基于综合指标多阶段相似的发动机寿命预测

doi:10.12305/j.issn.1001-506X.2021.05.33

Abstract

Abstract:

Aiming at the problem that the life cycle data of aeroengine is not sensitive to performance degradation, a multi-stage similarity life prediction method based on a comprehensive index is proposed. Firstly, the parameter variation scale, the parameter initial value difference, and the parameter value difference at failure are utilized to screen the multiple sensor parameters, and the parameters which meeting the comprehensive standards are merged into a comprehensive index. Then, the moving similarity matching method is used to select the optimal multi-model for the whole and half stage, respectively. And the results from the two-stage optimal multi-model life prediction are fused to complete the final life prediction. Finally, the data set of National Aeronautics and Space Administration(NASA) is used to verify the validity of the comprehensive index and the method, and the prediction accuracy is higher than the single-stage multi-model similarity life prediction.

Key words: comprehensive index, multi-stage, similarity, life prediction

CLC Number:

V239

Hongli ZHAO, Tianming CHEN, Nie ZHENG. Engine life prediction based on multi-stage similarity of comprehensive index[J]. Systems Engineering and Electronics, 2021, 43(5): 1430-1436.

Figures/Tables 13

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References 31

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序号	符号	具体含义
1	T2	风扇进口总温
2	T24	低压压气机出口总温
3	T30	高压压气机出口总温
4	T50	低压涡轮出口总温
5	P2	风扇进口压力
6	P15	外涵道道总压
7	P30	高压压气机出口总压
8	Nf	未修正的风扇转速
9	Nc	未修正的核心机转速
10	epr	发动机压力比
11	Ps30	高压压气机出口静压
12	Phi	燃油流量和P30比值
13	NRf	风扇修正转速
14	NRc	核心机修正转速
15	BPR	涵道比
16	farB	燃烧室油气比
17	htBleed	引气焓值
18	Nf_dmd	风扇转速设定值
19	PCNfR_dmd	风扇修正转速设定值
20	W31	高压涡轮引气量
21	W32	低压涡轮引气量

参数序号	参数名称	权重值
3	低压涡轮出口总温	0.617 8
7	高压压气机出口静压	0.229 8
13	高压涡轮引气量	0.067 5
14	低压涡轮引气量	0.084 9

运行循环	综合指标	低压涡轮出口总温
40运行循环	0.218 186	0.228 588
80运行循环	0.199 913	0.279 911
120运行循环	0.232 731	0.275 942

运行循环	RMSE	MAE
40运行循环	0.214 844	0.218 186
80运行循环	0.217 335	0.199 913
120运行循环	0.246 365	0.232 731

预测结果	多阶段多模型	多模型	单模型
MAPE/%	0.146 578	0.177 883	0.232 731
预测误差范围	[-55, 37]	[-66, 55]	[-89, 82]

Engine life prediction based on multi-stage similarity of comprehensive index

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