2010 Fiscal Year Final Research Report

Study on the characteristic and the countermeasures against self-excited vibrations which are generated in the support part of high stack

Research Project

Project/Area Number	20560211
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Dynamics/Control
Research Institution	Saitama University
Principal Investigator	SATO Yuichi Saitama University, 大学院・理工学研究科, 教授 (30134828)
Co-Investigator(Kenkyū-buntansha)	NAGAMINE Takuo 埼玉大学, 大学院・理工学研究科, 准教授 (00323379) MORI Hiroki 埼玉大学, 大学院・理工学研究科, 助教 (50451737)
Project Period (FY)	2008 – 2010
Keywords	流体関連振動 / 自励振動 / 不安定振動
Research Abstract	To clarify the mechanism of observed violent vibration of a brace adjacent to a high circular stack, experimental study was performed. A test apparatus consists of a vertical flexible rod placed close to a large solid cylinder. Accordingly, airflow makes the rod whirl at its first natural angular frequency. Whirling motion grows as airflow velocity increases. Whirling direction depends on a relative location to the cylinder and not on airflow velocity. Further, analytical study was done by assuming the flow past the cylinder is frictionless, irrotational and incompressible. Analytical results show fairly good agreement with experimental ones as well as the actual brace vibration.

(5 results)