Study On Vibration Transfer Path And Regularity Of Aircraft Hydraulic Pipeline System

In recent years,the C919,ARJ21-700 and other models have made a huge breakthrough in China.The engine is the heart of the aircraft and electro-hydraulic power control and actuation system is vascular and muscle,which is the sign of the aircraft strong body.But aircraft hydraulic pipeline system vibration is more complex with the increase of pressure system which has brought a huge problem to its smooth flight.However,limit to spatial structure,the spatial configuration and restraints of aircraft hydraulic pipeline systems and the coupling between pipelines are extremely complex which leads that its vibration mechanism is difficult to explore.The typical aviation hydraulic pipeline system is regarded as the research object in this article,and the method of vibration transfer path analysis is used to study the mechanical vibration transfer law.The main research contents and work are as follows.1.Investigate and summarize the research results and research status of domestic and foreign civil aircraft,aircraft hydraulic pipeline system vibration mechanism,vibration transfer path method and so on,and establish the main research work of this paper.2.The transfer matrix method and ABAQUS software platform were used respectively for its numerical calculation and simulation analysis with the domestic civil aircraft ARJ21-700 No.2 hydraulic system in a typical space pipeline.Compared the calculation results of the two and the inherent vibration characteristics of the pipeline are obtained.3.Considering the constraint effect of the space pipeline,the physical model of hydraulic pipeline system including pipe support,clamp,pipe joint and so on was established.Based on power flow theory,hydraulic pipeline system vibration transfer model was established by structural admittance method,and the vibration energy transfer law in pipeline system under different excitation was analyzed.4.According to the vibration transfer model of the hydraulic pipeline system above,the finite element kinetic equation was established,and the power flow expression of each component of pipeline system was constructed.The power flow distribution of each vibra-tion receptor was analyzed by finite element power flow method,and the main path of vibration transfer was identified by the transfer path analysis method.5.Performed on hammer mode experiment and vibration response of hydraulic pipeline system with different pressure and speed,and which was compared with the results of theoretical analysis to verify the accuracy.The vibration transfer model of complex hydraulic piping system presented in this paper is established by structural admittance method,and its vibration energy transfer law is analyzed.Meanwhile,the power flow distribution of each vibration receptor is analyzed by finite element power flow method.Both methods have a certain degree of innovation.