Research on the dynamic response strength of multi wind turbines integrated foundation

Abstract

The study of strength analysis methods for offshore floating structures is extremely important. The paper focuses on the integrated foundation of offshore Multi Wind-turbines integrated Foundation (MWF) and focuses on the strength analysis method of floating structures considering motion response. Compared with traditional quasi-static analysis methods, we further consider the impact of the ultimate motion state of the floating structure on the stress results. Firstly, the maximum environmental load and ultimate motion attitude of MWF were established as boundary conditions based on hydrodynamic analysis methods, which solved the problem of inaccurate constraint loads on floating bodies in traditional analysis. Then, we established a stress solving equation based on motion state and inertia release, which solved the problem of equivalent accuracy of floating body motion state. Finally, through theoretical analysis, numerical simulation, and experimental testing, it was found that the stress solution method considering the motion state of the floating body in this paper is more accurate and reliable, with an error of less than 10% compared to the stress results of experimental testing. The calculation accuracy has been improved by 30%. These studies have improved the stress solving methods of floating structures in actual marine environments, providing new ideas and theoretical references for the strength and safety analysis of offshore floating equipment. Highlights (1) The stress strength analysis method of offshore floating structures is proposed based on dynamic environmental loads and Extreme sport state. (2) The extreme values of the maximum longitudinal displacement, maximum longitudinal inclination angle, and maximum longitudinal velocity of the MWF model were obtained under the maximum environmental load. (3) Investigates the method for determining the motion state of floating structures and the influence of corresponding stress. (4) The error between the stress solution method based on the motion state of the floating body and the experimental test results is less than 10%, which improves the accuracy by 30% compared to traditional analysis methods.