Dynamic Analysis And Structure Optimum Of Aircraft Thrust Reverser

In order to effectively reduce the running distance when landing,the large civil aircraft is usually equipped with a thrust reverser system on the engine.When aircraft landing,the system can change the air flow direction at the jet exit of the engine,so that the engine can generate reverse thrust to accelerate the control of the running speed of the aircraft,reduce the requirements for the length of the airport runway,and improve the work safety of the aircraft.The thrust reverser is a set of mechanical apparatus used to block the air flow at the outer duct of the engine in the thrust reverser system.The kinematics and dynamics characteristics of each component directly affect the normal opening and closing of the thrust reverser system.The analysis of force,kinematics and dynamics characteristics of each component can provide an important basis for structural design,parameter optimization of thrust reverser and power demand analysis of actuation system.In this paper,the research on the kinematics,dynamics analysis and structural optimization design of the thrust reverser is carried out.First of all,the structural characteristics and working principle of the typical cascade thrust reverser are analyzed.Based on that analysis,the simplified model of the thrust reverser moving components is established.According to the connection and movement relationship of each component,the kinematics and dynamics model of the thrust reverser is established.The displacement,velocity and force characteristic curves of each component of the thrust reverser are obtained by simulation.Secondly,the movement characteristics of each component and the load force of the thrust reverser under different size parameters are comparatively analyzed.Combined with the mechanical constraints of the thrust reverser when it works,the structural optimization model of the thrust reverser is established,the structural parameters of each component are optimized by using the penalty function method,and the validity of the structural parameters optimal solution is verified by combination of the Pro / E three-dimensional modeling and dynamics simulation of Adams.Finally,based on AMESim,the mathematical model of the hydraulic actuation system of the thrust reverser is established,and the influence of the thrust reverser and its actuation system on the system performance under different structural parameters is simulated and analyzed,as well as the influence of lateral force on the synchronization of the actuation system when the thrust reverser and the actuation system installing.