Jixie chuandong (Jul 2022)
Optimization Design of Diaphragm Profile based on Kriging Model
Abstract
The failures of diaphragm couplings in application are mostly originated from fatigue failures of the diaphragm. To improve the fatigue performance of the diaphragm coupling，a optimization design method for the diaphragm profile parameters based on the Kriging model is proposed to maximize the high-cycle fatigue safety factor of the diaphragm design. After analyzing the structure of the diaphragm profile and the feature of the high-cycle fatigue stress for the diaphragm under various loads，the sample data of the high-cycle fatigue safety factors for groups of diaphragm profile parameters （including outside/inside radius ratio，profile index and minimum thickness） are obtained，and an initial Kriging model is then constructed on the basis of these sample data. Finally，the initial Kriging model is updated with MP （minimizing the predicted objective function） infill-sampling criterion and genetic algorithm，and the optimal design is obtained via the final Kriging model. The proposed method is then utilized to optimize the profile design of a diaphragm in a helicopter transmission system，and the results show that the static stress and dynamic stress of the critical point for the optimized diaphragm are decreased by 18.7% and 40.7% respectively compared with the original diaphragm design，and thus the high-cycle fatigue safety factor of the optimized diaphragm is increased by 52.8%. The proposed method can be used to improve the fatigue performance of the diaphragm，which provides a reference for the design of the diaphragm profile.
