Abstract: Aiming at the problem of difficult monitoring, identification and analysis of the subsea choke valve erosion failure, the early erosion failure characteristics of the subsea choke valve based on numerical simulation were analyzed and studied. Firstly, based on the finite element theory, the simulation model of the erosion degradation of the subsea choke was established in the ABAQUS simulation environment, combined with the Tabak off-Grant erosion degradation analysis model, the coupled LagrangeEuler algorithm and the UMESH-MOTION user interface program; Secondly, geometric reconstruction at the spool using the ALE adaptive mesh technique and nodal displacement technology was studied to solve the problem of change in spool geometry due to erosion; Finally, based on the simulation of the entire erosion degradation process of the spool, the model was used to extract and explore the characteristic quantities that can effectively characterize the erosion failure through time domain analysis and frequency domain analysis. The results show that the power spectral density values of the vibration data and flow velocity data at the subsea choke outlet can be used as a characteristic quantity for the occurrence of faults,and can identify early faults with a degree of erosion damage of around 10%.

Key words:  choke valve; early erosion fault;fault diagnosis; numerical simulation

FANG Xin, WANG Hong-hui, TIAN Xiao-jie, et al. Analysis of early erosion fault characteristics of subsea choke valve based on numerical simulation［J］.Journal of Mechanical & Electrical Engineering, 2021,38(11):1417-1423.