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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

An investigation of singular optimal control problems

Scardina, John Anthony 05 1900 (has links)
No description available.

A design procedure based on the quadratic performance index and linear least squares approximations

Peterson, David Eric 05 1900 (has links)
No description available.

A study of the characteristics of control systems designed using the quadratic index of performance

Bell, Charles James 08 1900 (has links)
No description available.

On a problem of parameter identification in a distributed system

Aziz, Sajid. January 1978 (has links)
No description available.

Controlling the feedrate of material from a vibratory pipe conveyor using an electro-magnetic vibrator and load cell system

Janse van Vuuren, Gary Peter January 1994 (has links)
Submitted in compliance with the requirements for the National Masters Diploma in Technology: Electronic Engineering, Technikon Natal, 1994. / This work presents a novel way of controlling the feed rate of raw material from a vibratory pipe feeder system. The system consists of a hopper, feeder pipe, electromechanical vibrator and a loadcell which measures the mass of the complete system. Raw material is gravity fed onto the vibrating pipe whose amplitude of vibration controls the amount of material fed. / M

Steady-state characteristics at subsynchronous speeds of an SCR-controlled synchronous motor

Kano, Takashi January 1971 (has links)
Okada's three-phase star-connected circuit with three delta-connected SCRs inserted in the neutral point is analyzed using Take-uchi's ϕ-function method. The three-phase synchronous motor with three delta-connected SCRs inserted in the neutral point of the armature windings is then investigated. By control of the firing of the SCRs, operation at subsynchronous speeds is possible. The analysis of the steady-state operation of the SCR-controlled synchronous motor is experimentally checked. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Decomposition and optimal control theory

Masak, Mart January 1968 (has links)
The objective of this thesis is to investigate decomposition and its applicability to the theory of optimal control. The work begins with a representation of the structure of the optimal control problem in terms of directed graphs. This representation exposes a strong connectedness property leading to fundamental difficulties which are central in limiting the class of control problems to which decomposition can successfully be applied. Computational problems of optimal control are then considered, and decomposition is found to provide a framework within which to analyse numerical methods suitable for parallel processing. A number of such methods are shown and a numerical example is used to illustrate the viability of one of these. In the second part of the thesis, the optimal control law synthesis problem is discussed together with an inverse problem. The latter concerns the requirement of a second-level co-ordinator in a hierarchical structure. A multi-level controller is then suggested for a class of systems. The effect of this controller structure is to provide a performance very close to the optimal while maintaining adequate sub-optimal control in case of a breakdown of the second-level co-ordinator. The structure is justified on the basis of the second variation theory of the calculus of variations. Finally, a new computational technique founded on the geometrical concepts of optimal control theory is introduced. This results in replacing the unstable co-state variables associated with Pontryagin's maximum principle with a set of bounded variables. The facility in the choice of initial iterates makes the method promising. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

A comparison of methods for multivariable control synthesis

White, Robert Lee, 1940- January 1964 (has links)
No description available.

Learning to control

Potts, Duncan, Computer Science & Engineering, Faculty of Engineering, UNSW January 2007 (has links)
This thesis examines whether it is possible for a machine to incrementally build a complex model of its environment, and then use this model for control purposes. Given a sequence of noisy observations, the machine forms a piecewise linear approximation to the nonlinear dynamic equations that are assumed to describe the real world. A number of existing online system identification techniques are examined, but it is found that they all either scale poorly with dimensionality, have a number of parameters that make them difficult to apply, or do not learn sufficiently accurate approximations. Therefore a novel framework is developed for learning linear model trees in both batch and online settings. The algorithms are evaluated empirically on a number of commonly used benchmark datasets, a simple test function, and three dynamic domains ranging from a simple pendulum to a complex flight simulator. The new batch algorithm is compared with three state-of-the-art algorithms and is seen to perform favourably overall. The new incremental model tree learner also compares well with a recent online function approximator from the literature. Armed with a tool for effectively constructing piecewise linear models of the environment, a control framework is developed that learns trajectories from a demonstrator and attempts to follow these trajectories within each linear region usinglinear quadratic control. The induced controllers are able to swing up and balance a simple forced pendulum both in simulation and in the real world. They can also swing up and balance a real double pendulum. The induced controllers are empirically shown to perform better than the original demonstrator, and could therefore be used to either replace a human operator or improve upon an existing automatic controller. In addition an ability to generalise the learnt trajectories enables the system to perform novel tasks. This is demonstrated on a flight simulator where, having observed an aircraft flying several times around a circuit, the controller is able to copy the take-off procedure, fly a completely new circuit that includes new manoeuvres, and successfully land the plane.

Sensitivity analysis of cam-and-follower mechanism at high speeds

Yang, Shyuan-Bai. January 1981 (has links)
Thesis (M.S.)--Ohio University, June, 1981. / Title from PDF t.p.

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