http://espace.library.uq.edu.au/ The University of Queensland en Fez http://blogs.law.harvard.edu/tech/rss http://espace.library.uq.edu.au/view/UQ:272466 2012-04-09T12:11:13Z Li, Lun-Xiong og Su, Jiang-Bin og Wu, Yu og Zhu, Xian-Fang og Wang, Zhan-Guo http://espace.library.uq.edu.au/view/UQ:272465 Ag nanoparticles with two-dimensional (2D) array structure are fabricated via nanosphere lithography. The influences of Cr interlayer position and metal deposition direction on array structure are systematically studied. It is found that the structure of the 2D Ag nanoparticle array with Cr interlayer is better than that without interlayers. When the Cr interlayer is deposited on the PS mask, the tips of the acquired triangle nanoparticles are much sharper, and the area of the nanoparticle array is much larger than that in the other case. Moreover, the achieved nanoparticle array has a better uniformity and compactness in structure, and a higher binding ability to the substrate when Cr and Ag deposition direction are perpendicular to the surface of the substrate. Further absorption spectrum experiment proves the improvement of the structure and feature of the 2D Ag nanoparticle array. All these results are very crucial to the future modification and fabrication of biochemical sensors with the 2D Ag nanoparticle array. 2012-04-09T12:11:01Z Kong, Ling-Qi og Zhang, Chun-Jing og Huang, Sheng-Li og Zhu, Xian-Fang http://espace.library.uq.edu.au/view/UQ:193224 This paper presents a robust place recognition algorithm for mobile robots. The framework proposed combines nonlinear dimensionality reduction, nonlinear regression under noise, and variational Bayesian learning to create consistent probabilistic representations of places from images. These generative models are learnt from a few images and used for multi-class place recognition where classi_cation is computed from a set of feature-vectors. Recognition can be performed in near real-time and accounts for complexity such as changes in illumination, occlusions and blurring. The algorithm was tested with a mobile robot in indoor and outdoor environments with sequences of 1579 and 3820 images respectively. This framework has several potential applications such as map building, autonomous navigation, search-rescue tasks and context recognition. 2010-01-19T00:00:00Z Ramos, F. T. og Upcroft, B. og Kumar, S. og Durrant-Whyte, H. F. http://espace.library.uq.edu.au/view/UQ:253374 The basis for an intelligent decision support system for design process planning within a concurrent engineering (CE) environment is the efficient utilization and coordination of planning knowledge that resides within computerized workgroups of multidisciplinary experts. A systems approach may be taken to derive, represent, and utilize the many models of reasoning that might support a human-centric view of planning in a distributed environment. The blackboard database (BB) provides a suitable framework for utilizing these models in a structured manner by representing the planning problem as a loosely coupled hierarchy of partial problems along with the knowledge needed to progressively solve different parts of this problem. This article discusses the development of such a BB system, which is intended to provide the ability to experiment with various control and domain strategies in order to yield insight into more developed and intelligent methods to assist humans in planning the CE design process. 2011-09-27T00:00:00Z Reidsema, C. og Szczerbicki, E. http://espace.library.uq.edu.au/view/UQ:293421 Turbulence provides effective mixing of entrained fluids to a molecular scale. This has wide-ranging consequences in engineering applications, particularly in turbulent combustion, where there is a diffusive-reactive balance at these smallest, unresolved scales. Probability Density Function methods that were introduced in the 1980s have been shown to give a successful statistic prediction of turbulent mixing and reaction. However, two major issues prevent this advanced method from being widely adopted for engineering applications: the high computational cost which is related to the large number of Pope Particles involved in conventional PDF simulations; and the ongoing need for a robust code that can handle all the modelling problems in engineering applications such as complex geometry and so on. To address the abovementioned problems, a C++ implementation of the efficient sparse-Lagrangian Multiple Mapping Conditioning model based on the popular Computational Fluid Dynamics toolkit OpenFOAM is introduced here. The results for a bluff body jet mixer demonstrate the new open source combustion platform, laying a foundation for connecting the cutting edge turbulence research with real engineering simulations. 