Mechanical Engineering conference papers
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Item Metadata only 2D Shaped sensors for feedback control(2001) Kidner, M.; Johnson, M.; International Congress and Exhibition on Noise Control Engineering (2001 : Hague, Netherlands)Item Metadata only 3D stockpile modelling to improve the quality control in iron ore handling(Avestia, 2014) Zhao, S.; Lu, TF, D.; Koch, B.; Hurdsman, A.; 1st International Conference on Mining, Material and Metallurgical Engineering (MMME'14) (11 Aug 2014 - 12 Aug 2014 : Prague, Czech Republic)This paper describes a 3D stockpile modelling algorithm to improve quality control and increase operational efficiency in iron ore handling. The 3D model, generated from real measuring data, approximates a stockpile using a group of 3D volumetric element, which able to store information inside it, such as quality compositions of the ore. By associating this model with the cutting geometry of a real reclaimer, the quality of reclaimed material can be calculated and it is then possible to adjust the reclaiming according to the end objective with an optimised and continuous machine movement. This will help convert the current reactive and discontinuous reclaiming procedure into a proactive and unbroken mode. The proposed modelling algorithm was tested on a scaled down stockpile model and results demonstrate good, precise and fast performances.Item Metadata only 4+1>3+2?(AAEE, 2009) Kestell, C.; Arjomandi, M.; Dally, B.; Grainger, S.; Blazewicz, A.; Australasian Association for Engineering Education Conference (20th : 2009 : Adelaide, South Australia)The focus of engineering education has dramatically changed in Europe as a direct result of the Bologna process. While the intention of this was to create a more uniform educational system, another outcome has been that professional engineers are now expected to graduate with a Masters Degree rather than a Bachelors Degree. The University of Melbourne has been the first Australian university to proactively approach this issue by introducing the Melbourne Model, which comprises of a three (not four!) year Bachelors Degree (not a BEng!) followed by a two year Masters Degree (3+2). In an environment conditioned to focus on the quality of undergraduate programs, one initial reaction might be that the degree has been watered down. However, this is far from the case because the emphasis is clearly on the students completing five years of study in total. Melbourne University has in fact raised the bar. Never-the-less, their decision to proceed along this pathway has been perceived as risky and expensive, with few Australian universities following as a result. However, there is a real need to refocus on Masters Programs if our graduating students are to be formally recognised globally as world leaders in their professional capacity. The Faculty of Engineering Computing and Mathematical Sciences (ECMS) at the University of Adelaide will therefore introduce an alternative pathway to Masters in 2010, requiring only one additional year of study upon the successful completion of a four-year Bachelor of Engineering degree. This paper is very much a show and tell work in progress, with only very early indicators of the program’s potential success. While it is believed that there are a number of advantages to the Adelaide Four plus One Model, these are not presented as a better option, but simply as an option. Four plus one programs may be perceived as a long-term solution, or even a transitional solution towards a three plus two. Regardless of the preferred pathway, Australian Universities must now prepare for the obviously imminent refocusing of our educational system towards Masters Programs.Item Metadata only 6 degrees of freedom (DOF) maritime robotic simulation framework(IEEE, 2010) Tan, K.; Anvar, A.; Lu, T.; International Conference on Control, Automation, Robotics and Vision (2010 : Singapore)Testing and gauging Autonomous Underwater Vehicle (AUV) missions through observations and experimental trials prove to be time consuming and costly. A system capable of verifying the AUV control models prior to practical test is needed. One of the key aspects in the presented framework is AUV modeling which mainly covers the area of AUV dynamics. Based on this designed simulation framework, custom scenarios provided by the user can be modeled and its corresponding 6DOF dynamics can be observed. The simulation framework is built based on a developed AUV test-bed which was jointly upgraded by DSTO and the University of Adelaide.Item Restricted A biologically inspired facilitation mechanism enhances the detection and pursuit of targets of varying contrast(IEEE, 2014) Bagheri, Z.; Wiederman, S.; Cazzolato, B.; Grainger, S.; O'Carroll, D.; 16th International Conference on Digital Image Computing: Techniques and Applications (DICTA) (25 Nov 2014 - 27 Nov 2014 : Wollongong, NSW)Many species of flying insects detect and chase prey or conspecifics within a visually cluttered surround, e.g. for