NDLI: Study on the Simplified Method of Special Supporting Structure for Steam Generator Tubes

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Study on the Simplified Method of Special Supporting Structure for Steam Generator Tubes

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tan, Wei Jiang, Songyuan Li, Zhao Jia, Zhanbin Liu, Liyan
Copyright Year	2018
Abstract	The flow induced vibration of tubes in the steam generator gradually attracts great attention. The natural frequency of the tube is the basic parameter for vibration analysis. The supporting structures of the tube bundle in steam generator are the cinquefoil orifice-baffle and the anti-vibration bar which is different from the common baffle plate. The issue that researchers focus on is how these supporting structures affect the natural frequency. A simplified method of the special support in the tube bundle was studied based on the numerical simulation. According to the characteristics of supporting structures, the effect of stiffness of the supporting structures on the natural frequency was studied by the spring element constraints. The results show that when the stiffness of the support structure is larger than the magnitude of 105 N/m, the stiffness has no influence on the natural frequency. The frictional force of the circumferential constraint inside the plane is too weak to constrain the tube so we need to pay more attention on the vibration inside the plane. Through changing the contact length of the support component and tubes, the effect of the contact condition on the natural frequency is studied. The results show that the contact condition has a certain effect on the natural frequency. When the support is simplified as simple support, the influence on natural frequency is small and the deviation is less than 1.5%. And there is a certain safety margin under the simplified method. In the calculation process, the special support can be simplified as simple support and the calculation results are relatively accurate and conservative.
Sponsorship	Pressure Vessels and Piping Division
File Format	PDF
ISBN	9780791851654
DOI	10.1115/PVP2018-84349
Volume Number	Volume 4: Fluid-Structure Interaction
Conference Proceedings	ASME 2018 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2018-07-15
Publisher Place	Prague, Czech Republic
Access Restriction	Subscribed
Subject Keyword	Vibration Computer simulation Flow-induced vibrations Boilers Stiffness Safety Springs Vibration analysis
Content Type	Text
Resource Type	Article

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