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Articles 1 - 30 of 98
Full-Text Articles in Engineering
Reducing Wave-Based Teleoperator Reflections For Unknown Environments, Laurence Bate, Christopher Cook, Zheng Li
Reducing Wave-Based Teleoperator Reflections For Unknown Environments, Laurence Bate, Christopher Cook, Zheng Li
Christopher Cook
Wave variables guarantee stability for delayed teleoperation. They also introduce reflections which can prove very disorientating for an operator. This paper presents a new method for reducing the wave reflections when operating in unknown environments. The new method does not only guarantee stability but also laboratory experiments show it also reduces wave reflections allowing for improved velocity tracking and force feedback in complex and unknown operating environments.
Calorimetric Ac Loss Measurement Of Mgb2 Superconducting Tape In An Alternating Transport Current And Direct Magnetic Field, K See, X Xu, J Horvat, C Cook, S. Dou
Calorimetric Ac Loss Measurement Of Mgb2 Superconducting Tape In An Alternating Transport Current And Direct Magnetic Field, K See, X Xu, J Horvat, C Cook, S. Dou
Christopher Cook
Applications of MgB2 superconductors in electrical engineering have been widely reported, and various studies have been made to define their alternating current (AC) losses. However, studies on the transport losses with an applied transverse DC magnetic field have not been conducted, even though this is one of the favored conditions in applications of practical MgB2 tapes. Methods and techniques used to characterize and measure these losses have so far been grouped into ‘electrical’ and ‘calorimetric’ approaches with external conditions set to resemble the application conditions. In this paper, we present a new approach to mounting the sample and employ the …
Multi-Disciplinary Engineering Research And Development Skills For Mining - A Case Study, C Cook, S Van Duin, Ian Porter
Multi-Disciplinary Engineering Research And Development Skills For Mining - A Case Study, C Cook, S Van Duin, Ian Porter
Christopher Cook
This paper discusses how advanced manufacturing technology (AMT), which is fundamentally reliant on and developed via multi-disciplinary skills, has benefitted non-mining industries, and what lessons can be derived from this experience to benefit the mining industry, particularly underground coal mining. Examples of AMT use in 'conventional' industry, some drawn from the more than 25 years experience in many different industries of the Automation and Robotics team at the University of Wollongong, are described to show typical benefits, risks and opportunities expected in using AMT. Applying AMT to mining brings many unique challenges and this paper expands on these and then …
Decision Support: Informing Flood Management, R Laine, C Cook, B Lemass
Decision Support: Informing Flood Management, R Laine, C Cook, B Lemass
Christopher Cook
This paper describes the development of a new flood management decision support system which significantly improves the ability of flood practitioners to: 1) Identify adaptation and mitigation solutions to flood inundation; 2) Facilitate objective community flood risk management consultation and 3) Justify floodplain management decisions in a transparent and structured manner to all stakeholders. The nature of a Decision Support System (DSS) and its place in floodplain management is described and it is shown how a DSS can be used as a practical tool to identify options available to flood management practitioners. The new flood management system presented in this …
Innovative Calorimetric Ac Loss Measurement Of Htsc For Power Applications, K See, C Cook, S Dou
Innovative Calorimetric Ac Loss Measurement Of Htsc For Power Applications, K See, C Cook, S Dou
Christopher Cook
The applications of high-temperature superconductors (HTS) in electric power components have been widely reported and various studies have been made to define their alternating current (AC) losses-a key design parameter for many practical high power electrical engineering applications. However, very few studies over the range 25 to 45 K have been conducted even though this is one of the favored temperature ranges for cost-effective applications of HTS. Methods and techniques used to characterize and measure these losses have been so far grouped into `electrical' and `calorimetric' approaches with external conditions set to resemble the application conditions. In this paper, we …
Transport Critical Current Of Mgb2 Wires: Pulsed Current Of Varying Rate Compared To Direct Current Method, K See, X Xu, J Horvat, C Cook, S. Dou
Transport Critical Current Of Mgb2 Wires: Pulsed Current Of Varying Rate Compared To Direct Current Method, K See, X Xu, J Horvat, C Cook, S. Dou
Christopher Cook
