Research On Lightweight Of Civil Aircraft Emergency Door Hinge Bracket Based On Topology Optimization Method

The emergency door of a civil aircraft is one of the doors of a civil aircraft,which mainly guarantees that the crew can leave the aircraft quickly when encountering an emergency.However,the civil aircraft emergency door has a complicated structure and a large number of connecting rods and hinges,and its stable operation directly affects whether the flight crew can leave quickly and safely.In order to ensure the normal opening and closing actions of the emergency door,the hinge bracket of the emergency door should have sufficient rigidity and strength,which leads to the large size and weight of the hinge bracket.In this paper,aiming at the structural optimization of the hinge bracket of the emergency door,on the premise of meeting the service performance and weight reduction requirements of the emergency door,the method of topology optimization is used to design the hinge bracket of the emergency door,and the opening of the emergency hatch is designed to be lightweight.The closed process is used for motion analysis and mechanical property testing of key components.The main research contents are as follows:Firstly,based on the main structure and opening and closing movement process of the emergency door of civil aircraft,the movement process of the handle mechanism,the latch mechanism,the lifting mechanism and the hinge four-bar mechanism during the unlocking,lifting and opening and closing of the emergency door is studied.According to the opening and closing process of the emergency door,the stress of the hinge bracket is analyzed.Ansys Workbench was used to establish the simulation model of the hinge bracket of the emergency door,and the statics simulation was carried out to analyze the force of the hinge bracket of the emergency door,which provided a theoretical basis for the finite element analysis and topology optimization of the hinge bracket.Secondly,in view of the problems of material redundancy and heavy weight of the original hinge bracket,based on the variable density method,with the structural volume as the constraint and the structural flexibility minimization as the goal,the topology optimization of the emergency hatch hinge bracket is carried out.According to the topology optimization results of the hinge bracket,the lightweight design of the hinge bracket is carried out,and the reasonable material distribution of the hinge bracket is obtained,which reduces the weight of the hinge bracket,and the strength of the optimized hinge bracket is checked.Finally,the prototype of the original hinge bracket and the optimized hinge bracket were prepared based on the photocuring molding technology.The mechanical comparison test of the original hinge bracket and the optimized hinge bracket was carried out using an Instron mechanical testing machine.The load and displacement variation laws of the original hinge bracket and the optimized hinge bracket were studied to verify the reliability of the lightweight hinge bracket designed by topology optimization.