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Dynamic Analysis for Helicopter Tail Rotor Transmission System

Author: CongJiaYong
Tutor: ZhuRuPeng
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Design and Theory
Keywords: Helicopter transmission Kinetic analysis Tail rotor Bending vibration Torsional vibration
CLC: V214
Type: Master's thesis
Year: 2008
Downloads: 223
Quote: 2
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Abstract


Helicopter drivetrain , tail drive system is an important part . Accurately predict the tail drive system vibration response is to improve the the helicopter overall performance of one of the key technologies . In this paper, based on analysis of the structural characteristics of the helicopter tail drive , create a model of the tail drive . Reasonable assumptions and simplifications of the model of the helicopter 's tail rotor power transfer process , resulting mathematical model , the application of mechanical vibration theory to establish the overall vibration differential equations with Matlab software to analyze the dynamics of the helicopter tail drive , get the the system 's natural frequencies and mode shapes . This article describes a helicopter tail drive power transmission and the transmission process . According to the structural characteristics of the helicopter tail drive a helicopter tail drive analog system , the kinetic model . Calculation of the bending vibration characteristics , the level of the drive shaft and the tail oblique axis simplified massless spring axis segment coupling , the coupling quality , so it is necessary to consider the quality of the coupling of the entire system impact simplified form of concentrated mass points , intermediate reducer , bevel gear reducer tail also simplified form of concentrated mass point the helicopter tail drive system , this can be simplified into a concentrated mass - spring system ; calculated torsional vibration characteristics , the horizontal drive shaft , tail oblique axis is still equivalent to a massless spring form the bevel gear couplings , middle the reducer and tail of equivalent into a disk form , so the system is simplified into a round plate - spring system . Simplified model , respectively, after the establishment of differential equations , in which the bending vibration characteristics can be calculated by matrix transfer method using the boundary conditions of the system dynamics ; application of Newton's method can directly establish torsional vibration characteristics of the differential equations ; With Matlab software powerful computing power , according to the form of the resulting equation editing the corresponding computer program , the resulting helicopter tail drive dynamics .

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