Wind power is sustainable and prevalent virtually all over the globe. However, conversion efficiency of conventional single-rotor wind turbine (SRWT) still far from satisfactory. The dual-rotor counter-rotating concept among reliable techniques used to enhance a energy device for its renowned effectiveness. This study aims investigate performance Savonius dual/twin-rotor system, particularly in...

The switched reluctance motor (SRM) benefits from its magnet-free nature, robust construction, low cost, flexible controls, and the ability to operate in harsh environments such as high temperatures pressure. It has received increasing attention for all-electric or multi-electric aircraft systems electric vehicles (EVs) compared with permanent magnet synchronous motors (PMSM) other AC some requ...

The electromagnetic performances for two current distribution methods (classical and non-classical) of a 3-phase, 24 stator slots and 16 rotor poles Switching Reluctance Machine (SRM) were compared. The three phases were excited in sinusoidal current mode. The Finite Element Model was used to predict the average torque, the total flux of each phase, the torque ripple, the self and the mutual-in...

This paper deals with the attitude motion of a dual-spin spacecraft which consists of an asymmetric rigid platform and an asymmetric rigid rotor connected together by a flexible joint. The equations of motion represent a flexible multiple-degree-of-freedom gyroscopic system with periodic coefficients due to asymmetries. The equations are analyzed for possible resonances and associated instabili...

The optimisation of a tail-sitter UAV (Unmanned Aerial Vehicle) that uses a stall-tumble manoeuvre to transition from vertical to horizontal flight and a pull-up manoeuvre to regain the vertical is investigated. The tandem wing vehicle is controlled in the hover and vertical flight phases by prop-wash over wing mounted control surfaces. It represents an innovative and potentially simple solutio...

The cantilever dual-rotor system is a typical structure of the blade output end open rotor engine and coaxial turboshaft engine. excessive unbalanced vibration coupled one main factors limiting application above type. In order to accurately describe coupling effect between dual-rotor-intermediate bearings, response analyzed, self-sensitivity coefficient proposed guide selection measuring points...

Interactional aerodynamics has been studied for counter-rotating coaxial rotors in hover. The effects of torque balancing on the performance of coaxial-rotor systems have been investigated. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, and a hybrid turbulence model. Computational results for an experimen...

This paper presents a rigorous design and optimization of an axial flux microelectromechanical systems (MEMS) brushless dc (BLDC) micromotor with dual rotor improving both efficiency and power density with an external diameter of only around 10 mm. The stator is made of two layers of windings by MEMS technology. The rotor is developed by film permanent magnets assembled over the rotor yoke. The...