Effect of Ship Motion on the Vibration Response of Turboprop Engine under Carrier Landing Impact Load

Marine vessels undergo wave-induced motions that amplify impact loads during ship-based aircraft landings, challenging the structural integrity and service safety of aero-engine isolation systems. To address this challenge, this study establishes a coupled ship–fuselage–engine model, investigating the damping performance of a turboprop engine isolation system under impact loads induced by ship heave. The model establishes an equivalent representation of the dynamic interaction between wave-induced ship heave motion and landing impact. It is experimentally validated using a high-energy drop-impact test platform, demonstrating high predictive accuracy with maximum deviations below 5% in vibration amplitude and under 8% in pulse width. As the ship heave velocity increases from 0[Formula: see text]m/s to 0.793[Formula: see text]m/s, the peak vibration amplitudes rise significantly from 52.48[Formula: see text]m/s 2 to 86.72[Formula: see text]m/s 2 at the front-left position, from 55.17[Formula: see text]m/s 2 to 93.88[Formula: see text]m/s 2 at the front-upper position, and from 64.54[Formula: see text]m/s 2 to 107.05[Formula: see text]m/s 2 at the rear-left position. Further analysis reveals that the damping efficiency of the front isolators improves notably with increasing impact energy, attributed to the nonlinear hysteretic behavior of the isolation rubber. These findings provide valuable insights for optimizing aero-engine isolation systems in shipboard landing applications.