液粘离合器摩擦热弹性不稳定性及其热失效机理研究

项目来源

国家自然科学基金(NSFC)

项目主持人

崔红伟

项目受资助机构

太原理工大学

立项年度

2018

立项时间

未公开

项目编号

51805351

研究期限

未知 / 未知

项目级别

国家级

受资助金额

22.00万元

学科

工程与材料科学-机械设计与制造-传动与驱动

学科代码

E-E05-E0502

基金类别

青年科学基金项目

关键词

热失效 ; 热弹性不稳定性 ; 热屈曲特性 ; 液粘离合器 ; 热失效 ; 热弹性不稳定性 ; 热屈曲特性 ; 液粘离合器

参与者

龙日升;廖瑶瑶;王其良;乔一军;刘强

参与机构

沈阳化工大学;太原理工大学;太原科技大学

项目标书摘要:液粘离合器广泛应用于大功率机械设备的调速和软启动,是节能降耗和提高设备可靠性的有效手段。然而大量的摩擦损耗经常导致摩擦副出现局部高温甚至发生烧蚀或翘曲变形等热失效问题。预先研究表明摩擦副的非均匀温度场及其热屈曲变形是导致热失效的直接原因,而控制油压动态变化和非均匀接触压力引起的摩擦副瞬态热弹性不稳定性及热失效临界条件难以预测。因此,本项目构建液粘离合器湿式摩擦副热弹性不稳定性三维有限元模型,探寻主模态下的扰动增长系数和热弹性失稳临界速度,揭示控制油压动态变化条件下的热点形成机理及温度场动态分布规律,耦合求解摩擦副的热弹性不稳定性和热屈曲特性,最后试验研究摩擦副的温度场分布和波动特性。通过本项目的研究,有望揭示摩擦副瞬态热弹性不稳定性和局部高温形成机理,阐明温度场非均匀分布和热屈曲特性耦合机制,掌握摩擦副发生热失效的判断方法,为改善液粘离合器调速和软启动性能及提高机械设备可靠性提供理论依据。

Application Abstract: Hydro-viscous clutch is widely applied to the high-power mechanical equipment for speed regulation and soft starting.It is an efficient method to energy-saving,reduce consumption,and improve the reliability of equipment.However,the local high temperature of friction pairs and even thermal failures such as ablation or warpage deformation will occur because of a large number of frictional heat dissipation.Our pre-research demonstrates that the non-uniform temperature field and thermal buckling deformation of friction pairs are the direct causes of thermal failure.But the transient thermoelastic instability and critical conditions of thermal failure which are caused by dynamic change of control pressure and non-uniform contact pressure are difficult to be predicted.Therefore,a three-dimensional finite element model for thermoelastic instability of friction pairs will be established.The perturbation growth coefficient and critical velocity in the main mode will be explored.The mechanism of hot spot and dynamic distribution of temperature field under dynamic change of control pressure will be revealed.The effect of thermoelastic instability on thermal buckling characteristics will be solved.Finally,the distribution and fluctuation characteristics of temperature will be got by experimental research.Through the project,it is expected to reveal the mechanism of transient thermoelastic instability and local high temperature,clarify the coupling mechanism of non-uniform distribution of temperature field and thermal buckling characteristics,and get the judgment method for thermal failure of friction pairs.The research results can provides the theoretical and technical support for improving the speed regulation and soft starting performance of hydro-viscous clutch and the reliability of mechanical equipment.