The measurement of transport critical current (Ic) forMgB2 wires and tapes has been investigated with two different techniques, the conventional four-probe arrangement with direct current (DC) power source, and a tailored triangle pulse at different rates of current change. The DC method has been widely used and practiced by various groups, but suffers from inevitable heating effects when high currents are used at low magnetic fields. The pulsed current method has no heating effects, but the critical current can depend on the rate of the current change (dI/dt) in the pulse. Our pulsed current measurements with varying dI/dt show that …
Evaluation Of Control Techniques For Dip Transfer Gas Metal Arc Welding, Gary Dean, John Norrish, Christopher D. Cook
Evaluation Of Control Techniques For Dip Transfer Gas Metal Arc Welding, Gary Dean, John Norrish, Christopher D. Cook
Christopher Cook
Dip transfer gas metal arc welding (GMAW) is used extensively for high productivity welding of thin sheet steel, and is also useful for positional welding of thicker section steels. Unfortunately in the past, the process has gained a reputation for fusion defects, which becomes more apparent when welding traditionally difficult materials such as coated steels. This reputation can be attributed in some instances to the method of control used and the changeable nature of variables crucial to controlling heat transfer during the welding process. The paper examines the relationship between weld fusion, heat input and current for coated steel welding …
Drilling Of Carboncomposites Using Aoneshotdrillbit. Part I: Five Stage Representation Of Drilling And Factors Affecting Maximum Force And Torque, Marta Fernandes, C. Cook
Drilling Of Carboncomposites Using Aoneshotdrillbit. Part I: Five Stage Representation Of Drilling And Factors Affecting Maximum Force And Torque, Marta Fernandes, C. Cook
Christopher Cook
The thrust force and torque produced during drilling contain important information related to the quality of the hole and the wear of the drillbit[1]. In this paper, the force and torque produced during drilling of carbon fibre using a ‘oneshot’ drillbit is investigated. The signals in the time domain were divided into stages and common problems and defects associated with each stage discussed. It is also shown how tool wear and thickness of the workpiece affect the thrust force and torque throughout the drilling process. The findings of this paper are used to develop a mathematical model of the maximum …
Bending Modeling And Its Experimental Verification For Conducting Polymer Actuators Dedicated To Manipulation Applications, Christopher Cook, Gursel Alici, Brian Mui
Bending Modeling And Its Experimental Verification For Conducting Polymer Actuators Dedicated To Manipulation Applications, Christopher Cook, Gursel Alici, Brian Mui
Christopher Cook
No abstract provided.
Note On Robot Control System Performance Evaluation, B Evans, Christopher Cook, Geoffrey Trott
Note On Robot Control System Performance Evaluation, B Evans, Christopher Cook, Geoffrey Trott
Christopher Cook
No abstract provided.
Depth Maps Generation Through Thresholding In A Robotics System, H Shi, Christopher Cook
Depth Maps Generation Through Thresholding In A Robotics System, H Shi, Christopher Cook
Christopher Cook
The project described in this paper aims to develop a simple but efficient method for mapping the depth of an object used in an industrial application. In order to produce the depth and cross-sectional images of an object the intensity threshold for converting the grey image to a binary image is varied. This operation will not produce a satisfactory result when the object is observed in air. The result will be however significantly different when the object is located in a colour liquid. Since the refraction of the light in the liquid varies with the depth, the intensity of the …
Extracting 3-Dimensional Information From Single Camera Vision System, H Shi, Christopher Cook, Fazel Naghdy
Extracting 3-Dimensional Information From Single Camera Vision System, H Shi, Christopher Cook, Fazel Naghdy
Christopher Cook
In this paper, a new approach for extracting three-dimensional information from single camera vision system is presented. Only one plan view of the object will be obtained from a camera when the object is placed in the air, even if the threshold of the camera is varied. The result will be however significantly different when the object is located in a colour liquid. It is due to high absorption of the light in a colour liquid. The amount of absorption varies with the depth of the liquid. This allows different plan views related to the depth of an object to …
Performance Benchmarks For Industrial Robots, Christopher Cook
Performance Benchmarks For Industrial Robots, Christopher Cook
Christopher Cook
No abstract provided.
New General Algorithm For Describing Manipulator Kinematics, Christopher Cook, T Vu-Dinh
New General Algorithm For Describing Manipulator Kinematics, Christopher Cook, T Vu-Dinh
Christopher Cook
A new algorithm for representing the kinematic problem of robot arms is presented, and its advantages discused. It is shown that manipulator links and joints can be described using generalised cascaded 'robot joint descriptors'. Such a description provides a theoretical basis for the development of a kinematic controller applicable to most manipulator geometries.
