Mechanical Engineering conference papers
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Item Metadata only The flow field within an axi-symmetric nozzle utilising a large abrupt expansion(International Academic Publishing, 1992) Nathan, G.; Luxton, R.; International Conference on Experimental Fluid Mechanics (1st : 1991 : Chengdu, China); Zhuang, F.G.Item Metadata only NOx reduction in flames by modification of turbulence with jet precession(The Institute of Energy, 1993) Nathan, G.; Brumale, S.; Proctor, D.; Luxton, R.; International Conference on Combustion & Emissions Control (1st : 1993 : Cardiff, UK)Item Metadata only The role of process and flame interaction in reducing NOx emissions(The Institute of Energy, 1995) Nathan, G.; Manias, C.; International Conference on Combustion and Emissions Control (2nd : 1995 : London, UK)Item Metadata only Fast deconvolution in a shallow water environment: Time reversal or equalisation?(International Institute of Acoustics and Vibration, 2000) Cazzolato, B.; Nelson, P.; Joseph, P.; Brind, R.; International Congress on Sound and Vibration (7th : 2000 : Garmisch-Partenkirchen, Germany); Guidati, G.; Hunt, H.; Heller, H.Item Metadata only Modelling of virtual cells for dynamic manufacturing environs - an overview(Professional Engineering Publishing Ltd, 2000) Bajic, Mirko M.; Baines, Keith; School of Mechanical EngineeringItem Metadata only Long life variable amptitude fatigue strength of plate girders with welded attachments(The Welding Technology Institute of Australia (WTIA), 2000) Sakano, M; Wahab, Muhammad Abdul; School of Mechanical EngineeringItem Metadata only Extremely low cycle fatigue cracking in steele bridge piers under sysmic loading(The Welding Technology Institute of Australia (WTIA), 2000) Sakano, M; Wahab, Muhammad Abdul; School of Mechanical EngineeringItem Metadata only Stress development of pipeline girth welds(The Welding Technology Institute of Australia (WTIA), 2000) Dunstone, Alexander John; Wahab, Muhammad Abdul; Painter, M. J.; School of Mechanical EngineeringItem Metadata only Active vibration isolation using force and velocity as cost functions - experimental results(International Institute of Sound and Vibration, 2000) Howard, C.; Hansen, C.; The 7th International Congress on Sound and Vibration (4 Jul 2000 : Garmisch-Partenkirchen, Germany); Guidati, G.; Hunt, H.; Heller, H.Item Metadata only Virtual energy density sensing in active noise control systems(International Institute of Sound and Vibration, 2000) Kestell, C.; Cazzolato, B.; Hansen, C.; International Congress on Sound and Vibration (7th : 2000 : Garmisch-Partenkirchen, Germany); Guidati, G.; Hunt, H.; Heller, H.Item Open Access Pressure fluctuations on cylinders with thick turbulent boundary layers in axial and near-axial flows(ADELAIDE UNIVERSITY, 2001) Berera, F.; Bull, M.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.Item Metadata only On the mechanisms of wake-body interactions in a tandem array of two square cylinders(ADELAIDE UNIVERSITY, 2001) Lai, K.; Bull, M.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.Item Metadata only A new full adaptive algorithm for active noise control in the presence of acoustic feedback(The International Institute of Acoustics and Vibration, 2001) Qiu, X.; Hansen, C.; International Congress on Sound and Vibration (8th : 2001 : Hong Kong)Item Metadata only Active noise control with virtual sensors(The International Institute of Acoustics and Vibration, 2001) Kestell, C.; Hansen, C.; International Congress on Sound and Vibration (8th : 2001 : Hong Kong)Low frequency noise can be a significant problem in small vehicular interiors and the required size and mass of any effective passive treatment depends upon the wavelength of the noise that is to be reduced. Consequently, a low frequency noise problem in such an environment requires large, space-intrusive control elements. Active noise control (ANC) is a potential solution for this low frequency noise problem and can be used in conjunction with passive noise control at higher frequencies, so that noise can be attenuated over a broad frequency range. Although ANC can significantly reduce low frequency noise at an error sensor location in an enclosed space, the zone of attenuation may be so small that a nearby observer might not experience any improvement at all. Using an energy density error sensor, rather than a simple microphone error sensor, can increase the size of the attenuation zone, so that the observer becomes enveloped in the region of reduced