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http://dx.doi.org/10.5916/jkosme.2014.38.6.632

A study on vibration control of the engine body for a large scale diesel engine using the semi-active controlled hydraulic type of top bracing  

Lee, Moon-Seek (Wartsila Korea Ltd.)
Kim, Yang-Gon (Korea Register of Shipping)
Hwang, Sang-Jae (STX Heavy Industries Co., Ltd.)
Lee, Don-Chool (Division of Marine Engineering, Mokpo National Maritime University)
Kim, Ue-Kan (Division of Mechanical & Energy Systems Engineering, Korea Maritime University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.38, no.6, 2014 , pp. 632-638 More about this Journal
Abstract
Nowadays, as part of an effort to increase the efficiency of propulsion shafting system, the revolution of the main diesel engine in CMCR(Contract Maximum Continuous Rating) is reduced whereas the stiffness of hull structure supporting the main diesel engine is relatively flexible. However, vibration problems related with resonant response of main diesel engine are increasing although top bracing is installed between the main diesel engine and the hull structures to increase natural frequency of engine body above CMCR to avoid resonant phenomenon. In this study, the dynamic characteristic of top bracing is reviewed by analyzing measuring results of general cargo ships which apply the hydraulic type instead of the friction type to control the natural frequency and the vibration of the engine body. Moreover, considering the vibration characteristic of the engine body and the hydraulic type of the top bracing by varying the number of top bracing, authors suggest the more effective way to control the vibration of the engine body despite of lower stiffness of the hull structure than in the past when the hydraulic type of top bracing is used.
Keywords
Top-bracing; Natural frequency; Vibration control of engine body; Guide force; H-mode vibration; X-mode vibration;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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