LI En-guo 1 ， YU Yin-xin 1，2 ， XU Liu-shuang 1.Dynamic Characteristics Analysis of Carbon Fiber Shaft Titanium Alloy Membrane DiskCoupling in Non-Inertial System[J].航空发动机,2024,50(6):88-93
Dynamic Characteristics Analysis of Carbon Fiber Shaft Titanium Alloy Membrane DiskCoupling in Non-Inertial System
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Key Words:membrane disk coupling  carbon fiber  titanium alloy  non inertial frame  coupled vibration
Author NameAffiliation
LI En-guo 1 ， YU Yin-xin 1，2 ， XU Liu-shuang 1 1. School of Mechanical and Electrical Engineering， Kunming University of Science and Technology， 2. Yunnan Key Laboratory of Intelligent Manufacturing Technology for Advanced Equipment ：Kunming， 650500， China 
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Abstract:In view of the demand for high-speed shaft with large span and misalignment, the new flexible coupling composed of titanium alloy membrane disk (TC4 disk) and carbon fiber shaft (CF shaft) is the key component to meet this demand. In this paper, the carbon fiber shaft titanium alloy membrane disk coupling is taken as the research object. Based on the bending pendulum shaft coupling mechanical model in the non inertial system, the Runge Kutta method is used to solve the coupling modal and dynamic response. The influ? ence of the intermediate shaft span, materials and lateral rotation of the installation platform on its dynamic characteristics is discussed. The research results show that the rotor system will generate additional stiffness matrix and damping matrix when the membrane disk coupling installation platform has rotational speed and acceleration, which will cause axial and radial coupling vibration. When the axial stiffness is relatively small compared with the radial stiffness, the influence of platform motion on the axial vibration must be considered; The increase of the span of the intermediate shaft will lead to the decrease of the natural frequencies of each order and the increase of the peak resonance response; The intermediate shaft made of carbon fiber can obviously increase the natural frequencies of each order and reduce the peak vibration response; The lateral rotation of the platform will not only increase the resonant response frequency, but also cause the overall vibration of the coupling to deviate from the static balance position. The offset varies with the span and material of the intermediate shaft.
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