No abstract

No abstract

No abstract

No abstract

With rapid advances of rotating machinery ， in order to increase the 皿 aohines performances the radial clearance between rotor and casing beGame s 皿 aller and smaller ， As a result ， contact vibrat 量 on accidentally occurred in the rQtating machinery due to rubbing ． Espeoially in the Gase of high − speed domain ． various k量 nds of contact vibration oocurred ， such as ' " collision type synchronous vibration 「 「 ， 掣 Fsub − harmonic vibration " ， etc ． In this study ， it investigated what influence the offset of rotQr and casing position wou ！ d have en generating of sub − harmonic vibration ， analytically and experirnentally ．