飞机PHM系统故障诊断能力外场验证模型

发布时间：2018-01-19 03:32

本文关键词： 故障诊断健康管理贝叶斯测试性外场验证　出处：《空军工程大学学报(自然科学版)》2016年03期 　论文类型：期刊论文

【摘要】：针对目前先进飞机的预测与健康管理系统(PHM)投入使用后尚缺乏系统的外场验证和评价技术手段,提出了基于先验信息的PHM诊断能力外场评估和验证方法。首先利用飞机研制、试验期间PHM系统积累的各LRU(外场可更换单元)的诊断信息,确定LRU和系统的诊断能力指标先验估计值,再利用外场数据对先验分布进行修正,形成后验分布,最后利用后验分布得到系统/分系统的PHM诊断能力参数后验估计值。通过以典型测试性参数以故障检测率和故障隔离率进行实例分析,得到了不同置信度下故障检测率和故障隔离率的置信下限。估算结果表明该方法科学合理,实用性较强,能够满足小样本条件下外场评估的工程实际需要。
[Abstract]:After the advanced aircraft prediction and health management system (PHM) is put into use, there is still a lack of systematic field verification and evaluation technology. An outfield evaluation and verification method of PHM diagnostic capability based on prior information is proposed. Firstly, the diagnostic information of each LRUs (field replaceable unit) accumulated by PHM system during the test period is used in the development of aircraft. A priori estimate of the diagnostic capability index of LRU and the system is determined, and the posterior distribution is formed by modifying the prior distribution with the field data. Finally, the posteriori distribution is used to obtain the posterior estimation of the PHM diagnostic capability parameters of the system / subsystem. A case study is carried out by taking the typical testability parameters as the fault detection rate and the fault isolation rate. The lower confidence limits of fault detection rate and fault isolation rate under different confidence levels are obtained. The estimated results show that the method is scientific and practical and can meet the practical engineering needs of field evaluation under small sample conditions.
【作者单位】：空军工程大学航空航天工程学院;空军装备研究院;
【基金】：国家自然科学基金(71501185)
【分类号】：V267
【正文快照】： 引用格式:郭基联,邵帅,虞健飞.飞机PHM系统故障诊断能力外场验证模型[J].空军工程大学学报:自然科学版,2016,17(3):1?5.GUOJilian,SHAO Shuai,YU Jianfei.Research on Field Verify Model of Fault Diagnosis Ability in Aircraft PHM System[J].Journal of Air ForceEngineer

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