基于无线温度监测的内燃机连杆轴瓦故障诊断技术研究

针对内燃机连杆轴瓦故障频发且监测手段有限的技术难点，提出了基于无线温度监测的连杆轴瓦磨损类故障诊断方法。通过分析连杆轴瓦与轴径相对运动时的摩擦力学关系，在考虑润滑的前提下推导出轴瓦温升计算方程，作为基于温度监测的轴瓦故障诊断方法的理论依据；以TBD234V12型柴油机为对象，搭建连杆轴瓦故障模拟实验台模拟轴瓦磨损故障，并配置无线测温系统捕捉异常温度信号，对比正常情况下的温度信号可知，磨损的连杆轴瓦表面温度相比正常轴瓦温度有明显上升。理论和模拟实验结果表明，基于无线温度监测的内燃机连杆轴瓦故障诊断方法具有较高实用价值。

Fault diagnosis of the connecting rod bush of internal combustion engines based on wireless temperature monitoring

In the light of the technical difficulties arising from the frequent failures of engine connecting rod bearing bushes and limitations in existing monitoring methods, a fault diagnosis method for connecting rod bearing bushes based on wireless temperature monitoring is proposed. By establishing a friction mathematical model of a connecting rod bearing bush and a crankpin, the equation for the bearing temperature rise has been derived under the premise of sufficient lubrication, which provides a theoretical basis for a diagnosis method based on temperature monitoring. An engine connecting rod bearing fault simulation test bench was built with a TBD234V12 diesel engine to simulate the bush wear failure tests, and a new wireless temperature monitoring system was equipped to capture the abnormal temperature signals. Compared with the normal temperature signal, the surface temperature of the worn connecting rod bearing bush has a significantly elevated temperature. The theoretical and experimental results show that our fault diagnosis method for a connecting rod bearing based on wireless temperature monitoring has high practicability.