Compared with the ground method, the offshore platform (OP) has the characteristics of complex structure and large volume. It has been used in harsh marine environments for a long time and is often affected by wind, wave, tide and ice loads; at the same time, adverse factors such as ship strikes, hurricanes, fires and explosions make the system vulnerable to damage. The destruction of the marine environment will not only cause serious safety accidents and economic losses, but also cause serious pollution to the marine environment, which makes people pay more attention to the safety of large-scale projects. The main purpose of this paper is to study the identification technology of modal parameter (MPs) of OPs based on PCA. Aiming at the shortcomings of the existing linear PCA technology to remove the influence of environmental factors, this paper adopts the nonlinear PCA (kernel PCA) technology to remove the influence of environmental factors. Experiments show that, except for working condition C1, the damage indexes of all other working conditions (C2~C6) exceed the control limit, and the identification is correct, but for working condition C2, it can be seen from the figure that most of the samples have damage index critical control limit edges. , it will also cause some disturbance to the recognition results. The results of the test model show that the PCA technique can effectively remove the influence of environmental factors on the damage identification of OP structures.

Sahilli Kavitar. Identification Technology of Offshore Platform Modal Parameters Based on Principal Component Analysis. Frontiers in Ocean Engineering (2021), Vol. 2, Issue 1: 35-44. https://doi.org/10.38007/FOE.2021.020105.

[1] Wolf J , Salvato M , Coffey D , et al. Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS. Monthly Notices of the Royal Astronomical Society, 2020, 492(3):3580-3601. https://doi.org/10.1093/mnras/staa018

[2] Moideen R , Behera M R , Kamath A , et al. Numerical Simulation and Analysis of Phase-Focused Breaking and Non-Breaking Wave Impact on a Fixed OP Deck. Journal of Offshore Mechanics and Arctic Engineering, 2020, 142(5):1-22. https://doi.org/10.1115/1.4046285

[3] Raheem S , Aal E , Abdelshafy A , et al. Structural performance assessment of fixed OP based on in-place analysis. Coupled Systems Mechanics an International Journal, 2020, 9(5):433-454.

[4] Tronci E M , MD Angelis, Betti R , et al. Semi-Automated Operational Modal Analysis Methodology to Optimize MP Estimation. Journal of Optimization Theory and Applications, 2020, 187(3):842-854. https://doi.org/10.1007/s10957-020-01694-x

[5] Weeks K , Safa M , Kenyon G , et al. Offshore multi-purpose platform efficacy by U.S. coastal areas. Renewable energy, 2020, 152(Jun.):1451-1464. https://doi.org/10.1016/j.renene.2020.02.079

[6] Omidalizarandi M , Herrmann R , Kargoll B , et al. A validated robust and automatic procedure for vibration analysis of bridge structures using MEMS accelerometers. Journal of Applied Geodesy, 2020, 14(3):327-354. https://doi.org/10.1515/jag-2020-0010

[7] Raheem S , Aal E , Abdelshafy A , et al. Structural performance assessment of fixed OP based on in-place analysis. Coupled Systems Mechanics an International Journal, 2020, 9(5):433-454.

[8] Moideen R , Behera M R , Kamath A , et al. Numerical Simulation and Analysis of Phase-Focused Breaking and Non-Breaking Wave Impact on a Fixed OP Deck. Journal of Offshore Mechanics and Arctic Engineering, 2020, 142(5):1-22. https://doi.org/10.1115/1.4046285

[9] Sapry H . Exploring Logistic Setup Challenges during a Scheduled OP Shutdown. International Journal of Advanced Trends in Computer Science and Engineering, 2020, 9(1.1 S I):149-154. https://doi.org/10.30534/ijatcse/2020/2791.12020

[10] Parveen N , Alim M A . Natural convection of fluid with variable viscosity and viscous dissipation from a heated vertical wavy surface in presence of magnetic field. Journal of Naval Architecture and Marine Engineering, 2020, 17(2):101-113. https://doi.org/10.3329/jname.v17i2.45674

[11] Reddy S , Reddy P . Biomathematical analysis for the carbon nanotubes effects in the stagnation point flow towards a nonlinear stretching sheet with homogeneous-heterogeneous reaction. Journal of Naval Architecture and Marine Engineering, 2020, 17(1):67-77. https://doi.org/10.3329/jname.v17i1.33734

[12] Saravana R , Sreenadh S , Kumar P R , et al. Peristaltic pumping of Ellis fluid through a flexible tube with complete slip effects. Journal of Naval Architecture and Marine Engineering, 2020, 17(2):79-88. https://doi.org/10.3329/jname.v17i2.49559

[13] Kaewkhiaw P . CFD analysis of unsteady propeller performance operating at different inclined shaft angles for long-tail boat in Thailand. Journal of Naval Architecture and Marine Engineering, 2020, 17(2):115-127. https://doi.org/10.3329/jname.v17i2.42622

[14] Sengupta S , Deb R . Gravitation modulation impact on MHD free convection flow of micropolar fluid. Journal of Naval Architecture and Marine Engineering, 2020, 17(2):199-218. https://doi.org/10.3329/jname.v17i2.41742

[15] Shah B C , Gupta S K . Long-Distance Path Planning for Unmanned Surface Vehicles in Complex Marine Environment. IEEE Journal of Oceanic Engineering, 2020, 45(3):813-830. https://doi.org/10.1109/JOE.2019.2909508

[16] Panagant N , Yldz M , Pholdee N , et al. A novel hybrid marine predators-Nelder-Mead optimization algorithm for the optimal design of engineering problems. Materials Testing, 2020, 63(5):453-457. https://doi.org/10.1515/mt-2020-0077

[17] Feder J . Operation Planning Tool Improves Quality, Efficiency of Offshore Risk Management. Journal of Petroleum Technology, 2020, 72(8):69-70. https://doi.org/10.2118/0820-0069-JPT

[18] Maksymenko A V . The International Anti-Offshore Regulation in the Context of Global Financial Imbalances. Business Inform, 2020, 12(515):60-65. https://doi.org/10.32983/2222-4459-2020-12-60-65