predation, territorial or mating behavior. We modeled such detection and pursuit for small moving targets, and tested it within a closed-loop, virtual reality flight arena. Our model is inspired directly by electrophysiological recordings from ‘small target motion detector’ (STMD) neurons in the insect brain that are likely to underlie this behavioral task. The front-end uses a variant of a biologically inspired ‘elementary’ small target motion detector (ESTMD), elaborated to detect targets in natural scenes of both contrast polarities (i.e. both dark and light targets). We also include an additional model for the recently identified physiological ‘facilitation’ mechanism believed to form the basis for selective attention in insect STMDs, and quantify the improvement this provides for pursuit success and target discriminability over a range of target contrasts.Item Metadata only A comparative study of different physics-based approaches to modelling of piezoelectric actuators(IEEE, 2013) Miri, N.; Mohammadzaheri, M.; Chen, L.; IEEE/ASME International Conference on Advanced Intelligent Mechatronics (2013 : Wollongong, Australia)This article reviews different approaches to modelling of piezoelectric actuators (PZA). The electric charge/voltage variation causes shape deformation of piezoelectric materials. If the piezoelectric material is in contact with a structure, it has the tendency to actuate that structure; in this case, the piezoelectric material plays the role of an actuator. Piezoelectric actuators are the foremost actuators in nanopositioning, manipulating material at nano/micro metre scale, applicable in Atomic Force Microscopy (AFM), highly precise manufacturing and .... In nanopositioning, displacement of piezoelectric actuators should be precisely controlled. However, the application of displacement sensors is limited by their high expense and practical constraints. Estimating displacement of piezoelectric actuators, based on their input voltage, can eliminate expensive displacement sensors from control systems. Therefore, several models have been developed to predict the displacement of piezoelectric actuators based on their input voltage. Models are basically created either merely based on data mapping, black box models, or inspired by physical phenomena, physics-based models. Physics-based models are superior in offering a clear definition of the relationship between all parts of the system dynamics. The main physics-based models are Kelvin-Voigt, Maxwell-Slip, Duhem, Preisach and Prandtl-Ishlinskii models; for each one some critical features such as rate-dependency and reversibility are addressed in this paper. This article compares the mentioned approaches and states advantages/disadvantages of each method. Parameter identification in these models is done by adhoc and non-optimal methods motivating researchers to look for alternative methods.Item Metadata only A comparison between PI & identification based inverse control for precise operation of a piezoelectric actuator for use in micro positioning application(IEEE, 2012) Minase, J.; Lu, T.; Cazzolato, B.; Grainger, S.; International Symposium on Physics and Technology of Sensors (1st : 2012 : Pune, India)Item Metadata only A comparison of adaptive feedforward control algorithms for the practical implementation of multichannel active noise control(Australian Acoustical Society, 2003) Qiu, X.; Hansen, C.; Western Pacific Acoustics Conference (8th : 2003 : Melbourne, Vic.); Don, C.Item Metadata only A comparison of popular beamforming arrays(Australian Acoustical Society, 2013) Prime, Z.; Doolan, C.; Acoustics 2013 : Science Technology and Amenity (2013 : Victor Harbor, South Australia)Victor Harbor); Terrance McMinn,Beamforming is a popular method of acoustic source localisation using an array of microphones. When beamforming over a plane or a series of planes, these microphone arrays are often two-dimensional sparse patterns of various designs. The design of these patterns is non-trivial, and influences the achievable resolution, also referred to as the beamwidth, and the Maximum Sidelobe Levels (MSL), a measure of the ability of the array to reject sources that the array is not focussed on. Although recent deconvolution techniques such as DAMAS aim to remove properties of the array from the results of beamforming, in practice the properties of the array will still influence the quality of the results. For this reason, it is important that the array exhibit good resolution and MSL for the intended beamforming application. In this paper, several popular two-dimensional array patterns such as the patented Underbrink and B&K spirals, as well as Doherty spirals and log-spirals are critically compared for both resolution and MSL for a variety of source locations, including both near-field (spherical propagation) and far-field (planar propagation) sources. Each array compared has an aperture of 1m, and uses 63 microphones in a typical arrangement found for each of the types. As array resolution scales