Hydraulic transmission system is widely used in aircraft controls.During the operation of the control sur-face,pressure fluctuations in the hydraulic system can cause certain impacts on the hydraulic pipelines.The hy-draulic pipelines may deform and vibrate due to these impacts,affecting the flow of liquid in the pipelines which fluid solid coupling phenomena comes into being.This article introduces CFD/CSD numerical calculations on the fluid solid coupling phenomena of a hydraulic pipe so as to obtain the flow characteristics inside the hydraulic pipe and the structural dynamic response of the pipe wall,providing numerical reference for the design of hydraulic pipelines.
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