Abstract:When the floating device at sea collides with other ships, it will form a complex impact environment. Given the strict mechanical analysis of the floating device at sea, if the impact load formed by the collision is not analyzed and optimized, the high analysis frequency will bring great difficulties to the subsequent work. In this paper, a Shock load reconstruction method based on a genetic algorithm-optimized Variational Modal Decomposition (VMD) and Shock Response Spectrum (SRS) is proposed. Firstly, aiming at the specific impact response signal, the genetic algorithm is used to optimize the VMD parameters, and the impact load is decomposed. Then the cut-off frequency is determined by comparing it with the original load impact spectrum. Through the calculation of structural dynamic response, the impact load reconstruction method based on genetic algorithm optimized VMD method and impact spectrum can reliably reconstruct the impact load before the structural dynamic response.