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The identification of aviation accident risk factors through the system-theoretic process analysis(STPA) method is a qualitative analysis process that does not allow for a quantitative assessment of the extent to which each factor contributes to an accident. To address the above problem, a qualitative and quantitative analysis method combining STPA and Bayesian network (BN) was proposed. Taking the JetBlue A320 aircraft flap accident as an example, the control structure model of the flap control system was constructed by STPA method, and the potential unsafe control behaviors and related causal scenarios were analyzed comprehensively. Then, the results of STPA qualitative analysis were transformed into a Bayesian network model that could be quantitatively analyzed, so as to identify the internal interaction logic and the highly influential factors in the accident, and put forward comprehensive safety recommendations. The analysis results show that the main factor leading to the accident is the failure of hydraulic source, while the failure of power transmission unit (PTU) and the leakage of hydraulic line are the main causes of hydraulic source failure, with a critical importance of 0.688 and 0.299, respectively.

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通过系统理论过程分析(system-theoretic process analysis, STPA)方法识别航空事故危险因素,属于定性分析过程,无法定量地评估各因素对事故的影响程度。针对上述问题,提出STPA与贝叶斯网络(Bayesian network, BN)结合的定性与定量分析方法。以捷蓝航空A320飞机襟翼事故为例,通过STPA方法构建了襟翼控制系统的控制结构模型并全面地分析了潜在的不安全控制行为及相关致因场景。随后将STPA定性分析结果转化为可定量分析的贝叶斯网络模型,从而识别出事故中的内部交互逻辑以及影响度较高的致因因素,提出全面的安全性建议。分析结果表明:导致事故的主要因素为液压源故障,而动力传输组件(power transmission unit, PTU)故障和液压管路泄漏是导致液压源失效的主要原因,关键重要度分别为0.688和0.299。

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孙晓哲(1983—),女,汉族,河北石家庄人,博士,副教授。研究方向:民用飞机飞控作动系统容错控制、飞控系统架构安全性设计与评估。E-mail:

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孙晓哲(1983—),女,汉族,河北石家庄人,博士,副教授。研究方向:民用飞机飞控作动系统容错控制、飞控系统架构安全性设计与评估。E-mail:

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孙晓哲(1983—),女,汉族,河北石家庄人,博士,副教授。研究方向:民用飞机飞控作动系统容错控制、飞控系统架构安全性设计与评估。E-mail:

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向下箭头指示可施加的控制指令;向上箭头指示可由控制器监控并做出决策的信息和反馈

, figureFileSmall=opSEuriEzI7dhp8mFH1kxA==, figureFileBig=Lt1zWppKvboDezc1oaLAVQ==, tableContent=null), ArticleFig(id=1261377065203450597, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Fig.3, caption=Example of a simple Bayesian network, figureFileSmall=3C9kBy5ycc1iNIIrSNwtrQ==, figureFileBig=4kuZ7QE1prwtu0TuaNu5Og==, tableContent=null), ArticleFig(id=1261377065463497449, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=图3, caption=简单贝叶斯网络示例, figureFileSmall=3C9kBy5ycc1iNIIrSNwtrQ==, figureFileBig=4kuZ7QE1prwtu0TuaNu5Og==, tableContent=null), ArticleFig(id=1261377065891316464, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Fig.4, caption=Overall flow of the STPA-Bayes method, figureFileSmall=LLcAXDD4eGxIRBpj6GmEsw==, figureFileBig=mvC2DYAj86joeV+QRKK07A==, tableContent=null), ArticleFig(id=1261377066373661432, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=图4, caption=STPA-Bayes整体流程, figureFileSmall=LLcAXDD4eGxIRBpj6GmEsw==, figureFileBig=mvC2DYAj86joeV+QRKK07A==, tableContent=null), ArticleFig(id=1261377066767926015, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Fig.5, caption=Bayesian network node dependencies, figureFileSmall=ZW/bkTtH8AHvRFeghWVVyA==, figureFileBig=B7syBT1nHY3ZWLLYUV2WkA==, tableContent=null), ArticleFig(id=1261377067090887428, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=图5, caption=贝叶斯网络节点依赖关系

0为正常;1为故障

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襟翼控制杆(flap control lever, FCL);襟翼电子控制单元(flap electronics control unit, FECU);液压源(hydraulic source, HS);主控阀(main control valve, MCV);液压马达(hydraulic motor, HM);传动机构(transimission gear, TG);位置传感器(position sensor, PS);倾斜传感器(inclination sensor, IS);信号处理电路(signal processing circuitry, SPC);飞行显示系统(flight display system, FDS)

, figureFileSmall=4JP5lGtzBhinPidsnbcAjg==, figureFileBig=S/cUpjvGhZgy3yuGv/jmuA==, tableContent=null), ArticleFig(id=1261377069536166686, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Fig.7, caption=Bayesian network structure model ofUCA-2.1, figureFileSmall=xiMoLJRWvySWjrnqa7A1cA==, figureFileBig=HWpaBGFVQrZn5AP0sfmdPQ==, tableContent=null), ArticleFig(id=1261377069817185061, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=图7, caption=UCA-2.1贝叶斯网络结构模型, figureFileSmall=xiMoLJRWvySWjrnqa7A1cA==, figureFileBig=HWpaBGFVQrZn5AP0sfmdPQ==, tableContent=null), ArticleFig(id=1261377069984957224, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Fig.8, caption=Posterior probability of each potential causal scenario under UCA-2.1 condition, figureFileSmall=NpJAb+uZj1wadN+VBxUp8Q==, figureFileBig=PMAoQVWJUYqhRhxOjAqzrw==, tableContent=null), ArticleFig(id=1261377070341473072, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=图8, caption=UCA-2.1发生条件下各致因场景后验概率

