基于分布式光纤测温的离合器摩擦表面温度场测量

离合器在工作过程中的摩擦表面温升是离合器传递扭矩的直接影响因素，研究离合器温升情况对于改善离合器控制和优化离合器设计都有着重要意义。但摩擦片工作表面封闭，表面温度往往难以准确测量，为解决离合器温度高精度测量的问题，使用国际上发展迅速的最新型分布式光纤传感技术，在设计的干式离合器摩擦特性测试台架上进行了测量试验。试验结果表明：与传统的热电偶插入式测量相比，分布式光纤测温能够得到离合器摩擦接触面的温度沿半径方向上的温度分布，为离合器表面温度场分析提供数据支持；同时，光纤测温能够实现在离合器系统内的各个部件的温度测温。通过对不同半径、不同工况、不同部件的温度变化情况的测量结果分析，离合器摩擦接触面的温度分布与半径有关，通常呈现半径越大温升越显著的特点；在单次接合分离的过程中，离合器摩擦片的2个摩擦接触表面的温升情况并不相同，靠近飞轮盘一侧的温度变化速率比靠近压盘一侧的要快。

Temperature Field Measurement of Friction Surface of a Dry Clutch Based on Distributed Fiber-optic Temperature Measurements

An increase in the surface temperature of a clutch during engaging has a direct effect on the clutch-transmitted torque. Hence, studying the rise in clutch temperature is of great significance for improving clutch control and optimizing clutch design. However, the contacting surface of a friction lining is generally closed and the surface temperature is often difficult to measure accurately. To understand the high accuracy measurement of the clutch temperature, the latest internationally developed distributed optical fiber sensing technology was utilized to perform measurement tests on a dry clutch friction characteristic test rig that is designed in this study. The experimental results confirmed that compared with a traditional thermocouple measurement, the distributed optical fiber temperature measurement can obtain the temperature distribution along the radial direction of the frictional contact surface of the clutch and provide data for temperature field analysis of the clutch surface. Furthermore, an optical fiber measurement measures the temperature of various components within the clutch system. The measurement results of temperature changes for different radii, working conditions, and components confirm that the temperature distribution of the frictional contact surface of the clutch increases with an increase in the radius. Moreover, during a single engagement separation, the temperature rise of the two friction contact surfaces of the clutch friction plate differs, and the rate of temperature change of the side near the flywheel is higher than that of the pressure plate.