Shaft Alignment Handbook

Piotrowski, John

doi:10.1201/9781420017878

Cited by 47 publications

(12 citation statements)

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“…Frequency spectra also depend on coupling reactions and the system's FRFs. It is also reported by [8][9] that Frequency spectra or vibration response vary for types of flexible couplings for the same misalignment condition.…”

Section: Introductionmentioning

confidence: 75%

Experimental investigation on misalignment fault detection in induction motors using current and vibration signature analysis

Kumar

Krishnan

Sarangi

2015

2015 International Conference on Futuristic Trends on Computational Analysis and Knowledge Management (ABLAZE)

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In the rotating machinery one of the commonly known reasons of vibration is misalignment of rotating shaft. In this present work experimental investigation is carried out on three phase induction motor to detect rotor misalignment. Proximity and current probes are used to monitor the vibration and current signal respectively. Fast Fourier Transform is used for signal processing. A full spectrum analysis is presented for both current signal and vibration signal to reveal the faultspecific whirl signatures. The results clearly indicate the potential and feasibility of thediscussed approach for the rotor misalignment diagnosis in a shaft/rotor system coupled with a three phase induction motor.

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Section: Introductionmentioning

confidence: 75%

Experimental investigation on misalignment fault detection in induction motors using current and vibration signature analysis

Kumar

Krishnan

Sarangi

2015

2015 International Conference on Futuristic Trends on Computational Analysis and Knowledge Management (ABLAZE)

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“…From experimental investigations on misalignment of rotor systems, frequency spectrum with series of harmonics of running speed was reported by Savedra and Ramirez [26]. This is also reported that different types of flexible coupling show different frequency composition in the vibration response of same misalignment condition [27]. It shows that mystery still surrounds the exact response of vibration for the misalignment.…”

Section: Factors Affecting Instabilitymentioning

confidence: 83%

Oil whip detection using stator current monitoring

Verma

Sarangi

Kolekar

et al. 2012

2012 IEEE Symposium on Computers &Amp; Informatics (ISCI)

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The oil whirl and oil whip phenomena have been well known since many decades. The performance of rotating machinery supported by fluid film bearings are limited by instability threshold known as oil whirl and oil whip. However, there exists confusion on the parameters that affects the stability of the system. In this study, authors investigate the onset of instability on a flexible rotor mounted on journal bearings. Result shows that misalignment is the parameter that is more responsible for the cause of instability. In this paper, authors investigate oil whirl and oil whip using Variation in rotor displacement and stator current samples during machine run up under loading condition were measured, analyzed and presented.

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“…The only common feature is that in both cases the final verification is to be carried out afloat. Designing the elastic line of the propulsion shafting of a new built ship is subject only to the constraints resulting from the physics of the very procedure, described in detail in the available literature [1,3,4,6,7,8,12,13,15]. For instance, all bearings must have reactions directed upwards; they must not be overloaded; the shafting must not transfer excessive internal forces (transverse forces and bending moment onto gearbox flange or directly-coupled engine); the greatest acceptable bearing offsets are limited by their clearance, etc.…”

Section: Discussionmentioning

confidence: 99%