状态0代表事件未发生;状态1代表事件发生

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黄色液压源(yellow hydraulic source, YHS);绿色液压源(green hydraulic source, GHS);动力传输组件(power transmission unit, PTU);液压泵(hydraulic pump, HP);液压管路(hydraulic line, HL)

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UCA of the flap system during the approach process

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控制行为 提供错误的控制行为UCA-1 未提供控制行为UCA-2 过早/过晚提供此
控制行为UCA-3
控制操作的时间过
长或停止过早UCA-4
编号 详情 编号 详情 编号 详情 编号 详情
进近过程 UCA-1.1 飞行员正确操作后,襟翼偏转角度或位置错误,并未反馈告警信息 UCA-2.1 飞行员正确操作后,襟翼未发生偏转,并反馈告警信息 UCA-3.1 飞行员正确操作后,襟翼偏转延迟
UCA-1.2 飞行员正确操作后,襟翼偏转角度或位置正确,反馈告警信息 UCA-2.2 飞行员正确操作后,襟翼未发生偏转,并未反馈告警信息 UCA-3.2 襟翼偏转角度或位置错误,告警信息反馈延迟
), ArticleFig(id=1261377074942624623, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表1, caption=

进近过程襟翼系统UCA

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控制行为 提供错误的控制行为UCA-1 未提供控制行为UCA-2 过早/过晚提供此
控制行为UCA-3
控制操作的时间过
长或停止过早UCA-4
编号 详情 编号 详情 编号 详情 编号 详情
进近过程 UCA-1.1 飞行员正确操作后,襟翼偏转角度或位置错误,并未反馈告警信息 UCA-2.1 飞行员正确操作后,襟翼未发生偏转,并反馈告警信息 UCA-3.1 飞行员正确操作后,襟翼偏转延迟
UCA-1.2 飞行员正确操作后,襟翼偏转角度或位置正确,反馈告警信息 UCA-2.2 飞行员正确操作后,襟翼未发生偏转,并未反馈告警信息 UCA-3.2 襟翼偏转角度或位置错误,告警信息反馈延迟
), ArticleFig(id=1261377075131368309, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Table 2, caption=

Potential cause scenarios corresponding to UCA-2.1

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编号 潜在致因场景内容
Pcs-1 襟翼控制手柄FCL故障,导致输出错误的控制命令/未能输出控制命令
Pcs-2 襟翼电子控制单元FECU故障,导致输出错误的控制命令/未能输出控制命令
Pcs-3 襟翼控制功能故障,导致输出错误的控制指令/未输出控制指令
Pcs-4 液压源HS故障,导致执行机构接收错误的控制指令/未接受控制指令
Pcs-5 主控阀MCV故障,导致输出错误的控制命令/未输出控制命令
Pcs-6 液压马达HM故障,导致输出错误的舵面指令/未输出舵面指令
Pcs-7 传动机构TG故障,导致襟翼执行错误的舵面面指令/未执行舵面指令
Pcs-8 襟翼执行机构故障,导致襟翼执行错误的舵面指令/未执行舵面指令
Pcs-9 位置传感器PS故障,导致输出错误的位置信息/丧失位置信息
Pcs-10 倾斜传感器IS故障,导致输出错误的角度信息/丧失角度信息
Pcs-11 信号处理电路SPC故障,导致输出错误反馈信号/丧失反馈信号
Pcs-12 襟翼传感器功能故障,导致未反馈/反馈错误的状态信息
), ArticleFig(id=1261377075299140478, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表2, caption=

UCA-2.1对应的潜在致因场景

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编号 潜在致因场景内容
Pcs-1 襟翼控制手柄FCL故障,导致输出错误的控制命令/未能输出控制命令
Pcs-2 襟翼电子控制单元FECU故障,导致输出错误的控制命令/未能输出控制命令
Pcs-3 襟翼控制功能故障,导致输出错误的控制指令/未输出控制指令
Pcs-4 液压源HS故障,导致执行机构接收错误的控制指令/未接受控制指令
Pcs-5 主控阀MCV故障,导致输出错误的控制命令/未输出控制命令
Pcs-6 液压马达HM故障,导致输出错误的舵面指令/未输出舵面指令
Pcs-7 传动机构TG故障,导致襟翼执行错误的舵面面指令/未执行舵面指令
Pcs-8 襟翼执行机构故障,导致襟翼执行错误的舵面指令/未执行舵面指令
Pcs-9 位置传感器PS故障,导致输出错误的位置信息/丧失位置信息
Pcs-10 倾斜传感器IS故障,导致输出错误的角度信息/丧失角度信息
Pcs-11 信号处理电路SPC故障,导致输出错误反馈信号/丧失反馈信号
Pcs-12 襟翼传感器功能故障,导致未反馈/反馈错误的状态信息
), ArticleFig(id=1261377075420775300, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Table 3, caption=

Terminal leaf node conditional probability

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中间叶节点 终端叶节点UCA-2.1
Pcs3 Pcs8 Pcs12
1 1 1 1
1 1 0 1
1 0 1 1
0 1 1 1
0 1 0 1
0 0 1 1
1 0 0 1
0 0 0 0
), ArticleFig(id=1261377075634684812, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表3, caption=

