Experimental Study On Quality Of Marine Shafting Alignment

Over recent years, with the ship's large and high-speed development, the problems between rigid shaft and increasing flexibility of the hull increase, the shaft alignment has become more complex. On the shaft alignment of theoretical and practical measurement, studies are particularly important, so, it is necessary to combine theoretical analysis and practical measurements carried out up to the shaft alignment system.Based on references of a large number of papers and learning of regular shafting alignment methods, full use of existing matured computing software and advanced measurement techniques,the experimental study on shafting alignment is conducted in depth research.Based on the shaft testing platform built by laboratory, paper has the research carried out as follows:First of all, by the finite element analysis, using finite element analysis ANSYS software to calculate the shaft in a straight line school, gets the loads on bearings under line state and also some of the mechanical parameters of distribution and value in various shaft segments, has a clear understanding of the situation in line shafting alignment.Secondly, in the theoretical calculation based on the dynamic parameters of the shaft for the actual measurements, through application of strain test technology and wireless sensor acquisition system, the shaft torque and bending moments are measured. Based on torque measurement, the shaft power is tested. Through the actual measurement of the shaft power, finding out that the stability of the shaft during operation, the shaft torque in all operating conditions do not change and the basic power of the increase are used to increase speed of shaft.Finally, under the straight shafting alignment state, the practical loads on the bearings when the bearings are replaced by Jack (including intermediate and stern tail bearings) are measured with jack and load sensor using improved jack-up method. Comparison with theoretical results, which are calculated in the software when the jack is regarded as a real support in the shafting alignment. So the result can evaluate the quality on the shafting alignment.