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强电磁脉冲下柴油发动机系统薄弱环节识别

刘恬诗 赵昱 祝挺 孙铁刚 武艺 孙晓颖

刘恬诗, 赵昱, 祝挺, 等 . 强电磁脉冲下柴油发动机系统薄弱环节识别[J]. 北京航空航天大学学报, 2020, 46(3): 624-633. doi: 10.13700/j.bh.1001-5965.2019.0268
引用本文: 刘恬诗, 赵昱, 祝挺, 等 . 强电磁脉冲下柴油发动机系统薄弱环节识别[J]. 北京航空航天大学学报, 2020, 46(3): 624-633. doi: 10.13700/j.bh.1001-5965.2019.0268
LIU Tianshi, ZHAO Yu, ZHU Ting, et al. Weak links identification of diesel engine system under strong electromagnetic pulse[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(3): 624-633. doi: 10.13700/j.bh.1001-5965.2019.0268(in Chinese)
Citation: LIU Tianshi, ZHAO Yu, ZHU Ting, et al. Weak links identification of diesel engine system under strong electromagnetic pulse[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(3): 624-633. doi: 10.13700/j.bh.1001-5965.2019.0268(in Chinese)

强电磁脉冲下柴油发动机系统薄弱环节识别

doi: 10.13700/j.bh.1001-5965.2019.0268
基金项目: 

装备预先研究项目 30105030302

详细信息
    作者简介:

    刘恬诗  女, 硕士研究生。主要研究方向:汽车电磁兼容

    赵昱  女, 博士, 副教授。主要研究方向:汽车电磁兼容

    通讯作者:

    赵昱, E-mail: yzhao@jlu.edu.cn

  • 中图分类号: O441.4

Weak links identification of diesel engine system under strong electromagnetic pulse

Funds: 

Equipment Pre-research Project 30105030302

More Information
  • 摘要:

    为识别强电磁脉冲环境下柴油发动机系统的薄弱环节,提出了一种加权故障树和分层贝叶斯网络相结合的柴油发动机系统薄弱环节识别方法。该方法综合考虑同层单元失效的相关性,加权故障树的局部应用解决了部分条件转移概率表不易获取问题。运用贝叶斯网络双向推理功能,首先,通过柴油发动机辐照试验和电磁仿真软件获得的各部件敏感度阈值及电磁应力数据,计算出强电磁脉冲下部件级到系统级的先验失效概率;然后,依据贝叶斯概率公式计算在发动机失效条件下各部件故障的后验概率,并排序以识别其薄弱环节,为电磁防护方案的设计提供参考和建议。以宽带高功率微波(WBHPM)辐照为例,说明了柴油发动机系统分层贝叶斯网络故障模型参数获取与概率计算过程。结果表明:执行器和凸轮轴位置传感器、曲轴位置传感器既为柴油发动机系统的重要部件,也为较薄弱环节,是需要重点防护的对象。

     

  • 图 1  柴油发动机电控结构原理图

    Figure 1.  Schematic diagram of electronic control structure of diesel engine

    图 2  柴油发动机薄弱环节识别流程图

    Figure 2.  Identification flowchart of weak links of diesel engine

    图 3  柴油发动机系统分层贝叶斯网络故障模型

    Figure 3.  Diesel engine system hierarchical Bayesian network fault model

    图 4  柴油发动机系统分层贝叶斯网络故障精简模型

    Figure 4.  Modified diesel engine system hierarchical Bayesian network fault model

    图 5  WBHPM辐照下的车辆线缆

    Figure 5.  Car cable illuminated by WBHPM

    图 6  WBHPM时、频域波形

    Figure 6.  Time and frequency domain waveforms for WBHPM

    图 7  CAN总线监控系统示意图

    Figure 7.  Schematic diagram of CAN bus monitoring system

    图 8  试验现场布置

    Figure 8.  Experimental site arrangement

    图 10  事件关系

    Figure 10.  Relationship between events

    表  1  部件敏感度阈值及失效概率

    Table  1.   Component sensitivity threshold and failure probability

    部件 μb/V σb/V Pc Pt P(C)
    曲轴位置传感器 149.55 2.18 0.7408 0.7719 0.5718
    凸轮轴位置传感器 152.76 3.42 0.7261 0.7712 0.5600
    油轨压力传感器 157.18 3.92 0.7025 0.7209 0.5064
    加速踏板位置传感器 156.63 1.29 0.7092 0.7210 0.5113
    冷却液温度传感器 193.01 6.61 0.5232 0.6290 0.3290
    进气温度压力传感器 179.22 4.68 0.5969 0.6693 0.3995
    大气压力传感器 170.59 4.41 0.6068 0.6931 0.4206
    燃油计量阀 254.01 2.67 0.2211 0.2552 0.5025
    喷油器 228.26 2.18 0.3713 0.3376 0.5427
    下载: 导出CSV

    表  2  层次分析法1~9标度的含义

    Table  2.   Meaning of scale 1-9 in analytic hierarchy process

    标度 因素i与因素j比值的含义
    1 两者的重要性相同
    3 ij稍重要
    5 ij明显重要
    7 ij强烈重要
    9 ij极端重要
    2,4,6,8 上述相邻比值重要性的中间值
    倒数 ij比值
    下载: 导出CSV

    表  3  一致性检验对照

    Table  3.   Consistency check comparison

    n RI
    1 0
    2 0
    3 0.515
    4 0.893
    5 1.119
    6 1.249
    7 1.345
    8 1.42
    9 1.462
    10 1.487
    下载: 导出CSV

    表  4  柴油发动机系统节点条件转移概率

    Table  4.   Nodal conditional transfer probability of diesel engine system

    CPT 条件转移概率公式 概率值
    m=0 m=1
    CPT1 P(V|S1=0,S2=0) 1 0
    其他 0 1
    CPT2 P(S1=m|C1.1=0,C1.3=0) 1 0
    P(S1=m|C1.1=1,C1.3=0) 0.2 0.8
    其他 0 1
    CPT3 P(S2=m|S1=0, C2.1=0,C2.3=0) 1 0
    P(S2=m|S1=0, C2.1=1,C2.3=0) 0.2 0.8
    其他 0 1
    CPT4/5 P(Ci.3=m|Ci.1=0) 1 0
    P(Ci.3=m|Ci.1=1) 0.2 0.8
    注:柴油发动机各单元工作状态可分为正常和失效两种情况,m=0表示正常工作,m=1表示失效状态;CPT表示贝叶斯网络各节点条件转移概率。
    下载: 导出CSV

    表  5  各部件后验概率

    Table  5.   Posterior probability of various components

    部件 后验概率
    曲轴位置传感器 P(C1.1.1|V)=0.5089
    凸轮轴位置传感器 P(C1.1.2|V)=0.4984
    油轨压力传感器 P(C1.1.3|V)=0.0845
    燃油计量阀 P(C1.3|V)=0.6163
    加速踏板位置传感器 P(C2.1.3|V)=0.1308
    冷却液温度传感器 P(C2.1.4|V)=0.0280
    进气温度压力传感器 P(C2.1.5|V)=0.0341
    大气压力传感器 P(C2.1.6|V)=0.0154
    喷油器 P(C2.3|V)=0.6656
    下载: 导出CSV
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  • 收稿日期:  2019-05-31
  • 录用日期:  2019-09-20
  • 刊出日期:  2020-03-20

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