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Nonlinear heave dynamics of an air cushion vehicle bag and finger skirt

作者:科技文献资料网 时间:2018-10-15 16:36:12  浏览:8527   来源:科技文献资料网
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[唯一标识符]:CDSITC.AEROSPACE.A96-35012
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1996-35012; Reference AN: A96-35012
[标题]:Nonlinear heave dynamics of an air cushion vehicle bag and finger skirt
[作者]:Chung J; Sullivan P A; Ma T
[书名]:IN: AIAA Flight Simulation Technologies Conference, San Diego, CA, July 29-31, 1996, Technical Papers (A96-35001 09-01), Reston, VA, American Institute of Aeronautics and Astronautics, 1996, p. 102-112
[文摘]:The flexible skirt system used almost exclusively on large amphibious air cushion vehicles is the bag-and-finger skirt, but little information on its dynamical properties is available in the journal literature. We describe results of an analysis of the nonlinear heave dynamics of a simplified configuration chosen specifically to allow formulation from first principles. The skirt mass is lumped in the fingers, with the bag being modelled a combination of massless inelastic membranes and links. Air flow processes are assumed quasisteady, and the bag and cushion volumes are modelled as lumped pneumatic capacitances. The modulation of cushion air escape by skirt-surface contact is also included. The numerical results show that nonlinear effects occur at wave input amplitudes expected to be encountered in practice. At a given frequency, input amplitude increase causes jumps in heave response, period doubling, and chaos. Furthermore, a typical configuration shows a resonance at frequencies at which humans are most sensitive. One solution to this problem may be to reduce skirt mass. (Author)
[关键词]:GROUND EFFECT MACHINES; FLEXIBLE BODIES; AIR BAG RESTRAINT DEVICES; DYNAMIC CHARACTERISTICS; EQUATIONS OF MOTION; SKIRTS ; MASS DISTRIBUTION; FINGERS ; FLUID DYNAMICS
[出版年份]:1996
[专业领域]:ENGINEERING GENERAL
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[唯一标识符]:CDSITC.CANADADR.32469
[文献来源]:加拿大发展研究报告(CanadaDRS)
[文献类型]:科技报告
[资源原始索取号]:81-01464
[标题]:CALIBRATION OF RADIAC CALIBRATOR TYPE AN/UDM-1A
[作者]:Jones, E.W.; Benyon, D.E.
[机构]:Defence Research Establishment Ottawa, Ottawa ONT (CAN)
[出版单位]:Defense R&D Department Canada
[文摘]:The Radiac Calibrator type AN/UDM-1A has recently been acquired and installed at 9 Canadian Forces Bases across Canada and in Europe. The AN/UDM-1A Calibrator is 120 Ci of 137Cs and provides the required gamma radiation fields for the calibration of CF radiac equipment. The report provides a detailed description of the calibrator and method of the measurement of the gamma fields.
[出版时间]:15 Oct 1980
[出版年份]:1980
[报告号]:TN-80-14;
[页码]:22
[总页数]:0
[唯一标识符]:CDSTIC.DOE.6050965
[文献来源]:美国能源部报告数据库
[文献类型]:科技报告
[资源原始索取号]:OSTI ID: 6050965; Legacy ID: TI85004254
[标题]:Fermilab Tevatron quadrupoles
[作者]:Cooper, W.E.; Fisk, H.E.; Gross, D.A.; Lundy, R.A.; Schmidt, E.E.; Turkot, F.
[机构]:Fermi National Accelerator Lab., Batavia, IL (USA)
[文摘]:Details on the design, construction, and performance tests of Energy Saver/Doubler quadrupoles are presented along with recent data from the test of a special high gradient low beta prototype quadrupole.
[关键词]:43 PARTICLE ACCELERATORS; SUPERCONDUCTING MAGNETS; SPECIFICATIONS; TEVATRON; BEAM FOCUSING MAGNETS; FERMILAB ACCELERATOR; QUADRUPOLES; ACCELERATORS; CYCLIC ACCELERATORS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; EQUIPMENT; MAGNETS; MULTIPOLES; SUPERCONDUCTING DEVICES; SYNCHROTRONS
[出版时间]:1983 Mar 01
[出版年份]:1983
[报告号]:FNAL-TM-1183
[合同号]:AC02-76CH03000
[来源]:Technical Report
[来源关系]:Other Information: Paper copy only, copy does not permit microfiche production
[其他获取途径]:NTIS, PC A02; 3.
[国别]:United States
[总页数]:6



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