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  • 1
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    Physiology. Walking made simple (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-04-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alexander, R McNeill -- New York, N.Y. -- Science. 2005 Apr 1;308(5718):58-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biology, University of Leeds, Leeds LS2 9JT, UK. r.m.alexander@leeds.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15802589" target="_blank"〉PubMed〈/a〉
    Keywords: Biomechanical Phenomena ; Energy Metabolism ; Gravitation ; Humans ; Models, Anatomic ; Oxygen Consumption ; *Robotics ; *Walking/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Evolution. Enhanced: A rodent as big as a buffalo (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-09-23
    Description: The largest living rodent is the South American capybara, a creature the size of a sheep that unlike smaller rodents stands on relatively straight legs. However, as Alexander explains in his Perspective, a new fossil find in Venezuela (Sanchez-Villagra et al.) reveals that the capybara would be dwarfed by Phoberomys, a giant rodent the size of a buffalo that lived during the Miocene Epoch.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alexander, R McNeill -- New York, N.Y. -- Science. 2003 Sep 19;301(5640):1678-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pure and Applied Biology, University of Leeds, Leeds LS2 9JT, UK. r.m.alexander@leeds.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14500968" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Body Constitution ; Body Weight ; Diet ; Energy Metabolism ; Femur/anatomy & histology ; Fermentation ; *Fossils ; Hindlimb/anatomy & histology ; Locomotion ; Rodentia/*anatomy & histology/metabolism ; Tooth/anatomy & histology ; Venezuela
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Parametric identification of a vibratory system with a clearance (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: An analytical and experimental investigation of a vibratory system with a clearance was conducted. A finite element model and an equivalent single-degree-of-freedom closed-form solution were used to determine the dynamic parameters and response of an experimental structure interacting with a gap. The closed-form solution is obtained by taking advantage of the piecewise linearity of the system. Results from these solution methods are in agreement with experimental data. The results also suggest that the closed-form solution approximates the response of the experimental structure with accuracy greater than that of the finite element model. The closed-form solution was also used to determine the gap size of the structure. The parameter identification procedure utilized in this study appears to be simple to use and can be readily extended to other types of piecewise-linear multi-degree-of-freedom systems.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME, Transactions, Journal of Vibration and Acoustics (ISSN 0739-3717); 115; 1; p. 25-32.
    Format: text
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  • 4
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    Piezoelectric pushers for active vibration control of rotating machinery (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The active control of rotordynamic vibrations and stability by magnetic bearings and electromagnetic shakers was discussed extensively in the literature. These devices, though effective, are usually large in volume and add significant weight to the stator. The use of piezoelectric pushers may provide similar degrees of effectiveness in light, compact packages. Analyses are contained which extend quadratic regulator, pole placement and derivative feedback control methods to the prescribed displacement character of piezoelectric pushers. The structural stiffness of the pusher is also included in the theory. Tests are currently being conducted at NASA Lewis Research Center with piezoelectric pusher-based active vibration control. Results performed on the NASA test rig as preliminary verification of the related theory are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA, Lewis Research Center, Rotordynamic Instability Problems in High-Performance Turbomachinery, 1988; p 87-110
    Format: application/pdf
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  • 5
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    Test and theory for piezoelectric actuator-active vibration control of rotating machinery (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The application of piezoelectric actuators for active vibration control (AVC) of rotating machinery is examined. Theory is derived and the resulting predictions are shown to agree closely with results of tests performed on an air turbine driven-overhung rotor. The test results show significant reduction in unbalance, transient and sub-synchronous responses. Results from a 30-hour endurance test support the AVD system reliability. Various aspects of the electro-mechanical stability of the control system are also discussed and illustrated. Finally, application of the AVC system to an actual jet engine is discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: Biennial ASME Conference on Mechanical Vibration and Noise; Sept. 17-21, 1989; Montreal; Canada
    Format: text
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