An Analysis of Helicopter Mechanical Instability

an infinite planar array of rectangular microstrip patch antenna analysis

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

Analysis of Stresses in Helicopter Composite blade in Hovering Maneuver

The main purpose of this article is the structural analysis of a composite blade of a selected helicopter. In this study, the stresses on rotors' blades caused by centrifugal forces, lift, drag and torque are analyzed. The governing equations of the structure behavior and solving processes were carried out by MATLAB software, and simulation is carried out by ABAQUS software, and they are compar...

An anthropometric analysis of Korean male helicopter pilots for helicopter cockpit design.

UNLABELLED This study measured 21 anthropometric dimensions (ADs) of 94 Korean male helicopter pilots in their 20s to 40s and compared them with corresponding measurements of Korean male civilians and the US Army male personnel. The ADs and the sample size of the anthropometric survey were determined by a four-step process: (1) selection of ADs related to helicopter cockpit design, (2) evaluati...

Mechanical Instability of Nuclear Matter

Computer simulations are used to find the trajectories of nuclear reactions in the liquidgas phase transition regime. It is found that proton induced and heavy ion induced reactions at intermediate energies enter the liquidgas transition region, albeit in different ways. Effects arising from the mechanical instability of nuclear matter are seen in the simulations, although it has not yet been d...

An Analysis of Helicopter EMS Accidents using HFACS: 2000-2012