Structural Design And Simulation Analysis Of Jet Double-rotor Aircraft

In recent years,micro-rotor aircraft has become a hot research topic for scholars because of its light weight,small size,and the ability to change the direction of motion at will.However,due to the complex structure of the traditional rotorcraft,poor attitude control sensitivity,and the inability to separate the power compartment and the load compartment,the aircraft's flight maneuverability is slow and the loss is large in the event of failure.Based on this,a new type of aircraft,jet twin-rotor aircraft,is proposed.The jet method is used to control the flight posture to improve the maneuverability of the aircraft.The aircraft's power compartment and load compartment can be quickly separated.Once a fault is encountered,the load compartment can be independently parachuted to protect important cargo.The research of this subject has important theoretical significance and high practical value for the development of jet double-rotor aircraft.According to the realization function and design requirements of the jet twin-rotor aircraft,the overall scheme of the aircraft is studied.The aircraft is divided into five parts,namely the power unit,the rotor mechanism,the supercharging device,the rudder-controlled jet device and the whole machine control system.The components of each part are determined,and the working principle is explained.The feasibility of the overall scheme of the aircraft is demonstrated.According to the design requirements,the take-off weight of the aircraft is determined first;Then,the feasible structural parameters are determined based on the design example of impeller,including outlet diameter,inlet diameter,width of inlet blade and number of blades.The process parameters of the aircraft are then determined,including the absolute exit speed of the impeller,the ejection pressure of the upper guide ring gas,and the pneumatic thrust of the nozzle;Finally,the performance parameters such as motor power,rotor tension and resistance moment are obtained.the aircraft's powerplant,rotorcraft,supercharger,rudder-controlled jet,fuselage and load compartment were designed and 3D modeling indetail.According to the assembly of the designed parts,the assembly drawing of the aircraft is obtained and the engineering drawing is made.Through the three-dimensional interference check function,the interference of the whole assembly is eliminated,and a virtual prototype of a jet double-rotor aircraft with reasonable structure and feasibility is obtained.Based on AnsysWorkbench software,the aircraft fuselage structure is simulated and analyzed.The finite element model of the fuselage was established,and the strength and stiffness were analyzed respectively.It was found that the maximum stress of the hollow tube at the connection between the upper and lower fuselage did not meet the allowable stress of the material.Then the fuselage structure was improved and checked.Finally,the improved body was modal analyzed and the first 12 modes were extracted.It was found that the excitation frequency of the motor and rotor outside was much larger than the natural frequency of the 12th mode.Therefore,it can effectively avoid low-frequency resonance.