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233 results on '"Tsujioka, K."'

11. In-vivo measurements of blood flow velocity profiles in canine ilio-femoral anastomotic bypass grafts

Author

Jones, S.A., Giddens, D.P., Loth, F., Zarins, C.K., Kajiya, F., Morita, I., Hiramatsu, O., Ogasawara, Y., and Tsujioka, K.

Subjects
Blood flow -- Measurement, Blood -- Circulation, Artificial, Dogs as laboratory animals -- Physiological aspects, Hemodynamics -- Analysis, Engineering and manufacturing industries, Science and technology
Abstract

In-vivo velocity profiles were recorded with a 20 MHz, 80-channel pulsed Doppler ultrasound velocimeter in canine end-to-side ilio-femoral anastomotic grafts. The geometries were obtained from casts of the anastomotic region, and flow rates were measured with electromagnetic flow probes. Three cases reported here include a 'standard' geometry, which was similar to previously studied in vitro models, a stenosed geometry, and a case with below average flow rate. Observed flow features include separation at the hood and toe, movement of the floor stagnation point, and skewed profiles in the proximal outflow segment. Out-of-plane curvature and lateral displacement of the anastomosis inlet appear to have a strong effect on the flow fields. In addition, compliance affects the instantaneous flow rates within the proximal and distal branches.

Published
1997

13. Integrated optimum design of structure and H control system

Author

Tsujioka, K., Kajiwara, I., and Nagamatsu, A.

Subjects
Structural design -- Analysis, Actuators -- Analysis, Structural analysis (Engineering) -- Analysis, Mathematical models -- Analysis, Aerospace and defense industries, Business
Abstract

The authors examine methods of optimum structure and control systems design. Topics include structural analysis, frequency responses, and actuators .

Published
1996

14. Approach for simultaneous optimization of a structure and control system

Author

Kajiwara, I., Tsujioka, K., and Nagamatsu, A.

Subjects
Control systems -- Design and construction, Stability -- Analysis, Aerospace and defense industries, Business
Abstract

A novel designing approach is used to suppress mechanical structure vibration to ensure stability related to higher-order natural modes. Even under the influence of white and colored noise, the vibration is maintained under control. The approach can work for a noncollocation control system. The approach uses a spatial model, the reduced modal model and the original modal model and is effective when applied on a steel plate.

Published
1994

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