涡轴发动机监视参数选择与诊断方法研究

介绍了涡轴发动机性能参数与监测参数选取的依据和方法 ,建立了利用故障因子概念诊断发动机故障的数学模型 ,给出了亚定型故障诊断方程组的解法及其发动机健康状况判定依据和故障诊断有效性的评价指标。运用发动机的实际无故障数据和模拟故障数据进行了仿真。结果表明 :建立的诊断模型可信 ;选取不同的测量参数可诊断不同的发动机故障 ;减少系统测量误差可以提高诊断的有效性。该系统对在役涡轴发动机的健康监视具有实用性 ,对其它发动机具有参考价值。

Study of Selecting Parameters and Fault Diagnosis for Turboshaft

A method about how to select performance parameters and monitoring parameters for fault diagnosis of turbo shaft is introduced in the paper.A means to resolve the non static fault equation is proposed.This approach is achieved due to less numbers of monitoring parameters than that of performance parameters during developing the mathematical model of fault diagnosis by introducing fault factors.The similar degree of maximum probability solutions which is the index for judging effectiveness of engine fault diagnosis after diagnosing engine health condition with given rules is given.The fault equation is separately verified either with non fault data of engine or with simulating single fault and combination of two faults.It shows that the developed fault diagnosis equation is creditable.Conclusions have been obtained that different faults can be separately diagnosed by means of selecting many adequate monitoring parameters and the effective degree of diagnosis effects can be increased by decreasing measured errors of parameters.The diagnosis system has practical value for monitoring health condition of turbo shaft on active duty and has reference usages for other engines.