In this paper, a computational fluid dynamics simulation method is developed to study the influence of rotor overlapping azimuth on aerodynamic performance compound coaxial helicopter. The verified by comparing numerical results with wind tunnel experiment data NASA rotor. Two azimuths upper and lower blades are considered, isolated helicopter in hover forward analyzed respectively. State 1 mea...

This article systematically compares two axial flux permanent magnet machines designed for a university student racing car application: double-rotor single-stator yokeless and segmented armature (YASA) structure, single-rotor configuration. Both are optimized minimum loss active weight using three-dimensional finite element analysis the highest performing candidate designs compared in more deta...

The detection of broken rotor bars in three-phase squirrel cage induction motors by means of current signature analysis is presented. In order to diagnose faults, a Neural Network approach is used. At first the data of different rotor faults are achieved. The effects of different rotor faults on current spectrum, in comparison with other fault conditions, are investigated via calculating Power ...

A nano coaxial rotor was designed, fabricated and studied experimentally at an ultralow Reynolds number ranging from 5000 to 20,000. The Minimum Induced Loss theory was employed to optimize the geometry of nano coaxial rotor with the introduction of weights to take into account the interference of upper rotor and lower rotor. The chord and twist distributions of both rotors were achieved as a r...

This work deals with effects of asymmetric stiffness on the dynamic behaviour of the rotor system. The analysis is presented through an extended Lagrangian Hamiltonian mechanics on the asymmetric rotor system, where symmetries are broken in terms of the rotor stiffness. The complete dynamics of asymmetries of rotor system is investigated with a case study. In this work, a mathematical model is ...

This thesis investigates quantum transport in the energy space of two paradigm systems of quantum chaos theory. These are highly excited hydrogen atoms subject to a microwave field, and kicked atoms which mimic the δ−kicked rotor model. Both of these systems show a complex dynamical evolution arising from the interaction with an external time-periodic driving force. In particular two quantum ph...