Two-dimensional stress analysis of the aircraft hydraulic system pipeline

Abstract

Pipeline vibration in aircraft hydraulic systems has drawn more attention in recent years. There are still a lot of problems unresolved in the field, due to the complex non-linearity of fluid–structure interaction. Two-dimensional stress analysis of pipeline in an aircraft hydraulic system has been carried out in this study. As the classical theory on the fluid-filled pipe is based on one-dimensional model, a two-dimensional model has been developed to study the stress distribution around the section vertical to the pipe axis, which affects the fatigue life of the pipeline. Influences of curvature and stress concentration have been included in the model. Three-dimensional finite element method model for a pipe section between the pump and the first pressure filter in backup system of the aircraft hydraulic system has been constructed to improve the one-dimensional theoretical model. Simulation and experimental results can match each other well in stress analysis. Some discussion about the parameters in the developed theory model is given.