终端叶节点条件概率

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中间叶节点 终端叶节点UCA-2.1
Pcs3 Pcs8 Pcs12
1 1 1 1
1 1 0 1
1 0 1 1
0 1 1 1
0 1 0 1
0 0 1 1
1 0 0 1
0 0 0 0
), ArticleFig(id=1261377075865371537, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Table 4, caption=

Intermediate leaf node conditional probability table(sensor part)

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Pcs9 Pcs10 Pcs11 Pcs12
1 1 1 1
1 1 0 1
1 0 1 1
0 1 1 1
0 1 0 1
0 0 1 1
1 0 0 1
0 0 0 0
), ArticleFig(id=1261377076196721562, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表4, caption=

中间叶节点条件概率(传感器部分)

, figureFileSmall=null, figureFileBig=null, tableContent=
Pcs9 Pcs10 Pcs11 Pcs12
1 1 1 1
1 1 0 1
1 0 1 1
0 1 1 1
0 1 0 1
0 0 1 1
1 0 0 1
0 0 0 0
), ArticleFig(id=1261377076481934244, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Table 5, caption=

Intermediate leaf node conditional probability table(controller part)

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Pcs1 Pcs2 Pcs3
1 1 1
1 0 1
0 1 1
0 0 0
), ArticleFig(id=1261377076586791848, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表5, caption=

中间叶节点条件概率(控制器部分)

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Pcs1 Pcs2 Pcs3
1 1 1
1 0 1
0 1 1
0 0 0
), ArticleFig(id=1261377076725203884, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Table 6, caption=

Intermediate leaf node conditional probability table(actuator part)

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Pcs4 Pcs5 Pcs6 Pcs7 Pcs8
1 1 1 1 1
1 1 1 0 1
1 1 0 1 1
1 0 1 1 1
0 1 1 1 1
1 1 0 0 1
1 0 1 0 1
1 0 0 1 1
0 1 0 1 1
0 1 1 0 1
0 0 1 1 1
1 0 0 0 1
0 1 0 0 1
0 0 1 0 1
0 0 0 1 1
0 0 0 0 0
), ArticleFig(id=1261377078478422962, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表6, caption=

中间叶节点条件概率(执行机构部分)

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Pcs4 Pcs5 Pcs6 Pcs7 Pcs8
1 1 1 1 1
1 1 1 0 1
1 1 0 1 1
1 0 1 1 1
0 1 1 1 1
1 1 0 0 1
1 0 1 0 1
1 0 0 1 1
0 1 0 1 1
0 1 1 0 1
0 0 1 1 1
1 0 0 0 1
0 1 0 0 1
0 0 1 0 1
0 0 0 1 1
0 0 0 0 0
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Prior probability of the root node

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节点名称 先验概率 节点名称 先验概率
SPC 2.0×10-8 HS 7.7×10-6
PS 1.2×10-6 HM 6.8×10-7
IS 2.0×10-6 MCV 1.6×10-6
FCL 4.9×10-7 TG 5.2×10-6
FECU 1.9×10-6
), ArticleFig(id=1261377078998516670, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表7, caption=

根节点先验概率

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节点名称 先验概率 节点名称 先验概率
SPC 2.0×10-8 HS 7.7×10-6
PS 1.2×10-6 HM 6.8×10-7
IS 2.0×10-6 MCV 1.6×10-6
FCL 4.9×10-7 TG 5.2×10-6
FECU 1.9×10-6
), ArticleFig(id=1261377079124345794, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=EN, label=Table 8, caption=

Correlated root node posterior probability

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根节点 后验概率
FCL 0.023 6
FECU 0.091 4
MCV 0.077 0
HS 0.370 0
HM 0.032 7
TG 0.250 0
), ArticleFig(id=1261377079401169867, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表8, caption=

相关根节点后验概率

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根节点 后验概率
FCL 0.023 6
FECU 0.091 4
MCV 0.077 0
HS 0.370 0
HM 0.032 7
TG 0.250 0
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Description of each state

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状态 状态说明 状态 状态说明
Safe 无故障状态 GH2 GHS中HP故障
C1 FECU功能失效 GH3 GHS中HL、HP同时故障
C2 FCL功能失效 YH1 YHS中HL故障
C3 FECU、FCL功能同时失效 YH2 YHS中HP故障
A1 MCV/功能失效 YH2 YHS中HL、HP同时故障
A2 TG功能失效 A1 IS功能失效
A3 HM功能失效 A2 PS功能失效
A4 TG、HM功能同时失效 A3 SPC功能失效
A5 MCV、HM功能同时失效 A4 PS、SPC功能同时失效
A6 MCV、TG功能同时失效 A5 IS、SPC功能同时失效
A7 MCV、TG、HM功能全部失效 A6 IS、PS功能同时失效
PTU PTU功能失效 A7 IS、PS、SPC功能全部失效
GH1 GHS中HL故障
), ArticleFig(id=1261377079929652179, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1261270367956513006, language=CN, label=表9, caption=

