development issues, necessary for a better prediction of dynamic responses of articulated rotor helicopters. The methodology is laid out based on mathematical model development for an articulated rotor helicopters, using the theories ...  Read More

Maximum Allowable Dynamic Load of Flexible 2-Link Mobile Manipulators Using Finite Element Approach
Volume 4, Issue 3 , September 2007, Pages 13-24

  In this paper a general formulation for finding the maximum allowable dynamic load (MADL) of flexible link mobile manipulators is presented. The main constraints used for the algorithm presented are the actuator torque capacity and the limited error bound for the end-effector during motion on the given ...  Read More

Assessment of the Existing Models to Estimate the Fatigue Life under both Multiaxial in Phase and 90° Out of Phase Loading Conditions

Rahmatollah Ghajar; G. R. Rashed

Volume 4, Issue 3 , September 2007, Pages 25-35

  Engineers have a range of methods to estimate the fatigue life under multiaxial conditions. Each of these predictive methods is generally subjected to restrictions, related to the inherent simplified assumptions. The objective of this paper is to evaluate the validity of commonly used multiaxial fatigue ...  Read More

Vibration and Critical Speed of Axially loaded Rotating Orthotropic Cylindrical Shells

Roohollah Talebitooti; Kamran Daneshjoo

Volume 4, Issue 3 , September 2007, Pages 37-43

  In this paper, classical thin shell theory is used to analyze vibration and critical speed of simply supported rotating orthotropic cylindrical shell. The effects of centrifugal and Coriolis forces due to the rotation are considered in the present for‌mulation.. In addition, axial load is applied on ...  Read More

Analysis of pressure distribution and optimization of working conditions during push bending of circular tubes

M. Sohankar; M. Farzin

Volume 4, Issue 3 , September 2007, Pages 45-51

  Thin-walled tube bending is still to be considered a new and advanced technique. The process has been adopted into several industries such as aero and automotive. This process may produce a wrinkling, bulking and tearing phenomenon if the process parameters are inappropriate, especially for tubes with ...  Read More