2018 Fiscal Year Final Research Report

Investigations on a Colloidal Damper Destined to the Carbody Horizontal Suspension of a Bullet Train

Research Project

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Project/Area Number	16K06059
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Design engineering/Machine functional elements/Tribology
Research Institution	Fukuoka Institute of Technology
Principal Investigator	SUCIU Barenten 福岡工業大学, 工学部, 教授 (20412611)
Research Collaborator	KITAURA Junya KINOSHITA Ryoichi MIYAMURA Akio KOJIMA Ryou OCHIAI Tohru KAWAGUCHI Kazuki DOI Kensei KURIBAYASHI Yuuki OHMURA Yuya TAKEDA Kosuke
Project Period (FY)	2016-04-01 – 2019-03-31
Keywords	ダンピング / 横懸架装置 / 鉄道・新幹線車両 / 乗心地評価 / 動的蛇行動 / 疑似蛇行動 / 直線・曲線レール / 車軸の安定性
Outline of Final Research Achievements	Pseudo-hunting was produced by employing a reduced-scale railway vehicle running on curved rails. Two redesigned wagons, to include seats for the operator, are equipped with horizontal dampers, and a connecting yaw damper. Relationship between the rails curvature and the damper stroke was clarified. Negative damping related to the hunting motion of the wheel axle, was explained by a generalized dynamic model. Influence of the travelling speed, wheel conicity, mass and density of the wheel axle, creep ratio, and the ratio of the track span to the yawing diameter, on the damping ratio as well as on the damped natural frequency, is illustrated. Roots nature of the characteristic equation is discussed, relative to the critical speed of the bullet train. Although the roots nature has no influence on the damping ratio, the degree of instability severely increases at augmentation of the train speed, and at reduction of the creep ratio.
Free Research Field	工学
Academic Significance and Societal Importance of the Research Achievements	蛇行動の負減衰メカニズムの解明、横コロイダルダンパに必要な正減衰の決定、ならびに乗客の読み・書き作業に関連する重み関数の適切な見直しにより新幹線車両の速度上昇と同時に安定性と快適性を高めることが期待される。具体的な研究成果として、査読付論文：13件、国際会議発表：11件、国内研究発表：14件、学会賞の受賞：7件、特許登録：2件が挙げられる。