| As the main development direction of the next generation aeroengine,the Geared Turbo Fan engine（GTF）uses a star type transmission gearbox,which makes it possible to apply many previously unavailable technologies.Herringbone tooth star gear transmission has many advantages such as high transmission ratio,stable transmission,etc.,but the working conditions of star gear transmission gearbox are poor,which not only has high power density and poor heat dissipation conditions,but also is subject to the additional effects caused by the basic movement of the system,so the excitation is rich and the dynamic characteristics are complex.Therefore,it is particularly important to analyze the dynamic characteristics of the star transmission gearbox to improve the reliability of the transmission system and the overall stability of the engine.In this paper,a GTF aeroengine star transmission gearbox is taken as the research object.Based on multi-body dynamics and concentrated mass method,modeling,dynamic characteristics analysis and other research are carried out,forming an effective method to analyze the vibration response of GTF gearbox system,which is also applicable to similar problems,so it has engineering practical value and guiding significance.The main research contents are as follows:（1）Based on the multi-body dynamics theory and the concentrated mass method,the multi-body dynamics model and the concentrated mass theory dynamics model of the star transmission gearbox are established respectively.Under the same working conditions,the input and output speed and gear teeth meshing force response results of the two models are compared and verified to ensure the correctness of the modeling.（2）The components in the star transmission gearbox are treated flexibly,and the modal analysis of each component and assembly is carried out based on ADAMS and ANSYS.ADAMS,ANSYS and modal test data are compared and analyzed to verify the correctness of the model.（3）On the premise of ensuring the correctness of modeling,a variety of rigid flexible coupling virtual prototypes are built based on the theory of multi-body dynamics,Westgard evaluation chart commonly used in medical inspection is introduced,and the virtual prototypes are screened according to the"relative error distance method of speed,transmission ratio and meshing force"[1]to ensure that the model gives consideration to simulation efficiency and accuracy.（4）The vibration sensitive parameters of the star transmission gearbox are extracted using the selected virtual prototype model.Based on the extracted vibration sensitive parameters,the vibration responses of the multi-body dynamic model and the concentrated mass model at the bearing under the conditions of health and considering the installation error and bearing eccentricity error are compared and analyzed. |
PDF Full Text Request