Study On Vibration Reduction Performance Of NGW Planetary Reducer With Fe-Mn Base Inner Gear Ring

The planetary gear transmission has a complex structure and a large number of meshing gears,which results in a large vibration impact,thus affecting the operation performance and life of machinery and equipment.The research on the vibration and noise reduction methods of planetary gear reducer has become a hot research field.Under the support of the National Science and Technology Support Project "Research on Key Technologies of Lightweight and Noise Reduction for Large Mines and Lifting Transmission Devices(No.2013BAF01B05)",NGW 11 planetary reducer is considering as the research object,the vibration characteristics of planetary reducer made of Fe-Mn damping alloy and 40 Cr internal gear material are studied,which provides a new research path for vibration and noise reduction of planetary reducer.The basic concepts of internal friction and damping are introduced.The four indexes for evaluating the damping properties of damping alloys are proposed.Deducing four basic linear viscoelastic constitutive models and the load-unload constitutive equation of damping alloy material,which is deduced the three-dimensional state by tensor theory,then the time increment step is written to lay the foundation for compiling the material subroutine.The self-defined material subroutine for damping alloys is compiled by Fortran language and embedded in LS-DYNA dynamic analysis software.The correctness of LS-DYNA numerical simulation is verified by using isotropic linear elastic materials.A new LS-DYNA.exe solver is been complied by the UMAT,and the numerical simulation analysis of Fe-Mn damping alloy material is carried out.Comparing the stress-strain curves of points with those obtained from experiments,it is verified that the constitutive equation can correctly describe the mechanical properties of damping alloy materials and the correctness of the self-defined material subroutine.The transient dynamic analysis of the planetary reducer with Fe-Mn damping alloy is carried out and the stress distribution rules of the box and gear system are obtained.The vibration acceleration of the typical measured points on the surface of the box are chosen,and their time-domain and frequency-domain curves of each measuring point are acquired.The effective value of vibration acceleration of eight measuring points on the box are calculated.The validity of correctness of the finite element modeling method of planetary reducer is verified by comparing the results of theoretical modal analysis with experimental modal analysis.The vibration acceleration experiment of 40 Cr material reducer is completed on the mechanical vibration test bench,obtaining the time domain curves of vibration acceleration of each measuring point and the vibration characteristics of gear box.Comparing the effective acceleration value obtained from the experiment with the simulation results,they show the error within the allowable maximum range of engineering,which validates the accuracy of transient dynamic analysis of gearbox correctness.By comparing the transient dynamic simulation results of two kinds internal gear materials under different working conditions,the results are shown that the vibration of the different measuring points on the box,which annual gear made of Fe-Mn damping alloy material decreases to a certain extent compared with annular gear made of 40 Cr material under two working conditions,and the maximum effective value of acceleration decreases by 19.04%.