各状态说明

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状态 状态说明 状态 状态说明
Safe 无故障状态 GH2 GHS中HP故障
C1 FECU功能失效 GH3 GHS中HL、HP同时故障
C2 FCL功能失效 YH1 YHS中HL故障
C3 FECU、FCL功能同时失效 YH2 YHS中HP故障
A1 MCV/功能失效 YH2 YHS中HL、HP同时故障
A2 TG功能失效 A1 IS功能失效
A3 HM功能失效 A2 PS功能失效
A4 TG、HM功能同时失效 A3 SPC功能失效
A5 MCV、HM功能同时失效 A4 PS、SPC功能同时失效
A6 MCV、TG功能同时失效 A5 IS、SPC功能同时失效
A7 MCV、TG、HM功能全部失效 A6 IS、PS功能同时失效
PTU PTU功能失效 A7 IS、PS、SPC功能全部失效
GH1 GHS中HL故障
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基于STPA-Bayes模型的航空事故致因分析与风险评估
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孙晓哲 , 王家璇 , 杨建忠
科学技术与工程 | 论文·航空、航天 2025,25(20): 8714-8724
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科学技术与工程 | 论文·航空、航天 2025, 25(20): 8714-8724
基于STPA-Bayes模型的航空事故致因分析与风险评估
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孙晓哲 , 王家璇, 杨建忠
作者信息
  • 中国民航大学安全科学与工程学院, 天津 300300
  • 孙晓哲(1983—),女,汉族,河北石家庄人,博士,副教授。研究方向:民用飞机飞控作动系统容错控制、飞控系统架构安全性设计与评估。E-mail:

Cause Analysis and Risk Assessment of Aviation Safety Accidents Based on STPA-Bayes Model
Xiao-zhe SUN , Jia-xuan WANG, Jian-zhong YANG
Affiliations
  • School of Safety Science and Engineering, Civil Aviation University of China, Tianjin 300300, China
出版时间: 2025-07-18 doi: 10.12404/j.issn.1671-1815.2405472
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通过系统理论过程分析(system-theoretic process analysis, STPA)方法识别航空事故危险因素,属于定性分析过程,无法定量地评估各因素对事故的影响程度。针对上述问题,提出STPA与贝叶斯网络(Bayesian network, BN)结合的定性与定量分析方法。以捷蓝航空A320飞机襟翼事故为例,通过STPA方法构建了襟翼控制系统的控制结构模型并全面地分析了潜在的不安全控制行为及相关致因场景。随后将STPA定性分析结果转化为可定量分析的贝叶斯网络模型,从而识别出事故中的内部交互逻辑以及影响度较高的致因因素,提出全面的安全性建议。分析结果表明:导致事故的主要因素为液压源故障,而动力传输组件(power transmission unit, PTU)故障和液压管路泄漏是导致液压源失效的主要原因,关键重要度分别为0.688和0.299。

事故分析  /  系统理论过程分析(STPA)  /  贝叶斯网络(BN)  /  致因分析  /  风险评估

The identification of aviation accident risk factors through the system-theoretic process analysis(STPA) method is a qualitative analysis process that does not allow for a quantitative assessment of the extent to which each factor contributes to an accident. To address the above problem, a qualitative and quantitative analysis method combining STPA and Bayesian network (BN) was proposed. Taking the JetBlue A320 aircraft flap accident as an example, the control structure model of the flap control system was constructed by STPA method, and the potential unsafe control behaviors and related causal scenarios were analyzed comprehensively. Then, the results of STPA qualitative analysis were transformed into a Bayesian network model that could be quantitatively analyzed, so as to identify the internal interaction logic and the highly influential factors in the accident, and put forward comprehensive safety recommendations. The analysis results show that the main factor leading to the accident is the failure of hydraulic source, while the failure of power transmission unit (PTU) and the leakage of hydraulic line are the main causes of hydraulic source failure, with a critical importance of 0.688 and 0.299, respectively.