2013-03-11T15:59:30Z Ge, Y. og Sundaram, B. og Cleary, M. J. og Klimenko, A. Y. http://espace.library.uq.edu.au/view/UQ:123023 Micro bore finishing for metal and ceramic materials has been a challenge in the manufacturing industry. Unfortunately, little is understood about how to polish a micro bore and how to assess its inner wall quality because it is difficult to access the micro bore for either polishing or measurement. This article reports on a feasibility study of the abrasive flow polishing of micro bores of 260 similar to 500-mum diameters and 25 similar to 50 length/diameter ratios for both metal and ceramic materials. An abrasive flow polishing machine was designed and built with turbulent flow characteristics. Polishing of steel S45C bores of 400- and 500-mum diameters, stainless steel 304 bores of 500-mum diameter, and zirconia bores of 260-mum diameter was conducted. Surface roughness and topography of the polished inner walls of micro bores were characterized using profilometry and optical interferometry from the three-dimensional point of view. Significant reduction in surface roughness of the micro bore inner walls has been made in the polishing processes. The results indicate that it is feasible to apply the abrasive flow polishing technology for metal and ceramic micro bores of diameters of 260 mum or larger and the length/diameter ratios of 25 or higher. It is found that surface roughness of the polished micro bore inner walls decreases with an increase of the abrasive flow passes. 2008-01-25T00:00:00Z Yin, L og Ramesh, K og Wan, S og Liu, XD og Huang, H og Liu, YC http://espace.library.uq.edu.au/view/UQ:183640 The transportation noise phenomenon known as wear-type rail corrugation is a significant problem in railway engineering, that manifests as an undesirable periodic wear pattern on the contact surface of rails. Rail corrugations induce unwanted vibrations, noise and damage to vehicle and track systems. Currently the only reliable solution to corrugation is removal by grinding at significant expense to the railway operator. Recent research by the current authors has theoretically shown that uniformity in train pass speeds over a site enhances corrugation growth rate and that broadening the probabilistic pass speed distribution may be a possible method of mitigating corrugation growth. To further test these results and to quantify the expected performance, in this paper, field measured data from a site with recurrent corrugation is used to tune and validate both efficient analytical and more complex numerical corrugation growth models. In doing so, previously developed analytical predictions for growth rate under varying speed conditions are generalised to both tangent track and cornering conditions. Validation and comparison with more complex benchmarked numerical models and field measurements is therefore achieved. The effect of changing the field measured pass speed distribution is then investigated and results quantifying the expected reduction in corrugation growth rate lire presented. compared and discussed. Possible undesirable side-effects of implementing such a corrugation control strategy are also investigated. 2009-09-04T00:00:00Z Meehan, P. A. og Bellette, P. A. og Batten, R. D. og Daniel, W. J. T. og Horwood, R. J. http://espace.library.uq.edu.au/view/UQ:138689 2008-05-16T00:00:00Z Meehan, P. A. og Bellette, P. og Daniel, W. J. T. og Horwood, R. http://espace.library.uq.edu.au/view/UQ:10096 A 2.5m long glass fibre reinforced plastic composite wind turbine blade was fatigue tested by means of a mechanically operated test rig. The rig uses a crank eccentric mechanism to flex the blade by a constant displacement in the flapwise direction for each load cycle. A yearly fatigue-loading spectrum for the blades has been developed from using short-term detailed aeroelastic and wind measurements, results from a detailed finite element model of the blade and averaged long-term wind data form the Australian Bureau of Meteorology. This spectrum contained over 200 load levels covering R ratios from 0 to 0.9. An equivalent damage spectrum has been formulated to minimise the number of load levels within the spectrum without compromising the amount of damage done to the blade structure. Results of fatigue testing indicate that predictions are close to the measured fatigue life of the blade. The stress distribution in fatigue critical areas of the blade during testing was found to be similar to the expected stress distribution under normal operational condition. 