Design of the Annular Suspension and Pointing System (ASPS) (including design addendum)

The Annular Suspension and Pointing System is an experiment pointing mount designed for extremely precise 3 axis orientation of shuttle experiments. It utilizes actively controlled magnetic bearing to provide noncontacting vernier pointing and translational isolation of the experiment. The design of the system is presented and analyzed

Industrial flow measurement

This thesis discusses the intrinsic worth of a published work, ‘Industrial Flow Measurement’ (Appendix A), a handbook written and revised by the author over a period of 30 years. The author first discusses the need to measure flow and then moves on to the raison d’être of the handbook before looking at a brief history of flow measurement. Although not claiming that any single attribute of the handbook is unique, the author nonetheless postulates that because it incorporates several distinctive features, at a number of different levels, these agents combine to make it one-of-a- kind. The author moves on to an overview of existing flow metering technologies discussed within the handbook. Finally, he looks at what he considers is a major gap in the collected body of knowledge – the field of multiphase and water-cut metering and provides a justification, not only for its inclusion in the future but for future investigation

NASA Tech Briefs, August 1994

Topics covered include: Computer Hardware; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences; Life Sciences; Books and Reports

Cumulative Index to NASA Tech Briefs, 1963 - 1966

Cumulative index of NASA Tech Briefs dealing with electrical and electronic, physical science and energy sources, materials and chemistry, life science, and mechanical innovation

ANALYSIS AND APPLICATION OF CAPACITIVE DISPLACEMENT SENSORS TO CURVED SURFACES

Capacitive displacement sensors have many applications where non-contact, high precision measurement of a surface is required. Because of their non-contact nature they can easily measure conductive surfaces that are flexible or otherwise unable to be measured using a contact probe. Since the output of the capacitance gage is electrical, data points can be collected quickly and averaged to improve statistics. It is often necessary for capacitive displacement sensors to gage the distance from a curved (non-flat) surface. Although displacements can easily be detected, the calibration of this output can vary considerably from the flat case. Since a capacitance gage is typically factorycalibrated against a flat reference, the experimental output contains errors in both gain and linearity. A series of calibration corrections is calculated for rectifying this output. Capacitance gages are also limited in their overall displacement travel. A support stage is described that, along with control electronics, allow the properties of the capacitance gage to be combined with an interferometer to overcome this displacement limitation. Finally, an application is proposed that would make use of the capacitance sensor and support stage assembly

Cumulative index to NASA Tech Briefs, 1963-1967

Cumulative index to NASA survey on technology utilization of aerospace research outpu

The 12th Aerospace Mechanisms Symposium

Mechanisms developed for various aerospace applications are discussed. Specific topics covered include: boom release mechanisms, separation on space shuttle orbiter/Boeing 747 aircraft, payload handling, spaceborne platform support, and deployment of spaceborne antennas and telescopes

Third International Symposium on Magnetic Suspension Technology

In order to examine the state of technology of all areas of magnetic suspension and to review recent developments in sensors, controls, superconducting magnet technology, and design/implementation practices, the Third International Symposium on Magnetic Suspension Technology was held at the Holiday Inn Capital Plaza in Tallahassee, Florida on 13-15 Dec. 1995. The symposium included 19 sessions in which a total of 55 papers were presented. The technical sessions covered the areas of bearings, superconductivity, vibration isolation, maglev, controls, space applications, general applications, bearing/actuator design, modeling, precision applications, electromagnetic launch and hypersonic maglev, applications of superconductivity, and sensors

Instrumentation, Electrical Drive Specification and Software Concept for an Electro-Hydrostatic Subsea Valve Actuator

TCC(graduação) - Universidade Federal de Santa Catarina. Centro Tecnológico. Engenharia de Controle e Automação.A Bosch Rexroth AG é uma companhia de engenharia especializada em acionamento e controle de todo porte, para aplicações industriais e móveis. Atualmente ela é a unidade de Negócios de Tecnologia da Automação da Robert Bosch GmbH, sendo uma subsidiária integral da última. Dentre os setores industriais da companhia, o setor Marine & Offshore desenvolve soluções de atuação e controle nos processos de exploração e produção de petróleo e gás offshore, também na instalação, comissionamento e decomissionamento de plataformas e turbinas eólicas offshore. Recentemente, com mais descobertas de campos petrolíferos em águas profundas (> 1000 m de profundidade), novas tecnologias buscam reduzir os custos da extração e maximizar a produção. Para isso, uma tendência no setor está propendendo em transferir a infraestrutura das plataformas na superfície para o fundo do mar. No entanto, as elevadas pressões, grandes distâncias de transmissão de energia/informação e o ambiente quimicamente agressivo da zona batipelágica, são alguns dos grandes desafios no desenvolvimento da tecnologia para este setor. Neste trabalho será proposto um novo conceito de um atuador compacto eletro-hidrostático para válvulas em árvores de Natal molhadas, manifold e chokes. Primeiramente será dado uma perspectiva geral da exploração de petroléo offshore e será ilustrado o estado da arte dos atuadores no mercado, e as vantagens do projeto proposto sobre as tecnologias atuais. Finalmente, serão explicadas as metodologias de projeto utilizadas no decorrer do trabalho. No capítulo seguinte serão esclarecidos todos os requisitos de projeto, os quais foram definidos à partir de uma descrição da aplicação, amparado em normas internacionais de engenharia, padrões internos da Bosch Rexroth, e acordos entre os parceiros de desenvolvimento de projeto. O terceiro capítulo cobrirá a etapa de especificação e seleção dos atuadores, transdutores e demais elementos eletro-eletrônicos que compõem todas as partes do sistema, bem como a elaboração dos mecanismos do sistema elétrico. Nesta seção também serão descritos os sistemas de acionamento elétrico e monitoramento do sistema. O início do desenvolvimento conceitual do software para o controle e interface do sistema será descrito no capítulo quatro. Nele serão descritos através de diagramas formais a arquitetura básica, o funcionamento do software, a abstração do sistema, e a funções necessárias para cumprir os requisitos de projeto. Os resultados da avaliação do cumprimento dos requisitos através das soluções propostas serão discutidos no quinto capítulo. Por fim, este documento se concluirá com uma breve explanação dos trabalhos futuros para a finalização do projeto como um todo.Bosch Rexroth AG is an engineering company specialized in drive and control technologies, including for the Marine & Offshore industry. Recently, with the growing discovery of oil and gas fields in deep waters (> 1000 meters depth), new technologies seek to reduce the extraction costs and maximize production. To achieve these goals, a trend in the sector is transferring the surface infrastructure to the seabed. However, the high pressure, long distances of energy and material transport and the chemically harsh environment of the bathypelagic zone are great challenges to overcome while developing technologies for this sector. In this thesis, it is exhibited a proposition of a novel concept of compact electro-hydrostatic valve actuators for subsea Christmas trees, manifolds and chokes. It’s illustrated the state of art in valve actuators available in the market and the advantages of the proposed project over the current technologies. This work focuses primarily in the synthesis of the electrical drive system design, the system instrumentation and the control software concep