基于热瞬态测试方法的楔形锁紧条热阻测试

Thermal Resistance Measurement of the Wedge Lock by Using the Method of Thermal Transit Test

楔形锁紧条是LRM模块中重要的结构件及传热部件。为了测量楔形锁紧条的热阻,通过使用热瞬态测试方法,采用冷板测试夹具,利用T3ster热测试仪结合其分析软件,测量了一类锁紧条在不同锁紧力矩下的接触热阻;同时根据锁紧条热阻的串并联关系,通过实验设置,使锁紧条一侧绝热,从而分别测得了锁紧条的两个单侧热阻;实验表明模块锁紧条侧的热阻较大,其传热量只占总传热量的30%左右,所测锁紧条在20 c Nm^60 c Nm的锁紧力矩范围内,接触热阻数值变化范围在0.44K/W^0.33 K/W。实验测试结果为仿真分析中准确设定锁紧条的热阻的位置、大小提供了参考。

Wedge lock is the most important structure in line replacement module of the avionic electronic system. This paper concerned the thermal resistance of the wedge lock, the thermal resistance of one kind of wedge lock was measured by thermal transit method and got the variance of thermal resistance under the different lock torques. The proportion of each side thermal resistance had also been investigated by insert insulator in one side of the wedge lock＇ s contact surface. The measurement showed that the higher thermal resistance of the two side was the wedge lock contact surface and only 30% heat flow passed through this path, the variance of the thermal resistance from 0.44 K/W-0.33 K/W under the lock torque from 20 cNm-60 cNm. The measurement data gave the important reference about the thermal resistance distribution and the quantity in the thermal simulation setup.