| The service environment of civil aircraft hydraulic pipeline system is extremely bad,so the analysis of its mechanical characteristics has been paid much attention.In addition to the medium pressure load,ambient temperature load and acceleration load,the hydraulic pipeline system of civil aircraft often bears large body deformation and vibration load,which has a great impact on its structural reliability and safety.In order to solve the problem that the airfoil deformation will produce large prestress in the hydraulic pipeline system of the wing,the research on the stress distribution law and dynamic characteristics of the hydraulic pipeline system of the wing under different load conditions is carried out.The research work is expected to provide certain theoretical support for the design and analysis of aircraft wing hydraulic pipeline system,and has certain engineering value for improving the reliability and safety of aircraft hydraulic pipeline system.The main contents of this paper are as follows:(1)The mechanical model of wing hydraulic pipeline is established.According to the three different stress states of the pipeline,such as tension,bending and torsion,the pipeline stress is calculated.Based on the transmission path theory,the vibration transmission path model of aircraft wing hydraulic pipeline system is established,and the modeling and analysis method of transmission characteristics of hydraulic pipeline vibration system is obtained.The influence parameters of the model are analyzed,and the vibration transmission evaluation index of the wing hydraulic pipeline system is constructed.(2)Static stress analysis of wing hydraulic pipeline system.The displacement distribution law of ARJ21-700 aircraft body deformation load on the support points of wing hydraulic pipeline is analyzed by interpolation method,which is regarded as the external load for static stress analysis of wing hydraulic pipeline.The finite element model of ARJ21-700 aircraft wing hydraulic pipeline system is established,and the displacement load generated by the body deformation is applied.Then the stress distribution law of the wing hydraulic pipeline system under the load conditions of "no body deformation + design pressure","limited displacement + design pressure" and "limit displacement + Design pressure" is analyzed respectively.(3)Dynamic characteristics analysis of wing hydraulic pipeline system.Based on the finite element power flow theory,a finite element model of a wing hydraulic pipeline system with three pipe supports is established,and the modal analysis is carried out.Then the most sensitive support position and the most important transmission of vibration response are identified under the load conditions of "no deformation + sinusoidal excitation","limited displacement + sinusoidal excitation" and "limit displacement + sinusoidal excitation" route.(4)Experimental study on hydraulic pipeline of aircraft wing.Taking the local hydraulic pipeline of ARJ21-700 aircraft wing as the test object,the finite element analysis model and simulation analysis method are verified through pipeline stress analysis and modal analysis verification test. |
