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This paper deals with a system for active rotor's vibration control. A test stand Rotor-kit for testing of the effect of rotors instability has been assembled. This system enables to control journal bearings for suppressing instability caused by an oil film actively. As actuators the piezoactuators have been used. The system of Rotor-kit has been designed in order to test different types of shafts...
The transverse vibration characteristics of rigid rotor-bearing system was studied with the gyroscopic effect taken into consideration which was arosed by unsymmetrical bearings. And its transverse vibration equation considering the gyroscopic moment and fluid force was established. The stability condition for the system's vibration and critical stability rotational speed's concrete expressions were...
Based on the simple hinge crack model, the dynamic equation of a rotor containing transverse crack and initial deflection is modelled in dimensionless form, which can be applied to the vibration analysis of cracked rotor with different parameters at stationary, transient and nonlinear state. By analytical solution, the frequency components of the cracked rotor with initial deflection are compared...
This paper uses rotors in Geometric Algebra to formulate a stable adaptive identifier on the group of rigid body rotations. This identifier is intended to estimate the alignment offsets between independent sensors. The approach provides a straightforward geometric interpretation based on first-order rotor kinematics. Lyapunov theory is used to prove the stability of the identifier, and numerical simulations...
Flywheel energy storage systems (FESS) with magnetically assisted bearings are becoming an exciting alternative to traditional battery systems. However, one of the challenging problems for such systems is to suppress the gyroscopic rotation of the sensitive rotor subject to internal or external disturbances. This paper presents an optimal control strategy by incorporating cross-coupling technology...
This paper analyzes the varying mechanism of the parameters which effect the DTG (Dynamically Tuned Gyroscope) long-term stability in storage conditions. On the basis of the analysis result above, the finite element modeling (FEM) of the DTG is established according to the variation of the rotor material with the temperature. In this model, firstly the rotor centroid shift was computed with temperature...
This paper presents an algorithm for locating and design of a capacitive compensator to improve angle stabilities of synchronous machine DGs in a micro-grid. The proposed algorithm uses the notion of trajectory sensitivities to determine the sensitivity of DGs rotor angles versus the susceptance of a compensator. Then, via the sensitivity analysis of the micro-grid subsequent to a pre-specified fault,...
The nonlinear torsional vibration on rotor system driven by universal joint was studied considering both natural structure misalignment and actual error misalignment. Firstly, the equation with weakly nonlinear vibration was derived after analyzing the kinematic relation about driven shaft and driving shaft. Secondly, the periodic solution was obtained corresponding to principal resonance by multi-scale...
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