Thesis (Ph. D.)--University of Canterbury, 2008. / Typescript (photocopy). "24 September 2008." Includes bibliographical references (p. [137]-143). Also available via the World Wide Web.

Thesis (M.S.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 76-77). Also available on the World Wide Web.

Thesis (M.S.)--West Virginia University, 2010. / Title from document title page. Document formatted into pages; contains x, 154 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references.

Η παρούσα διπλωματική εργασία αναφέρεται στην μέτρηση και την καταγραφή της επιτάχυνσης ενός αντικειμένου. Μετράται η επιτάχυνση και στους τρεις άξονες και η μέτρηση γίνεται μέσω ενός ενσωματωμένου συστήματος, το οποίο είναι βασισμένο στην οικογένεια μίκρο-επεξεργαστών STM32 της εταιρίας ST Microelectronics. Συγκεκριμένα, το σύστημα είναι ο microcontroller STM32-103STK της εταιρίας Olimex, ο οποίος προγραμματίζεται κατάλληλα για τον σκοπό αυτό. Έτσι, αφού περιγραφούν οι ιδιότητες και τα χαρακτηριστικά του προαναφερθέντος συστήματος και των περιφερειακών συσκευών που το πλαισιώνουν, περιγράφονται κάποιες από τις διαθέσιμες σουίτες εφαρμογών που διατίθενται για την ανάπτυξη ενσωματωμένων εφαρμογών. Στην συνέχεια παρουσιάζεται η μεθοδολογία πάνω στην οποία στηρίχθηκε η ανάπτυξη της ενσωματωμένης εφαρμογής. Συγκεκριμένα, ο προγραμματισμός του συστήματος προϋποθέτει την ανά τακτά χρονικά διαστήματα μέτρηση των τιμών επιτάχυνσης στους τρεις άξονες. Οι τιμές αυτές της επιτάχυνσης, αφού εγγραφούν στην οθόνη για να γίνουν ορατές στον χρήστη, αποθηκεύονται σε μία κάρτα τύπου SD (Secure Digital). / This diploma thesis is about measuring and recording an object’s acceleration. The measurement is performed via an embedded system based on the STM32 MCU family made by ST Microelectronics. Specifically the system is the STM32-103STK micro controller made by Olimex. At the beginning of this thesis, the description of the main attributes and features of STM32 processor are stated, and then the available development environments for building and debugging embedded applications. Next the methodology used to develop the embedded application is described. Specifically, the system is programmed to measure the 3-axis applied acceleration and after presenting the values through the monitor, it stores them into a SD (Secure Digital) card.

Pesquisas em Interfaces Naturais, sub-área da Computação Ubíqua, investigam o uso de dispositivos não-tradicionais para possibilitar a interação entre usuários e aplicaçõs de maneiras menos intrusivas (gestos, voz e escrita baseada em tinta eletrônica, por exemplo). Com o aumento da popularidade de dispositivos equipados com sensores de aceleração, os desenvolvedores agora dispõem de um novo dispositivo que pode ser utilizado para prover interação entre usuários e diferentes aplicações, como por exemplo as que se encontram presentes em ambientes de TV interativos. Assim, aplicações que fazem uso de acelerômetros vêm sendo desenvolvidas para situações específicas, e suas implementações e formatos de dados manipulados são dependentes do domínio para o qual foram projetados. Este trabalho apresenta um modelo para a formalização do modo como esses dados podem ser manipulados, por meio de uma abordagem genérica e extensível. Além disso, o modelo permite a descrição de regras para agregação de valor a estes dados por meio da adição de significados. Isto e obtido com a proposta de uma arquitetura em camadas que possibilita a estruturação e compartilhamento desses dados de modo flexível. Três protótipos foram implementados na linguagem de programação Java, fazendo-se uso dessa arquitetura e de uma API desenvolvida para facilitar o uso do modelo. Essas implementações demonstram a viabilidade do modelo proposto como solução para a questão da interoperabilidade nos cenários ilustrados, e para a extensibilidade dos dados, nos casos em que uma mudança de requisitos faz-se necessária / Research in Natural Interfaces, sub-area of Ubiquitous Computing, investigates the use of non-traditional devices to support user interaction with applications in less intrusive ways (gestures, voice and writing based on electronic ink, for instance). With the increasing popularity of accelerometers, developers now have another tool that can be used to provide interaction between users and different applications, such as interactive TV environments. However, applications that make use of accelerometers are currently being developed for specific situations, and their implementations and handled documents are also dependent on the domain for which they were designed. This work aims to propose a model to formalize how the accelerometer data may be handled in a generic way. In addition, the model enables the description of rules to aggregate value to these data through the addition of meanings. This is done by proposing a layered architecture to structure and share data in a exible way. Three prototypes were implemented in the Java programming language, making use of this architecture and an API designed to facilitate the model implementation. These prototypes demonstrate the feasibility of the model proposed as a solution to the issue of interoperability in the scenarios illustrated, and the problem of data extensibility, whenever a change of requirements poses necessary

