The geometric bounding toolbox is a set of routines in MATLABTM to perform operations on polytopes, polyhedra and ellipsoids. The package has the efficiency and ease of use of its routines that seems to make these com...
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The geometric bounding toolbox is a set of routines in MATLABTM to perform operations on polytopes, polyhedra and ellipsoids. The package has the efficiency and ease of use of its routines that seems to make these complex operations simple. The paper is an overview of the use of MATLAB toolbox GBT for system identification and control.
With the growing interest in the use of system identification as a means to build models for controldesign, the paper presents methods for robust model based controldesign in order to reach the goal of high performa...
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With the growing interest in the use of system identification as a means to build models for controldesign, the paper presents methods for robust model based controldesign in order to reach the goal of high performance plant control. The traditional identification method delivers a model in the form of a linear time invariant finite dimensional system also called nominal model and not all controllers suited for the nominal model will perform well with the plant. The main principle tackled in this report is that robustness must be traded off versus nominal performance.
The idea of worst case identification is to obtain approximations to an unknown system from a set of noisy data either transfer function measurements or input/output measurements. The paper discusses choices of inputs...
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The idea of worst case identification is to obtain approximations to an unknown system from a set of noisy data either transfer function measurements or input/output measurements. The paper discusses choices of inputs for a robust, convergent algorithm, the disadvantage of least squares fits in that worst case errors will be as bad as a convergence rate achieved with stable inputs.
System identification complements not only the robustness requirement of maintaining control in the face of plant uncertainty but thrives on the symbiotic relationship with it. This relationship exists as an iterative...
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System identification complements not only the robustness requirement of maintaining control in the face of plant uncertainty but thrives on the symbiotic relationship with it. This relationship exists as an iterative process of identification and controldesign while the identification requirement derives it specification from the closed loop performance with the previous controller and delivers an error bound that dictates the design of the successive controller. This paper applies and extends techniques in the emerging field of HINF identification to the problem of identifying a real plant as well as estimating the called a priori information necessary to determine worst case error bounds.
A successful software development depends on the soundness of defined processes, development methodologies and validation activities but to guarantee customer satisfaction, organizations must seek an active customer i...
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A successful software development depends on the soundness of defined processes, development methodologies and validation activities but to guarantee customer satisfaction, organizations must seek an active customer involvement in the development process. This can be agreed on an individual project basis but, to ensure that it is actually undertaken, mechanisms should be built into the supplier's quality management systems (QMS). It need not require a customer to work but rather give specific, visible role at certain points in a product development.
Quality Function Deployment (QFD) can improve the quality and cost-effectiveness of products and systems by following some suggested practical ways. A two-phase approach places the emphasis on how to limit the work in...
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Quality Function Deployment (QFD) can improve the quality and cost-effectiveness of products and systems by following some suggested practical ways. A two-phase approach places the emphasis on how to limit the work involved while identifying problem areas that may need further investigation. Using this technique, designers can avoid producing products not meeting the customers' needs or not matching up to the competition.
Motion controllers are an essential component of modern manufacturing machinery. The computer controlsystems are a key part in designing and building production machines. Due to a lack of solid mechanical parts to au...
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Motion controllers are an essential component of modern manufacturing machinery. The computer controlsystems are a key part in designing and building production machines. Due to a lack of solid mechanical parts to automatically link motions, coordination and synchronisation problems among the interactive motions are the one of major barriers which can hamper further advances with the new design philosophy. The tight control and flexible operation of a machine with multi-axes can only be realised if the software controlled drives can be properly coordinated and synchronised. This paper presents the concept and implementation of a scheme that uses a fuzzy logic control approach to realise enhanced drive synchronisation. A new master-slave configuration using fuzzy logic is developed. Imperfect synchronisation can be corrected on-line. The simulation and experimental results show that the fuzzy based 'closed loop synchronisation mechanism' gives enhanced performance when compared to conventional master-slave open loop synchronisation techniques.
design Function Deployment (DFD) allows quality to be built into the development of a product or process, at the early stages of engineering design, by using a planned and controlled approach to design. DFD provides t...
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design Function Deployment (DFD) allows quality to be built into the development of a product or process, at the early stages of engineering design, by using a planned and controlled approach to design. DFD provides the necessary platform for a design for quality system by allowing (1) the consideration of many design solutions before find selection, (2) evaluation and optimization at various stages of the design process, (3) the use of several design methods to minimize variation, (4) the use of emerging technologies and materials, and (5) the adoption of a simultaneous design approach. DFD, thus ensures both direct and indirect integration of quality into the product design.
The internal customer-driven quality management concept has proven for Bowater Containers Ltd a practical and effective route to quality improvement. The internal customer initiative aimed at providing all (external a...
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The internal customer-driven quality management concept has proven for Bowater Containers Ltd a practical and effective route to quality improvement. The internal customer initiative aimed at providing all (external and internal) customers with continuously improving products and services that consistently satisfy their changing expectations. The initiative introduced checksheets, pareto analysis and cause and effect diagrams to aid information gathering and, eventually, solving the problem areas.
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