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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A study of a rotor system with ball bearing induced non-linearities; and the development of transfer matrix techniques suitable for analysing such systems

Liew, Andrew, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW January 2003 (has links)
This thesis is concerned with enhancing analysis tools for evaluating the non-linear dynamics of rotor bearing systems and in particular those where non-linearity is likely to result in aperiodic or chaotic behaviour, such as rolling element bearing systems. The tool to be enhanced was the transfer matrix approach which has been extensively used in the past for analysing linear rotor bearing systems. However, its use for evaluating non-linear behaviour has been virtually non-existent. Hence, the major aim of the thesis is to extend transfer matrix capabilities to handle non-linear systems. To this end a harmonic balance transfer matrix technique capable of analysing non-linear systems with multiple pedestal supported bearings was first developed. However, this approach is restricted to periodic response. To enable the analysis of non-linear systems with non-periodic response and provide a stability check for the harmonic balance technique, a transient transfer matrix has also been developed. The softwares for both of these newly developed transfer matrix techniques have been successfully verified for various non-linear rotor bearing systems using an established system matrix based transient rotordynamics software as the yardstick. These developments have been published in refereed journals. To investigate systems with rolling element bearings, appropriate bearing modelling which incorporates angular contact and rolling element inertia needed to be developed and incorporated into transient analysis softwares. Theoretical results from this were compared to data obtained from an experimental test rig which was designed to represent the salient features of an F/A-18 aircraft mounted accessory drive. The rig allowed for variation of bearing preload, unbalance loading and bearing support stiffness and could be run up to 17,000rpm. Full details of the design and commissioning are presented. Results showed better agreement than linear analyses but significant differences were encountered. Errors were largely due to estimated bearing parameters, in particular bearing damping, which was found to be a sensitive variable, so that agreement between theory and experiment was mainly qualitative. Other sources of error were those associated with experimental measurement and limitations of the bearing modelling. Further improvement of the bearing model is needed if better quantitative agreement is to be obtained between the predictions and experiment.
2

A vortex wake analysis of optimum high by-pass ratio ducted fans

Janakiram, Damaraju Subramanya 12 1900 (has links)
No description available.
3

An experimental investigation of a noncontacting flexibly mounted rotor mechanical face seal

Lee, An Sung 05 1900 (has links)
No description available.
4

The rotordynamic coefficients of mechanical face seals having two flexibly-mounted rotors

Wileman, James Michael 08 1900 (has links)
No description available.
5

Dynamic analysis of eccentric mechanical face seals

Wileman, James Michael 12 1900 (has links)
No description available.
6

Real-time monitoring and control of a noncontacting mechanical face seal

Zou, Min 12 1900 (has links)
No description available.
7

'n Parametriese studie van 'n roterende stelsel met oliefilmdempers

Roberts, Johan George 16 September 2014 (has links)
M.Ing. (Mechanical Engineering) / This thesis is about the design of a suitable suspension system for a high-speed machine. Experimental parametric analyses of some aspects of the design are presented. Some rotordynamic aspects which are addressed include the following: Undamped lateral critical speed analysis in order to determine the stiffness requirements for the suspension system of the machine. Calculation of optimum damping for the rotating system and an experimental evaluation of the amount of damping on the dynamic behaviour of the machine. Design of the suspension system from a dynamics point of view. Design of a test rig to evaluate the performance of the squeeze-film damper. Experimental parametric evaluation of a squeeze-film damper without seals or oil supply groove.
8

A water-wheel generator with floating rotor

Choy, Chang-tong, 蔡祥棠 January 1984 (has links)
published_or_final_version / Electrical Engineering / Doctoral / Doctor of Philosophy
9

Whole field velocity measurements in three-dimensional periodic flows

Reddy, Urmila Chennuru 05 1900 (has links)
No description available.
10

Development and application of a generalized dynamic wake theory for lifting rotors

He, Chengjian 08 1900 (has links)
No description available.

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