Research on modeling and dynamic characteristics of GTF transmission gearbox

Taking a GTF star transmission gearbox as the research object, this paper innovatively introduces the Westgard decision diagram, which is widely used in medical clinical trials, and combines "relative error distance method of speed, transmission ratio and meshing force" to build a performance evaluation method of gearbox model based on multi-body dynamics. At the same time, the translation-torsional dynamics model of the gearbox is established by using the lumped mass theoretical method, and the key parameters such as output speed, gear meshing force and bearing vibration acceleration are obtained by the analysis of the two models. Comparing the simulation results of the multi-body dynamics model selected by the performance evaluation method with the analysis results of the concentrated parameter method, it can be seen that the performance of the multi-body dynamics model selected by the performance evaluation method is reliable and effective, and the analysis accuracy and analysis efficiency can be taken into account. The maximum absolute error of meshing force is 2.5771 N, and the absolute error of vibration acceleration at the bearing of input shaft and output shaft is controlled within 0.08 m·s -2 and 0.1 m·s -2 , respectively. The model performance evaluation method proposed in this paper effectively solves the problem of the balance between simulation efficiency and accuracy of the traditional gearbox dynamics model, provides a new technical path for the performance evaluation of complex gear transmission systems, and provides a reliable theoretical basis and technical support for the design and optimization of gear transmission systems of high-end equipment such as aeroengines, and has important engineering application value.