The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane
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The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane
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Author :
language : en
Publisher:
Release Date : 1999
The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-09-17
The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-17 with Science categories.
Vibration acceleration levels on large space platforms exceed the requirements of many space experiments. The Microgravity Vibration Isolation Mount (MIM) was built by the Canadian Space Agency to attenuate these disturbances to acceptable levels, and has been operational on the Russian Space Station Mir since May 1996. It has demonstrated good isolation performance and has supported several materials science experiments. The MIM uses Lorentz (voice-coil) magnetic actuators to levitate and isolate payloads at the individual experiment/sub-experiment (versus rack) level. Payload acceleration, relative position, and relative orientation (Euler-parameter) measurements are fed to a state-space controller. The controller, in turn, determines the actuator currents needed for effective experiment isolation. This paper presents the development of an algebraic, state-space model of the MIM, in a form suitable for optimal controller design. The equations are first derived using Newton's Second Law directly; then a second derivation (i.e., validation) of the same equations is provided, using Kane's approach.Hampton, R. David and Tryggvason, Bjarni V. and DeCarufel, Jean and Townsend, Miles A. and Wagar, William O.Glenn Research CenterVIBRATION ISOLATORS; MATHEMATICAL MODELS; VIBRATION DAMPING; STRUCTURAL DESIGN; CONTROLLERS; STRUCTURAL VIBRATION; SPACECRAFT COMPONENTS; SPACEBORNE EXPERIMENTS; MICROGRAVITY; SPACE STATIONS; ACTUATORS; SUSPENSION SYSTEMS (VEHICLES); FEEDBACK CONTROL; SPACECRAFT EQUIPMENT
The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane Nasa Tm 1999 208906 Mar 26 1999
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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 1999*
The Microgravity Isolation Mount A Linearized State Space Model A La Newton And Kane Nasa Tm 1999 208906 Mar 26 1999 written by United States. National Aeronautics and Space Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999* with categories.
A Kane S Dynamics Model For The Active Rack Isolation System
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-05-29
A Kane S Dynamics Model For The Active Rack Isolation System written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-29 with categories.
Many microgravity space science experiments require vibratory acceleration levels unachievable without active isolation. The Boeing Corporation's Active Rack Isolation System (ARIS) employs a novel combination of magnetic actuation and mechanical linkages to address these isolation requirements on the International Space Station (ISS). ARIS provides isolation at the rack (International Standard Payload Rack (ISPR)) level. Effective model-based vibration isolation requires: (1) an appropriate isolation device, (2) an adequate dynamic (i.e., mathematical) model of that isolator, and (3) a suitable, corresponding controller. ARIS provides the ISS response to the first requirement. This paper presents one response to the second, in a state space framework intended to facilitate an optimal-controls approach to the third. The authors use "Kane's Dynamics" to develop a state-space, analytical (algebraic) set of linearized equations of motion for ARIS.Hampton, R. D. and Beech, G. S. and Rao, N. N. S. and Rupert, J. K. and Kim, Y. K.Marshall Space Flight CenterMATHEMATICAL MODELS; MICROGRAVITY; VIBRATION ISOLATORS; SPACEBORNE EXPERIMENTS; ISOLATION; VIBRATION; PAYLOADS; LINKAGES; ISOLATORS; INTERNATIONAL SPACE STATION; EQUATIONS OF MOTION; CONTROLLERS; ALGEBRA; ADVANCED RANGE INSTRUMENTATION SHIP
Glovebox Integrated Microgravity Isolation Technology G Limit A Linearized State Space Model
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-09-19
Glovebox Integrated Microgravity Isolation Technology G Limit A Linearized State Space Model written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-19 with Science categories.
Vibration acceleration levels on large space platforms exceed the requirements of many space experiments. The Glovebox Integrated Microgravity Isolation Technology (g-LIMIT) is being built by the NASA Marshall Space Flight Center to attenuate these disturbances to acceptable levels. G-LIMIT uses Lorentz (voice-coil) magnetic actuators to levitate and isolate payloads at the individual experiment/sub-experiment (versus rack) level. Payload acceleration, relative position, and relative orientation measurements are fed to a state-space controller. The controller, in turn, determines the actuator Currents needed for effective experiment isolation. This paper presents the development of an algebraic, state-space model of g-LIMIT, in a form suitable for optimal controller design. The equations are first derived using Newton's Second Law directly, then simplified to a linear form for the purpose of controller design.Hampton, R. David and Calhoun, Philip C. and Whorton, Mark S.Langley Research Center; Marshall Space Flight CenterMICROGRAVITY; VIBRATION; ISOLATION; TECHNOLOGY ASSESSMENT; MATHEMATICAL MODELS; SPACE PLATFORMS; SPACEBORNE EXPERIMENTS; PAYLOADS; CONTROLLERS; ACTUATORS
A Kane S Dynamics Model For The Active Rack Isolation System Part 3 Addition Of Umbilicals To The Nonlinear Model
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-05-30
A Kane S Dynamics Model For The Active Rack Isolation System Part 3 Addition Of Umbilicals To The Nonlinear Model written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-30 with categories.
