| The herringbone planetary transmission system combines the characteristics of the herringbone gear transmission and planetary gear transmission system,which has a series of advantages such as large single gear ratio,steady transmission,high efficiency and strong carrying capacity.At the same time,the structure of the planetary transmission system is more complex,its manufacturing and installation process will inevitably introduce a undesirable error,so that the system has increased vibration,excessive operating noise and decreased life expectancy and other adverse phenomena.Therefore,it is necessary to carry out experimental research and simulation about vibration,the resulets of the research will provide some guidance for the design process of the system.Based on the translation-torsion coupling dynamics model of the herringbone planetary gear system,the design method of the natural characteristics of the system is designed,the arrangement of the sensor is determined,and the vibration data processing formula is deduced.According to the existing analysis about load sharing of the planetary gear transmission,the method of the load characteristics of the planetary transmission system based on the tooth root stress of the ring gear is designed,and the arrangement of the strain gauge and the bridge building method are analyzed.According to the working condition of the main reducer of a helicopter,the basic parameters of the planetary transmission system are designed.Based on the similarity theory,the similarity model of the gear system which is easy to be processed and tested is designed.Considering the form of sensor installation and data transmission method,the test gearbox and test bench structure are designed to test the natural characteristics of the planetary transmission system and the load sharing.Completed the drive,load equipment and various sensors selection.An translation-torsion coupling dynamics model of the herringbone planetary gear system was established in ADAMS.With this model,both natural frequency of the system and transfer function of the components were analized.At the same time,natural frequencies in different stiffness parameters range are analylized.In the solidworks,the 3D model of the transmission system is established,then the model is imported into the ADMAS to add the quality attributes and constraints.Verifies the correctness of the model by kinematics analysis of the system that considering the elastic support of the bearing.The meshing force of each meshing pair is extracted and the load sharing characteristics of the system are analyzed.The construction of the dynamic characteristic test platform of the single-statge planetary transmission system is completed,and the key components of the platform are introduced.The installation and wiring method of accelerometers in vibration test are introduced in detail,and some components of the system are analyzed by vibration experiment.This paper also introduces the method of strain gauge arrangement in load-sharing characteristic test.The characteristic of load sharing is analyzed in experimental way by caculating load-sharing coefficient. |
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