螺栓連接對轉(zhuǎn)子動力特性影響的研究
[Abstract]:Rotor is one of the important components of aero-engine. Rotor dynamic characteristics directly affect the performance and reliability of aero-engine. Bolt connections are widely used in aero-engine structures with the advantages of simple structure and good connection rigidity. In the design of rotor structure, the empirical formula is often used in the design of bolted connection structure. In recent years, the structural rigidity, dynamic characteristics and its influence on the dynamic characteristics of the rotor are lack of in-depth study. In recent years, with the development of computer and finite element technology, more and more attention has been paid to the research of bolted connection structure and its dynamic characteristics. In this paper, the contact problem of bolted connection structure is studied, and the main parameters affecting the normal contact of bolted connection structure are analyzed, and the modal tests are carried out on several typical test pieces. The results obtained by the two methods are in good agreement with those obtained by the finite element method. It is proved that the finite element numerical simulation can accurately simulate the dynamic characteristics of bolted connection structures. Then by using finite element method, the sensitivity analysis of structural parameters (such as installation edge thickness, height, friction coefficient of contact surface, etc.) is carried out. The optimum design of bending stiffness of bolted connection structure is realized by multi-objective driving optimization design method. The finite element method is used to analyze the dynamic characteristics of a typical rotor bolted connection structure, and the magnitude of the influence of bolt preload on the modal frequency is obtained. Based on the separation criterion, strength criterion and fatigue life criterion determined by bolt preload force, the reasonable pre-tightening force value of bolt is calculated in the working range of rotor. According to the obtained results, several groups of reasonable bolt preload values are selected, and the effect of bolt preloading force on rotor critical speed is obtained by using Compbell diagram method, and the acceleration process of rotor is simulated by transient dynamic method. The correctness of the Compbell diagram method is verified. Finally, by modeling and analyzing the turbine rotor structure of an aeroengine, the effect of bolt preload on the dynamic characteristics of the rotor structure is studied. The effect of steady temperature field on the dynamic characteristics of rotor structure is considered. It lays a foundation for further analysis of the effect of bolt connection on rotor dynamic characteristics under various loads in the future.
【學位授予單位】:沈陽航空航天大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TH131.3
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