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摘要:
应用GO-FLOW法分析了飞机电静液作动器（EHA）的可靠性。首先在EHA单元功能合理划分的基础上，建立了EHA的GO-FLOW可靠性分析模型，采用布尔代数求解描述反馈环的布尔方程，解决了GO-FLOW图不允许存在循环的难题；其次进行了GO-FLOW运算，得到EHA系统在各时间点的可靠度；再次与GO法的结果比较，验证了GO-FLOW法的可行性和准确性；最后通过MATLAB曲线拟合，得到系统可靠度随时间的变化规律，以便及时对系统进行检修和维护。结果表明GO-FLOW法只需一次运算，就可得到系统在各时间点的可靠度，在减小计算复杂度方面较GO法有优势。
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关键词:
- 电静液作动器(EHA) /
- GO-FLOW法 /
- GO法 /
- 布尔代数 /
- 可靠性分析
Abstract:The GO-FLOW methodology is applied in the reliability analysis of aircraft electro-hydrostatic actuator (EHA). Firstly, based on the reasonable division of unit function, GO-FLOW reliability analysis model of EHA was established. In order to solve the difficult problem that GO-FLOW chart cannot contain feedback loops, Boolean algebra was used to solve the Boolean equations that describe the feedback loops. Secondly, the GO-FLOW calculation was finished and the system reliability at each time point was obtained. Thirdly, compared with the results of GO methodology, the feasibility and accuracy of GO-FLOW methodology were clearly verified. Finally, the system reliability changing rule with time was obtained through the MATLAB curve fitting so that the system can be repaired and maintained timely. The results show that the GO-FLOW methodology can easily obtain the system reliability at each time point with only one operation and has more advantages than GO methodology in reducing computational complexity.
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表 1 EHA系统的操作符数据
Table 1. Operator data of EHA system
编号 类型 参数 含义 1 25 R(1)=0, R(t)=1(t≠1) 电源信号 2 25 R(1)=0, R(t)=1(t≠1) 控制指令信号 3 25 R(2)=1, R(t)=0(t≠2) 电机运行信号 4 25 R(3)=1, R(t)=0(t≠3) 泵运转信号 5 25 R(4)=300 h, R(t)=0(t≠4) 时间间隔信号 23 25 R(1)=0, R(t)=1(t≠1) 油液信号 6, 7 21, 35 Pg=0.999 997 9,
λ=2.1×10-6/h控制器 8, 9 26, 35 Pp=12.0×10-6,
Pg=0.999 973 0, λ=15.0×10-6/h电机 10, 11 30 与门 12, 13 21, 35 Pg=0.999 999 5,
λ=0.5×10-6/h速度传感器 14, 15 21, 35 Pg=0.999 999 5,
λ=0.5×10-6/h位移传感器 16, 17 21, 35 Pg=0.999 999 5,
λ=0.5×10-6/h压力传感器 18 22 或门 19, 20 26, 35 Pp=0.0, Pg=0.999 988 0,
λ=12.0×10-6/h泵 21, 24, 30 21 Pg=0.999 998 8 单向阀 22, 25, 31 35 λ=1.27×10-6/h 单向阀 26, 32 21 Pg=0.999 992 0 过滤器 27, 33 35 λ=8.0×10-6/h 过滤器 28, 34 21 Pg=0.999 996 2 安全阀 29, 35 35 λ=3.8×10-6/h 安全阀 36, 37 30 与门 38, 39 21, 35 Pg=0.999 999 6,
λ=0.4×10-6/h作动筒 
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表 2 EHA系统输出信号的强度
Table 2. Output signal intensity of EHA system
操作符
编号操作符
类型输出信号在各时间点的强度 1 2 3 4 22 35 0.000 00 0.000 00 0.999 96 0.991 51 36 30 0.000 00 0.999 83 0.999 83 0.992 02 39 35 0.000 00 0.000 00 0.999 79 0.983 48
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表 3 EHA系统各时间点输出信号的强度
Table 3. Output signal intensity of EHA system at each time point
时间/h 信号强度 操作符22 操作符36 操作符39 0 0.999 96 0.999 83 0.999 79 50 0.998 55 0.998 52 0.997 05 100 0.997 13 0.997 22 0.994 32 150 0.995 73 0.995 92 0.991 60 200 0.994 32 0.994 62 0.988 89 250 0.992 92 0.993 32 0.986 18 300 0.991 51 0.992 02 0.983 48
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