Orientador: Antonio Augusto Fasolo Quevedo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-21T20:36:43Z (GMT). No. of bitstreams: 1 Ferri_CarlosAlexandre_M.pdf: 3581178 bytes, checksum: 205686fbe0768dc0e89e77aa54ae670f (MD5) Previous issue date: 2012 / Resumo: Nas últimas décadas, o uso de estimuladores de nervos periféricos tem sido disseminado entre os médicos anestesiologistas. Esses equipamentos ajudam a posicionar a agulha com maior precisão em bloqueios periféricos, reduzindo o risco de lesões nos nervos, melhorando a qualidade dos bloqueios e minimizar a necessidade de doses complementares de anestésico. Contudo, os equipamentos atuais necessitam que o usuário ajuste manualmente a intensidade do estímulo. Deste modo, na maior parte das vezes, o médico necessita da ajuda de outro profissional. Este trabalho objetiva avaliar a aplicabilidade clínica de um estimulador automatizado de nervo periférico, dando total autonomia ao anestesiologista, possibilitando que, mesmo sozinho, possa realizar todos os procedimentos, com auxílio do estimulador, sem dificuldade. O aparelho desenvolvido ajusta automaticamente os níveis de corrente através de um sistema realimentado via acelerometria, permitindo que o anestesiologista se preocupe apenas com a introdução da agulha. Para facilitar o uso pelo médico, as informações em relação à identificação de resposta motora são fornecidas via display LCD e avisos sonoros. Os testes foram realizados em duas etapas: na primeira, o equipamento foi testado em malha aberta (controlado manualmente, como os estimuladores normalmente disponíveis no mercado), pois a finalidade era coletar a resposta muscular, atividade mioelétrica (eletromiografia) e mecânica (acelerometria), evocada pela estimulação nervosa; na segunda, após análise dos dados coletados na etapa anterior (foi escolhido o acelerômetro como melhor técnica para realimentação), o equipamento foi testado com controle automático, a fim de verificar sua eficácia e precisão, quando comparado com o método de controle manual / Abstract: In the last decades, the use of peripheral nerve stimulators has been broadcast among anesthesiologists. This equipment help placing the needle with greater accuracy in the peripheral block, reducing the risk of nerve damage to the nerves, improving the quality of peripheral nerve blocks and minimizing the need for additional doses of anesthetics. However, cur-rent equipment requires the user to manually adjust the intensity of the stimulus. Thus, in most cases, the doctor needs help from other professional. This study aims to evaluate the clinical applicability of an automated peripheral nerve stimulator, giving full autonomy to the anesthesiologist, enabling him or her, even alone, to perform all procedures, with the help of the stimulator, without difficulty. The developed device automatically adjusts the levels of current through a feedback system via accelerometry, allowing the anesthesiologist to worry only about needle in-sertion. For ease of use by the medical staff, the information regarding the identification of motor response is provided via LCD display and warning sounds. Tests were conducted in two phases: first, the equipment was tested in open loop (controlled manually, just like as stimulators usually available on the market), because the purpose was to collect electric (EMG) and mechanical (accelerometry) muscular response evoked by nerve stimulation; in the second phase, after analysis of the data collected in the previous stage (accelerometer was chosen as the best technique for feedback), the equipment was tested with automatic control, to verify its efficiency and accuracy when compared to the manual control method / Mestrado / Engenharia Biomedica / Mestre em Engenharia Elétrica

The theoretical part of this thesis focus on the description of the piezoelectric accelerometers and their use for the impact measurements. It also characterizes the construction and the calibration process of the impact hammers with the use of the piezoelectric accelerometers. The practical part describes the place of calibration with the calibration tools, identifies the source of the oscillations on the output signal of the accelerometer and suggests its compensation. Part of the thesis is a service program for the impact measurement, analysis and the impact hammer calibration. Thesis also describes the methodology of the calibration and quantifies the measurement uncertainty.

A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial ful lment of the requirements for the degree of Master of Science in Engineering. Johannesburg, 2015 / Control of systems are important in most industrial sectors, they nd applications in electronics, machine design and navigation. These control systems often use sensors to work e ectively. One such sensor is an accelerometer, which is used to measure acceleration with one or more degrees of freedom. This research report investigates the modelling, system identi cation and controller design for an accelerometer, a Fibre Optic Accelerometer (FOA). Such a device may be applied in many applications such as anti-skid control, structural failure in buildings and bridges, as well as strategic missile guidance. This report presents a model of a FOA demonstrator which crudely models an industrially developed accelerometer, the demonstrator is made of a jig consisting of a guitar string and electromagnets. Such a model needs to account for a distributed parameter beam combined with a permanent magnet and four electromagnets. The guitar string is modelled using three beam models, namely a spring/damper model, an Assumed Modes Model (ASM) and a Transfer Function Model (TFM). The parameters for these beam models are identi ed using the Nelder-Mead simplex algorithm and the least squares method. The electromagnets within the jig, are modelled using a mathematical model obtained through curve tting of experimental data. The overall FOA sensor is optimised using a lead-lag controller. Five cost functions where investigated, these cost functions are H1, Integral Square Error (ISE), Integral Absolute Error (IAE), Integral Time Square Error (ITSE) and Integral Absolute Time Error (IATE). It was found that the guitar string may be modelled using a single degree of freedom beam model. This is based on a number of reasons, such as the aperture size - through which the tip Light Emitting Diode (LED) projects, the tip mass (permanent magnet) - acting as a natural damper and the fact that Position Sensing Device (PSD) only measures the tip position. It was found that a single degree of freedom model in two orthogonal axes, with a single link beam spring/damper model was the most suitable representation of the guitar string. And the IAE lead-lag controller was found to be the most e ective in controlling a guitar string, this e ectiveness was due to least settling time. / MT2017

A major method in object tracking systems and other inertial measurement devices resolves around the use of one, two, or three axis accelerometers. A leader in the field such devices is Microstrain Incorporated. They have developed a three axis accelerometer that uses a three axis magnetic sensor array to compute the pitch, roll, and yaw of a compact inertial measurement unit. In researching such devices, it became apparent that data collected using such units is extremely sensitive both to local magnetic fields and human interactions with the devices. It is therefore of great importance to ensure the device or devices are properly calibrated. In the construction of an effective calibration program, it is necessary to measure and zero out even minor discrepancies, as even small misalignments have deleterious effects on device performance.

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