In view of the advantages of lightweight, high strength, easy cooling, and easy assembly, the rod-fastened rotor is widely used in the aeroengine and heavy gas turbine. However, because of assembly, stress relaxation, material creep, and other reasons, the clamping force of the tie rods will be out of tune during the long-term operation of the rotor. The detuning of the clamping force of the tie rods not only affects the contact stiffness of the contact interface but also causes the rod-fastened rotor with a certain residual shaft bow, which will affect the dynamic characteristics of the rod-fastened rotor. Based on the statistical model of rough surface contact (GW contact model), this paper presents a method to calculate the equivalent flexural stiffness of rough surface considering the detuning of the clamping force of the tie rods and gives the calculation method of the residual shaft bow deformation of the rod-fastened Jeffcott rotor with detuning of the tie rods. The effect of the preload, the rate of detuning of the tie rods, the number of detuning tie rods on the natural frequency, and the response of residual shaft bow of the rod-fastened Jeffcott rotor at a certain speed are investigated. The results show that the detuning of the tie rods makes the flexural stiffness of the rotor inconsistent along with two main stiffness directions of the rotor, which makes the natural frequency of the rotor divided into two. The negative detuning of the tie rods decreases the natural frequency of the rotor, while the positive detuning of the tie rods increases the natural frequency of the rotor. The smaller preload or the larger rate of detuning of the tie rods makes the detuning of the tie rods have a greater influence on the natural frequency of the rotor. These results will provide a theoretical reference for the dynamic analysis and design of the rod-fastened rotor.

中文翻译：

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拉杆夹紧力失谐对杆固式Jeffcott转子动力性能的影响

鉴于重量轻，强度高，易于冷却和易于组装的优点，杆紧固转子广泛用于航空发动机和重型燃气轮机。但是，由于组装，应力松弛，材料蠕变和其他原因，在转子的长期运行过程中，拉杆的夹紧力会失调。拉杆的夹紧力的失调不仅会影响接触界面的接触刚度，而且还会导致带有一定残留轴弓的连杆固定式转子，这会影响连杆固定式转子的动态特性。基于粗糙表面接触的统计模型（GW接触模型），本文提出了一种考虑拉杆夹紧力失谐的粗糙表面当量抗弯刚度的计算方法，并给出了拉杆失谐时带杆杰斐科特转子的残余轴弓变形的计算方法。研究了预紧力，拉杆失谐的速率，拉杆失谐的数量对固有频率的影响以及杆固式Jeffcott转子在一定速度下的残余轴弓响应。结果表明，拉杆的失谐使转子的挠曲刚度与转子的两个主刚度方向不一致，从而使转子的固有频率分为两个。拉杆的负失谐会降低转子的固有频率，拉杆的正向失谐会增加转子的固有频率。拉杆的较小的预紧力或较大的失谐速率使连杆的失谐对转子的固有频率具有更大的影响。这些结果将为杆紧固转子的动力学分析和设计提供理论参考。