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Full-Text Articles in Engineering
Novel Control Techniques For Co2 Shielded Gas Metal Arc Welding, Dominic Cuiuri, John Norrish, Christopher Cook
Novel Control Techniques For Co2 Shielded Gas Metal Arc Welding, Dominic Cuiuri, John Norrish, Christopher Cook
Dominic Cuiuri
The control strategies that have been developed over the past four decades to control the inherently unstable metal transfer in the CO2-shielded GMAW process are described. The fundamental reasons for poor arc stability with CO2 as a shielding gas are discussed. From an understanding of the process behaviour, a new process control technique is proposed, and the future direction of research in this area is discussed.
An Alternative Current Control Approach For Dip Transfer Gmaw, Gary Dean, Dominic Cuiuri, John Norrish, Christopher Cook
An Alternative Current Control Approach For Dip Transfer Gmaw, Gary Dean, Dominic Cuiuri, John Norrish, Christopher Cook
Dominic Cuiuri
No abstract provided.
A Flexible Control Program For Research And Development In Tandem Gma Welding, Ruham Reis, John Norrish, Dominic Cuiuri, Alexander Nicholson
A Flexible Control Program For Research And Development In Tandem Gma Welding, Ruham Reis, John Norrish, Dominic Cuiuri, Alexander Nicholson
Dominic Cuiuri
No abstract provided.
Reflections From The Wearable Computing Conference In Toronto, Canada, Nick Rheinberger, Katina Michael, Alexander Hayes
Reflections From The Wearable Computing Conference In Toronto, Canada, Nick Rheinberger, Katina Michael, Alexander Hayes
Alexander Hayes Mr.
Could sports men and women who are monitored using wearable computers actually be playing to a global theatre to ensure the upkeep of their performance benchmarks instead of consciously watching and reacting to what is happening in the game they are playing? What are the social implications of heart rate monitors and GPS units now embedded into player clothing? What were some of the reflections from the IEEE ISTAS13 meeting on Wearable Computers in Every Day Life? What were some of the main messages that you walked away with from that conference? What made the greatest impression on us was …
No Limits To Watching?, Katina Michael, M.G. Michael
No Limits To Watching?, Katina Michael, M.G. Michael
Professor Katina Michael
Little by little, the introduction of new body-worn technologies is transforming the way people interact with their environment and one another, and perhaps even with themselves. Social and environmental psychology studies of human-technology interaction pose as many questions as answers. We are learning as we go: 'learning by doing' through interaction and 'learning by being'. Steve Mann calls this practice existential learning; wearers become photoborgs, a type of cyborg (cybernetic organism) whose primary intent is image capture from the domains of the natural and artificial. This approach elides the distinction between the technology and the human; they coalesce into one.
Session Based Differentiated Quality Of Service Admission Control For Web Servers, Yaya Wei, Chuang Lin, Fengyuan Ren, Eryk Dutkeiwicz, Raad Raad
Session Based Differentiated Quality Of Service Admission Control For Web Servers, Yaya Wei, Chuang Lin, Fengyuan Ren, Eryk Dutkeiwicz, Raad Raad
Dr Raad Raad
Recent advance-session based admission control (SBAC) has resulted in protecting the server from entering a regime in which latencies are excessive or session throughput collapses due to dropped requests and aborted sessions. The goal of this work is to introduce differentiated QoS to SBAC. We propose a two-threshold SBAC scheme (QSBAC). It can provide high throughput for preferred clients especially in overload situation. Furthermore, to adapt to varying traffic loads, a dynamic QSBAC (DQSBAC) scheme is also proposed. The experimental results show that comparing with SBAC scheme, both QSBAC scheme and DQSBAC scheme can sustain higher session throughput for preferred …
Autonomous Blimp Control Using Reinforcement Learning, Yiwei Liu, Zengxi Pan, David Stirling, Fazel Naghdy
Autonomous Blimp Control Using Reinforcement Learning, Yiwei Liu, Zengxi Pan, David Stirling, Fazel Naghdy
zengxi pan
This paper presents a new approach for navigation control of an autonomous blimp using an intelligent reinforcement learning algorithm. Compared to the traditional model based control methods, this control strategy does not require a dynamic model of the blimp, which provides huge advantage in many practical situations where the blimp system model is either hard to acquire or too complicated to apply. As the blimp will acquire a range of the pilot skills through a learning and rewarding mechanism during actual navigation trials, it can automatically account for the environmental changes during the navigation. The simulation data generated from a …
