| The performance of the vibration and noise of the gear transmission system is an important factor that affect the performance of mechanical equipment.Therefore,there is an important research significance and practical value to study a better methods for vibration and noise reduction in gear transmission systems.In this paper,with the support of the National Science and Technology Support Project(Project No.2013BAF01B05),the spur gear manufactured from Fe-Mn damping alloy material is taken as the research object,and the gear dynamic analysis and vibration test research are conducted.Moreover,by comparing with the common material(40Cr)gear,the vibration reduction performance of gears with high damping alloy materials is studied,which provides a better method and theoretical basis for vibration and noise reduction of gearbox.The energy dissipation mechanism of damping alloy and the basic viscoelastic constitutive model related to constitutive model of damping alloy material are introduced.The nonlinear constitutive model of damping alloy material based on viscoelastic theory is constructed.The constitutive model is extended to three-dimensional state by tensor theory,and the time increment step form of the constitutive model is deduced.The constitutive models of an isotropic linear elastic material are compiled and applied to the simulation of uniaxial tensile specimens.The feasibility and accuracy of the two development result of LS-Dyna user defined subroutine are verified.The user subroutine UMAT of the nonlinear constitutive model of the damping alloy material is programmed and applied to the uniaxial tensile test simulation.The result shows that the user program of the non-linear viscoelastic material satisfies the requirements.A three-dimensional contact nonlinear finite element analysis model of gear-bearing-housing is established.The vibration acceleration results of the typical nodes for two damping alloy material(Fe-22Mn-12Cr-4Co-0.2Nb damping alloy and Fe-22Mn-12Cr-4Co damping alloy)gearbox and the general material(40Cr)gearbox are obtained by using the user defined subroutine UMAT of the damping alloy material by LS-Dyna software.And comparing the results,the maximum effective vibration acceleration can be reduced by 38.6%.The vibration reduction of damping alloy material is verified by comparing the results.The experimental modal analysis of gear boxes equipped with gears is carried out,the correctness of the finite element model is verified by comparing with the results of finite element modal analysis.The vibration response of the gear box of the damped alloy material and the common material gear is tested under different working conditions.The results of the vibration acceleration at the measuring point of the gearbox surface and the temperature difference between the main parts of the gearbox and the room temperature are compared.The vibration and noise reduction effect of the damping alloy is further verified by the experiment method. |
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