linearly with wavelength, the resolution is calculated at a single frequency of 3 kHz, and normalised against wavelength. The MSL levels are calculated at the one-third octave band centre frequencies from 1–31:5 kHz. Results show that the Underbrink design outperforms other array patterns in both resolution and MSL over the majority of frequencies analysed.Item Metadata only A defect size estimation method based on operational speed and path of rolling elements in defective bearings(Elsevier, 2016) Moazen-ahmadi, A.; Howard, C.Abstract not availableItem Metadata only A design approach for feedback-feedforward control systems(IEEE, 2009) Mohammadzaheri, M.; Chen, L.; Behnia-Willison, F.; Aryan, P.; IEEE International Conference on Control and Automation (2009 : Christchurch, New Zealand)In this paper, a general design approach is proposed to derive the feedforward control law in feedback-feedforward control systems. This design approach is based on the concept of `control equilibrium point'. In this design approach, the feedback controller generates the transient control command and the feedforward controller generates the steady state one. Using the proposed feedforward controller, for a wide class of process plants, the stability of system is guaranteed if the feedback controller is a gain with an arbitrarily high value. That is, the only limit for the feedback (transient) control command is the actuator's practical limit; however, in this approach, a mathematical model of the system is needed to derive the feedforward control law. In order to remove this drawback, in case of having significant uncertainties, an artificial neural network, independent of mathematical model of the system, is designed to play the role of feedforward (steady state) control law.Item Metadata only A detailed tutorial for evaluating in-duct net acoustic power transmission in a circular duct with an attached cylindrical Helmholtz resonator using transfer matrix method(AAS, 2008) Singh, S.; Hansen, C.; Howard, C.; Australian Acoustical Society. Conference (2008 : Geelong, Vic.)The transfer matrix method has been extensively explored by many researchers for analysing acoustic duct systems. However, there does not exist a comprehensive source that elaborates the use of transfer matrix method for evaluating the performance of acoustic filters. The current approach describes a detailed step-by-step method for evaluating in-duct net acoustic power transmission for a harmonic plane wave travelling in a circular duct with an attached cylindrical Helmholtz resonator using the transfer matrix method. The net acoustic power transmission is evaluated using two different methods: (1) the product of acoustic pressure and acoustic volume velocity at the duct exit, and (2) estimates of the in-duct sound field using the two-microphone technique.Item Metadata only A directional event detector for conditional laser imaging(The University of Sydney, 2004) Lanspeary, P.; Lee, S.; Australasian Fluid Mechanics Conference (15th : 2004 : Sydney, Australia); Behnia, M.; Lin, W.; McBain, G.Item Metadata only A feasibility study of an automated ocean energy-recovery system for oceanic applications(IEEE, 2014) Heidari, M.; Anvar, A.; 13th International Conference on Control, Automation, Robotics and Vision (ICARCV 2014) (10 Dec 2014 - 12 Dec 2014 : Marina Bay Sands, Singapore)Oceanic energies and Oceanic wave energy in particular is one of the most reliable sources of renewable. There has been several methods introduced regarding harnessing this type of energy and as a consequence there are various mechanisms designed, each aims to convert the energy of the Oceanic wave to a useful type of energy. The gap found in the literature survey is that the current mechanisms do not function at efficiencies than higher than 40%. This paper is focused on optimising the current design of point absorber type of a wave energy converter (WEC), which is improvised to supply energy autonomously via the remote sensors deployed within an ocean, hence feeling the gap in the performance of the current sensors which are using traditional batteries, facing difficulties regarding maintenance and life span. Applications of such WEC are in every Oceanic industry or facility installed offshore on the water or on the seabed (e.g. Oil industry, Defence technologies, Chargeable small UAVs, Submarines or other similar sorts of Marine technologies)Item Metadata only A feasibility study of design and development of submersible tube launched UAV-robot(IEEE, 2014) Mansouri Pake, G.; Anvar, A.; 13th International Conference on Control, Automation, Robotics and Vision (ICARCV 2014) (10 Dec 2013 - 12 Dec 2014 : Marina Bay Sands, Singapore)This paper documents the design, development and operation of a submersible tube launched unmanned aerial vehicle (UAV) with launching capability which could be launched from an unmanned underwater robot or a submarine to begin its’ mission(s) and to be able to achieve a desired mission scenario. In the past decades, UAV-systems