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中南大学学报(自然科学版)

Journal of Central South University

第40卷    第2期    总第186期    2009年4月

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文章编号:1672-7207(2009)02-0436-05
摩擦衬垫动态热物性能及其对瞬态温度场的影响
彭玉兴,朱真才,陈国安,瞿 超

(中国矿业大学 机电工程学院,江苏 徐州,221116)

摘 要: 为了获得GM-3和K25这2种广泛应用摩擦衬垫的动态热物性能及其因与钢丝绳滑动摩擦而形成的温度场,采用闪光导热仪对其进行热分析实验。研究结果表明:K25热物性能参数比GM-3的低;随着温度升高,衬垫比热容迅速增大,热扩散系数呈指数规律降低,导热系数先缓慢上升后稳定不变。针对摩擦提升超载滑动过程,基于热传导理论,采用积分变换法求解,得到衬垫瞬态温度场模型;当考虑动态热物性能参数时,衬垫温升缓慢且达到热分解温度时临界速度较高;用静态热物性能参数计算温度所存在的误差随相对滑速的增大而增大,随圆心角的增大而减小,且沿径向逐渐降低,因此,由于温度的变化,采用静态热物性能参数求得的摩擦温度是不可靠的,只有基于动态热物性能参数所获得的衬垫瞬态温度场才是客观、有效的。

 

关键词: 衬垫;动态热物性能;瞬态温度场;摩擦

Dynamic thermophysical properties of friction lining and their effect on transient temperature field
PENG Yu-xing, ZHU Zhen-cai, CHEN Guo-an, QU Chao

School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China

Abstract:In order to obtain thermophysical properties of widely used friction linings (GM-3 and K25) and their temperature field formed sliding friction with wire rope, thermo-analysis experiments were conducted on a light-flash heat conductivity apparatus. The results show that K25 has lower values of thermophysical properties than GM-3; the specific heat capacity increases rapidly with temperature, the thermal diffusivity decreases exponentially with temperature, and the thermal conductivity increases gradually at first and then keeps stable. Aiming at the sliding condition because of overloading, the transient temperature field is deduced by adopting integral-transform method and based on heat conduction theory. With the consideration of dynamic thermophysical properties, the temperature rises slowly and the critical speed corresponding to the thermal decomposition temperature is higher, and the error of temperature calculated with static thermophysical properties increases with the sliding speed, and decreases with the central angle and the radius. Therefore, due to the change of temperature, friction temperature data obtained by adopting static thermophysical properties is unreliable, and the transient temperature field obtained only by utilizing dynamic thermophysical properties is objective and effective.

 

Key words: lining; dynamic thermophysical properties; transient temperature field; friction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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