航空发动机燃油弯管结构参数对固有频率的影响规律研究OA

It is necessary to study the influence of structural parameters of fuel bent pipes on the natural frequency of aircraft engines for the investigation of the vibration modal characteristics of aviation fuel bent pipes.Firstly,the modal analysis of a simple fixed support pipeline is conducted through simulation experiments.Secondly,the force hammer method is used for testing to verify the accuracy of the simulation data.Thirdly,the finite element mode-ling is conducted on fuel bent pipes with different external assembly parameters,and the changes in modal shapes and natural frequencies of each order are analyzed.Finally,based on the principles of dynamics,the reasons for the variation of natural frequency with assembly parameters are explained.The results show that the first mode of vibra-tion of the bent pipe is a bending deformation,with a maximum deformation of 96.63 mm,and the main vibration direction is in the Z direction;The second stage is the second bending deformation,with a maximum deformation of 78.20 mm,and the main vibration direction is in the Y direction.Radius,span,and bending radius are the main structural parameters that affect the natural frequency of bent pipes.