accident analysis  /  systems-theoretic process analysis(STPA)  /  Bayesian network(BN)  /  causal analysis  /  risk assessment
孙晓哲, 王家璇, 杨建忠. 基于STPA-Bayes模型的航空事故致因分析与风险评估. 科学技术与工程, 2025 , 25 (20) : 8714 -8724 . DOI: 10.12404/j.issn.1671-1815.2405472
Xiao-zhe SUN, Jia-xuan WANG, Jian-zhong YANG. Cause Analysis and Risk Assessment of Aviation Safety Accidents Based on STPA-Bayes Model[J]. Science Technology and Engineering, 2025 , 25 (20) : 8714 -8724 . DOI: 10.12404/j.issn.1671-1815.2405472
航空安全是航空行业重要的关注领域,为保障乘客和机组人员的安全,必须持续提升安全水平并减少事故发生率。航空安全事故的致因错综复杂[1],其中系统故障是事故链条中的关键环节。因此,及时识别和评估这些故障的风险是提升航空安全的关键。然而,民机系统的复杂性及其高度集成,给风险的识别和评估带来了前所未有的挑战,对安全性分析提出了更高的要求。传统的系统安全性评估方法,如故障树分析(fault tree analysis, FTA)、功能危害分析(functional hazard analysis, FHA)和失效模式及其影响分析(failure mode and effects analysis, FMEA)等,可以很好地解释系统的运作方式并将系统安全性问题转化为组件可靠性问题,并且已经在民机系统安全性研究中广泛应用[2]。但对于内部存在复杂交互关系的系统,传统方法难以进行准确建模和全面有效的分析。
系统理论过程分析(system-theoretic process analysis, STPA)是基于系统理论和控制理论的安全分析方法,该方法认为系统是由多个组成部分相互作用而成的复杂整体,这些组成部分之间存在着动态的关系和相互影响[3]。与其他安全性分析方法相比,该方法不仅能准确描述组件间的异常交互,还能全面地识别系统安全隐患,使其更适合应用于复杂系统的分析。近年来,中国在航空安全领域取得了显著进展,STPA已在中国航空安全领域被广泛应用,并取得了不错的效果。在机轮刹车系统中,STPA可以全面地识别机轮刹车系统在飞机降落过程中的不安全控制行为(unsafe control actions, UCA),从系统整体角度完成对刹车系统的风险辨识和影响分析[4]。为了防止低空无人机冲突解决过程中危险进近或事故的发生,文献[5]基于STPA识别了低空无人机冲突解决过程中的UCA,并分析产生不安全控制行为的关键致因。文献[6]应用STPA方法分析空中加油中的“软管甩鞭问题”,充分考虑了系统的非线性交互,实现了系统控制思维在空中加油安全性分析中的应用。虽然STPA可以全面分析系统存在的潜在缺陷,但缺少对系统的定量分析和概率计算,无法描述潜在致因场景对系统不安全控制行为的影响程度。
贝叶斯网络(Bayesian network, BN)基于贝叶斯定理和图论的概念,是一种用于表示变量间的依赖关系并进行概率推理的概率图模型,可以对复杂系统中的非线性关系形式化建模,捕捉变量之间的非线性依赖关系来量化分析系统,且在航空安全领域中有着多方面的应用。在风险评估方面,为降低城市物流无人机碰撞风险,文献[7]基于贝叶斯网络对无人机的碰撞风险因素进行了逆向推理、敏感性和影响强度等的分析,并根据分析结果针对性提出防控建议。为了分析民机着陆超限风险及其影响因素,文献[8]基于中国某航空公司B737-800机队飞行数据建立着陆超限风险贝叶斯网络,量化评估各飞行参数变化对着陆超限风险的影响,有效分析着陆超限事件的交互关系。文献[9]基于贝叶斯网络对电动垂直起降飞行器控制失效场景进行分析,包括失控坠地和中间场景的正向和逆向推理分析,深入理解系统内部的复杂交互机制。
为解决航空事故分析中STPA无法定量评估的问题,将STPA与贝叶斯网络方法相结合,STPA能够透彻分析系统级别的交互和依赖关系,以全面地识别复杂系统中可能存在的系统故障或错误传播路径。贝叶斯网络则可以以形式化方式将系统内部交互逻辑建模并描述出来,为STPA提供概率推断和风险评估的支持,使得安全分析结果不仅依赖于定性判断,从而更好地分析和评估系统的潜在风险,增强了分析的客观性和可信度。采用STPA-Bayes方法对航空安全事故进行研究,识别出导致事故发生的潜在致因因素,并量化评估事故风险,可为航空安全事故风险分析提供理论指导。
系统理论过程分析是一种危害分析的系统方法[10],它不仅可以系统地识别与组件故障相关的危险,还可以识别如组件交互故障、有缺陷的控制行为、人为错误、设计错误等相关的危险,从而更全面地评估系统的安全性和可靠性。分析过程如图1所示。
STPA通过创建系统的安全控制结构,详细描绘系统内部组成及其之间的控制和反馈路径,使用致因分析框架来识别致因场景,如图2所示。
贝叶斯网络是一种用图形方式表示变量之间依赖关系的模型,常用于机器学习和人工智能领域[11]。作为概率图模型的一种,贝叶斯网络利用图形化的方式清晰地展现复杂的概率关系,在其图形化模型中,节点代表变量,边则代表变量之间的概率依赖关系,通常用箭头来表达因果关系。图3为一个简单的贝叶斯网络结构,条件概率表以X5节点为例(概率表中,0为正常、1为故障)。
贝叶斯网络的主要优点是结构直观,能够清楚地呈现出变量之间的依赖关系,并且结合一些变量的观测,可以使用贝叶斯网络来推断其他变量的概率分布。