Modelling Trilayer Conjugated Polymer Actuators For Their Sensorless Position Control, Chuc Nguyen, Gursel Alici, G Wallace
Modelling Trilayer Conjugated Polymer Actuators For Their Sensorless Position Control, Chuc Nguyen, Gursel Alici, G Wallace
Chuc Huu Nguyen
In this paper, we present a new model to describe the displacement response of a trilayer conjugated polymer actuator that can operate in dry environments. The proposed model based on the working principle of conjugated polymer actuators includes diffusion impedances combined with double layer capacitors and charge transfer resistors. The parameters of the model are estimated by using a nonlinear least square estimation method by comparing simulation and experimental results. The proposed model is very useful in predicting the impedance as well as the displacement response of the polymer actuators accurately. Based on the proposed model, an inversion-based controller not …
Adaptive Sliding Mode Control Of Tri-Layer Conjugated Polymer Actuators, Xiangjiang Wang, Gursel Alici, Chuc Nguyen
Adaptive Sliding Mode Control Of Tri-Layer Conjugated Polymer Actuators, Xiangjiang Wang, Gursel Alici, Chuc Nguyen
Chuc Huu Nguyen
This paper proposes an adaptive sliding mode control methodology to enhance the positioning ability of conducting polymer actuators typified by tri-layer conjugated polymer actuators. This is motivated by the search for an effective control strategy to command such actuators to a desired configuration in the presence of parametric uncertainties and unmodeled disturbances. After analyzing the stability of the adaptive sliding mode control system, experiments were conducted to demonstrate its satisfactory tracking ability, based on a series of experimental results. Implementation of the control law requires a valid model of the conducting polymer actuator and boundaries of the uncertainties and disturbances. …
Semi-Active Variable Stiffness Vibration Control Of Vehicle Seat Suspension Using An Mr Elastomer Isolator, Haiping Du, Weihua Li, Nong Zhang
Semi-Active Variable Stiffness Vibration Control Of Vehicle Seat Suspension Using An Mr Elastomer Isolator, Haiping Du, Weihua Li, Nong Zhang
Dr Haiping Du
This paper presents a study on continuously variable stiffness control of vehicle seat suspension using a magnetorheological elastomer (MRE) isolator. A concept design for an MRE isolator is proposed in the paper and its behavior is experimentally evaluated. An integrated seat suspension model, which includes a quarter-car suspension and a seat suspension with a driver body model, is used to design a sub-optimal controller for an active isolator. The desired control force generated by this active isolator is then emulated by the MRE isolator through its continuously variable stiffness property when the actuating condition is met. The vibration control effect …
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.
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.
Towards The Position Control Of Conducting Polymer Trilayer Bending Actuators With Integrated Feedback Sensor, Stephen John, Gursel Alici, Christopher Cook
Towards The Position Control Of Conducting Polymer Trilayer Bending Actuators With Integrated Feedback Sensor, Stephen John, Gursel Alici, Christopher Cook
Christopher Cook
Conducting polymers have a wide range of reversibly controllable properties, leading to a number of potentially useful devices for robotic applications, including actuators, sensors and batteries. Conducting polymers have the advantages of low weight, low cost, flexibility, small activation potentials (
Novel Control Techniques For Co2 Shielded Gas Metal Arc Welding, Dominic Cuiuri, John Norrish, Christopher Cook
Novel Control Techniques For Co2 Shielded Gas Metal Arc Welding, Dominic Cuiuri, John Norrish, Christopher Cook
Christopher Cook
The control strategies that have been developed over the past four decades to control the inherently unstable metal transfer in the CO2-shielded GMAW process are described. The fundamental reasons for poor arc stability with CO2 as a shielding gas are discussed. From an understanding of the process behaviour, a new process control technique is proposed, and the future direction of research in this area is discussed.
