螺栓连接对转子动力特性影响的研究
发布时间：2018-08-27 19:33
【摘要】：转子是航空发动机的重要组件之一，转子动力学特性直接影响航空发动机整机性能及其工作可靠性。螺栓连接以结构简单、连接刚性好等优点广泛应用于航空发动机结构中。在转子结构设计中，螺栓连接结构设计多采用经验公式，近些年对其结构刚性，动力学特性及其对整个转子动力特性的影响更是缺乏深入的研究。近些年随着计算机及有限元技术的发展研究的不断深入，螺栓连接结构及其动力学特性的研究越来越受到重视。 本文首先对螺栓连接结构的接触问题进行了研究，，对影响螺栓连接结构法向接触的主要参数进行了分析，通过对几种典型的试验件进行模态试验，并与有限元计算结果对比分析，表明了两种方法所得到的结果有较好的一致性，证明有限元数值仿真可以很准确模拟螺栓连接结构动力学特性。然后通过利用有限元方法，对影响螺栓连接结构参数（如安装边厚度，高度，接触面摩擦系数等参数）进行灵敏度分析，并通过多目标驱动优化设计方法实现了螺栓连接结构弯曲刚度的优化设计。 使用有限元方法对典型的转子螺栓连接结构进行了动力学特性分析，得到了螺栓预紧力影响模态频率的大小。并基于螺栓预紧力确定的分离准则、强度准则，疲劳寿命准则，在转子工作范围内，计算出合理的螺栓预紧力数值的大小。并依据所得到的结果选取几组合理的螺栓预紧力数值，使用Compbell图方法得到了螺栓预紧力对转子临界转速数值的影响，并通过使用瞬态动力学方法模拟转子的加速过程，验证了Compbell图方法计算的正确性。最后，通过对某型航空发动机涡轮转子结构进行建模分析，研究了螺栓预紧力对实际发动机转子结构的动力学特性的影响，并考虑了稳态温度场对转子结构的动力学特性的影响。为今后进一步分析多种载荷下螺栓连接对转子动力学特性的影响打下了基础。
[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.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH131.3
本文编号：2208231
[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.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH131.3
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