2004-12-17T00:00:00Z Epaarachchi, Jayantha A. og Clausen, Philip D. http://espace.library.uq.edu.au/view/UQ:292629 2013-03-03T00:57:12Z Middleton, Alexander W. og Foerster, Hans-Juergen og Uysal, I. Tonguc og Golding, Suzanne D. og Rhede, Dieter http://espace.library.uq.edu.au/view/UQ:104075 2007-08-23T22:02:45Z Walther, J. og Radcliffe, D. F. http://espace.library.uq.edu.au/view/UQ:138108 2008-05-09T00:00:00Z Walther, J. og Radcliffe, D.F. http://espace.library.uq.edu.au/view/UQ:62939 Convergent beam Kikuchi diffraction was used to accurately determine the orientation relationships (ORs) between austenite and martensite, and between austenite and granular bainite in two Fe-Ni-Mn-C alloys. Both martensite and granular bainite have the same crystallographic characteristics with the OR: (111)(A)parallel to(101)(F), [1 (1) over bar0](A) 2.5degrees +/- 2degrees from [1 (1) over bar(1) over bar](B). 2007-08-14T00:00:00Z Zhang, MX og Kelly, PM http://espace.library.uq.edu.au/view/UQ:122681 The transformation of supercooled austenite in a commercial pipeline steel was investigated by means of continuous cooling transformation (CCT) and hot simulation experiments. Based on the obtained results, an improved thermomechanical control process (TMCP) was proposed, which could produce a mixed microstructure dominated by acicular ferrite. Results indicated that an increase in the cooling rate could improve the percentage of acicular ferrite in the final microstructure under the present experimental conditions. Furthermore, the acicular ferrite dominated microstructure could be obtained by a two stage controlled rolling in the austenite recrystallisation region plus the non-recrystallisation region and controlled cooling at a cooling rate of 30 K s(-1). 2008-01-25T00:00:00Z Zhao, MC og Shan, YY og Xiao, FR og Yang, K http://espace.library.uq.edu.au/view/UQ:122223 The transformation of super-cooling austenite in a commercial pipeline steel was investigated by measuring the continuous cooling transformation (CCT) diagram and the hot simulation test. Based on the obtained results, a thermo-mechanical control process (TMCP) has been proposed, which can obtain a mixed microstructure mainly consisted of acicular ferrite, and the detailed features of acicular ferrite are also analyzed. Results indicate that the increase of cooling rate can increase the content of acicular ferrite in the final microstructure of the pipeline steel under the present experimental conditions. 2008-01-25T00:00:00Z Zhao, MC og Shan, YY og Qu, JB og Xiao, FR og Zhong, Y og Yang, K http://espace.library.uq.edu.au/view/UQ:100814 2007-08-23T00:00:00Z Song, N. og Meehan, P. A. http://espace.library.uq.edu.au/view/UQ:228863 In a recent paper by Nie, it was claimed that there is no two-dimensional continuity of lattice planes across the invariant line. However, it is a property of an invariant line strain that any planes related by the transformation strain must exhibit continuity across the invariant line. This note indicates that the Nie's incorrect conclusion is due to his definition of the shear strain that is different from the standard matrix method. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. 2011-02-11T00:00:00Z Qiu, D. og Zhang, W.