项目受资助省

山西省

项目结题报告(全文)

液黏离合器具有无级调速、软启动、过载保护及可靠性高等功能和优点,广泛应用于大型设备的调速以及重型刮板输送机的软启动,然而长时间滑摩过程中摩擦副大量的瞬态热积聚导致的出现局部高温甚至发生烧蚀或翘曲变形等热失效现象,而摩擦副的热失效和工作品质不稳定一直是困扰传动性能提高的瓶颈问题,性能优异的湿式摩擦副仍然需要进口,且价格昂贵,成为制约我国液黏离合器领域发展的“卡脖子”问题。因此,针对液黏离合器软启动瞬态滑摩过程,采用理论建模、数值模拟与试验研究等现代化方法,建立了基于扰动法的摩擦副热弹性不稳定性理论模型,考虑摩擦副厚度求解对称—反对称模态下的热弹性不稳定性系统矩阵,获得了临界速度、扰动增长系数、表面扰动压力场及温度场的瞬态分布及变化规律,探明了摩擦副热点形成机理及热点个数对扰动增长系数的影响规律;建立了摩擦副的三维瞬态热传导模型,利用有限元法对摩擦副非均匀温度场的分布特性进行了求解;构建了摩擦副三维瞬态热机耦合模型,探寻了热载荷和机械载荷共同作用下的应力应变变化规律;建立了三维热屈曲壳模型,揭示了热屈曲临界条件及相应的屈曲变形模态;搭建了液黏离合器摩擦副综合试验台,确定了摩擦副温度场的测试方案,验证了仿真模型的有效性。通过本项目的研究,完善了摩擦副瞬态热弹性不稳定性和热机耦合基础理论,阐明了摩擦副表面扰动压力场和非均匀温度场变化规律及热点形成机理,形成了热弹性不稳定性和热机耦合特性共同作用下的热屈曲及热失效判断方法,最终实现了工程实践应用,提高了大功率机械设备的工作品质、使用寿命和可靠性。研究过程中共发表学术论文14篇,其中SCI7篇,EI1篇,参加国际国内学术会议10余次,出版专著1部,申请发明专利2项,培养博士研究生3人,硕士研究生5人,研究成果成功应用于重型刮板输送机的可控启动装置,取得了显著的经济和社会效益。

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  • 1.Research on Load Matching Characteristics and Torque Experiment of Soft Start for Hydro-Viscous Drive

    • 关键词:
    • Conveyors;Friction;Function evaluation;Tools;Comprehensive evaluation;Condition;Evaluation function;Hydro-viscous drives;Improved radar charts;Load matching;Matching characteristic;Matchings;Scraper conveyor;Soft start
    • Li, Long;Cui, Hong-Wei;He, Bai-Yan;Zhu, Dong-Jie;Cui, Jia-Ru;Guo, Yan-Dong
    • 《9th International Conference on Fluid Power and Mechatronics, FPM 2023》
    • 2023年
    • August 18, 2023 - August 21, 2023
    • Lanzhou, China
    • 会议

    In order to study the load matching characteristics of the hydro-viscous drive soft start of scraper conveyor under different working conditions, a mathematical model of load torque, hydraulic viscous clutch bearing capacity, and hydro-viscous drive torque are established, the influence of different load starting speed on the soft start characteristics of scraper conveyor are revealed. Based on the improved radar chart method, the matching evaluation system consisting of matching evaluation indexes and evaluation functions is established, and the matching schemes of four starting speeds under different working conditions are quantitatively evaluated. The results show that as the load increases, the matching effect between S-type start and sinusoidal start with hydro-viscous drive is better. Simultaneously, a torque testing platform for hydro-viscous drive is established, the torque and friction characteristics of the friction pair of the controllable starting device are analyzed, and the control characteristics of different starting target speeds are studied. Through experimental research, it can be concluded that under heavy load conditions, the speed curves of S-type start and sinusoidal start have good compliance with the theoretical speed, short response time, and quickly reach a stable state. Under light load conditions, the torque required by the load is small, and the clutch fully meets the system torque requirements, and the matching effect of using linear start and parabolic start is better. By reasonably controlling the starting speed of the load and using the comprehensive evaluation function determined by the improved radar chart evaluation method, the advantages and disadvantages of the soft start matching scheme can be accurately quantified. The research results provide a theoretical basis for the optimal control scheme of the soft start of the scraper conveyor under different working conditions. © 2023 IEEE.

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