Download or read book A Low Cost DC coupled Active Vibration Isolation System written by Kevin Kar-Leung Miu and published by . This book was released on 2008 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, I designed and implemented an isolation system that interfaces with traditional air mounts for improved force disturbance rejection relative to passive optical tables.Force disturbance rejection and position alignment are two major functional requirements of vibration isolation systems. With conventional passive isolation systems, a tradeoff exists between improving force disturbance rejection maintaining ground vibration isolation. Commercial active isolators address such a tradeoff through the use of inertial sensors, but the AC-coupled nature of the sensors leads to an inconvenient low frequency response. By referencing a payload stiffly to a softly suspended proof mass, both of the aforementioned functional requirements can be resolved while maintaining ground disturbance isolation performance. Philips Applied Technologies originally developed the concept, named Advanced Isolation ModuleS (AIMS).The AIMS system uses a relative displacement measurement between a payload which is to be isolated from vibrations and a proof mass as feedback. The displacement sensor allows the inertial measurement to be DC-coupled. The objective of this research is to find a relatively low-cost approach for the AIMS concept.A 1-DOF active vibration isolation system based on closed loop control utilizing the DC-coupled inertial measurement as feedback was retrofitted onto an optical table. The coil of a commercial geophone was used as the proof mass, as the geophone provides a relatively inexpensive, low frequency suspension. Error budgeting was performed on the system to estimate and improve payload acceleration noise levels. The results yielded a system bandwidth of 30 Hz and a total system acceleration la value of approximately 1 mm/s2.
Download or read book Nineteenth Space Simulation Conference Cost Effective Testing for the 21st Century written by and published by . This book was released on 1997 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock and Vibration Bulletin written by and published by . This book was released on 1986 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Investigation on Active Passive Hybrid Isolation and Tunable Dynamic Vibration Absorption written by Fei Wang and published by Springer. This book was released on 2018-12-17 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses efforts to control the low-frequency vibration transmission of typical power equipment and pipeline systems of ships, exploring the use of active and passive hybrid vibration isolation and adjustable dynamic vibration absorption technologies. It also proposes an adaptive feed-forward control strategy and studies a distributed feed-forward control hardware system. In addition, the book presents a three-way dynamic vibration absorption theory used to design a pipeline-system adjustable dynamic vibration absorber, which offers a number of advantages, such as compact structure, easy assembly and disassembly, low power consumption, excellent vibration control effect and wide frequency band adjustable ability, etc. This book is a valuable resource for researchers and engineers in the fields of noise and vibration control, active control systems, active vibration isolation and adaptive dynamic vibration absorption.
Download or read book Near Earth Laser Communications written by Hamid Hemmati and published by CRC Press. This book was released on 2018-10-03 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invented more than a hundred years ago by Alexander Graham Bell, the technology of free-space optical communications, or lasercom, has finally reached the level of maturity required to meet a growing demand for operational multi-giga-bit-per-second data rate systems communicating to and from aircrafts and satellites. Putting the emphasis on near-earth links, including air, LEO, MEO, and GEO orbits, Near-Earth Laser Communications presents a summary of important free-space laser communication subsystem challenges and discusses potential ways to overcome them. This comprehensive reference provides up-to-date information on component and subsystem technologies, fundamental limitations, and approaches to reach those limits. It covers basic concepts and state-of-the-art technologies, emphasizing device technology, implementation techniques, and system trades. The authors discuss hardware technologies and their applications, and also explore ongoing research activities and those planned for the near future. The analytical aspects of laser communication have been covered to a great extent in several books. However, a detailed approach to system design and development, including trades on subsystem choices and implications of the hardware selection for satellite and aircraft telecommunications, is missing. Highlighting key design variations and critical differences between them, this book distills decades’ worth of experience into a practical resource on hardware technologies.