结合两者的优势,图4为STPA-Bayes方法整体流程。首先是根据事故场景建立控制结构模型,通过识别不安全控制行为和相关致因场景得到可能导致事故的原因及对应的定性安全性需求,根据转换规则建立相应的BN结构模型,最后代入条件概率表进行计算,量化评估UCA,并根据分析结果给出相应安全建议。
根据STAMP控制结构模型和通用致因因素框架(图2),可以识别系统中可能的不安全控制行为及相应的潜在致因场景。接着,根据致因场景中的系统组件、失效模式等因素构建贝叶斯网络模型。具体模型转换规则如下。
(1)所分析的不安全控制行为作为BN模型的终端叶节点。
(2)与UCA直接或间接相关的致因场景,如襟翼控制器故障、控制手柄故障等作为中间叶节点。
(3)UCA对应致因场景所涉及的所有组件/模块作为BN模型的根节点。
(4)UCA对应致因场景所涉及的所有组件/模块的故障率作为各根节点先验概率。
(5)根节点与叶节点、叶节点与叶节点之间的依赖关系,即条件概率表,如图5所示。
根据美国捷蓝航空A320事故信息建立襟翼系统控制结构模型,分析系统控制流,捕获系统的不安全控制行为,以识别出导致不安全控制行为的潜在致因场景。
2012年6月17日,美国捷蓝航空一架A320飞机在从拉斯维加斯出发后不久,飞机由于液压系统泄露,导致襟翼系统告警并失去控制。飞行员紧急处置,最终飞机实现紧急着陆,液压系统损坏,未发生人员伤亡。美国国家交通安全委员会在事故报告中给出了事故过程和原因,具体如下。
(1)事故过程。飞机从拉斯维加斯麦卡伦国际机场起飞后不久,由于绿色液压系统泄漏导致压力下降,随后动力传输组件过热并失效,导致黄色液压系统也失去压力。飞机失去两个液压系统后,襟翼无法操作,刹车和前轮转向功能受限,飞控系统切换到备用模式。机组人员选择在3 600 m的高度保持等待,燃烧燃油减轻飞机重量,并与地面控制人员、维修人员和调度人员沟通。最终,飞机在黄色液压源恢复后实现紧急着陆,没有造成人员伤亡。
(2)事故原因。绿色液压系统软管发生泄漏,导致动力传输单元长时间运行并超温失效,随后黄色液压系统压力下降,导致黄绿液压源全部失效,控制通道全部失效。此外,飞机在起飞前有一个襟翼控制通道失效,但根据美国联邦航空管理局(Federal Aviation Administration,FAA)批准的最小设备清单进行延期维护。
(1) 定义系统级事故。机组人员及乘客伤亡(记为A-1)、飞机结构完整性受损(记为A-2)和地面设施或建筑损坏(记为A-3)。
(2) 定义系统级危险。飞机在进近时速度过大(记为H-1)、飞行员失去控制飞机的能力(记为H-2)和飞机偏离或冲出跑道(记为H-3)。
(3) 安全控制结构建模。对飞机飞行过程中襟翼功能直接关联的物理部件、控制系统、机组人员以及环境因素进行分析,建立飞机降落过程中的襟翼控制系统安全控制结构模型。如图6所示,控制结构建模涉及的有控制器、液压源、执行机构、传感器、襟翼、机组人员和环境因素等。
机组人员FC是整个系统的输入端,并通过控制杆FCL对襟翼控制系统进行操作;襟翼电子控制单元FECU接收FCL的输入指令并进行处理,通过电信号将得到的控制指令传递给主控阀;主控阀MCV控制液压油的流向和压力,从而驱动液压马达;液压马达HM通过液压油在马达内部施加压力,推动马达内部的机械组件旋转,转化为机械运动,进而通过传动机构TG使得执行元件的移动转化为襟翼的角度和位置变化。位置传感器PS和倾斜传感器IS收集襟翼的位置和角度等信息,经过信号处理电路SPC处理后,反馈给襟翼电子控制单元FECU,驾驶舱的飞行显示系统FDS将飞行状态信息反馈给机组人员FC。
基于控制结构分析每个控制动作,以了解它可能导致危险的方式。根据STPA分析指导对每个控制动作考虑以下4个问题:①提供这种控制措施如何导致危险?②不提供这种控制措施如何导致危险?③过早/过晚提供此控制措施如何导致危险?④提供此控制操作的时间过长或停止过早会如何导致危险?针对捷蓝航空空客A320飞机事故,基于以上4种危险场景分析给出UCA,如表1所示。
识别出控制行为变得不安全的所有方式后,就可以识别可能导致此类不安全控制行为的场景。根据事故调查,以UCA-2.1“飞行员正确操作后,襟翼未发生偏转,并反馈告警信息”为例,根据图2所描述的通用致因因素得到以下潜在致因场景(potential causal scenario, PCS),如表2所示,展开进一步分析。
最终得到共12个关于UCA-2.1的致因场景(Pcs1~Pcs12),其中与控制器相关的致因场景有3个(Pcs1~Pcs3),与液压源有关的致因场景为Pcs4,与执行机构相关的致因场景有4个(Pcs5~Pcs8),与传感器相关的致因场景有4个(Pcs9~Pcs12)。
贝叶斯统计是一种基于贝叶斯定理的数据分析方法,其中有关统计模型中参数的可用知识会根据观测数据中的信息进行更新。假设一个贝叶斯网络包含一系列的变量(Xi,Xa,…,Xn),那么对于这个网络中任何变量Xi(i=1, 2,…,n),给定其父变量Parents(Xi)的情况下Xi的条件概率可以从网络直接获得,通过链式规则来定义,可表示为
$\mathrm{P}({X}_{1},{X}_{2},\dots,{X}_{n})=\stackrel{n}{\prod _{i=1}}\left[P\right({X}_{i}\left|\mathrm{P}\mathrm{a}\mathrm{r}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s}\left({X}_{i}\right)]\right.$
历史知识被表示为先验概率,并以似然函数的形式与观测数据相结合,以确定后验概率[12]。逆向分析表达式为
$P\left(A\right|B)=\frac{P\left(A\right)P\left(B\right|A)}{P\left(B\right)}$
