航发主轴承地面寿命加速等效试验研究

AN EQUIVALENT ACCELERATION LIFE TEST TECHNIQUE OF MAIN AEROENGINE BEARING

介绍了针对航空轴承小批量特点，运用寿命加速原理导出了适当样本数、考核时间及置信度之间的关系，并用某桨型发动机主轴承作为试件，在轴承试验器上进行８套试件每套１１０小时强化试验研究。试验中采用３种测试手段进行综合的失效监控；对试件与样品进行５项内容的等效性检测与对比分析。结果表明其等效性和加速系数（９．１）与置信度（８９．７％）均令人满意。为航空部门长期尚未解决的长寿命发动机主轴承定、延寿及轴承产品鉴定验收环节提供了重要方法。

A relation is deduced among the three parameters:number of tested samples、operation time and confidence coefficient.2 52 times the normal load was applied to each sample and the test lasted more than 110 hours.After a given test time the tested samples were checked up with the bearings which had worked for about 1000 hours in the aeroengine in respect of the features of rolling raceway,microhardness,surface roughness、metallographic structure and base hardness,etc.It is shown that the equivalence of those bearing samples is quite good.The data processing of the comparative tests indicates that the acceleration coefficient is 9 1 and the confidence coefficient is 89 7%.So it is believed that the research provides a practicable and reasonable method for life determination and life prolongation of the long life bearings on the test bed,and for acceptance tests of aeroengine bearings.