noise. However, the maximum attenuation is still likely to occur at the error sensor location, so it may be preferable to reduce the noise specifically at the observer location, by using either a "virtual microphone or a virtual energy density sensor". By extrapolating the signal from a number of remote microphones, either pressure or energy density can be estimated at the observer location and hence minimised. The extrapolation method also has the potential to adapt to environmental changes and observer movements. Here, the concept will be introduced and the performance of the virtual sensors demonstrated for a small aircraft cabin.Item Open Access A mechanism for jet precession in axisymmetric sudden expansions(ADELAIDE UNIVERSITY, 2001) Kelso, R.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.A new model describes the flow pattern within a fluidic precessing jet chamber. The model offers a simple explanation of the precessing jet flow and the mechanism which produces the precession. The model is used to derive an equation relating the Strouhal number of precession to the chamber geometry.Item Metadata only Model and full scale measurements of response to wind action of a slender tall square concrete tower(2001) Melbourne, William H.; Cheung, John C. K.; Asia-Pacific Conference on Wind Engineering (5th : 2001 : Kyoto, Japan); School of Mechanical EngineeringItem Open Access Phase averaged velocity field within a fluidic precessing jet nozzle(ADELAIDE UNIVERSITY, 2001) Wong, C.; Lanspeary, P.; Nathan, G.; Kelso, R.; O'Doherty, T.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.Item Open Access Energy harvesting eel(ADELAIDE UNIVERSITY, 2001) Allen, J.; Techet, A.; Kelso, R.; Smits, A.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.Experiments were performed to investigate the possibility of using flexible piezoelectric membranes as power generation devices in the ocean. These membranes are excited by the von Kármán vortex street forming behind a bluff body. Experiments show a number of flow regimes, ranging from poorly coupled, where the membrane essentially acts as splitter plate and suppresses vortex shedding, to an optimally coupled state, where the membrane oscillates at the natural frequency of the undisturbed wake. The details of the interaction between the wake vortices and the membrane are studied using Particle Image Velocimetry and interpreted using topological concepts.Item Open Access Pressure field calculation in flow simulation by discrete vortex method(ADELAIDE UNIVERSITY, 2001) Lai, K.; Bull, M.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.In numerical simulations of fluid flow by discrete-vortexmethods, the natural processes of vorticity creation at solid boundaries and vorticity evolution in the flow domain are directly modelled. The governing equations are formulated in terms of vorticity, with the pressure terms eliminated. The calculations then yield directly the evolution of the vorticity field. From the vorticity field, streamlines and pressure fields are readily obtainable. The derivation of the pressure field involvese valuation of the time-rate of change of the velocity potential resulting from variation with time of the surface-vorticity on solid boundaries. The velocity potential, and hence the pressure,can formally have physically-inadmissible multiple values.Numerical procedures for the derivation of the pressure field from the vorticity field are detailed, which prevent the occurrence of multiple values or discontinuities in the calculated pressure.Item Open Access Preliminary study of oscillating triangular jets(ADELAIDE UNIVERSITY, 2001) Lee, S.; Lanspeary, P.; Nathan, G.; Kelso, R.; Mi, J.; Australasian Fluid Mechanics Conference (14th : 2001 : Adelaide, Australia); Dally, B.A visualisation experiment and measurements with a Pitot probe show that fluidic instability of a partially confined triangular jet can produce a continuously oscillating flow. The device which produces this flow consists of a triangular inlet orifice expanding into a short axisymmetric chamber with an exit lip. These oscillations occur over a wide range of chamber lengths and expansion ratios. The amplitude of oscillation and the initial spreading angle of the jet flow are much larger than that of a simple jet flow. The external oscillating jet has preferred azimuthal directions which are aligned with the corners of the triangular orifice. The energy loss coefficient of these jets is significantly lower than what can be achieved from a precessing circular jet.