Structural vibration challenges of marine diesel and gas engines
Controlling structural vibration of marine engines continues to be a challenge as specific power increases and versatility is a demand. Modern diesel and gas engines should be capable of running both as propulsion engines with variable speed and generator set engines with fixed speed. For both applications, load response is of paramount importance. The same engine platform is normally used for applications using diesel-, gas-, propulsion- and genset-engines in several cylindernumbers. Finding a design solution for the rotating shaft system and the structural block system which works well for all combinations is a task which need consideration of many influencing factors. As vibration level is influencing engine reliability and life, it is important to chose a design solution with low vibration levels. However for obvious production and service reasons, the number of shaft and block variants should be kept to a minimum, often requiring that the same solution should be capable of sustaining all engine applications. The paper discusses how modern Multi Body Simulation tools may be used to evaluate different solutions for both shaft system and structural system, and take into consideration the influence of the participating systems. In particular it is discussed how various firing orders will give different possibilities for torsional tuning of the shaft system. For marine variable speed applications it is important that the engine can be tuned to run comfortably over the whole speed range both with regard to shaft torsional vibrations and engine structural vibrations. It is shown that different firing orders cause large influences to the Xand H-moment of the engine block structure. Measures to avoid resonance at critical eigenfrequencies are also discussed.
Havard Solbakken Trond Inge Eide Rune Nordrik
Bergen Engines AS,Norway
国际会议
上海
英文
1-9
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）