Study On Effects Of Stern Bearing On Shafting Conditon

The working condition of the ship shaft system plays an important role in the normal operation of the propulsion device and the whole ship,especially the section of stern shaft in the stern shaft tube,which is directly connected with the propeller,the working condition is fickle and the influencing factors are complicated.Therefore,it is necessary to study it deeply.In the practical ship,most of the stern shaft is placed in the stern shaft tube,it is difficult to study it in detail and overall.Therefore,taking into account the practical stern shaft installation and convenience of experimental study,this paper introduces the design of the ship’s stern shaft test bed firstly,then complete the construction of stern shaft experiment platform.In this paper,the finite element method and the transfer matrix method are used to calculate the parameters of the stern modeling in the straight shafting alignment and reasonable shafting alignment.We can get the parameter of stern shafting condition.The signal collected by strain gage and quartz pressure sensor,we can get the strain value and dynamic bearing load of straight shafting alignment and rational shafting alignment.Designing and writing program of actual measurement,based on transfer matrix,and the static strain measurement result is brought into the measured calculation program,and the parameters,based on the measured stern shafting,are obtained.After the analysis of the parameter of the shafting system in stern shafting,we can find that the after stern bearing load value,after rational alignment,it is lower than the condition of straight alignment,all of the bearing load are balanced.When speed arrive at a point,the moment value of rational alignment state on some sections are larger then moment value in the condition of straight alignment.