Mechanical Properties Analysis And Optimization Design Of Folding Wing Unfolding Mechanism

Folding wing is an important part of the aircraft,which can improve the stability and maneuverability of the aircraft.Once an action fails,it can not complete the designated operational tasks.Potential failure modes of the mechanism are discovered by the FMEA technology.Kinematics analysis and dynamic analysis are used to verify its deployment performance,and finite element analysis are used to verify structural performance,and finally to optimize the folding wing unfolding mechanism.In this paper,a type of aircraft folding wing mechanism is regarded as research object,completing the following tasks:(1)Folding wing expansion mechanism FMEA analysis.Based on the composition and working principle of the folding wing deployment mechanism,as well as the technical requirements of the folding wing deployment mechanism.Based on the information obtained,the FMEA principle was used to determine the weaknesses of the folded wing deployment mechanism,providing direction for further analysis.Write FMEA table,as the key technical documents of product design,manufacture,use and maintenance.(2)Folding wing deployment mechanism to expand the characteristics of simulation.The multi-body dynamics software Adams was used to establish a rigid body model and a rigid-flexible coupling model.The deployment characteristics of the folded wing expansion mechanism(deployment time,deployment crash force,airfoil deployment synchronization,etc.)were evaluated.The design variables that affect the unfolding characteristics are parameterized to study the influence of driving parameters,loading parameters,dimensions and position parameters on the unfolding performance of the folding wings.(3)Static and Modal Finite Element Analysis of Folding Wing.According to the static analysis of airfoil base,airfoil and unlocking hook,it is analyzed whether the strength and rigidity of each component of the mechanism meet the requirements.Modal analysis to determine the folded wing expansion mechanism in the initial locking and unfolding in place locking two kinds of natural frequencies and modes.(4)Folding wings deployment mechanism optimization design.A cushion is added between the airfoil and the impact area of the airfoil base.The cushion is based on the two-parameter Mooney-Rivlin model.Folding wing material from the initial one piece of aluminum alloy was changed to the head of the airfoil using aluminum alloy,the airfoil part of the composite material,greatly reducing the airfoil quality,the airfoil to achieve lightweight.The ANSYS was used to establish the optimized finite element model,and the static analysis was carried out to improve the stress in the impact zone of the airfoil base.The performance analysis of the folding wing deployment mechanism and the optimization design of the structure have certain reference value and significance for improving the performance of the folding wing.