The Performance of a Sealed Squeeze-Film Bearing in a Flexible Support Structure

Holmes, R.; Dogan, M.

doi:10.1243/pime_proc_1985_199_084_02

Cited by 29 publications

(13 citation statements)

References 2 publications

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“…In the literature there are many variants of the long and short bearing approximations [4,5]. The most prominent of these variants involves the combination of the short and long pressure solutions through an empirical "end-leakage factor"  that accounts for the degree of end-sealing [5,6]. This model is popular with industry and was used recently for whole-engine analysis with 5 SFDs using IRM and RHBM [7].…”

Section: Introductionmentioning

confidence: 99%

An Investigation Into Two Alternative Approaches for the Identification of SFD Bearings for Aeroengine Analysis

Groves

Bonello

2011

Volume 6: Structures and Dynamics, Parts a and B

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Identification techniques provide a means of efficiently implementing complex nonlinear bearing models in practical turbomachinery applications. This paper considers both identification from an advanced numerical model and identification from experimental tests. Identification from numerical models is essential at the design stage, where rapid simulation of the dynamic performance of a variety of designs is required. Experimental identification is useful to capture effects that are difficult to model (e.g. geometric imperfections, compressibility and its effect on cavitation). With regard to identification from a numerical model, it was shown in a previous paper that the numerical solution of the incompressible Reynolds equation may be replicated using Chebyshev polynomial fits. Tests were performed on a simple rotor-bearing configuration incorporating an advanced numerical bearing model. The identified model was found to be able to match the accuracy of the numerical solution to the Reynolds equation while requiring a fraction of the computation time. In the present work the SFD identification scheme is applied to a realistically-sized representative wholeaeroengine model. It is shown that using recently introduced nonlinear solvers combined with the identified high accuracy bearing models it is possible to run full engine rotor-dynamic simulations, in both the time and frequency domains, at a fraction of the previous computational cost. One major drawback of the Chebyshev technique is that it is not amenable to experimental identification of actual bearings. For this reason, a second identification approach, involving the use of neural networks, is considered in this paper. A test rig that enables empirical identification of SFD forces has been constructed and details of the building and operation of the test rig is presented. The method used to ascertain the training data required by the neural network identification scheme, is also described. Downloaded From: http://proceedings.asmedigitalcollection.asme.org/ on 03/30/2015 Terms of Use: http://asme.org/terms y J J J J J y

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Section: Introductionmentioning

confidence: 99%

An Investigation Into Two Alternative Approaches for the Identification of SFD Bearings for Aeroengine Analysis

Groves

Bonello

2011

Volume 6: Structures and Dynamics, Parts a and B

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“…Since Cooper's investigation, the adoption of the SFD for turbo-machinery has increased, extending its application from the original field of aircraft turbine engines to industry. In most aero-engine applications, the purpose of squeeze-film damper is to introduce damping as a series element between the outer race of a rolling element bearing and its rather flexible housing, so that the rotor can safely negotiate any critical speeds and operate smoothly at higher speeds [3]. The vast investigations performed on SFDs have shown that damper force response is greatly influenced by conditions such as: oil feed mechanisms, end seals to restrict axial leakage, levels of inlet (supply) pressure and cavitation pressure of the lubricant, coupling of the damping device to the rotor system, and, in some circumstances, fluid inertia effects.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Dynamic Response of Squeeze Film Dampers Made of Steel and Glass/Epoxy

Faris

Khalid²,

Albagul³

et al. 2007

Shock and Vibration

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This work is devoted to the fabrication and investigation of the Squeeze Film Dampers (SFDs) which are widely used in many applications. This include the fabrication of a test rig and several dampers with different sizes and two different materials which composite and non-composite. Composite dampers (Glass/epoxy), each consists of 30 layers, were fabricated by hand lay-up method. Outer and inner diameters of all the fabricated dampers were maintained as 60 and 40 mm respectively. Non-composite dampers (Steel) were fabricated and tested using turning machine. Three dampers of different lengths were examined for both materials. A rotor-bearing system for the analysis has been designed and fabricated. The test rig consists of mild steel shaft, two supports, oil pressure system, and two self-alignment ball bearings were fixed on each end support. Two squeeze film dampers were used for the two support ends. Vibration amplitude has been examined for all the fabricated dampers at different shaft rotational speeds. The first resonance speed was examined for all the dampers tested. Results show that the vibration amplitude of the steel damper was lower than Glass/epoxy dampers with the same L/D ratio. On the other hand, a considerable weight saving has been achieved by using Glass/epoxy composite dampers. It has been found that the performance of squeeze film damper improved with increasing length/diameter ratio (L/D) within the range tested.

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“…To take advantage of the innovations in the ®eld of parallel or vector processing, various attempts have been made to quasi-linearize the squeeze-®lm forces [6,7]. To take advantage of the innovations in the ®eld of parallel or vector processing, various attempts have been made to quasi-linearize the squeeze-®lm forces [6,7].…”

Section: Introductionmentioning

confidence: 99%

A theoretical and experimental investigation into the vibration response of a flexible rotor and squeeze-film damper assembly

Siew

Hill

Holmes

et al. 2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents two e cient methods to calculate the unbalance vibration response of ā exible rotor provided with a squeeze-®lm damper (SFD) with retainer springs. Both methods are iterative and combine the harmonic balance and receptance approaches. The ®rst method, called the modi®ed iteration method (MIM), is suitable for predicting the three-dimensional mode shapes of a concentric SFD±rotor system. The second method, called the modi®ed harmonic balance method (MHBM), is developed to calculate the non-linear vibration response of a¯exible shaft provided with either a concentric or eccentric SFD. The system is also investigated experimentally under diVerent conditions. The predictions computed by these methods are compared with experimental measurements and reasonably good agreement is obtained.

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The Performance of a Sealed Squeeze-Film Bearing in a Flexible Support Structure

Cited by 29 publications

References 2 publications

An Investigation Into Two Alternative Approaches for the Identification of SFD Bearings for Aeroengine Analysis

An Investigation Into Two Alternative Approaches for the Identification of SFD Bearings for Aeroengine Analysis

Experimental Investigation of the Dynamic Response of Squeeze Film Dampers Made of Steel and Glass/Epoxy

A theoretical and experimental investigation into the vibration response of a flexible rotor and squeeze-film damper assembly

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