Analysis And Experimental Research On Dynamic Response Of Shipborne Aircraft Blocking Ship

The carrier-based aircraft uses a high-speed,short-distance,forced-action blocking landing method to complete the entire process from approach,glide,blocking hook and hang rope to standstill in a very short time.This "ground-dropping" landing method exerts a huge impact load on the fuselage structure and the landing gear device,which may cause structural damage to the landing gear structure,an overload on the fuselage,and a dangerous point of excessive strain resulting in local damage.Based on the multi-rigid-body coupling motion of the carrier aircraft,the force analysis of the landing gear,barrage device and airframe structure is carried out.Based on the six-degree-of-freedom motion model of the carrier-based aircraft,coupled with the front-rear landing gear,the blocking device and the airframe structure motion relationship,the translational dynamic equations of the rigid-body centroid of the carrier-based aircraft and the pitch-and-rotation dynamics of the carrier-based aircraft are obtained.Learn equations to reveal the movement laws of carrier-based aircraft.Aiming at the airframe strength problem in the process of a shipborne UAV blocking the ship,the fuselage structure is taken as the main research object,and the structure including the middle fuselage structure and the front and rear fuselage,the wing dummy and the blocking hook are designed for the first time.The ground blocking simulation test program and the corresponding device were built.The ground response and the rigid-flexible coupling simulation were used to analyze the dynamic response characteristics of the middle fuselage structure under the impact of the blocking resistance during the landing process.The test and simulation results show that the maximum heading overload of the middle fuselage attenuates along the two main force transmission paths from the rear fuselage to the front fuselage,and the peak of the overload of the lower transfer path point is significantly greater than the peak of the upper transfer path point;the maximum overload point is found Located at the blocking joint,the strain danger point is located at the front section of the web beam;the test and simulation overload errors of each measuring point on the middle fuselage structure are within 5%,and the strain error is within 8%,which verifies the rigid-flexible coupling numerical simulation The feasibility of the method.The above results can provide an important reference for the strength design of the shipboard UAV fuselage structure,and provide a basis for the subsequent analysis of the blockage of the shipboard UAV and the prediction of the response of the fuselage structure.This paper studies the dynamic response of the landing gear and the dynamic strength of the fuselage when the carrier-based aircraft blocks the ship under the conditions of crosswind,pitch and roll.Based on a certain type of shipboard unmanned aerial vehicle,the rigid-flexible coupling simulation method is used to obtain the rigidflexible coupling blocking model of the whole machine under complex loads.The simulation analysis shows that the aircraft stopping distance is not affected by the three working conditions;The motion causes the pitch angle of the center of mass of the aircraft and the angle of the carapace to become smaller,and the landing gear landing time is delayed to a maximum of 0.33s;the normal overload value of the wing point under pitching motion is significantly less than the other two operating conditions.The maximum normal overload of the wing is located near the mid fuselage,and the maximum value reaches 63 g.Its distribution trend is that the normal overload value of the wing gradually decreases along the direction of the wing tip;under the conditions of crosswind and rolling The trend of the strain curve with time is almost the same,and the amplitude of the strain under pitching conditions is smaller than that under crosswind and rolling conditions.The fuselage attitude,strength,and landing gear response results are analyzed to obtain the law of the effects of various sea states on landing results,which can provide a reference for the feasibility of shipboard UAV landing under complex sea conditions.