The turbine shared support structure is used widely in aeroengines, but theoretical and experimental research on a rotor-bearing system containing lacking. This paper reports into the coupling vibration response of squeeze-film-damper that has two spools with different rotation speeds supported by structure. problem addressed means tests finite-element method. Based features turboshaft engine s...

Abstract Rotating machinery supported on journal bearings is affected by forces due to rotating unbalance and pressure gradients in the oil film. The interaction of these can evoke nonlinear behaviour, including asynchronous motion even chaos. This work attempts characterise sub-synchronous rigid rotor cylindrical abovementioned interaction. analysis focuses behaviour at speeds lower than thres...

The application of magnetic bearings has become more frequent during the last 20 years and represents a significant aspect improvements in construction machines with rotary motion. With advancement technology, number applications which have found their is increasing. In this paper, it shown how effect forces can annul negative influence unbalance, suddenly appeared rotor supported active bearin...

Power quality test facilities developed at the University of Wollongong include a 10kVA waveform generator (WG) of which the detailed design and operation has been described previously. The WG is essentially a programmable IGBT voltage source inverter controlled by a micro-controller. The original intention of this generator was to test electrical equipment under the influence of harmonic disto...

− In the last years the increased interest about power quality, forced international working groups to define new standards for testing and measurement techniques. In this paper a pc-based power quality instrument is proposed, according to IEC 61000-4-7 and standard IEC 61000-4-30. It is a low-cost and easily reconfigurable instrument able to measure harmonics, interharmonics and amplitude dist...

In this paper, a control system for the operation of a doubly fed induction generator (DFIG), feeding an unbalanced three-phase load is presented. The load unbalance is compensated using the front-end converter. The control system is based on positive and negative sequence components of current. MATLAB Simulation results obtained from a DFIG system and are presented and discussed in this paper....

Abstrac t In the paper a virtual instrument for power quality measurement and research is proposed. The instrument is divided in several modules which provide generation, measurement and recording of the typical power quality (PQ) disturbances such as: harmonics, voltage dips, interruptions, flicker, unbalance etc. The virtual instrument allows setting different measurement parameters which exp...

This paper presents the practical approach to identify the rotor breakage faults in the induction motor during online condition by using current and voltage signature analysis. Special attention is focused on the effect of both space distribution of rotor breakage and rotor dissymmetry on the mechanism of generation of diagnosis signatures with the consideration of voltage supply unbalance and ...

This paper studies the effect that HOL (Head-of-Line) blocking in the packet injection queue has on the performance of bidirectional k-ary ncubes, for values of k over a certain threshold (around 20). The HOL blocking causes an unbalanced use of the channels corresponding to the two directions of bidirectional links, which is responsible for a drop in the network throughput and a rise in the ne...

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