Multibody Dynamic Analysis Of 6S50MC-C Marine Diesel Engine Propulsion Shafting

Marine diesel propulsion shafting is an important part of marine power plant,and the operating excitation of propulsion shafting is one of the important internal excitation forms of diesel engine vibration.Its operating condition has an important effect on the safety of diesel engine.Multi-body system dynamics is an effective method of engine simulation and analysis,through the study of propulsion shafting multi-body dynamics.The dynamic and vibration characteristics of the propulsion shafting can be predicted,which provides a certain technical reference for the safe operation of the diesel propulsion shafting and the performance of the whole engine.This paper takes 6S50MC-C marine diesel engine as the research object and establishes the 3D solid model of the diesel engine by SOLIDWORKS software.Then the multi-rigid body dynamics model is obtained by importing ADAMS.By using ANSYS and ADAMS joint simulation method,the propulsion shafting is subjected to the flexible treatment,and the rigid and flexible multi-body dynamics model close to the project is established,and the multi-body dynamics simulation under the rated working condition is carried out based on the model.In addition,there are some common faults in the bearing of the propulsion shafting,which are worn by the main bearing and tail bearing,middle bearing descent and other fault conditions,then the load characteristic and the torsional vibration characteristics of the propulsion shafting are studied for the fault condition of marine diesel engine,and the influence of the fault on the whole propulsion shafting is analyzed.The research on 6S50MC-C marine diesel engine shows that the changes of the supporting positions of propulsion axles have different degrees of influence on the load characteristics and torsional vibration characteristics of the entire shaft system.