The Offshore Platform Impact And Pipeline Leak Location Method Using Optical Fiber Grating Sensing Network

With the accelerated process of social industrialization, the demand for oil and gas resources has increased. As an important mining and transportation equipment of oil and gas resources, the safety of offshore platform and oil pipeline has been widely concerned by researchers. The precise localization of offshore platform impact and oil pipeline leak is an important means to avoid the major oil and gas accidents. Fiber Bragg grating(FBG) sensor has the advantages of low cost, high precision, corrosion resistance, high temperature resistance and so on, so it has become a research focus in the field of sensing. The application of FBG in safety monitoring of oil and gas equipment, has the incomparable advantages than traditional electrical sensors. And the peak detection of FBG reflection spectrum is a key factor that affected the accuracy of sensor system. Therefore, in view of the problem of offshore platform impact and oil pipeline leakage, the design of a high precision localization system based on FBG sensor network has a certain significance and application value.In view of the problem that the existing impact location methods are vulnerable to ambient temperature, the FBG sensing network with measurement array and reference array is designed to improve the stability of the sensor system. In view of the problem that the impact load is hard to be determined, an impact force identification method based on support vector machine is proposed. In order to improve the localization accuracy of the existing methods, combined with the theory of cosine similarity and inverse distance weighted difference algorithm, a high precision impact point localization algorithm is proposed. The platform impact test system was built, and the feasibility of the proposed method was verified by experiments.In view of the problem that the existing oil pipeline leak location method is easy to be disturbed by ambient temperature, a sensor probe with temperature self compensation function is designed. Aiming at the problem of position sensing probe is limited, the design scheme of the leakage induction layer and the stress conduction is proposed. In view of the problem that the leakage point location accuracy is low, combined with the spacing between the sensing probe, we propose the leak location algorithm, which realizes the precise location of pipeline leak.In view of the problem that the existing FBG reflection spectrum peak detection algorithm can not meet the multi-peak spectral adaptive peak searching, the adaptive peak region segmentation algorithm is designed by combining the Hilbert transform and one dimensional Gabor filtering method. In view of the problem of limited peak searching accuracy, we proposed a self-adaptive multi-peak detection(SMD) algorithm based on the non symmetric generalized Gauss model theory. The feasibility and effectiveness of the proposed scheme are verified by simulation experiments.