Research For Vibration-reducing Measures Of The Civil Aircraft Engine Pylon

With the rapid development of the world aviation industry, the design of civil aircraft is tending to larger and modularized. Meanwhile, to meet the higher and higher power requirement of the modern aircraft, the design standard of engine is tending to more powerful and more effective. As a result, the pylon which plays an important role in connecting the aircraft and the engine will be tested in more and more severe condition.The maintenance record of the airlines shows that the repairment of pylons is not alone and most of the faults is caused by the vibration of engines. Therefore, it is meaningful to study on the vibration of the pylon and offer vibration-reducing proposals.A common kind of pylon is chosen as the modeling prototype and the finite element method is used to analyze the model. The main work of this thesis can be summarized as follows:(1) The combination of A320-200 and CFM56-5B is chosen to be the modeling prototype, and then a computer-generated model of it is created by using CATIA.Based on the real situation, a lot of preparatory work has been done, such as setting the physical parameters, choosing the model material, analyzing the force situation of the model, etc.(2) A statics analysis and modal analysis is conducted on the model by using ANSYS Workbench. Then, the paper compares the simulation data with the actual values, and the result proves the accuracy of the pylon model.(3) A dynamics analysis is executed on the model, the main vibration transfer path in the pylon and the vibration performance of it are found out with the function of ANSYS post-processing.(4) Taking the analysis result in part 3 into consideration, some pertinent solutions and methods of vibration-reducing are given out.(5) The paper makes a conclusion of the study and gives some new ideas for thefurther research.