Wave slamming load inversion investigation of air cushion vehicle skirt airbags based on impulse-space superposition method

Abstract

The flexible skirt airbag is the core component of air cushion vehicle, and the external load it bears under wave slamming directly affects the safety and stability of the structure. Due to the non-uniformity of wave slamming load in time and space, accurately inverting the dynamic load has become an important challenge in current research. This paper proposes a multi-region load inversion model based on impulse-space superposition method to address the inversion of spatial non-uniformly wave slamming load. The construction of the load-response relationship and the solution process of dynamic load inversion are explained. The response characteristics under unit load in a single sub-region are analyzed, and a preferred arrangement of monitoring points along the Y-direction is determined for subsequent inversion. The effects of wave slamming load duration, wave slamming load distribution and wave slamming load area on the inversion precision are discussed. As the load distribution becomes more complex and the areas are larger, the inversion error increases. Properly increasing the number of monitoring points can significantly improve inversion accuracy, especially in more complex asymmetric load scenarios. This inversion method is easy to implement and can provide valuable insights for subsequent research on load identification of air cushion vehicle flexible airbags in actual marine environments.