Objective This study analyzes the shock environment characteristics of a large-scale floating shock platform (LFSP) under the action of an underwater blast load.

Method The acoustic solidification method is used as the basis for the numerical simulation of an LFSP underwater blast. The validity of the calculation method is verified by comparing the experimental and simulation data, and the shock environment of the LFSP is studied in terms of its longitudinal profile distribution and the effects of changes in the lateral distance of the blast source on the shock environment.

Results The shock environment distribution patterns along the longitudinal surface in the bottom of the front blast surface, back blast surface and middle longitudinal section are basically the same. The shock environments on the front and back sides are small, while that of the middle is large. The shock environments of the back and forth sides of the floating platform differ, and the velocity value of the spectrum of the back side of the explosion is greater than that of the front side, mainly because the back blast surface measurement points within the bottom of the local mode are excited so spikes appear in the shock spectral lines. The displacement value of the spectrum of the front side is greater than that of the back side, mainly because the burst distance is smaller so the shock response is stronger. The influence of explosion source distances on the overall shock environment of the inner bottom are analyzed, and the floating platform shock environment prediction formula is obtained.

Conclusion The results of this study can provide useful references for floating platform assessment tests.