式(2)中:P(A)为A的先验概率;P(A|B)为已知B发生后A的条件概率,也称为A的后验概率;P(B|A)为给定变量A的情况下,观察到证据B的概率,也称为似然;P(B)为B的先验概率,这里称为标准化常量。
通过分析发现,与UCA-2.1相关的致因场景由9个组件/模块组成:FCL、FECU、MCV、HS、HM、TG、PS、IS和SPC。根据系统的安全控制结构和BN模型转换规则,转换得到UCA-2.1的BN模型,如图7所示。
UCA-2.1向下与直接相关致因场景相连,这些节点作为导致UCA发生的直接因素,直接致因再向下与间接致因场景相连,它们共同作为中间叶节点,之间的依赖关系见条件概率,如表3~表6所示;最后,中间叶节点涉及的物理组件作为网络的根节点。
贝叶斯网络的定量分析包括预测和诊断分析[13],预测分析与故障树分析相似,基于已知根节点(基本事件)的先验概率,通过节点之间的条件概率关系来计算任意节点发生的后验概率,其中先验概率值一般来自元部件综合计算和故障数据统计。
根据2.2节所定义的进近场景中襟翼控制系统的UCA可能导致相应的事故和危险,可能导致的危险有H-1、H-2和H-3,可能导致的事故有A-1、A-2和A-3。组件故障率数据来源于文献[14-17],将先验概率值赋给相应的根节点,配置相关的先验概率表,如表7所示。
基于各根节点先验概率,通过式(1)正向推理计算,可得UCA-2.1“通告的襟翼功能丧失”发生概率为2.078 98×10-5/飞行小时。
为了探究各致因场景对UCA-2.1的影响,通过式(2)对与UCA-2.1相关的致因链做逆向推理计算,得到每一个致因场景的后验概率,如图8所示。
分析可知,导致UCA-2.1的直接致因场景按照影响程度从大到小依次为Pcs8>Pcs3>Pcs12,间接致因场景影响程度从大到小依次为:Pcs2>Pcs5>Pcs6>Pcs4>Pcs7>Pcs11>Pcs10>Pcs9>Pcs1,即襟翼执行机构和襟翼控制器的功能故障对襟翼正常工作影响最大。分析产生这种结果的原因在于:①执行机构是襟翼控制系统中将飞行员或控制器输入指令转化为襟翼实际机械运动的核心组成部分,对于襟翼的正常功能至关重要;②襟翼控制器作为枢纽,负责将飞行员的指令转换为电信号,驱动执行机构来调整襟翼的位置。因此执行机构和控制器的失效对于UCA-2.1的贡献较大,相关致因场景有着较高的后验概率。
进一步分析系统中不同组件对UCA-2.1的影响,对贡献度最高的致因场景Pcs8和Pcs3中相关联的组件进行后验概率计算并分析与先验概率之间的差异(单位:每10 000飞行小时)。相关根节点后验概率数值如表8所示,后验概率与先验概率之间的差异如图9所示。
后验概率与先验概率之间的差异越大,说明根节点对UCA-2.1的影响更大[18]。结果表明,各组件对不安全控制行为的影响排序为:HS>TG>FECU>MCV>HM>FCL,即液压源、传动机构和电控单元对襟翼正常工作影响较大。根据以上分析结果分析可知:①液压源作为执行机构的动力来源,对UCA-2.1的影响最大,概率差值为0.293;②传动机构负责将执行机构的动力转换为襟翼的物理移动,确保襟翼功能的高效执行,概率差值为0.198;③襟翼电子控制单元接受控制杆的操纵指令,以电信号形式传递给执行机构,概率差值为0.072 4。
基于以上致因场景影响度分析的结论,对影响最大的组件——液压源展开深入分析以探究事故的主要根源。根据液压源HS的工作原理建立相应的BN模型并对相关组件进行关键重要度分析。
BN模型如图10所示,液压源HS向下与黄/绿色液压源之间,黄/绿色液压源向下与液压泵、液压管路和动力传输组件之间均以“or”关系相连,即任一子节点失效,父节点功能都会受到影响。
关键重要度反映了根节点失效概率的变化程度与因其失效使得叶节点失效概率变化程度的比值,关键重要度越大,说明对相应部件采取措施时,能够大概率减少风险事件的发生,计算公式为
$\begin{array}{l}I\left({X}_{i}\right)=\left\{P\right({X}_{i}=1\left)\right[P(Y=1|{X}_{i}=1)-\\ P(Y=1|{X}_{i}=0\left)\right]\left\}\right[P{(Y=1)]}^{-1}\end{array}$
根据式(3)计算分别得到各组件对于液压源HS[图11(a)]和黄色液压源YHS[图11(b)]的关键重要度,如图11所示。
计算后的关键重要度数值在0~1,数值越大说明该组件故障对(黄色)液压源故障的贡献程度越大。如图11所示,各组件对液压源HS的关键重要度从高到低排序为:PTU>HL1=HL2>HP1=HP2,对黄色液压源YHS的关键重要度从高到低排序为:PTU>HL1=HL2>HP2>HP1,即动力传输组件和液压管路的重要度较高。
图11(a)可知,动力传输组件PTU是液压系统中至关重要的组件,负责在黄绿液压系统之间平衡液压压力,确保系统的正常运作,对于液压系源HS的关键重要度高达0.688;液压管路HL1和HL2是飞机液压系统的“血管”,负责将液压油从泵输送到飞机各个液压设备,对液压源HS的关键重要度为0.299。
图11(b)可知,黄色液压管路HL2和绿色液压管路HL1对黄色液压源具有同等影响(重要度均为0.354);绿色管路HL1的泄露会导致黄色液压源的失效的原因是在绿色液压源压力较低的情况下交互组件“动力传输组件PTU”超负荷工作导致故障,而PTU的失效进而导致黄色液压源内部压力失衡(PTU对黄色液压源的重要度为0.815)。
为了确保STPA-Bayes的概率计算的准确性,将其与马尔可夫过程(Markov process,MP)的分析结果进行比较,表9为各个状态的解释。
