航空发动机异型推力轴承轴向力测试方法

某型航空发动机推力轴承外环与鼠笼弹支集成一体式,为满足该轴承轴向力测试要求,提出了一种新型轴向力测试改装设计和双向轴向力测试方法,给出了轴向力测试改装原则、等弯矩测力环结构设计方法及力学模型、强度计算对比分析、贴片引线设计、测试结果分析,并与现场测试结果进行了对比。理论计算与现场标定试验结果误差小于5%;现场试车中,双向测力环同步准确判断出轴向力换向转捩点,由此验证提出的轴向力测试方法具有很高的工程应用价值。

Measurement method for axial force of aero-engine special-shaped thrust bearing

Thrust bearings of an aero-engine integrate outer ring of bearing and squirrel-cage as one part. For this special-shaped bearing, a new method for thrust bearing structure modification design and measurement method of bidirectional axial force was given. The modification principle of axial force measurement, equal bending moment structural design idea, structural mechanical model, strength calculation contrast analysis, strain gauge and full-bridge leading wire adhesion were introduced, and test result analysis of force-measuring ring was made. Results proved that the error between theoretical calculations and calibration test was less than 5%. In the field test run, bidirectional force-measuring rings could accurately identify the turning point for direction change of axial force simultaneously. This means the proposed axial force measurement method based on force-measuring ring has high value of engineering practicability.