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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part K, Journal of Multi-body Dynamics >Global nonlinear dynamic characteristics of rod-fastening rotor supported by ball bearings
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Global nonlinear dynamic characteristics of rod-fastening rotor supported by ball bearings

机译：球轴承支撑的杆紧固转子的整体非线性动力学特性

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摘要

Flexible rod-fastening rotor-ball bearing system (FRRBS) is usually adopted in aircraft engines. In this paper, a simplified model for the FRRBS is proposed, and the global nonlinear dynamic characteristics of FRRBS are investigated. The FRRBS has two kinds of special structural features: rods and interfaces. The circumferentially distributed rods are modelled as a constant stiffness matrix with an additional moment (when unequal pre-tightening occurs) without mass effect. The interfaces between disks are modelled as stiffness matrices with normal and tangential contact stiffness, which are determined by pre-tightening force. Then, the shaft is discretized by Timoshenko elements and supported by ball bearings with radial internal clearance. Periodic motions and bifurcation sets are obtained by shooting method. The result shows that the insufficient pre-tightening brings about abnormal vibrations through quasi-periodic instability in high speed region, and the unequal pre-tightening leads to severe vibrations in stable periodic operation state. Moreover, the mass eccentricity would be the most nonlinear source for the nonlinear instabilities. Generally, this paper presents a method for modelling a FRRBS to study the nonlinear dynamic characteristics of the FRRBS.
机译：飞机发动机通常采用柔性杆紧固转子-球轴承系统（FRRBS）。本文提出了一种FRRBS的简化模型，并研究了FRRBS的整体非线性动力学特性。 FRRBS具有两种特殊的结构特征：杆和接口。周向分布的杆被建模为恒定刚度矩阵，并带有附加力矩（当发生不相等的预紧时），而没有质量效应。圆盘之间的界面建模为具有法向和切向接触刚度的刚度矩阵，该刚度矩阵由预紧力确定。然后，轴由Timoshenko元件离散化，并由具有径向内部游隙的球轴承支撑。周期性运动和分叉集通过射击方法获得。结果表明，预紧力不足会在高速区域内因准周期的不稳定性而引起异常振动，而不相等的预紧力则会在稳定的周期性工作状态下导致剧烈的振动。而且，质量偏心率将是非线性不稳定性的最非线性来源。通常，本文提出了一种对FRRBS建模的方法，以研究FRRBS的非线性动力学特性。

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  • 来源
  • 作者

    Yi Jun; Liu Heng; Liu Yi; Jing Minqing;

  • 作者单位

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Key Lab, Educ Minist Modern Design & Rotor Bearing Syst, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Key Lab, Educ Minist Modern Design & Rotor Bearing Syst, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Key Lab, Educ Minist Modern Design & Rotor Bearing Syst, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Key Lab, Educ Minist Modern Design & Rotor Bearing Syst, Xian 710049, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Rod-fastening rotor; contact interface; bifurcation; ball bearing; clearance;

    机译：杆紧固转子;接触界面;分叉;滚珠轴承;间隙;

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