Browsing by Discipline
Now showing items 21-40 of 54
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Dynamics of single axle rail wheelsets incorporating profiled wheels and rails
(2009)This thesis presents the theories and numerical simulations in regard to the behaviour of a single-axle railway wheelset commonly used in cargo rail cars. Specifically, creep forces, dynamic models, real wheel-rail profiles, ... -
Efficient analysis of oscillators with multiple time dimensions
(2005)Harmonic Balance (H B ) analysis is an established technique for the analysis of nonlinear circuits. In this thesis, we present a method to find the transient and steady-state behavior of oscillators based on a harmonic ... -
End-to-end shared restoration in multi-domain networks / by Zhiying Gao.
(2008)Emerging multi-service data applications require high-bandwidth high-quality connectivity across multiple network domains, each of which is generally controlled by an independent service provider. These applications ... -
Experimental evaluation of some classical and adaptive iterative learning control schemes on a 5DOF robot manipulator
(2004)In many process industries (e.g., VLSI production lines, Automotive industries, IC welding process, inspections, manipulations), robot manipulators are used to perform the same tasks repeatedly over a finite time interval. ... -
Frequency domain tuning approach for adaptive feedforward controllers
(2003)Feedforward control provides a means for compensating measurable disturbances before the process output is affected. A novel tuning strategy for tuning feedforward controllers in frequency domain is developed in this ... -
Fuzzy logic based online adaptation of current and speed controllers for improved performance of IPMSM drive
(2013-02-12)Precise torque and speed control of electric motors is a key issue in industries for variable speed drives (VSD). Over the years the induction motors have been widely utilized in industries for VSD applications. However, ... -
Fuzzy logic control of a two degree of freedom parallel robot
(2010)Parallel robots differ greatly from their serial counterparts in terms of performance and mechanical ability. Serial robots are open chained mechanisms since each link is connected to an adjacent one and each joint is ... -
Governor control for Kakabeka Falls Generating Station
(1999)This thesis examines a specific problem of governor control on a set of hydroelectric turbines that suffer from severe wicket gate leakage. Linear modeling and the steady state behavior of each turbine is investigated ... -
Integrated mechanisms for QoS and restoration in mesh transport networks
(2007)Survivable networks have the capability to survive from the events of network components failures. The resilience mechanisms in these networks protect and restore the impaired communication paths by using spare capacity. ... -
Intelligent systems for active vibration control in flexible engineering structures / by Ji Xiaoxu.
(2008)Vibration arises in almost all moving structures. Vibration control is important to many applications such as robotic arms, aircraft wings, buildings in wind, vehicle transmission systems,to name but a few. The objective ... -
Iterative learning control for robot manipulators
(2004)When a system is performing the same task repeatedly it is, from an engineering perspective, advantageous to use the knowledge from the previous iterations of the same task in order to reduce the error on successive ... -
Modelling, simulation and control of nonlinear flexural-flexural-inextensional rotating beam
(2004)A continuous rotating beam that undergoes flexure about two principal axes is modelled. The beam is characterized by gyroscopic type nonlinearities. The beam is of significant importance for applications such as large ... -
Multi-time analysis of CMOS circuits
(2008)Transient simulation of circuits with widely separated time constants and fast periodic excitations is not efficient because a long simulation period with small time steps is required. One approach to simulate the transient ... -
Non-collocated control of vibration of a three-DOF structure using the electromagnetic vibration absorber
(2007)Vibration control is very important in many areas including machine operation and daily life. Semi-active vibration control integrates a tuning control scheme with a tunable vibration absorber for suppression of vibration ... -
Nonlinear controller design for a buck converter
(2006)This thesis presents five different nonlinear control techniques for voltage regulation of a DC-DC buck converter operating in continuous conduction mode. A state space averaging model is derived from a non-ideal buck ... -
Nonlinear dynamics of railway wheelsets incorporating randomness
(2007)The thesis is to investigate the dynamic behavior of a single-axle railway wheelset and identify its chaotic behavior by means of time history, phase portrait, Lyapunov exponents, information dimension, bifurcation diagram ... -
A nonlinear energy sink with energy harvester
(2014-12-11)The transfer of energy between systems is a natural process, manifesting in many different ways. In engineering transferable energy can be considered wanted or un- wanted. Specifically in mechanical systems, energy transfer ... -
Novel Hilbert Huang transform techniques for bearing fault detection
(2014-01-22)Bearings are commonly used in rotary machinery; while up to half of machinery malfunctions could be related to bearing defects. A reliable bearing fault detection technique becomes vital to a wide array of industries to ... -
Observer-based chaos synchronization for secure communications
(2006)Chaos, with reference to chaos theory, refers to an apparent lack of order in a system that, nevertheless, obeys particular laws or rules. The chaotic signals generated by chaotic systems have some properties such as ... -
On the control methedologies of a novel active vibration isolator
(2010)The work presented in this thesis is motivated by the need for new and effective methods to isolate vibrations in the rapidly growing technological sector, with particular interest in the control methodologies for active ...