低速ディーゼル発電機関へのダイナミックダンパの適用

抄録

Recently, the slow speed 2-stroke diesel engine generator plant has become more attractive in the field of stationary application because it offers the advantages of low fuel consumption and low cost maintenance. These slow speed 2-stroke diesel engines which range from several thousand kW up to 50 MW are normally used at 100 to 200 rpm. These stationary units are operated at a constant speed, therefore it is impossible to avoid the speed range where annoying vibrations occur under operation, in the same manner as in marine use. Recently, environmental issues including vibration problems are considered more seriously by the customer. It is required that the effects of vibrations on the adjacent plant units in addition to the engine itself should be minimized. In order to comply with these customers' requirements, the change of firing order, the introduction of various kinds of balancers and dampers, etc. have been totally investigated at the design stage.
In the case of one of the stationary plants, a dynamic damper has been introduced successfully in order to reduce engine frame vibration. In this paper, the effectiveness of such dynamic dampers, which are arranged on both ends of the engine cylinder frame, is discussed.
These kinds of dynamic dampers have been widely used in engine shafting as well as in electric motors and recently they have been used for main towers and tall building as vibration reducing devices. The application of dynamic dampers can also be used effectively for reducing vibration levels on the hull superstructure.