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X ray CT Inspection Algorithm to Correct Missing Data
Toshiyuki Kaneko,Toshiyuki Tanaka,Kazuo Kikuchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
X ray CT is for nondestructive inspection in industrial field. In X ray CY inspection, the problem is called “metal artifact” on the reconstructed image is one of the biggest issue. This study aims to reduce metal artifact. Metal artifact is caused primarily by missing projection data from every projection angle. So ,we propose the algorithm for correcting the missing projection data and confirm availability for nondestructive inspection in industrial field.
An Experimental Study of the Nozzle Lip Thickness Effect on Supersonic Jet Screech Tones
Toshiyuki Aoki,Yong-Hun Kweon,Yoshiaki Miyazato,Heuy-Dong Kim,Toshiaki Setoguchi 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.4
It is well known that screech tones of supersonic jet are generated by a feedback loop driven by the instability waves. Near the nozzle lip where the supersonic jet mixing layer is receptive to external excitation, acoustic disturbances impinging on this area excite the instability waves. This fact implies that the nozzle lip thickness can influence the screech tones of supersonic jet. The objective of the present study is to experimentally investigate the effect of nozzle-lip thickness on screech tones of supersonic jets issuing from a convergent-divergent nozzle. A baffle plate was installed at the nozzle exit to change the nozzle-lip thickness. Detailed acoustic measurement and flow visualization were made to specify the screech tones. The results obtained obviously show that nozzle-lip thickness significantly affects the screech tones of supersonic jet, strongly depending on whether the jet at the nozzle exit is over-expanded or under-expanded.
Steel-beam-to-concrete-filled-steel-tube-column Moment Connections in Japan
Toshiyuki Fukumoto 한국강구조학회 2005 International Journal of Steel Structures Vol.5 No.5
With respect to the ductility of concrete-filled steel tube (CFT) columns, insuficient evaluation formulas are indicated incomparatively easy methods of calculating the relationship between shear forces and deflections of CFT columns underconstant axial loads. This paper attempts to initiate a formal formulation of a CDC method with the following characteristics:reduction factors of the compressive strength of inner concrete, the falling branches after the compresive strength, elevationsthat are suficiently accurate for engineering aplications.