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1.天津大学 电气自动化与信息工程学院,天津 300072
2.浙江易锻精密机械有限公司,宁波 315702
3.太原理工大学 机械与运载工程学院,太原 030024
Received:07 December 2023,
Revised:06 February 2024,
Published:15 March 2025
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崔红伟,李冬辉,梅碧舟,等.片式离合器摩擦副热弹性不稳定性温度-压力扰动特性研究[J].机械传动,2025,49(3):1-7.
CUI Hongwei,LI Donghui,MEI Bizhou,et al. Research on thermoelastic instability and temperature-pressure perturbation characteristics of friction pairs in disc clutches[J]. Journal of Mechanical Transmission,2025,49(3):1-7.
崔红伟,李冬辉,梅碧舟,等.片式离合器摩擦副热弹性不稳定性温度-压力扰动特性研究[J].机械传动,2025,49(3):1-7. DOI: 10.16578/j.issn.1004.2539.2025.03.001.
CUI Hongwei,LI Donghui,MEI Bizhou,et al. Research on thermoelastic instability and temperature-pressure perturbation characteristics of friction pairs in disc clutches[J]. Journal of Mechanical Transmission,2025,49(3):1-7. DOI: 10.16578/j.issn.1004.2539.2025.03.001.
目的
2
为了研究多层材料摩擦副热弹性不稳定性(Thermoelastic Instability
TEI)及扰动场分布规律,针对摩擦元件最常见的摩擦片对称-对偶钢片反对称变形模态,采用伽辽金法建立了摩擦副热弹性不稳定性有限元模型。
方法
2
结合Matlab数值模型分析,通过坐标变换得到了对称-反对称模态下临界速度的径向分布与扰动增长系数变化规律;基于扰动法并结合有限元模型提出滑摩表面瞬态扰动场计算模型,获得了摩擦副滑摩表面温度和压力扰动场分布规律。
结果
2
结果表明,对称-反对称模态下,最低临界速度对应的扰动频率为主特征扰动,该扰动频率下,扰动增长系数增加最快;摩擦副外径处最先进入热弹性不稳定状态,然后随着相对滑摩角速度的增加而逐渐向内径扩展;温度和压力扰动场的波动沿摩擦副周向呈周期性分布,但线速度沿径向分布的差异导致外径处扰动幅值高于内径;当相对滑摩速度超过临界速度时,由于指数增长效应,扰动幅值会随相对滑摩时间的增加而迅速增长。研究结果为后续探究摩擦副热点形成机制以及温度和压力场分布规律提供了参考。
Objective
2
The finite element model under symmetric (friction disc)-antisymmetric (steel disc) was established to investigate the thermoelastic instability (TEI) and perturbation field distribution of multi-layer material friction pairs
which was based on the Galerkin method.
Methods
2
The radial distribution of critical speed and perturbation growth rate variation were obtained through coordinate transformation and Matlab numerical model analysis. A transient perturbation field calculation model for sliding surfaces was proposed based on the perturbation method and finite element model
and the distribution of temperature and pressure perturbation field on the sliding surface was obtained.
Results
2
The results indicate that the wave number corresponding to the minimum critical speed is the main characteristic wave number at which the perturbation growth rate increases the fastest. Thermoelastic instability first occurs at the outer diameter of the friction pair
and then gradually expands towards the inner diameter as the angular speed increases. The temperature and pressure perturbation fields are periodically distributed along the circumference of the friction pair
but the amplitude of perturbation at the outer diameter side is higher than that at the inner diameter side due to the difference in radial distribution of the linear speed. The amplitude of perturbation will rapidly increase with the relative sliding time due to the exponential growth effect when the relative sliding speed exceeds the critical speed. The results provide a basis for further research on the formation mechanism of hot spots and the distribution of temperature and pressure fields.
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