Lightweight Research On Shock Absorbing Strut Based On Additive Manufacturing

In recent years,with the changes in the international environment,the development of the marine field has become increasingly important.China has been committed to building a "blue water navy" to strengthen military strength at sea and protect China’s maritime rights and interests and maritime security.In order to cope with the increasingly diverse maritime security threats,countries are investing more and more in marine equipment.Through the research on the maintenance and support system of the world’s military power naval ships,it can be found that foreign countries have applied additive manufacturing technology to the maintenance and support of ship parts at present,as well as the manufacture and remanufacturing of equipment of weapons,effectively reducing the manufacturing cost of parts and realizing the rapid manufacture of many kinds of ship parts and the instant replacement of failed parts when the ship is operating far from sea.At the same time,the application of additive manufacturing technology has greatly reduced the total amount and weight of shipboard spare parts,greatly improving the maneuverability of the ship and the combat effectiveness of the navy.This paper uses the finite element method to simulate and analyze the landing process of the carrier aircraft,then obtains the transient impact load of the landing gear shock struts.On this basis,the lightweight design of shock absorption strut structure based on additive manufacturing technology was studied by using topology optimization method,and finally the lightweight design of the shock absorber strut structure was realized by using topology optimization technology and spatial lattice structure.By analyzing the working environment of landing of landing gear,modeling the landing gear of the carrier aircraft,simulating the impact of the landing gear,the maximum load on the shock absorption strut of the landing gear during landing is obtained.Then,the lightweight research on the absorption strut structure is carried out,and the influence of factors such as symmetry constraints,element sizes,penalty coefficients,and volume constraints on the results of topology optimization are analyzed.After analysis,it is found that the topological optimization results have good performance with symmetrical constraints,a minimum element size of 48 mm,a penalty factor of 1.5,and a volume constraint of 40%.After the topology optimization,the optimal structure of the shock absorption strut is obtained,the preliminary conceptual design is completed,and the topological optimized structure is geometrically reconstructed.And in the context of additive manufacturing,the porous structure design of the shock absorption strut is carried out,including regular porous structure and irregular porous structure design,and the impact of the size of the porous structure on the shock absorption strut is studied.At the end of this paper,the results after optimization are compared with those before optimization.The maximum stress on the shock-absorbing pillars is reduced by 16.67% compared to the stress before optimization,and the quality of the design area of the shock absorption strut is reduced by 18%.The porous structure is simulated by additive manufacturing,the deformation and the maximum stress of the porous structure are obtained.The heat treatment of the porous structure results in a significant reduction in the deformation and maximum stress of the porous structure.The vibration modes of the shock absorption strut before and after optimization are analyzed.