Displacement Field Identification of Ship-Borne Helicopter Landing Deck Structure Based on Inverse Finite Element Method

Abstract

The Inverse Finite Element Method (iFEM) is a newly emerging displacement field identification method in recent years. This method reconstructs the displacement field of a structure as a whole using a finite number of strain measurement points. It is more straightforward, efficient, and cost-effective compared to existing methods and can be applied to real-time structural monitoring. To understand the structural response of the flight deck during the collision process of a naval helicopter landing on a ship, this paper takes an amphibious assault ship as the research subject and reconstructs the displacement field of the deck structure under the impact load of the landing. First, it obtains the time-varying curve of the impact load on the deck during the collision process, applies it as an external force in the landing area for simulation, uses the obtained nodal displacement results as reference solutions, and reconstructs the displacement field using the strain data obtained by finite element simulation as the measured strain data from the inverse finite element method. The simulation results show that the inverse finite element method can reconstruct the displacement field of the deck during the collision between the helicopter and the ship in real-time.