-Z. http://espace.library.uq.edu.au/view/UQ:57816 A free-piston driver that employs entropy-raising shock processes with diaphragm rupture has been constructed, which promises significant theoretical advantages over isentropic compression. Results from a range of conditions with helium and argon driver gases are reported. Significant performance gains were achieved in some test cases. Heat losses are shown to have a strong effect on driver processes. Measurements compare well with predictions from a quasi-one-dimensional numerical code. 2007-08-13T16:55:11Z Kendall, MA og Morgan, RG og Jacobs, PA http://espace.library.uq.edu.au/view/UQ:187876 2009-11-25T00:00:00Z Cao, Peng og Qian, M. og Kondoh, Katsuyoshi og StJohn, D. H. http://espace.library.uq.edu.au/view/UQ:188169 2009-11-27T14:49:19Z Cao, P. og Qian, Ma og Kondoh, K. og StJohn, D. H. http://espace.library.uq.edu.au/view/UQ:172165 2009-03-26T00:00:00Z Mundt, C. og Jacobs, P. og Boyce, R. R. og Hanneman, K. http://espace.library.uq.edu.au/view/UQ:290889 2013-02-10T00:34:37Z Ge, Y. og Cleary, M. J. og Klimenko, A. Y. http://espace.library.uq.edu.au/view/UQ:218222 2010-10-11T14:22:35Z Nguyen, Mai H. og Saha, Tapan K. og Eghbal, Mehdi http://espace.library.uq.edu.au/view/UQ:284254 2012-11-02T13:04:51Z Khashehchi, M. og Hooman, K. og Roesgen, T. og Ooi, A. http://espace.library.uq.edu.au/view/UQ:149847 2008-06-06T00:00:00Z Gillies, A. D. S. og Wu, H. http://espace.library.uq.edu.au/view/UQ:274800 The promise of extended tool life or shorter production times with the application of cryogenic coolants and high pressure emulsions during metal machining is encouraging for the widespread commercial adoption of such technologies. Many researchers have previously investigated these coolant technologies in machining and all have reported various benefits. However, until now no direct comparison of each technology has been made using consistent tooling, coolant nozzle position and cutting parameters in titanium turning. This makes industrial adoption difficult because it is still unknown which technology offers superior tool life. This work investigates the tool life and chip morphology during Ti–6Al–4V turning using each coolant with constant cutting parameters and coolant nozzle position. It is found that high pressure water based emulsion offers slightly better tool life than that achievable with cryogenic coolant, however, the most influential parameter is the coolant nozzle position. Several changes to chip morphology were observed with each coolant and these are discussed in-depth. 2012-05-28T23:18:26Z Bermingham, M. J. og Palanisamy, S. og Kent, D. og Dargusch, M. S. http://espace.library.uq.edu.au/view/UQ:203753 2010-04-20T00:00:00Z Viano, David Michael og Wells, M. og St John, David H. http://espace.library.uq.edu.au/view/UQ:8805 Two techniques for detection of boundary layer transition which employ liquid crystal coatings are compared for incompressible flow over a flat plate. Temperature sensitive liquid crystals are used to measure the characteristic increase in heat transfer coefficient through the transitional region on a uniformly heated surface. Shear sensitive liquid crystals are used to detect the high surface shear stress at the end of transition. The objective of this work was to assess the suitability of these techniques for transition detection in low speed flows. Both techniques can be used to locate transition and to obtain quantitative information about surface phenomena, but the destabilizing influence of heating in the first technique must be considered. 2006-01-03T00:00:00Z Mee, D. J. og Walton, T. W. og Harrison, S. B. og Jones, T. V. http://espace.library.uq.edu.au/view/UQ:190955 This paper compares and contrasts three different probabilistic models - Particle representations, Parzen density estimates, and Gaussian mixture models - for non-Gaussian, non-linear feature tracking, when applied to multiple autonomous vehicles using the Decentralised Data Fusion (DDF) paradigm. These probabilistic models were chosen as they are all capable of approximating the probability distributions of an ideal Bayesian filter and have different properties with regard to computational efficiency and quality of the approximation. In order to show that each model satisfy the DDF requirements of modularity, scalability and robustness, the performance of each representation is taken from a simulation for multi-sensor bearing-only tracking. Performance is evaluated in three areas: (a) mathematical accuracy and optimality of fusion for correlated information between nodes, (b) computational efficiency and accuracy of various operations in the DDF framework and (c) bandwidth requirements for communicating the representations over a wireless network. 