Download or read book IEEE ASME International Conference on Advanced Intelligent Mechatronics Proceedings written by and published by . This book was released on 1999 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technology for Large Space Systems written by and published by . This book was released on 1988 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Applications of Dynamics written by Dean C. Karnopp and published by John Wiley & Sons. This book was released on 2007-12-14 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: A GROUNDBREAKING TEXT THAT BRIDGES TEH GAP BETWEEN THEORTERICAL DYANICS AND INDUSTRY APPLICATIONS. Designed to address the perceived failure of introductory dynamics courses to produce students capable of applying dynamic principles successfully, both in subsequent courses and in practice, Engineering Applications of Dynamics adopts a much-needed practical approach designed to make the subject not only more relevant, but more interesting as well. Written by a highly respected team of authors, the book is the first of its kind to tie dynamics theory directly to real-world situations. By touching on complex concepts only to the extent of illustrating their value in real-world applications, the authors provide students with a deeper understanding of dynamics in the engineering of mechanical systems. Topics of interest include: * The formulation of equations in forms suitable for computer simulation * Simulation examples of real engineering systems * Applications to vehicle dynamics * Lagrange's equations as an alternative formulation procedure * Vibrations of lumped and distributed systems * Three-dimensional motion of rigid bodies, with emphasis on gyroscopic effects * Transfer functions for linearized dynamic systems * Active control of dynamic systems A Solutions Manual with detailed solutions for al problems in this book is available at the Web site, www.wiley.com/college/karnopp.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Active Vibration Isolation Systems for Severe Ground Transportation Environments written by Peter C. Calcaterra and published by . This book was released on 1969 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book System Identification of an Ultra Quiet Vibration Isolation Platform written by George D. Beavers and published by . This book was released on 1997-06-01 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis details the system identification and initial system validation of the an Ultra-Quiet Vibration Isolation Platform (UQP). With the move toward lighter and more flexible spacecraft, the effects of vibration are of immense concern. As natural or passive damping becomes less effective in controlling undesired vibrations, active vibration control becomes essential. The UQP uses a special configuration of the six degree of freedom Stewart Platform with piezoceramic strut actuators and geophone sensors. This combination gives an extremely sensitive and responsive six degree-of-freedom active vibration control system. Each actuator was designed to be controlled independently without coupling with other actuators. In order to develop control laws, the plant must be identified in terms of system zeros and poles and the uncoupled design validated. Dynamic modeling using parametric estimation methods can accurately describe a complex system. Using parameter estimation methods, models of the actuator system dynamics were obtained. A simple lead-lag controller was applied to individual actuators then all six actuators acting simultaneously to verify system coupling. Significant interaction between base adjoining actuators was discovered.
Download or read book Large Space Structures Systems in the Space Station Era written by and published by . This book was released on 1990 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Gravitational Wave Detectors written by D. G. Blair and published by Cambridge University Press. This book was released on 2012-02-16 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces the technology and reviews the experimental issues; a valuable reference for graduate students and researchers in physics and astrophysics.
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 1975 USAF ASEE Summer Faculty Research Program written by and published by . This book was released on 1975 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contenst: Research reports -- Design of a Subsonic Combustion Tunnel and Experimental Test Program; The Effect of Cobalt Hydroxide Coprecipitation in Nickel Hydroxide Electrodes; Overload Protection and Filtering Requirements for Phase Control Voltage Regulators; A Study on Numerical Methods for Computing Transonic Flows in Turbomachines; An Analysis of Varying Material Properties: A Measure of Damage; Continuous Performance Measurement of Manually Controlled Systems; Digital Autopilot design; Transient Thermal Analysis of External Stores; Analysis of Missile Control Systems; Digital Autopilot Design; Ohmic Contacts for Transferred Electron Devices; A Navigation Algorithm for the Low-Cost GPS Receiver; Electro-Optical Tracker Analysis; A Real Time Terminal Guidance Simulation Facility; Fatigue Crack Propagation in Laminated and Monolithic Aluminum Alloy Panels; RPV Ground Impact Attenuator Simulation; A Method for Investigating the Angular Vibration Response of a Structure; Analysis of Inherent Errors in Asynchronous Redundant Digital Flight Controls; Pattern Recognition Techniques Applied to Flat-Bottom Holes; Ultrasonic Techniques for Nondestructive Evaluation (NDE); Fracture of Graphite/Epoxy Composites; Optical Properties of Europium-Doped Pottasium Chloride Laser Window Materials.
Download or read book Second International Symposium on Magnetic Suspension Technology written by Nelson J. Groom and published by . This book was released on 1994 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
