Analysis Of "Ship Resonance" Characteristics Of Helicopter’s Rotor-Landing Gear System

"Ship resonance" is the helicopter rotor-fuselage coupled system instability phenomenon that appears during the take-off and landing of shipboard helicopter.When "Ship Resonance" occurs,the centrifugal excitation force generated by the rotor system is close to a certain natural frequency of the fuselage on the landing gear.The natural modes corresponding to the fuselage can cause the rotor to vibrate in the plane of rotation,And the landing gear buffers and rotor dampers are not capable of dissipating the "ship resonance" energy produced in each cycle.Therefore,"Ship Resonance" has energy accumulation in each cycle of vibration,which may cause the helicopter to destroy in a short period of time.Due to the non-linear characteristics of rotor damper and landing gear buffer,this paper uses numerical simulation method to simulate the helicopter "ship resonance" characteristics.Prior to this,the layout and configuration of the shipboard helicopter landing gear were determined according to the design requirements of the shipboard helicopter.The parameters of the landing gear damper were determined according to the results of the virtual shock test.The parameters of the rotor damper were determined according to the "ground resonance" stability virtual experiment.Build the multi-body system model required for "Ground Resonance" and "Ship Resonance" simulations in LMS Virtual.Lab Motion.The hydraulic model of the main landing gear and the nose landing gear as well as the rotor damper model were developed at LMS Imaging.Lab AMESim.In this paper,landing gear virtual experiment to determine the landing gear related parameters,through the "ground resonance" virtual experiment to determine rotor damper related parameters,in determining the above "Ship Resonance" stability of the relevant parameters,the different ships Motion state and damping of different dampers to simulate the "ship resonance".According to the simulation results,the influence of different ship motion states and damped dampers on the stability of "ship resonance" is compared.