2009-12-23T00:00:00Z Ong, Lee-Ling og Ridley, Matthew og Upcroft, Ben og Kumar, Suresh og Bailey, Tim og Sukkarieh, Salah og Durrant-Whyte, Hugh http://espace.library.uq.edu.au/view/UQ:97543 2007-08-24T00:00:00Z Boot, D og Cooper, P og St John, D. H. og Dahle, A. K. http://espace.library.uq.edu.au/view/UQ:253299 Competitive markets and the advanced needs of modern societies necessitate mastery and successful design of complex products and systems. The design management of complex products is the focus of this article. We pay particular attention to the fact that organizational communication management is central in the development of complex product design. Any template for complex systems design must pay particular attention to the coupling between product, process, and organization structures. This important coupling can be managed through the effective simulation of the product parametric structure. The complex systems design methodology presented is focused on the organizational structure design, such that the complexity and structure of the to-bedesigned product determines the essential interactions of the designers. 2011-09-26T15:53:17Z Efatmaneshnik, Mahmoud og Reidsema, Carl http://espace.library.uq.edu.au/view/UQ:8739 Calculations have been performed for the inviscid hypervelocity flow of nitrogen past a 15 degree semi-angle sharp cone at an incidence of 30 degree, at an enthalphy sufficiently high to produuce dissociation/recombination chemistry downstream of the bow shock wave. A spatially second-order-accurate EFM (Equilibrium Flux Method) scheme for the numerical solution of the inviscid Euler equations was used, combined with the Lighthill-Freeman model of the non-equilibrium ideal dissociating gas. The computations have been sued to gain an understanding fo the interaction between the ags dynamics and the finite-rate chemistry. Inviscid flow has been considered to ensure that the only physical length scales in the flow are those associated with the chemical reactions. It was found that a chemical length scale L_s, based on the local dissociation length behind the shock on the windward plane of symmetry is an important governing parameter of the flow. However, as the flow length-scale becomes large and the flow approached the limiting case of equilibrium chemistry, L_s is not the dominant chemical length-scale, particularly in the leeward flow which contains a shock-vortex structure. A simple modelling technique has been used to determine a more appropriate length scale L_r for the leeward flow, based on the equilibrium conditions behind the leeward cross-flow shock. 2006-01-27T00:00:00Z Macrossan, Michael N. og Pullin, Dale I. http://espace.library.uq.edu.au/view/UQ:165546 2009-03-02T13:35:06Z Cleary, M. J. og Kent, J. H. og Bilger, R. W. http://espace.library.uq.edu.au/view/UQ:34786 This paper describes U2DE, a finite-volume code that numerically solves the Euler equations. The code was used to perform multi-dimensional simulations of the gradual opening of a primary diaphragm in a shock tube. From the simulations, the speed of the developing shock wave was recorded and compared with other estimates. The ability of U2DE to compute shock speed was confirmed by comparing numerical results with the analytic solution for an ideal shock tube. For high initial pressure ratios across the diaphragm, previous experiments have shown that the measured shock speed can exceed the shock speed predicted by one-dimensional models. The shock speeds computed with the present multi-dimensional simulation were higher than those estimated by previous one-dimensional models and, thus, were closer to the experimental measurements. This indicates that multi-dimensional flow effects were partly responsible for the relatively high shock speeds measured in the experiments. 2007-08-13T00:00:00Z Petrie-Repar, PJ og Jacobs, PA http://espace.library.uq.edu.au/view/UQ:174454 This paper investigates the feasibility of plate-wave diffraction tomography for the reconstruction of flexural inhomogeneities in plates using the results of computer simulation studies. The numerical implementation of the fundamental reconstruction algorithm, which has recently been developed by Wang and Rose [C.H. Wang, L.R.F. Rose, Plate-wave diffraction tomography for structural health monitoring, Rev. Quant. Nondestr. Eval. 22 (2003) 1615–1622] is investigated addressing the essential effects of applying the discrete form of the Fourier diffraction theorem for solving the inverse problem as discussed by Kak and Slaney [A.C. Kak, M. Slaney, Principles of Computerized Tomographic Imaging, IEEE Press, New York, 1988] for the acoustic case, viz. diffraction limited sensitivity, influence