6,083 research outputs found
Field Simulation as an Aid to Machine Design: The State of the Art
No full textThe paper provides an overview of the modern field simulation techniques available to assist in the design and performance prediction of electromechanical devices, including electric motors. Commercial software, usually based on finite element or related techniques, is already very advanced and provides a reliable tool for every-day use in the design office. At the same time Computational Electromagnetics is a thriving area of research with emerging new techniques and methods, in particular for multi-physics and optimisation problems
Modern Design of Electromechanical Devices
No full textThe paper provides an overview of the modern field simulation techniques available to assist in the design and performance prediction of electromechanical devices, including electric motors. Commercial software, usually based on finite element or related techniques, is already very advanced and provides a reliable tool for every-day use in the design office. At the same time Computational Electromagnetics is a thriving area of research with emerging new techniques and methods, in particular for multi-physics and optimisation problems
Modern design optimisation exploiting field simulation
No full textThe presentation will review some of the new developments in optimisation techniques and their relevance to the design of electrical machines and drive systems. Cost effective algorithms will be explored for computationally expensive modelling processes such as encountered when field simulation techniques are employed in CAD aided design. Surrogate modelling, kriging-assisted methods, pareto-optimality and design sensitivity will be emphasised
Computational electromagnetics for design optimisation: the state of the art and conjectures for the future
No full textThe paper reviews the state of the art in modern field simulation techniques available to assist in the design and performance prediction of electromechanical and electromagnetic devices. Commercial software packages, usually exploiting finite element and/or related techniques, provide advanced and reliable tools for every-day use in the design office. At the same time Computational Electromagnetics continues to be a thriving area of research with emerging new techniques and methods, in particular for multi-physics applications and in the area of multi-objective optimisation
High Temperature Superconducting Machines - the State of the Art
No full textThe paper is a brief summary of the talk which provides the state of the art in power applications of high temperature superconductivity. It is argued that the technology offers great potential for power devices such as generators, motors, transformers, fault current limiters and cables. Examples of demonstrators and working prototypes are given with emphasis on work undertaken at Southampton University. Main achievements and remaining challenges are highlighted
Depth Measurement of Face and Palate by Structured Light
No full textIn order to model speech production for purposes such as articulatory synthesis, articulatory data must be acquired, preferably in a way that does not impede the speaker's ability to speak. A variety of techniques has been used, many of them, such as ultrasound, X-rays, or MRI, adapted from medical imaging. For externally accessible articulators such techniques are not appropriate, but the task of measuring the shape of a complex three-dimensional object is still difficult. For a static object such as a dental impression manual methods such as slicing a mold of the impression and measuring the slices with calipers can be quite accurate, though time-consuming. For a dynamic object such as the face shape during speech such manual methods cannot be used. A workable alternative has been developed at Grenoble that instead uses simultaneous video pictures of front and profile face. Blue lipstick is used on the subject's lips to provide a definite outline and provide maximum contrast with the teeth and tongue. The images must then be post-processed before parameters such as mouth area are extracted. In this paper we present a structured light system which uses a slide projector and a single video camera to acquire depth coordinates of a static or moving object. We discuss pilot experiments aimed at optimising its output and establishing its accuracy, and make some preliminary comparisons with the Grenoble double-video system. In the next section the structured light technique is summarised, focusing on the experimental constraints it imposes. The technique is described in more detail elsewhere. In Static measurements' its use on the static object of an EPG palate is described. In 'Dynamic measurements' its use in acquiring dynamic face shape data is described, focusing on methodology issues that arose in an extended recording session with a human speaker. In the discussion we describe the calibration procedure and the related tradeoffs, and finally we make some initial comparisons to the double-video system
Field simulation studies for a high temperature superconducting synchronous generator with a coreless rotor
No full textModelling of impulse loading in high temperature superconductors: assessment of accuracy and performance of computational techniques
No full textMultidimensional application of a finite difference front fixing method to various front-type problems with moving boundaries and non-linear material properties is discussed. Advantages and implementation problems of the method are highlighted. Particular attention is focused on conservation properties of the algorithm and accurate solutions close to the moving boundaries. The algorithm is tested using analytical solutions of diffusion problems with cylindrical symmetry
J.K. Rowling: Her Life and Works
No full textBiographical information on author J.K. Rowling, a bibliography of her works, and a selection of her tweets
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