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Indoor Localisation Using A Context-Aware Dynamic Position Tracking Model, Montserrat Ros, Joshua Boom, Gavin De Hosson, Matthew D'Souza

Faculty of Engineering - Papers (Archive)

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Indoor wireless localisation is a widely sought feature for use in logistics, health, and social networking applications. Low-powered localisation will become important for the next generation of pervasive media applications that operate on mobile platforms. We present an inexpensive and robust context-aware tracking system that can track the position of users in an indoor environment, using a wireless smart meter network. Our context-aware tracking system combines wireless trilateration with a …

Dynamic Hand Gesture Recognition System Using Moment Invariants, Zhengmao Zou, Prashan Premaratne, Malin Premaratne, Ravi Monaragala, Nalin Bandara

Faculty of Engineering - Papers (Archive)

We have developed a dynamic hand gesture recognition system that can simplify the way humans interact with computers and many other non-critical consumer electronic equipment. The proposed system is based on the well-known “Wave Controller” technology developed at the University of Wollongong and will revolutionize video gaming and consumer electronics control interfaces. Currently, computer interfacing mainly involves keyboard, mouse, joystick or gaming wheels and occasionally voice recognition for user input. These modes of interaction have restrained the artistic ability of many users, as they are required to respond to the computer through pressing buttons or moving other apparatus. Voice recognition …

Wide Dynamic Range Acquisition System For Innovative Radiation Detectors, Marco Petasecca, B Alpat, G Ambrosi, M Menichelli, A Papi, P Cirrone, F Ferrera, P Figuera, P Finocchiaro, M Lattuada, D Rifuggiato, F Bizzarri, S Blasko, Diego Caraffini, Francesca Renzi, H Denizli

Faculty of Engineering - Papers (Archive)

There is particular interest to develop low-noise and wide dynamic range data acquisition systems for silicon detectors in view of using the same acquisition readout electronics for a wide range of application fields like monitoring and characterization of radiation sources or particle beams. In the framework of a research project for the qualification of Components Off The Shelf (COTS) for their use in space, research groups from INFN-Perugia, INFN-LNS and from MAPRAD have developed a fully automated, remote controllable, wide dynamic range acquisition system for silicon strip or pixelated detectors. Its design and a basic description of the performance are …

Dynamic Conductivity Of Graphene With Electron-Lo-Phonon Interaction, Anthony Wright, Chao Zhang

Faculty of Engineering - Papers (Archive)

We calculate the electrical conductivity of single-layer graphene within the regime of massless Dirac fermions. We consider the electron-LO-phonon interactions as the dominant scattering mechanism. By using the Green’s-function method, we are able to obtain the quantitative contribution from the five leading diagrams in the high-frequency approximation. It is found that electron-LO-phonon interactions cause an increase to the electromagnetic absorption of single-layer graphene of as much as 20% at room temperature. The spectrum is dominated by a continuum contribution with a peak at ω=ω_LO/2 and represents intraband transitions. The temperature and doping dependence of these peak corrections is …

Symbolic Modelling Of Dynamic Human Motions, David A. Stirling, Amir S. Hesami, Christian H. Ritz, Kevin Adistambha, Fazel Naghdy

Faculty of Engineering - Papers (Archive)

Numerous psychological studies have shown that humans develop various stylistic patterns of motion behaviour, or dynamic signatures, which can be in general, or in some cases uniquely, associated with an individual. In a broad sense, such motion features provide a basis for non-verbal communication, or body language, and in more specific circumstances they combine to form a Dynamic Finger Print (DFP) of an individual, such as their gait, or walking pattern. A new modelling and classification approach for spatiotemporal human motions is proposed, and in particular the walking gait. The movements are obtained through a full body inertial motion capture …

In Situ Study Of Dynamic Recrystallization And Hot Deformation Behavior Of A Multiphase Titanium Aluminide Alloy, Klaus-Dieter Liss, Thomas Schmoelzer, Kun Yan, Mark H. Reid, Matthew Peel, Rian J. Dippenaar, Helmut Clemens

Faculty of Engineering - Papers (Archive)

Hot-compression tests were conducted in a high-energy synchrotron x-ray beam to study in situ and in real time microstructural changes in the bulk of a β-solidifying titanium aluminide alloy. The occupancy and spottiness of the diffraction rings have been evaluated in order to access grain growth and refinement, orientation relationships, subgrain formation, dynamic recovery, and dynamic recrystallization, as well as phase transformations. This method has been applied to an alloy consisting of two coexisting phases at high temperature and it was found that the bcc β-phase recrystallizes dynamically, much faster than the hcp α-phase, which deforms predominantly …

Hot Deformation And Recrystallization Of Austenitic Stainless Steel. Part I: Dynamic Recrystallization, A Dehghan-Manshadi, Mathew R. Barnett, P D. Hodgson

Faculty of Engineering - Papers (Archive)

The hot deformation behavior of a 304 austenitic stainless steel was investigated to characterize the evolution of the dynamically recrystallized structure as a starting point for studies of the postdeformation recrystallization behavior. The effect of different deformation parameters such as strain, strain rate, and temperature were investigated. The flow curves showed typical signs of dynamic recrystallization (DRX) over a wide range of temperatures and strain rates (i.e., different Zener–Hollomon (Z) values). However, under very high or very low Z values, the flow curves’ shapes changed toward those of the dynamic recovery and multiple peaks, respectively. The …

An Alternative Rail Pad Tester For Measuring Dynamic Properties Of Rail Pads Under Large Preloads, Sakdirat Kaewunruen, Alexander Remennikov