Characterisation And Control Of A Prototype Hts Smes Device, Christopher J. Hawley, Dominic Cuiuri, Christopher D. Cook, Steve Gower, Timothy Beales
Characterisation And Control Of A Prototype Hts Smes Device, Christopher J. Hawley, Dominic Cuiuri, Christopher D. Cook, Steve Gower, Timothy Beales
Christopher Cook
A 2.79 kJ prototype high transition temperature Superconducting Magnetic Energy Storage (SMES) device has been constructed. The coil for the prototype has been wound using High Temperature Superconducting (HTS) BSCCO-2223 tape. The refrigeration system is a gaseous helium cold head cryocooler used to maintain the SMES coil at a temperature of 30 K, improving the Ic characteristic of the coil by a factor of 4.7 compared to that at 77 K. The SMES device is capable of supplying a 3-phase load during power interruptions, and has been constructed during a program to develop a larger 20 kJ system aimed at …
Robots And Automation In The Workplace, Christopher Cook
Robots And Automation In The Workplace, Christopher Cook
Christopher Cook
No abstract provided.
Measurements Of Ac Losses In Htsc Wires Exposed To An Alternating Field Using Calorimetric Methods, Tri Hardono, Christopher Cook, Jian Xun Jin
Measurements Of Ac Losses In Htsc Wires Exposed To An Alternating Field Using Calorimetric Methods, Tri Hardono, Christopher Cook, Jian Xun Jin
Christopher Cook
Calorimetric methods for AC loss measurement for short superconducting wires have been investigated. The design, operation and results obtained from an experimental calorimeter are described. With these methods the total loss of a short superconducting sample exposed to a 50 Hz alternating field, both perpendicular and axial, have been measured with an accuracy of microwatts per centimeter. The sample is a 6 centimeter long (Bi,Pb)SrCaCuO-2223 silver-sheathed multifilamentary wire prepared by powder-in-tube techniques. The hysteresis part of the loss may be obtained by taking the eddy current component of the silver sheath from the total loss and by neglecting the coupling …
Initiating Curriculum Review: The Chilean Experience, Thomas L. Goldfinch, Anna L. Carew, Christopher David Cook, Patricio Olivares, Paul Cooper, Timothy J. Mccarthy, Sharon Nightingale
Initiating Curriculum Review: The Chilean Experience, Thomas L. Goldfinch, Anna L. Carew, Christopher David Cook, Patricio Olivares, Paul Cooper, Timothy J. Mccarthy, Sharon Nightingale
Christopher Cook
This paper describes the initiation of a comprehensive engineering curriculum review at the Universidad Tecnológica Metropolitana, in Santiago, Chile. This work is being led by a team from the University of Wollongong through a World Bank contract to assist UTEM in modernising its curriculum and in enhancing the 'employability and general formation of its graduates. The paper outlines the background to the project, the structured curriculum review process proposed, and the planning and outcomes of an interactive workshop used to initiate the review. It also makes note of the difficulties faced when initiating a major curriculum review through the cultural, …
The Concept And Design Of Programmable Array Manipulator, Philip Ciufo, Fazel Naghdy, Christopher D. Cook, Pak Chung Wong
The Concept And Design Of Programmable Array Manipulator, Philip Ciufo, Fazel Naghdy, Christopher D. Cook, Pak Chung Wong
Christopher Cook
This paper is the complement to the Programmable Array Manipulator, Part 1. It presents an overview of the R & D program associated with the development of the PAM. The aspects of the control scheme are given as are some experimental results showing the preliminary capabilities of the PAM.
Fusion Control In Dip Transfer Gas Metal Arc Welding, Gary Dean, John Norrish, Christopher Cook
Fusion Control In Dip Transfer Gas Metal Arc Welding, Gary Dean, John Norrish, Christopher Cook
Christopher Cook
No abstract provided.
Self-Tuning Controller For A Non-Linear System, M. A Magdy, R Russell, Christopher Cook
Self-Tuning Controller For A Non-Linear System, M. A Magdy, R Russell, Christopher Cook
Christopher Cook
No abstract provided.
Empirical Modelling Of Force Profiles Produced During Drilling Of Carbon Composites, Christopher Cook, Gursel Alici, Marta Fernandes
Empirical Modelling Of Force Profiles Produced During Drilling Of Carbon Composites, Christopher Cook, Gursel Alici, Marta Fernandes
Christopher Cook
No abstract provided.
Robotics Assembly Of Electronic Components On To Pcbs, Christopher Cook
Robotics Assembly Of Electronic Components On To Pcbs, Christopher Cook
Christopher Cook
No abstract provided.
