Effect of relative phase of loose tie rods on nonlinear dynamic behavior of rod-fastening rotor-bearing-seal system

IF 2.8 3区工程技术 Q2 MECHANICS International Journal of Non-Linear Mechanics Pub Date : 2024-09-03 DOI:10.1016/j.ijnonlinmec.2024.104888

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Abstract

Loosening of multiple tie rods in a circumferential rod-fastening rotor caused by thermal deformation and centrifugal loads is very common in engineering. The relative position of loose tie rods in the circumferential direction will also have an important impact on rotor dynamics. The relevant research has not been done yet. In this paper, a contact model of the rough machined surface is firstly established by combining the probability functions describing rough surfaces and fractal contact theory of asperities, then the contact stiffness model between disks is established based on the contact model. Finally, the dynamic model of the circumferential rod-fastening rotor-bearing-seal system is established and solved. The effect of relative phase of loose tie rods on the nonlinear dynamic characteristics of rod-fastening rotor-bearing-sealing system is studied. It can be concluded that relative phase of the loose tie rod has an important influence on the frequency, bifurcation, and periodic motion of the rotor system. At lower speed, the anisotropy of contact stiffness caused by loose tie rods has little effect on the rotor trajectory, while the generalized bending moment has a greater influence on dynamics of the system. At higher speed, the anisotropy of contact stiffness has a great influence on the axis rail of the rod-fastening rotor.

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松动拉杆的相对相位对拉杆紧固转子轴承密封系统非线性动态行为的影响

由热变形和离心载荷引起的圆周拉杆紧固转子中的多根拉杆松动在工程中非常常见。松动拉杆在圆周方向上的相对位置也会对转子动力学产生重要影响。相关研究尚未完成。本文首先结合描述粗糙表面的概率函数和分形接触理论，建立了粗糙加工表面的接触模型，然后根据接触模型建立了圆盘间的接触刚度模型。最后，建立并求解了圆周拉杆-紧固转子-轴承-密封系统的动态模型。研究了松动拉杆的相对相位对拉杆紧固转子-轴承密封系统非线性动态特性的影响。结果表明，松拉杆的相对相位对转子系统的频率、分岔和周期运动有重要影响。在较低转速下，松动拉杆引起的接触刚度各向异性对转子轨迹的影响很小，而广义弯矩对系统动力学的影响较大。在较高转速下，接触刚度的各向异性对拉杆固定转子的轴轨迹影响很大。

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来源期刊

International Journal of Non-Linear Mechanics 物理-力学

CiteScore

5.50

自引率

9.40%

发文量

192

审稿时长

67 days

期刊介绍： The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.