Abstract:It is difficult to detect the simultaneous multileak of the pipeline effectively. To solve this problem, a multileak diagnosis algorithm based on the fault diagnosis observer is proposed. Firstly, the residual generator is formulated based on the fault diagnosis observer and the leak coefficients are extracted by the residual error. Secondly, the disturbance decoupling technique is used to make the observer robust to unknown disturbances. The stability of the fault diagnosis observer is proved by using the Lyapunov function and Barbalat lemma. The approach can detect and estimate the leak coefficients. Simulation results of the multileak experiment prove that the maximum error of leak coefficients is 1×10-5 m5·s-1, and the minimum error of leak coefficients is 02×10-5 m5·s-1. Field experiments evaluate the feasibility and effectiveness of the proposed algorithm. .txt