Desarrollo de dispositivos de bajo costo para medición de vibraciones mecánicas PDF Download

Author: Roberto Esteban Riquelme Sáez
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Languages : es
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Author: Juan Fernando López López
Publisher:
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Languages : es
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Las vibraciones mecánicas, como herramienta de diagnóstico de fallas en máquinas y procedimiento de mantenimiento predictivo, han sido ampliamente estudiadas en los últimos años por la industria privada y por numerosas universidades del mundo entero. Uno de los puntos neurálgicos en este continuo desarrollo del análisis de vibraciones mecánicas, es la técnica de procesamiento a utilizar. La transformada de Fourier se destaca como la principal técnica utilizada debido a los buenos resultados que hasta la fecha ha proporcionado a los técnicos encargados del mantenimiento en la industria y del análisis de dichas señales. El siguiente paso en el análisis de vibraciones es encontrar una forma de automatizar el proceso de diagnóstico de falla en máquinas rotativas y este proyecto tiene el propósito de desarrollar una metodología que permita acercar ese objetivo final. En este proyecto para el desarrollo de una metodología de análisis empleando transformaciones tiempo-frecuencia, en primera medida se obtienen las bases de datos de las señales de vibración de un motor eléctrico con desbalanceo y en buen estado, una base de datos de fallas en rodamientos y una base de datos de fallas en máquinas rotativas proporcionada por Smurfit Kappa Cartón de Colombia S.A. Se definen 6 metodologías de análisis en las cuales se realiza el preprocesamiento de las señales haciendo el filtrado por umbralizado wavelet y se estudia la estacionariedad de la señales empleando el Run test. En la etapa de extracción de características se utilizan las transformaciones de Fourier FFT y STFT, la transformada wavelet discreta, el análisis cepstrum y las distribuciones Wigner Ville y Choi Williams. Para tratar el problema de la alta dimensionalidad, se utiliza el análisis de componentes principales y se hace la clasificación utilizando clasificadores lineal y tipo Bayes. Para las señales de desbalanceo se obtiene una mejor clasificación empleando la transformada wavelet con 99,5% de aciertos en ..

Author: E. Valsami-Jones
Publisher: IWA Publishing
ISBN: 1843390019
Category : Science
Languages : en
Pages : 681

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Phosphorus in Environmental Technology: Principles and Applications, provides a definitive and detailed presentation of state-of-the-art knowledge on the environmental behaviour of phosphorus and its applications to the treatment of waters and soils. Special attention is given to phosphorus removal for recovery technologies, a concept that has emerged over the past 5-6 years. The book features an all-encompassing approach: the fundamental science of phosphorus (chemistry, geochemistry, mineralogy, biology), key aspects of its environmental behaviour and mobility, industrial applications (treatment, removal, recovery) and the principles behind such applications, novel biotechnologies and, importantly, it also addresses socio-economic issues which often influence implementation and the ultimate success of any new technology. A detailed subject index helps the reader to find their way through the different scientific and technological aspects covered, making it an invaluable reference work for students, professionals and consultants dealing with phosphorus-related environmental technologies. State-of-the-art knowledge on the behaviour of phosphorus and its applications to environmental science and technology. Covers all aspects of phosphorus in the environment, engineered and biological systems; an interdisciplinary text.

Author: Sudhakar K. Venkatesh
Publisher: Springer
ISBN: 1493915754
Category : Medical
Languages : en
Pages : 143

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The first book to cover the groundbreaking development and clinical applications of Magnetic Resonance Elastography, this book is essential for all practitioners interested in this revolutionary diagnostic modality. The book is divided into three sections. The first covers the history of MRE. The second covers technique and clinical applications of MRE in the liver with respect to fibrosis, liver masses, and other diseases. Case descriptions are presented to give the reader a hands-on approach. The final section presents the techniques, sequence and preliminary results of applications in other areas of the body including muscle, brain, lung, heart, and breast.

Author: Peter Hall
Publisher: Wiley-Blackwell
ISBN: 9780631199434
Category : Social Science
Languages : en
Pages : 502

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Cities of Tomorrow is a critical history of planning in theory and practice in the twentieth century, as well as of the social and economic problems and opportunities that gave rise to it. Trenchant, perceptive, global in coverage, this book is an unrivalled account of its crucial subject. The third edition of Cities of Tomorrow is comprehensively revised to take account of abundant new literature published since its original appearance, and to view the 1990s in historical perspective. This is the definitive edition, reviewing the development of the modern planning movement over the entire span of the twentieth century.

Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005023
Category : Computers
Languages : en
Pages : 190

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Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.

Author: Steven M. Kaplan
Publisher: Taylor & Francis US
ISBN: 9780415587747
Category : English language
Languages : en
Pages : 0

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The Routledge Spanish Bilingual Dictionary of Psychology and Psychiatry contains over 100,000 entries making this the most comprehensive and up-to-date dictionary of its kind. The Dictionary provides concise, comprehensive and current coverage of every word or phrase used in the study and practice of psychiatry and psychology. This valuable reference tool covers all disciplines and sub-disciplines, both research-based and clinical. This is a vital resource to those in the healthcare professions, to academicians and to those who work in translation and/or interpretation, healthcare and the law who are in contact with the English and Spanish speaking communities.

Author: Roslyn Weiss
Publisher: Oxford University Press, USA
ISBN: 0195116844
Category : Law
Languages : en
Pages : 200

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In this work, the author contends that contrary to prevailing notions, Plato's 'Crito' does not show an allegiance between Socrates & the state that condemned him. Weiss brings to light numerous indications that Socrates & the Laws are not partners.

Author: James Gleick
Publisher: Vintage
ISBN: 0307379574
Category : Science
Languages : en
Pages : 400

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From the bestselling author of the acclaimed Chaos and Genius comes a thoughtful and provocative exploration of the big ideas of the modern era: Information, communication, and information theory. Acclaimed science writer James Gleick presents an eye-opening vision of how our relationship to information has transformed the very nature of human consciousness. A fascinating intellectual journey through the history of communication and information, from the language of Africa’s talking drums to the invention of written alphabets; from the electronic transmission of code to the origins of information theory, into the new information age and the current deluge of news, tweets, images, and blogs. Along the way, Gleick profiles key innovators, including Charles Babbage, Ada Lovelace, Samuel Morse, and Claude Shannon, and reveals how our understanding of information is transforming not only how we look at the world, but how we live. A New York Times Notable Book A Los Angeles Times and Cleveland Plain Dealer Best Book of the Year Winner of the PEN/E. O. Wilson Literary Science Writing Award