Frequency Response Of Polypyrrole Trilayer Actuator Displacement, Stephen John, Gursel Alici, Christopher David Cook
Frequency Response Of Polypyrrole Trilayer Actuator Displacement, Stephen John, Gursel Alici, Christopher David Cook
Christopher Cook
Conducting polymer trilayers are attractive for use in functional devices, given low actuation voltages, operation in air and potentially useful stresses and strains; however, their dynamic behavior must be understood from an engineering perspective before they can be effectively incorporated into a design. As a step towards the identification of the actuator dynamics, frequency response analysis has been performed to identify the magnitude and phase shift of displacement in response to a sinusoidal voltage input. The low damping of the trilayer operating in air and the use of a laser displacement sensor has allowed the frequency response to be continuously …
Vision System Using Coloured Liquid, S Hao, Fazel Naghdy, Christopher Cook
Vision System Using Coloured Liquid, S Hao, Fazel Naghdy, Christopher Cook
Christopher Cook
No abstract provided.
Magnetic Saturable Reactor Type Hts Fault Current Limiter For Electrical Application, Jian Xun Jin, S Dou, Christopher Cook, C Grantham, M Apperley, Timothy Beales
Magnetic Saturable Reactor Type Hts Fault Current Limiter For Electrical Application, Jian Xun Jin, S Dou, Christopher Cook, C Grantham, M Apperley, Timothy Beales
Christopher Cook
An electricalfaultcurrentlimiter (FCL) developed based on the principle of a magneticsaturablereactor requires a high current ampere-turn coil as its dc bias, and this coil is necessary to use a high temperature superconducting (HTS) winding. This HTS FCL has been studied, and identified with several advantages compared to other HTS FCLs, and therefore is further considered for its practical industry application.
Modelling Of Polypyrrole Actuators, Mehrdad Bahrami Samani, Geoffrey Spinks, Philip Whitten, Christopher Cook
Modelling Of Polypyrrole Actuators, Mehrdad Bahrami Samani, Geoffrey Spinks, Philip Whitten, Christopher Cook
Christopher Cook
Conducting polymers (CP) are a promising area in the field of micro actuators, and have potential applications in micro robotics. Their properties are modelled as having an electro-chemical active component and a passive viscoelastic component. Methods exist to model the passive component as a configuration of springs and dashpots and the electro-active effects as a strain generator. Typically, the strain is assumed to be proportional to the charge transferred, and the two components are assumed to be independent. We show that there is a significant interaction between the two components for polypyrrole actuators, by observing the dynamic elastic modulus whilst …
Computer Control Of Machines With Friction For Precise Motion, Simon Webb, Zheng Li, Christopher David Cook
Computer Control Of Machines With Friction For Precise Motion, Simon Webb, Zheng Li, Christopher David Cook
Christopher Cook
We study the problem of precise control of machines with static and Coulomb friction. An experimental X-Y testbed built for testing various control methods is described and initial experimental results are presented. A simple pole placement controller is designed for computer control of the X-Y testbed based on a generalised sampled-data hold. Robustness and stability of the controller are analysed. Simulation suggests that this controller is able to achieve precise position control even when parameters of both the dynamics of the machine and the characteristics of friction are unknown
Quartz Crystal Microbalance Study Of Volume Changes And Modulus Shift In Electrochemically Switched Polypyrrole, Mehrdad Bahrami-Samani, Christopher Cook, John Madden, Geoffrey Spinks, Philip Whitten
Quartz Crystal Microbalance Study Of Volume Changes And Modulus Shift In Electrochemically Switched Polypyrrole, Mehrdad Bahrami-Samani, Christopher Cook, John Madden, Geoffrey Spinks, Philip Whitten
Christopher Cook
The performance of conducting polymers as actuators is determined by a complicated series of molecular processes that occur as a result of oxidation and reduction of the polymer. In particular, the amount of actuation strain generated for a given voltage stimulus is determined by the number and type of ions (and solvent) that enter and leave the polymer and changes in the mechanical properties (particularly elastic modulus) of the polymer. In this paper, we present the effects of cyclic voltammetry on the shear modulus and volume of polypyrrole in two different electrolytes: propylene carbonate and an ionic liquid. An electrochemical …
Computer Simulation Study On The Dynamic Behaviour Of An Aeac Mechanical Manipulator, M Ibrahim, Christopher Cook, A Tieu
Computer Simulation Study On The Dynamic Behaviour Of An Aeac Mechanical Manipulator, M Ibrahim, Christopher Cook, A Tieu
Christopher Cook
No abstract provided.