Mesh Stiffness And Dynamic Characterastic Analysis Of Modification Herringbone Gears With Wear And Crack

The herringbone gear system has high cantact radio,small axial force,strong bearing capacity,and stable transmission,and it is an important transmission device in the field of marine ships,high-speed rail transit,and high-speed aerospace.The timevarying meshing stiffness of the herringbone gear is one of the main internal excitations of the gear pair,and is the main source of vibration and noise of the herringbone gear system.Tip modification,wear and cracks will affect the time-varying meshing stiffness and the dynamic performance of herringbone gears.Therefore,the research on the time-varying meshing stiffness of the herringbone gear is the basis of analyzing the dynamic characteristics of the herringbone gear,and it is of great significance f or identifying the failure of the gear system.In this paper,the meshing stiffness with the modifiction,wear and tooth crack is calculated by using the potential energy method,and combined with the herringbone gear dynamic analysis model,the influence of modification,wear and tooth crack on the herringbone gear system is analyzed.(1)Mesh stiffness and dynamic models of the standard herringbone gear are built.The potential energy method is used to calculate the time-varying meshing stiffness of the standard helical gears,and the calculation results are compared with the finite element method to verify the correctness of the potential energy method.Based on the elastic dynamics of the gear,a dynamic analysis model of the herringbone gear-rotor-bearing is established,and combined with the meshing stiffness of the standard helical gear to analyze the dynamic response of the herringbone gear dynamic system.(2)Mesh stiffness and dynamic models of the modification herringbone gear are built.Based on the potential energy method,the slice method and the deformation compatibility principle,the calculation results of the potential energy method are verified by the finite element method.Combining the herringbone gear-rotor-bearing dynamic analysis model and the meshing stiffness of helical gear with tip relief,the influence of the modification parameters on the time-varying meshing stiffness of the helical gear and the dynamic response of the herringbone gear system is analyzed.(3)Mesh stiffness and dynamic models of the modification herringbone gear with wear are built.The influence of modification on the wear depth is anlysised and the wear depth of the helical gear is calculated.The surface wear is regarded as the tooth profile error,and the meshing stiffness of the helical gear with wear and tip relief is calculated by using the potential energy method,the slice method and combined with the potential energy method,the slice method and the deformation compatibility principle.The dynamic analysis model of the herringbone gear-rotor-bearing system is combined with the meshing stiffness of the helical gear with wear and tip relief,and the influence of the surface wear on the the dynamic response of the herringbone gear system is analyzed.(4)Mesh stiffness and dynamic models of the modification herringbone gear with wear and crack are built.The effect of the tooth crack on the mesh stiffness of helical gear is analysed by calculating the mesh stiffness of helical gear with crack,wear and modification.The dynamic analysis model of the herringbone gear-rotorbearing system is combined with the meshing stiffness of the helical gear with crack,wear and tip relief,and the influence of the tooth crack on the the dynamic response of the herringbone gear system is analyzed.