have become useful for a number of applications including, security, farming, search and rescue missions, safety and surveillance within critical areas or vulnerable disaster locations (e.g. Nuclear disasters, Earthquake and Tornado sites). In addition, the major mission of the UAVs within maritime environment is to determine information to support operators on critical situations. In this research study the integration of the body design concepts, deployable wings mechanisms, wing’s shapes and material selection of such UAVs has been investigated. The focus of this paper is a feasibility study on design of a small UAV-robot with capability of being launched from a tube-shaped container which would be released from an underwater launcher and to be set stable in the surface of the water before deployment.Item Metadata only A feasibility study on the design, development and operation of an automated oceanic wave surface glider robot(The Modelling and Simulation Society of Aust & NZ, 2013) Wang, Y.; Anvar, A.; Anvar, A.; Hu, E.; International Congress on Modelling and Simulation (20th : 2013 : Adelaide, South Australia); Piantadosi, J.; Anderssen, R.S.; Boland, J.As oceanic research continues to grow for scientific and commercial purposes, demand for knowledge pertaining to the ocean continues to increase. This research investigates a Wave Glider that was developed by engineers for the purpose of collecting data from oceans. The Wave Glider is a novel two-body unmanned surface vehicle (USV). Compared to traditional unmanned surface vehicles, the Wave Glider has the unique advantage of long term navigation ability. With this advantage, the vehicle can complete missions which require long-term ocean trials. This research project is focused on studying the feasibility of improving the design and operation of the Wave Glider and further developing its capabilities. To obtain real-time data, a scale model based on the original Wave Glider design has been manufactured. Improvement to the original design has already been achieved with regards to improving the stability of the wings. Based on a literature review, some concern was found over its robustness when trialing and this is addressed in this paper. Throughout this research, Computational Fluid Dynamics (CFD) analysis has been done on the Wave Glider to ensure optimum efficiency. Furthermore, CAD design of the scaled model has been reviewed to ensure success in manufacturing and operation. The Wave Glider model will be used to collect real time data for comparison with simulated data. Additional improvements included in the model will also be discussed.Item Metadata only A funny thing happened on the way to the lectern(Auckland University of Technology, 2006) Kestell, C.; Missingham, D.; Australasian Association for Engineering Education Conference (17th : 2006 : Auckland University of Technology); Rowe, G.; Reid, G.Item Metadata only A genetic approach on the PID control of VCM for auto-focusing laser probe(Trans Tech Publications Ltd, 2005) Torng, J.; Fan, K.; Lu, T.; International Conference on Advanced Manufacture (2005 : Taipei, Taiwan); Jywe, W.Item Metadata only A global non-linear control design for a PVTOL vehicle with aerodynamics(IEEE, 2005) Wood, R.; Cazzolato, B.; Halim, D.; IEEE Conference on Decision and Control (44th : 2005 : Seville, Spain); Camacho, E.Non-linear stabilisation and control of a PVTOL vehicle has received much attention in the literature for the low speed case, where aerodynamic effects can be neglected. In this paper, a non-linear control design is presented for a three degree of freedom "Hovering Rocket" with aerodynamic effects included, such that the controller remains functional at high speeds. Control design is based on a non-linear, decoupling change of coordinates presented by many authors in the past. The decoupled system is then controlled using an optimised cascade approach.Item Metadata only A hybrid control system for distributed active vibration and shock absorbers(Australian Acoustical Society, 2004) Chen, L.; Hansen, C.; Annual Conference of the Australian Acoustical Society (2004 : Gold Coast, Queensland); Mee, D.; Hooker, R.; Hillock, I.The control methods used for shock or free vibration are usually different from those for forced vibration, because shock vibration can be regarded as a type of transient vibration that is different from steady-state forced vibration. In reality, however, both steady-state and transient excitations may occur in transport vehicles, thus there is a need to control both types of vibration. To show the integration of different vibration control strategies, a hybrid control system including a distributed resonant absorber and a distributed shock absorber is proposed. The hybrid system is governed by a control arbitrator that switches a set of sensors and actuators between the two active vibration absorbers according to various external excitation conditions. The effectiveness of the integrated system is shown through simulations and experiments