Carbon Composite Applicution To Helicopter Tail Transmission System

Tail transmission shaft is one of the important dynamic part of helicopter,it transmits Speed and power as the composition of helicopter.Horizontal tail shaft and inclined tail shaft are composed Tail transmission shaft.Inclined tail shaft between IGB and TGB,installed in the tail oblique beam.Its weight and dynamic has a great influence on the performance of the helicopter.As Carbon Fiber Reinforced Polymers have the advantages of high strength,small specific gravity,high temperature resistance and corrosion,It can be lighter 20~30% than metal.The composite materials has been regarded as the best candidates to replace traditional metal,it is good for light weight and low vibration performance.Carbon Fiber Reinforced Polymers is anisotropy.Along the direction of the fibers,the composite material has good tensile and compressive properties.The performance parameters of the CFRP can be designed.In the design and manufacture of the drive shaft,CFRP can provide a large number of possible designs,which should satisfy the different dynamic performance requirements.In this thesis,We mainly study on dynamic and intension calculate method of Carbon Fiber shaft.Firstly,According to the design requirements for Carbon shaft layer design;Then,through the experience way,using Matlab software to calculate the critical speed and strength of Carbon Fiber shaft;Then,the shaft was established based on MSC/NASTRAN?MSC/PATRAN software of finite element model for modal analysis and strength analysis;Finally,to confirm the scheme of the tail shaft and passed the dynamic test and strength test.A t the same time,Laying angle on the shaft natural frequency and intensity of influence.