of weak scatterer assumption, damage location and scatter field data processing in time and Fourier space as well as experimental limitations such as finite receiver length and limited views. The feasibility of the imaging technique is investigated for cylindrical inhomogeneities of various severities and relative position within the interrogation space and a normal incident interrogation configuration. The results show that plate-wave diffraction tomography enables the quantitative reconstruction of location, size and severity of plate damage with excellent sensitivity and offers the potential for detecting corrosion thinning, disbonds and delamination damage in structural integrity management applications. 2009-04-08T08:51:03Z Rohde, A. og Veidt, M. og Rose, L. R. F. og Homer, J. http://espace.library.uq.edu.au/view/UQ:201380 2010-03-31T00:00:00Z Michael Kearney og Zane Smith og McAree, Peter R. http://espace.library.uq.edu.au/view/UQ:97768 2007-08-24T00:00:00Z Taylor, J. A. og St John, D. H. http://espace.library.uq.edu.au/view/UQ:281603 2012-09-09T00:08:16Z Yu, Peng og Schaffer, G. B. og Qian, Ma http://espace.library.uq.edu.au/view/UQ:188219 Heavy mineral deposits of placer origin are mostly found as beach or dune deposits. Suction cutter or bucket-wheel dredgers are used to exploit such deposits when water is present for the maintenance of artificial channels and dredge ponds. Production reconciliation of dredge mining is a complex process because slumping of material causes mixing of material to take place amongst resource blocks during mining operations. This paper reviews the applicability of sonar technology for the determination of material losses taking place in the dredge ponds, and also reviews the applicability of radio frequency identification (RFID) tags in conjunction with sonar technology as a cost effective method to enhance dredge mine production reconciliation in the heavy minerals mining industry. 2009-11-29T00:00:00Z Samaradivakara, GVI og Kizil, M og Knights, P http://espace.library.uq.edu.au/view/UQ:107913 2007-08-27T00:00:00Z http://espace.library.uq.edu.au/view/UQ:138211 2008-05-12T00:00:00Z Townson, P. og Murthy, D.N.P. http://espace.library.uq.edu.au/view/UQ:75586 This review aims to provide a foundation for the safe and effective use of magnesium (Mg) alloys, including practical guidelines for the service use of Mg alloys in the atmosphere and/or in contact with aqueous solutions. This is to provide support for the rapidly increasing use of Mg in industrial applications, particularly in the automobile industry. These guidelines should be firmly based on a critical analysis of our knowledge of SCC based on (1) service experience, (2) laboratory testing and (3) understanding of the mechanism of SCC, as well as based on an understanding of the Mg corrosion mechanism. 2007-08-15T00:00:00Z Winzer, N. A. og Atrens, A. og Song, G. og Ghalie, E. og Dietzel, W. og Kainer, K. U. og Hort, N. og Blawert, C. http://espace.library.uq.edu.au/view/UQ:66179 A bituminous coal was pyrolyzed in a nitrogen stream in an entrained flow reactor at various temperatures from 700 to 1475 degreesC. Char samples were collected at different positions along the reactor. Each collected sample was oxidized nonisothermally in a TGA for reactivity determination. The reactivity of the coal char was found to decrease rapidly with residence time until 0.5 s, after which it decreased only slightly. On the bases of the reactivity data at various temperatures, a new approach was utilized to obtaining the true activation energy distribution function for thermal annealing without the assumption of any distribution function form or a constant preexponential factor. It appears that the true activation energy distribution function consists of two separate parts corresponding to different temperature ranges, suggesting different mechanisms in different temperature ranges. Partially burnt coal chars were also collected along the reactor when the coal was oxidized in air at various temperatures from 700 to 1475 degreesC. The collected samples were analyzed for the residual carbon content and the specific reaction rate was estimated. The characteristic time of thermal deactivation was compared with that of oxidation under realistic conditions. The characteristic times were found to be close to each other, indicating the importance of thermal deactivation during combustion of the coal studied. 