Faculty of Engineering - Papers (Archive)

One of the main components in ballasted railway track systems is the rail pad. It is installed between the rail and the sleeper to attenuate wheel/rail interaction loads, preventing the underlying railway sleepers from excessive stress waves. Generally, the dynamic design of tracks relies on the available data, which are mostly focused on the structural condition at a specific toe load. Recent findings show that track irregularities could significantly amplify the loads on railway tracks. This phenomenon gives rise to a concern that the rail pads may experience higher effective preloading than anticipated in the past. On this ground, this …

Simulation Of Dynamic Recrystallization Using Irregular Cellular Automata, N Yazdipour, A Dehghan-Manshadi, C H. J Davies, P D. Hodgson

Faculty of Engineering - Papers (Archive)

Computer simulation is a powerful tool to predict microstructure and its evolution during dynamic recrystallization. Cellular Automata (CA), as one of the most efficient methods proposed to simulate recrystallization and grain growth. In this work, recrystallization and grain growth phenomena were modelled by using a two dimensional irregular CA method. Initial grain size, nuclei density and orientation of each grain were variables which have been used as entering data to the CA model. Final grain size, orientation of each grain, dislocation density and stress-strain curve were the results which have been resulted to validate the current model. Considering the model …

The Simulation Of Magnetorheological Elastomers Adaptive Tuned Dynamic Vibration Absorber For Automobile Engine Vibration Control, X.C Zhang, X.Z. Zhang, W.H. Li, B. Liu, X.L. Gong, P.Q Zhang

Faculty of Engineering - Papers (Archive)

The aim of this article is to investigate the use of a Dynamic Vibration Absorber to control vibration of engine by using simulation. Traditional means of vibration control have involved the use of passive and more recently, active methods. This study is different in that it involves an adaptive component in the design of vibration absorber using magnetorheological elastomers (MREs) as the adaptive spring.

MREs are kind of novel smart material whose shear modulus can be controlled by applied magnetic field. In this paper, the vibration mode of a simple model of automobile engine is simulated by Finite Element Method …

Numerical Modelling Of Dynamic Soil Liquefaction In Sloping Ground, Deepa S. Liyanapathirana

Faculty of Engineering - Papers (Archive)

In sloping ground, before application of dynamic loading, the ground is subjected to a static shear stress due to the weight of the soil and the slope of the ground. Static shear stresses will act as driving forces and cause very large ground deformations even before the onset of soil liquefaction. Therefore reliable prediction of soil response is essential in the assessment of remediation methods to reduce liquefaction induced soil deformation. This paper investigates the application of a stress path model to simulate the soil liquefaction in sloping ground. Pore pressure generation and liquefaction strength of the soil predicted by …

Comparison Of Pseudo-Static And Pseudo-Dynamic Methods For Seismic Earth Pressures On Retaining Wall, D Choudhury, Sanjay S. Nimbalkar, J N Mandal

Faculty of Engineering - Papers (Archive)

Design of retaining wall needs the complete knowledge of earth pressures for both active and passive conditions. Under earthquake condition, the design requires special attention to reduce the devastating effect of this natural hazard. But under seismic condition, the available literatures mostly give the pseudo-static analytical value of the earth pressures as an approximate solution to the real dynamic nature of the complex problem. In the present work, a recently developed pseudodynamic method, which incorporates time dependent effect of applied earthquake load and effect of shear and primary waves, is applied to study effect of variation of parameters like soil …

Contact State Determination For Robotic-Based Cylindrical Pair Height Adjustment Under Dynamic Conditions, Prasan I. De Waas Tilakaratna, Bijan Shirinzadeh, Gursel Alici

Faculty of Engineering - Papers (Archive)

This paper investigates fine motion strategies associated with the height adjustment manipulations of a cylindrical pair which can be utilised in dynamic assembly and reconfigurable workholding systems. The outer link of the cylindrical pair is held by the end-effector of a 6DOF serial articulated robot. The environment which holds the inner link can be dynamic. Formulations capable of identifying the type of contact between the links and parameters vital for control purposes based on the force and torque data provided by a wrist mounted F/T sensor are established for a generic spatial case. Experimental results indicate that the established methodology …

Dynamic Model Simplification Of Serial Manipulators, Subir Kumar Saha, Bijan Shirinzadeh, Gursel Alici

Faculty of Engineering - Papers (Archive)

Simplicity in the dynamics model of a serial robot manipulator greatly enhances the speed of its control and the associated hardware implementation. Since the motion of one link influences the torque or force required at the other joints, the control becomes difficult. This is referred as dynamic coupling. In this paper, it is proposed to simplify the robot's dynamic coupling by suitably choosing the manipulator’s kinematic and dynamic parameters. The intention is to make the Generalized Inertia Matrix (GIM) of the serial manipulator associated with its dynamic equations of motion diagonal and/or constant. Such choice automatically ensures the associated convective …

Effect Of A Robot's Geometrical Parameters On Its Optimal Dynamic Performance, M. Yousef Ibrahim, Christopher D. Cook, A K. Tieu

Faculty of Engineering - Papers (Archive)

This paper presents a study that was conducted at Monash University College - Gippsland on the effect of a robot’s geometrical parameters on its dynamic performance. This research was undertaken in pursuit of an optimal dynamic performance of industrial robots. In this study an indicator was established to quantitatively measure the dynamic performance of a robot arm with respect to changes in the geometrical parameters. Since the dynamic behaviour of a robot’s arm is largely dependent on its inertia terms; the performance indicator was based on the Logarithmic function of the sensitivity of the inertia matrix’s eigenvalues to changes in …