Acceleration response signals of a floating platform

The impact resistance of ship equipment is an important part of the ship's explosion and impact resistance. As an assessment tool for medium and large ship equipment, it is crucial to carry out research on the impact dynamics characteristics under the action of underwater explosive load on the offshore floating platform and establish an impact environment similar to that of real ship experiments for the impact-resistant assessment of ship equipment. This paper carries out an impact test of a floating platform under underwater explosion. The impact response signals indicate that the kinematic evolution of the dynamic system is random, disordered, and unpredictable, with spatiotemporal chaos characteristics. For the impact response system with spatiotemporal chaos characteristics, the non-stationary impact response signals are blocked, the continuous time variables are discretized, and the data orbits of the acceleration response evolving in the two-dimensional phase space are portrayed by the phase-space reconstruction method, and the mapping function of the system kinematic evolution is established, and the dynamical behaviors and nonlinear characteristics of the system are characterized by the control parameter u of the mapping function. At the same time, the spatial variables are also discretized, and nonlinear mapping is performed on each state point in each block of space. Based on the spatiotemporal dynamics equation, the spatiotemporal coupling mapping model of spatial state points is established, and the acceleration response of the floating platform's spatial measurement point is theoretically inverted, providing theoretical support for the ship's impact resistance assessment system.