Abstract
Twin bank engine, the ordinary type two slow speed diesel engines are combined with back to back each other and mounted on common bedplate, is the new type engine which has been developed to achieve low fuel oil consumption.
The special features of its structures are as follows.
(1) It has two main bearings on each vertical wall of the common bedplate.
(2) It has a longitudinal girder in the center of the engine, which separates the bedplate into two independent crank cases.
(3) Top bracings of friction type are provided at the upper section of frame boxes and connect the two banks at each corresponding pair of cylinders.
In order to clarify the behavior of the twin bank engine which has above special features and to confirm the structural superiority of the twin bank engine, stresses and deformations analyses of the common bedplate and the frame boxes by the F.E.M and by the plastic model test have been carried out.
Analysed results indicate the desirable rigidity of the common bedplate, and have a good agreement with the actual measured values at engine running.
So we conclude that estimation method of the stresses and deformations of the bedplate and the frame boxes of the twin bank engine is established here, and that the rigidity of bedplate of the twin bank engine is same as or higher than that of the ordinary type engine.
