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Author

J. Tonnesen

Bio: J. Tonnesen is an academic researcher from Technical University of Denmark. The author has contributed to research in topics: Bearing (mechanical) & Displacement (fluid). The author has an hindex of 3, co-authored 3 publications receiving 108 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the squeeze-film damper, undergoing a whirl orbit as may be caused by rotor unbalance, resists eccentricity of the whirl motion with a static stiffness which is proportional to the dynamic force carried by the squeeze film.
Abstract: The squeeze-film damper, undergoing a whirl orbit as may be caused by rotor unbalance, resists eccentricity of the whirl orbit with a static stiffness which is proportional to the dynamic force carried by the squeeze-film. In addition, the fluid film force would develop nonsynchronous components. The short bearing analysis is applied to treat this problem. Implications regarding the unbalance dynamics of a rigid rotor in the presence of a static load are examined.

11 citations


Cited by
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Journal ArticleDOI
01 Sep 2010
TL;DR: In this paper, the authors summarize advances in analytical and numerical modeling, draw attention to the thermodynamic aspects of cavitation, and reflect on physical or experimental observations while reflecting on physical and experimental observations.
Abstract: Even though the list of references associated with this review is rather extensive, in no way does it exhaust the vast literature dedicated to the study of cavitation. The intent was to summarize (i) advances in analytical and numerical modelling, (ii) draw attention to the thermodynamic aspects of cavitation, and (iii) do so while reflecting on physical or experimental observations.

166 citations

Journal ArticleDOI
TL;DR: Major emphasis is given to vibration-based identification methods and the review encompasses descriptions of experimental measurement techniques, mathematical modeling, parameter extraction algorithms and uncertainty in the estimates applied to a variety of bearings.
Abstract: In this paper, we present a review of the experimental identification of dynamic parameters of bearings in a rotating machine. Major emphasis is given to vibration-based identification methods and the review encompasses descriptions of experimental measurement techniques, mathematical modeling, parameter extraction algorithms and uncertainty in the estimates applied to a variety of bearings. The parameter extraction algorithms include the descriptions of governing equations of the rotor-bearing system and identification methods in both time and frequency domains. The identification techniques have been classified based on methods used to excite the system. The review includes a variety of bearings and similar components, which play an active link between the rotating and stationary parts of a machine. Based on the state of the art in bearing identification, conclusions are made and future directions are suggested.

127 citations

Journal ArticleDOI
TL;DR: A survey of important papers pertaining to thermal effects in journal bearings is presented in this article, which includes theoretical, computation, and experimental works pertaining to heat effects of journal bearings published in various technical journals.
Abstract: This Paper presents a survey of important papers pertaining to thermal effects in journal bearings. It includes discussions on theoretical, computation, and experimental works pertaining to heat effects in journal bearings published in various technical journals. Presented at the 4191 Annual Meeting in Toronto, Ontario, Canada May 12–15, 1986

101 citations

Journal ArticleDOI
TL;DR: In this article, an experimental assessment of a journal bearing with either one or two axial grooves located perpendicularly to the load line was performed, and it was found that under heavy loaded operation the twin groove configuration might actually deteriorate the bearing performance when compared with the single groove arrangement, namely due to uneven lubricant feed through each groove.

57 citations

Journal ArticleDOI
TL;DR: This survey discusses the previous literature reviews on model reduction, reduction methods applied to rotor systems, the current state of these reduction methods in rotor dynamics, and the ability of the literature to reduce the complexities of large order rotor dynamic systems but allow accurate solutions.
Abstract: The focus of this literature survey and review is model reduction methods and their application to rotor dynamic systems. Rotor dynamic systems require careful consideration in their dynamic models as they include unsymmetric stiffness, localized nonproportional damping, and frequency-dependent gyroscopic effects. The literature reviewed originates from both controls and mechanical systems analysis and has been previously applied to rotor systems. This survey discusses the previous literature reviews on model reduction, reduction methods applied to rotor systems, the current state of these reduction methods in rotor dynamics, and the ability of the literature to reduce the complexities of large order rotor dynamic systems but allow accurate solutions.

56 citations