In this work, a novel method to evaluate the nonlinear bearing forces is introduced. The depends on using polynomial surface fitting as function of journal center position. Then, these are used investigate stability and bifurcations an elastic rotor-bearing model. Hopf bifurcation analysis limit cycle continuation investigated proposed for obtaining un-grooved with L/D = 0.5. results compared s...

Grid frequency must be regulated in its nominal range to guarantee the stable operation of an electric power grid. Excessive grid excursions result load shedding, instability, or even synchronous generator damage. With growing wind penetration, there is increasing issue about reduction inertia response. This paper addresses a self-adaptive inertial control strategy for improving nadir and smoot...

The marine bacterium Vibrio alginolyticus has a single flagellum as locomotory organ at the cell pole, which is rotated by Na+-motive force to swim in liquid. base of flagella motor composed stator and rotor, serves power engine generate torque through rotor–stator interaction coupled Na+ influx channel. MS-ring, embedded membrane part initial structure required for assembly. It comprises 34 mo...

This paper presents the modeling of a four rotor vertical take-off and landing (VTOL) unmanned air vehicle known as the quad rotor aircraft. The paper presents a new model design method for the flight control of an autonomous quad rotor. The paper describes the controller architecture for the quad rotor as well. The dynamic model of the quad-rotor, which is an under actuated aircraft with fixed...

single-phase squirrel cage and three-phase induction electromotors are the most popular electromotors used in industry from long ago. when an induction motor starts with direct connection method, it takes a lot of current from the power supply (several times the nominal current); so, several methods have been devised to start such electromotors. these methods either reduce the voltage of the st...

Unbalance, fatigue crack and rotor-stator rub are the three common and important faults in a rotor-bearing system. They are originally interconnected each other, and their vibration behaviors do often show strong nonlinear and transient characteristic, especially when more than one of them coexist in the system. This article is aimed to study the vibration response of the rotor system in presen...