Nobuhiro Nagata
Nagoya University
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Featured researches published by Nobuhiro Nagata.
ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference | 2009
Tsuyoshi Inoue; Nobuhiro Nagata; Yukio Ishida
Continuous operation of rotating machinery with a rotor crack is a risk condition since the rotor crack grows rapidly and may fail causing a catastrophic accident. This paper develops the finite element model of the rotating shaft with an open crack. The natural frequencies and the resonance curves of such a rotor system with an open crack is investigated, and the concise and accurate modeling of the open crack element is discussed. The natural frequencies and the resonance curves of the experimental system are measured for various positions and depths of the open crack. By comparing both the theoretical and experimental results, the accuracy of the developed simple finite element model of the rotating shaft with an open crack is clarified.© 2009 ASME
10th International Conference on Vibrations in Rotating Machinery#R##N#11–13 September 2012, IMechE London, UK | 2012
Nobuhiro Nagata; Tsuyoshi Inoue; Yukio Ishida
The vibration of the rotating shaft with an open crack under the harmonic excitation is investigated. The concise FEM rotating shaft model for the quantitative analysis, which was developed in the previous studies, is utilized, and the fundamental equations governing the vibration of the cracked shaft with the harmonic excitation are deduced. Furthermore, the experimental system using the active magnetic bearing for the harmonic excitation is developed, and the validity of the obtained theoretical results are confirmed experimentally.
ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference | 2011
Tsuyoshi Inoue; Nobuhiro Nagata; Yukio Ishida
This paper develops and improves the concise and general purpose oriented finite element rotating shaft model with an open crack for the quantitative analysis. Particularly, the case with the directional difference of the bearing support stiffness is focused. The theoretical analysis of both the natural frequency and the double-frequency vibration due to crack are performed. Both theoretical results are compared with the experimental results, and their quantitative agreement are confirmed.Copyright
Journal of System Design and Dynamics | 2010
Tsuyoshi Inoue; Masato Kato; Nobuhiro Nagata; Yukio Ishida
Transactions of the Japan Society of Mechanical Engineers. C | 2013
Nobuhiro Nagata; Tsuyoshi Inoue
Transactions of the Japan Society of Mechanical Engineers. C | 2012
Nobuhiro Nagata; Tsuyoshi Inoue
Transactions of the Japan Society of Mechanical Engineers. C | 2010
Tsuyoshi Inoue; Nobuhiro Nagata; Yukio Ishida
The Proceedings of the Dynamics & Design Conference | 2012
Nobuhiro Nagata; Tsuyoshi Inoue
The Proceedings of the Dynamics & Design Conference | 2011
Tsuyoshi Inoue; Nobuhiro Nagata; Yoshinori Kato
The Proceedings of the Dynamics & Design Conference | 2011
Nobuhiro Nagata; Tsuyoshi Inoue; Yukio Ishida
