It’s been known for many years that thermal temperature gradients across a rotor can alter the amplitude and phase of synchronous vibration. This is due to bowing of the shaft caused by a temperature difference between one side of the shaft and the other. The earliest published recognition of this phenomenon was by Newkirk [1], where the temperature difference was a result of frictional heating...

This paper analyzes the electromechanical interaction in a flywheel system with a doubly fed induction machine, used for wind farm power smoothing or grid frequency response control. The grid-connected electrical machine is subject to power control, and this can cause it to produce negative damping to the shaft torsional vibration. Resonance must be prevented, and this paper proposes a solution...

This paper analyzes the effect of the fuzzy logic-controlled braking resistor (BR) on minimizing shaft torsional oscillations of the generators in a multi-machine power system. The influence of communication delay associated with the fuzzy controller input calculation on minimizing shaft torque oscillations is investigated. Global Positioning System (GPS) is proposed for the practical implement...

The study summarized the characteristics of large board and shaft components. high-end machine equipment clamping devices should be developed in machining for high requirements. Additionally, some non-conventional methods have became a increasing For measurements, developing advanced were summarized, compensation also complement to realize precision efficiency. If that component’s size has grea...

This paper describes a simple approach for integrating all the time synchronous average (TSA) signals from multiple shafts of a gearbox to generate a composite time synchronous average which can be subtracted from the original signal to generate a second-order cyclostationary residual. This approach is compared with other techniques including an all-shaft TSA over the least common multiple of s...

This paper describes the influence of rotor eccentricity synchronous reactive frequency doubler’s characteristics. Specifically, the research is concentrated on the influence of rotor eccentricity on increased frequency EMF E2 value, that is induced it stator’s secondary winding. To clarify this question the simulations by using the finite element method implemented in QuickField software, are ...

Complex rotating machine trains especially trains including electric machines are subject to the most varied and often most severe torsional disturbances. If shaft or rotating component failures occur as a result of torsional oscillations, the consequences can be catastrophic. In this paper a comprehensive model and simulation method using analytical formulations are developed to study both ste...

The paper presents control system for positioning of rotating shaft ends with magnetic bearings. Problem of identification and modelling is presented as well as control algorithms. The main difficulty of the control are disturbances caused by rotation (controlled by push-pull drivers) of the shaft. Weighted minimumvariance controller has been applied and compared with built-in PD controllers. T...

Pecan is one of the spices that become an ingredient in process food and cosmetic industry. The pecan separator machine made to facilitate speed up breaking fruit order increase work efficiency hope can achieve high form good yields. purpose this help community processing maximum its production, also productivity fruit, which improve community's economy. research method applied study experiment...