Analysis On Dynamic Characteristics Of Shipborne Helicopter Assited Deck-landing

At present,most of the research on the dynamics of ship-borne helicopters focuses on the dynamic stability of the rotor/fuselage coupling system during the take-off phase of the helicopter on the deck.Actually,the accident rate of the ship-borne helicopter in the landing stage is quite high,however,the dynamic stability of the process is less studied.In addition,the research on the dynamic stability of the ship-borne helicopter landing section under the influence of the assisting device is even rarer.Therefore,studying the stability characteristics of ship-borne helicopters assisted landing dynamics has important theoretical significance and engineering application value for further improving the landing safety of helicopters under severe sea conditions.Firstly,considering the practical application scenarios of ship-borne helicopters and the real wave situation,a random sea wave model based on power spectrum function is established.In addition,the Conolly theory is used to establish the ship's deck roll,pitch and heave motion models.Then,according to the generalization of Hamilton's principle in non-conservative systems,combined with multi-body dynamics modeling method,the dynamic model of helicopter rotor-fuselage coupling system including assisting device is established.Appropriate conditions are designed according to the deck motion laws under different sea conditions,different speeds and different wave angles before the dynamic stability of the coupled system is numerical analyzed by the combination of the state space eigenvalue method and the fourth-order Runge-Kutta method.Finally,with the help of commercial softwares,a multi-rigid system simulation model including helicopter rotor,fuselage,landing gear,and assisting device is built,as well as the hydraulic model of the landing gear buffer.On the basis of the virtual deck-landing test,the dynamics co-simulation test of the shipborne helicopter's deck-landing is carried out to study the dynamic stability of the rotor/fuselage coupling system under the influence of different assisting devices,which compares the effectiveness and application range of different assisting devices.