| The matching design and connection reliability of marine diesel engine crankshaft vibration damper plays an important role in reducing the torsional vibration of crankshaft,enhancing the working life and controlling the vibration and noise of diesel engine.The interference fit is widely used in the connection of the diesel engine crankshaft and vibration damper due to the advantage of simple structure,big transmission torque,good neutral,strong bearing alternating load ability and so on.With the interference fit connection of a Marine diesel engine crankshaft and vibration damper as the research object,the interference fit connection mechanism and installation process were researched thoroughly by using the methods of theoretical derivation,finite element analysis and experimental verification,effectively solve the interference fit contact surface scratch problem in the process of installation and have great significance for improving the working performance and service life of diesel engine crankshaft vibration damper.Main research works of this paper are as follows:(1)Combined with the theory of elastic-plastic mechanics and the thick-walled cylinder theory,the mechanical properties of crankshaft vibration damper interference fit connection is analyzed deeply,the calculation formula of crankshaft vibration damper interference fit contact stress and deformation is deduced.According to the theory of contact finite element analysis,the crankshaft vibration damper interference fit connection finite element model is established by the finite element software ANSYS,the stress and strain distribution rule of crankshaft vibration damper interference connection state and the process of assembly is analyzed,and the theoretical support is provided for the optimization design of the crankshaft vibration damper interference fit connection structure.(2)According to the basic theory of the cone interference fitted hydraulic installation process,numerical analysis method is used to study the oil pressure distribution in the crankshaft and vibration damper main hub interference fit contact surface hydraulic oil tank,and to calculate the deformation rule of the crankshaft and vibration damper main hub,in the process of hydraulic installation,the crankshaft and the main hub interference fit contact surface scratch mechanism is clarified in the process of hydraulic installation.(3)The influence of hydraulic oil tank structure and hydraulic installation process parameters to the hydraulic installation quality of the crankshaft vibration damper interference fit connection is analyzed,the optimization design of interference fit contact surface hydraulic oil tank structure and hydraulic installation process is made by the method of theoretical calculation and numerical analysis,the crankshaft and the main hub interference fit contact surface scratch problem is solved effectively in the process of hydraulic installation.(4)The electric resistance strain test technology is adopted to complete the stress and strain test of crankshaft and the vibration damper main hub in the process of the crankshaft vibration damper interference fit connection assembly,interference fit connection state and interference fit connection disassembly.Through the comparative analysis of experimental measurement results and the simulation results,the experimental data and simulation results of each measuring point are basic coincidence,the reliability of the finite element analysis results is verified effectively. |