Transition Velocity Function For Impulse Control Systems, Stephen Van Duin, Matthias Ahlswede, Christopher Cook
Transition Velocity Function For Impulse Control Systems, Stephen Van Duin, Matthias Ahlswede, Christopher Cook
Christopher Cook
This paper presents a modified impulse controller that is used to improve the velocity tracking of a servomechanism having characteristics of high nonlinear friction. A hybrid control scheme consisting of a conventional PID part and an impulsive part is used as a basis to the modified controller. This has previously been used to improve the position and velocity tracking of robot manipulators at very low velocities. Experiments show that at higher velocities the improved performance of the impulse part of the hybrid controller diminishes and can be counterproductive at these speeds when compared to conventional PID control alone. The modified …
Development Of A Supervisory Computer Control System For An Educational Fms, N Laszlo, Christopher Cook, Guenter Arndt, Yueping Yao
Development Of A Supervisory Computer Control System For An Educational Fms, N Laszlo, Christopher Cook, Guenter Arndt, Yueping Yao
Christopher Cook
A control system model for a fully integrated flexible manufacturing system (FMS) is presented. This model is being implemented on the ACME FMS, an educational system developed at the University of Wollongong. The implementation has progressed to the stage where it is coordinating activities within the system's cell.
Simulation And Implementation Of Agc Control On Hille 100 Experimental Rolling Mill, Xiaofeng He, Zhengyi Jiang, Christopher Cook
Simulation And Implementation Of Agc Control On Hille 100 Experimental Rolling Mill, Xiaofeng He, Zhengyi Jiang, Christopher Cook
Christopher Cook
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Robot Dynamic Control, J Tehve, Christopher Cook
Robot Dynamic Control, J Tehve, Christopher Cook
Christopher Cook
No abstract provided.
Adaptive Computer-Torque Control Of Robotic Manipulators, M Liu, Christopher Cook
Adaptive Computer-Torque Control Of Robotic Manipulators, M Liu, Christopher Cook
Christopher Cook
No abstract provided.
Adaptive Tracking Control Of Robots Based On Decentralised Error System Structures, Christopher Cook, Ming Liu, B Evans
Adaptive Tracking Control Of Robots Based On Decentralised Error System Structures, Christopher Cook, Ming Liu, B Evans
Christopher Cook
No abstract provided.
Dynamic Control Of A Robot Manipulator Using A Hardware Matrix Multiplier, J Tehve, Christopher Cook
Dynamic Control Of A Robot Manipulator Using A Hardware Matrix Multiplier, J Tehve, Christopher Cook
Christopher Cook
No abstract provided.
An Alternative Current Control Approach For Dip Transfer Gmaw, Gary Dean, Dominic Cuiuri, John Norrish, Christopher Cook
An Alternative Current Control Approach For Dip Transfer Gmaw, Gary Dean, Dominic Cuiuri, John Norrish, Christopher Cook
Christopher Cook
No abstract provided.
Adaptive Tracking Control Of Robotic Manipulators, M Liu, Christopher Cook
Adaptive Tracking Control Of Robotic Manipulators, M Liu, Christopher Cook
Christopher Cook
No abstract provided.
Adaptive Decentralized Dynamic Control For Robot Manipulators, M Liu, Christopher Cook
Adaptive Decentralized Dynamic Control For Robot Manipulators, M Liu, Christopher Cook
Christopher Cook
No abstract provided.
Autonomous Blimp Control Using Reinforcement Learning, Yiwei Liu, Zengxi Pan, David Stirling, Fazel Naghdy
Autonomous Blimp Control Using Reinforcement Learning, Yiwei Liu, Zengxi Pan, David Stirling, Fazel Naghdy
Professor Fazel Naghdy
This paper presents a new approach for navigation control of an autonomous blimp using an intelligent reinforcement learning algorithm. Compared to the traditional model based control methods, this control strategy does not require a dynamic model of the blimp, which provides huge advantage in many practical situations where the blimp system model is either hard to acquire or too complicated to apply. As the blimp will acquire a range of the pilot skills through a learning and rewarding mechanism during actual navigation trials, it can automatically account for the environmental changes during the navigation. The simulation data generated from a …
Control Of Autonomous Airship, Yiwei Liu, Zengxi Pan, David Stirling, Fazel Naghdy
Control Of Autonomous Airship, Yiwei Liu, Zengxi Pan, David Stirling, Fazel Naghdy
Professor Fazel Naghdy
Scientific research and development on the control of autonomous airship have shown a significant growth in recent years. New applications appear in the areas such as freight carrier, advertising, monitoring, surveillance, transportation, military and scientific research. The control of Autonomous airship is a very important problem for the aerial robots research. In this paper, the previous research on the control of autonomous blimp is reviewed, Several popular control methods are categorized and discussed in detail. Then an intelligent navigation control method, reinforcement learning control, is introduced in the autonomous blimp which was used for 2007 UAV Outback Challenge. The future …