In the late 1980s, microgravity researchers began to voice their concern that umbilical-transmitted energy could significantly degrade the acceleration environment of microgravity space science experiments onboard manned spacecraft. Since umbilicals are necessary for many experiments, control designers began to seek ways to compensate for these "indirect" disturbances. Hampton, et al., used the Kane s method to develop a model of the active rack isolation system (ARIS) that includes (1) actuator control forces, (2) direct disturbance forces, and (3) indirect, actuator-transmitted disturbances. Their model does not, however, include the indirect, umbilical-transmitted disturbances. Since the umbilical stiffnesses are not negligible, these indirect disturbances must be included in the model. Until the umbilicals have been appropriately included, the model will be incomplete. This Technical Memorandum presents a nonlinear model of ARIS with umbilicals included. Model verification was achieved by utilizing two commercial-off-the-shelf software tools. Various forces and moments were applied to the model to yield simulated responses of the system. Plots of the simulation results show how various critical points on an ARIS-outfitted international standard payload rack behave under the application of direct disturbances, indirect disturbances, and control forces. Simulations also show system response to a variety of initial conditions.Rupert, J. K. and Hampton, R. D. and Beech, G. S.Marshall Space Flight CenterMICROGRAVITY; SPACEBORNE EXPERIMENTS; ADVANCED RANGE INSTRUMENTATION SHIP; GRAVITATIONAL EFFECTS; MANNED SPACECRAFT; PROVING; ACTUATORS; NONLINEARITY; PAYLOADS; CRITICAL POINT
A New Approach To Active Vibration Isolation For Microgravity Space Experiments
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Author : Alok Sinha
language : en
Publisher:
Release Date : 1990
A New Approach To Active Vibration Isolation For Microgravity Space Experiments written by Alok Sinha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Reduced gravity experiments categories.
The Microgravity Vibration Isolation Mount A Dynamic Model For Optimal Controller Design
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-10-06
The Microgravity Vibration Isolation Mount A Dynamic Model For Optimal Controller Design written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-06 with Science categories.
Vibration acceleration levels on large space platforms exceed the requirements of many space experiments. The Microgravity Vibration Isolation Mount (MIM) was built by the Canadian Space Agency to attenuate these disturbances to acceptable levels, and has been operational on the Russian Space Station Mir since May 1996. It has demonstrated good isolation performance and has supported several materials science experiments. The MIM uses Lorentz (voice-coil) magnetic actuators to levitate and isolate payloads at the individual experiment/sub-experiment (versus rack) level. Payload acceleration, relative position, and relative orientation (Euler-parameter) measurements are fed to a state-space controller. The controller, in turn, determines the actuator currents needed for effective experiment isolation. This paper presents the development of an algebraic, state-space model of the MIM, in a form suitable for optimal controller design. Hampton, R. David and Tryggvason, Bjarni V. and DeCarufel, Jean and Townsend, Miles A. and Wagar, William O. Glenn Research Center RTOP 963-60-0C
Equations Of Motion For The G Limit Microgravity Vibration Isolation System
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-09-15
Equations Of Motion For The G Limit Microgravity Vibration Isolation System written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-15 with Science categories.
A desirable microgravity environment for experimental science payloads may require an active vibration isolation control system. A vibration isolation system named g-LIMIT (GLovebox Integrated Microgravity Isolation Technology) is being developed by NASA Marshall Space Flight Center to support microgravity science experiments using the microgravity science glovebox. In this technical memorandum, the full six-degree-of-freedom nonlinear equations of motion for g-LIMIT are derived. Although the motivation for this model development is control design and analysis of g-LIMIT, the equations are derived for a general configuration and may be used for other isolation systems as well.Kim, Y. K. and Whorton, M. S.Marshall Space Flight CenterEQUATIONS OF MOTION; MICROGRAVITY; VIBRATION ISOLATORS; MATHEMATICAL MODELS; ACTIVE CONTROL; DEGREES OF FREEDOM; NONLINEAR EQUATIONS; DESIGN ANALYSIS; CONTROL THEORY
Microgravity Vibration Isolation
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher:
Release Date : 2018-10-23
Microgravity Vibration Isolation written by National Aeronautics and Space Adm Nasa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-23 with categories.
In order to achieve adequate low-frequency vibration isolation for certain space experiments an active control is needed, due to inherent passive-isolator limitations. Proposed here are five possible state-space models for a one-dimensional vibration isolation system with a quadratic performance index. The five models are subsets of a general set of nonhomogeneous state space equations which includes disturbance terms. An optimal control is determined, using a differential equations approach, for this class of problems. This control is expressed in terms of constant, Linear Quadratic Regulator (LQR) feedback gains and constant feedforward (preview) gains. The gains can be easily determined numerically. They result in a robust controller and offers substantial improvements over a control that uses standard LQR feedback alone. Hampton, R. D. and Knospe, C. R. and Grodsinsky, C. M. and Allaire, P. E. and Lewis, D. W. Glenn Research Center ...