表9可知,系统包括初始无故障状态在内共有25个状态,通过马尔可夫链对襟翼控制系统相关组件进行建模并计算,得到襟翼功能丧失的状态概率为2.079 002 19×10-5/FH,Markov链模型如图12所示。
将两种方法的计算结果进行对比,二者的误差值为2.2×10-10,表明所采用的STPA-Bayes模型从转换到定量计算的过程和结果的正确性,能够有效对UCA进行定量分析。
通过上述STPA-Bayes的致因分析和风险评估方法对襟翼控制系统安全性进行审视,从系统和因果角度考虑可能的故障及故障间的交互特性,分析给出以下建议。
(1)在致因场景影响度分析中,液压源HS、传动机构TG和电控单元FECU具有较高的概率差值(分别为0.293、0.198和0.072 4)。因此建议:①引入冗余备份,通过增设液压系统和备用液压管路,提升系统对故障的恢复能力,减少单点故障带来的风险;②加强维护与检查,定期进行传动机构TG的维护检查,提前发现潜在问题并采取措施;③优化控制链路,增加电控单元FECU的控制通道并采用信号表决机制,不仅增强控制系统的鲁棒性,还能容错处理错误的输入数据,减少连锁反应带来的一系列风险。
(2)在组件重要度分析中,PTU都有着较高的重要度(分别为0.688和0.815),并且PTU的失效也会导致黄绿液压源之间产生影响(HL1对YHS的重要度为0.354)。因此建议:①优化控制策略,改进动力传输组件PTU的控制逻辑,使其能够在长时间超负荷工作中自动停止,防止过热而导致失效;②增加告警与监控,实时监控PTU的工作状态,监测其温度和压力,确保它们在正常范围内,并在超出阈值时及时发出告警信号。
NTSB针对这起事故提出以下安全建议。
(1)A-13-019。要求FAA重审其规定,以确保飞行员在起飞后能及时接收到动力传输装置(PTU)激活的警告,从而有效应对液压系统故障。
(2)A-13-020。建议FAA确保航空公司能够快速响应并执行服务通告,以进行必要的维护,防止未来的故障。
(3)A-13-021。要求空中客车公司审查并改进其液压系统设计,以便飞行机组在系统故障时能接收到及时、清晰的警告信息。
综上可知,STPA-Bayes和NTSB都从系统级的角度出发,强调了液压系统及动力传输组件PTU的重要性,要求机组成员做好定期的维护和检查,并且增加详细的故障提示,以便及时发现故障迹象来预防危险事件。区别在于:STPA-Bayes考虑的更全面和具体,通过控制理论和可靠性理论,额外强调了余度管理在襟翼控制系统的关键作用。在据致因场景影响度分析中,STPA的优势得以体现,它能够全面地识别出所有潜在的致因场景,确保了分析的完整性。根据分析结果,建议增强液压系统与控制器通道的余度设计,以防止单点故障对系统的影响。在组件重要度分析中,贝叶斯网络展现了其独特的优势,它能够直观地建模出系统内部各组件间的交互关系。根据分析结果,建议对PTU的控制逻辑进行优化,并增强其状态监控与告警功能,以防止因过热失效而导致的双液压源同时失效的风险。
随着中国民航业的快速发展,航空安全问题日益受到重视。2018年10月25日,执行福州-重庆-拉萨任务的厦门航空MF8411航班[执飞该航班的是波音737-700型客机(编号B5278)]在到达目的地前出现襟翼卡阻,导致飞机无法减速和爬升,最终机组启动应急措施,在拉萨机场上空盘旋减重,最终于14:53分安全着陆,机上旅客、机组88人无人伤亡[19]。该事故的类型与捷蓝航空事故有相似之处,但也存在一些差异,襟翼的卡阻可能由多种原因导致,通过对比分析可以更全面地理解航空事故的复杂性和多样性。
在航空襟翼卡阻事件中,机组凭借专业的应急处置能力成功化解了危机,但此类事件也凸显了航空系统中潜在的安全隐患。STPA-Bayes方法作为一种先进的安全分析方法,能够从系统层面深入剖析此类事故的成因,揭示襟翼卡阻可能涉及的系统设计缺陷、维护不足以及操作流程中的潜在风险。在确保系统安全的同时,还提供了针对性的改进建议,凸显了该方法相较于传统安全分析手段的显著优越性。
采用的STPA-Bayes分析方法可以为航空事故的致因分析与风险评估提供支持,有效性也通过传统方法得到验证,且提出的安全建议可以帮助系统改进,以降低系统中潜在的风险并提高系统安全性。得出如下结论。
(1)在致因分析上,STPA可以全面地识别襟翼控制系统中的薄弱环节,从执行机构、控制器和传感器3个方面出发,分析故障/错误传播路径,探究引发事故的潜在因素。
(2)在风险评估上,贝叶斯网络可以量化评估航空事故风险,以形式化方式建模并描述组件之间的交互关系,得出导致事故的主要因素为液压源故障,而PTU故障和液压管路泄漏是导致液压源失效的主要原因,关键重要度分别为0.688和0.299。
  • 国家重点研发计划(2022YFB4301000)
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doi: 10.12404/j.issn.1671-1815.2405472
  • 接收时间:2024-07-21
  • 首发时间:2026-05-13
  • 出版时间:2025-07-18
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  • 收稿日期:2024-07-21
  • 修回日期:2025-04-12
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国家重点研发计划(2022YFB4301000)
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    中国民航大学安全科学与工程学院, 天津 300300
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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