Pipeline leakage analysis and vibration study of a refrigeration system

Aiming at the vibration leakage phenomenon of refrigeration system pipeline of a civil space equipment, the main leakage location was tested and analyzed. To obtain the cause of leakage, the finite element model of the fusion pipeline installation state was constructed, and modal vibration simulation analysis of the pipeline structure was carried out. Using three axial random response and harmonic response to simulate the actual vibration condition of the product. Under the actual vibration condition, the main stress concentration point of the designed structure is the joint of square tube and circular tube, and the maximum equivalent stress cloud and displacement cloud diagram of X-direction, Y-direction and Z-direction of the vibration of pipeline was obtained under vibration excitation. The main stress concentration point of the structure was the joint of square and circular tube, and the maximum three-direction stresses of the pipeline are 8.15 MPa, 9.19 MPa and 7.05 MPa, which are much lower than the yield strength (165 MPa) and tensile strength (235 MPa) of 6063 aluminum alloy material. The simulation results verify the rationality of the design and provide an effective method for pipeline optimization design in complex environment. © 2020, Politechnica University of Bucharest. All rights reserved.