2007-08-15T00:00:00Z Feng, B. og Jensen, A. og Bhatia, S. og Dam-Johansen, K. http://espace.library.uq.edu.au/view/UQ:188143 2009-11-27T13:03:01Z Ma, Jie og Qian, Ma http://espace.library.uq.edu.au/view/UQ:192537 2010-01-14T00:00:00Z Schloegel, F. og Paniagua, G. og Tirtey, S. C. http://espace.library.uq.edu.au/view/UQ:227975 The present paper presents and discusses the use of dierent codes regarding the numerical simulation of a radial-in ow turbine. A radial-in ow turbine test case was selected from published literature [1] and commercial codes (Fluent and CFX) were used to perform the steady-state numerical simulations. An in-house compressible- ow simulation code, Eilmer3 [2] was also adapted in order to make it suitable to perform turbomachinery simulations and preliminary results are presented and discussed. The code itself as well as its adaptation, comprising the addition of terms for the rotating frame of reference, programmable boundary conditions for periodic boundaries and a mixing plane interface between the rotating and non-rotating blocks are also discussed. Several cases with dierent orders of complexity in terms of geometry were considered and the results were compared across the dierent codes. The agreement between these results and published data is also discussed. 2011-02-02T00:00:00Z Ventura, Carlos og Sauret, Emilie og Jacobs, Peter og Petrie-Repar, Paul og Gollan, Rowan og Van Der Laan, Paul http://espace.library.uq.edu.au/view/UQ:253548 The design and simulation of an adaptive longitudinal control system for a Mach 8 hypersonic glider is detailed. The vehicle is equipped with two elevons for control surfaces. It is required to perform a flight-path angle pull-up manoeuvre during the reentry phase of a parabolic trajectory. This is achieved with a normal acceleration longitudinal controller. The controller uses the pole-placement technique to calculate gains in real time. The gain calculations are based on a set of error-minimised model parameters, which are a fusion of real-time measured parameters, found using recursive least squares and stored look-up table parameters. In addition, a first order filter is used to update the look-up table parameters so that future control system gain calculations are not dependent on the presence of system excitation. It is shown that such a system can provide a small performance improvement in overshoot. One fundamental problem with implementation of the system in real time is the lag between the fused parameter estimates and when such parameters are required by the autopilot. Typically the autopilot operates at a higher frequency than the fused parameter estimates and thus corrects a disturbance due to real parameter change before suitable update information is received for gain calculation. The system is suggested as a useful diagnostic tool for experimental flights of this nature, or for real-time use on a more suitable dynamic system. 2011-09-28T00:00:00Z Creagh, Michael A. og Beasley, Peter og Kearney, Michael http://espace.library.uq.edu.au/view/UQ:193077 This paper presents the design of a probabilistic model of human perception as an integral part of a decentralized data fusion system. The system consists of a team of human operators and robotic platforms, together forming a heterogenous sensor network. Human operators are regarded as information sources submitting raw observations. The observations are converted into a probabilistic representation suitable for fusion with the system's belief. The conversion is performed by a Human Sensor Model (HSM). The initial HSM is built offline based on an average of multiple human subjects conducting a calibration experiment. Since individual human operators may vary in their performance an online adaptation of the HSM is required. The network estimate is used for adaptation because the true feature state is unknown at runtime. Results of an outdoor calibration experiment using range and bearing observations are presented. Simulations show the feasibility of efficient online adaptation. 2010-01-18T00:00:00Z Kaupp, Tobias og Makarenko, Alexei og Ramos, Fabio og Upcroft, Ben og Williams, Stefan og Durrant-Whyte, Hugh http://espace.library.uq.edu.au/view/UQ:261465 2011-11-15T00:00:00Z Aminossadati, S. M. og Kargar, A. og Ghasemi, B. http://espace.library.uq.edu.au/view/UQ:149936 2008-06-06T00:00:00Z Whittle, J.