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301.
In order to investigate ways of reducing vibrations of building structures subjected to excitation acting on intermediate storey, active vibration controls are conducted with active control devices installed on different floors of the structure, and the effective location of control devices is also investigated. In this paper, we propose a new ‘Discrete‐Optimizing Control Method’ for vibration control. The control forces are determined analytically which makes the ‘discrete‐index function’ minimum. Through numerical simulation, the Discrete‐Optimizing Control Method is proved to be an effective control method. The response reduction effects are best when the control devices are concentrated on the adjacent three floors of the vibration source. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
302.
The outer shelf of Funka Bay, located at the bay head of Hidaka Bay, is a recognised main winter spawning ground for walleye
pollock (Theragra chalcogramma), whose newly hatched juveniles migrate eastward along the Hidaka shelf to the nursery ground located in the Doto area. To
examine the seasonal change of the coastal current along this migration route, four current moorings were deployed along the
shelf in Hidaka Bay from April, 2004 to June, 2006. Since these mooring sites were close to the coast, the circulation was
estimated after removal of the wind-driven component. It was found that the winter coastal flow, forced by a north-westerly
monsoon wind, is clockwise along the Hidaka shelf. However, this flow is weak due to the superimposition of the opposite Coastal
Oyashio flow trapped on the shelf. In summer, a bifurcation of the coastal current occurs along the north-eastern Hidaka shelf
with a south-eastward flow, associated with the Tsugaru Gyre, and a north-westward flow, consisting of a branch from this
gyre. Our results provide a new understanding of the migration of juvenile walleye pollock: (1) very slow transport of juveniles
along the Hidaka shelf from winter to spring, and (2) selection of earlier spawning survivors due to the bifurcated flow in
early summer. 相似文献