| The mechanical vibration and noise will be produced inevitably in gear reducer because of the meshing between the teeth.With the rapid development of technology,the problem of vibration has affected its further application on many occasions.For example,the vibration control of gear reducer has become urgent demand for ship industry in china.How to further control the vibration generated during operation has become one of the most important research subjects in gear reducer field,and its significance is also highlighted.Firstly,the paper will start from the practical application of the project and a power split planetary reducer as the research object,the dynamics simulation model is established in the gear professional software MASTA based on the dynamics theory of gear transmission system.The stiffness matrix and mass matrix of box structure is extracted by the Gein condensation method.The modal synthesis method is used to coupling the box structure with the transmission system model.The relationship between the transmission error of the power split planetary reducer,the number of meshing gear pairs and the change of time variable stiffness is analyzed in the case of the dynamic characteristics of box,and dynamic meshing force is computed base on transmission error.The dynamic excitation of different gear meshing is calculated and dynamic force of bearing is solved as the condition of vibration isolation design and vibration response calculation.Secondly,according to the power split planetary reducer structure characteristic,with the main excitation frequency of previous research for isolating the target,the radiation type layout to determine the application of the decoupling theory,determine the isolator supporting position and support stiffness,solving out box rigid modal frequency and vibration type.At the same time,the modal analysis of vibration isolation double-layer box is carried out by using finite element method.By comparing the two methods,modal analysis results verify the effectiveness of the radiation layout from for vibration decoupling.Thirdly,the force transfer rate,the vibration level drop and the insertion loss are used as the evaluation indexes of vibration isolation effect.The relationship between the evaluation indexes of vibration isolation is analyzed,and the influence of the stiffness change of the vibration isolation support on the vibration isolation index is studied.By analyzing the change rule of dynamic meshing force of second stage transmission system under different support stiffness and the relationship between the vibration isolation effect,the dynamic meshing force and the support stiffness is analyzed.It optimizes the stiffness isolation area of vibration isolation box,and achieves better isolation effect while ensuring the stable operation of planetary reducer.Through the comparison of gear shaft vibration displacement and axis trajectory,it verifies the stability of planetary reducer.Finally,the vibration simulation analysis of the power split planetary reducer is carried out by the finite element method of force vibration.The change of vibration response of reducer is compared and analyzed,and the effect of insertion loss is analyzed and calculated under the double deck box with and without vibration isolation.Through comparing the vibration characteristics of the double deck box with and without vibration isolation,it is verified that the design of the isolation double deck box can guarantee the stable operation of the planetary reducer,and the effect of controlling the vibration transmission of the box body is obvious,so it has good engineering application value. |
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