Optimization design for seal of aviation pipeline fittings using multi-scale model

Abstract

In this paper, the aviation pipeline fittings is taken as the research object for the first time. Based on the multi-scale sealing properties analysis method, the physical planning method and Kriging agent model are used to carry out the high fidelity optimization design of pipeline fittings. Based on the rough surface of the parts, a multi-scale high fidelity sealing properties analysis method of pipeline fittings is established. The average sealing contact pressure, sealing contact area and effective sealing contact area of pipeline fittings sealing interface are taken as the sealing properties evaluation indicators, a high fidelity multi-objective optimization design model of pipeline fittings is established combining the physical programming method and Kriging agent model. The structural size and material parameters of pipeline fittings with the best sealing properties are obtained by the genetic algorithm. After optimization based on the high fidelity multi-objective optimization design model, the sealing contact area and effective sealing contact area of pipeline fittings increased by 55.97% and 65.24% respectively, and the average sealing contact pressure increased by 96.24%, which provides a scientific reference for the optimization design of pipeline fittings.