SCIENTIA SINICA Informationis, Volume 50 , Issue 10 : 1559(2020) https://doi.org/10.1360/SSI-2019-0148

## A safety assessment method for a liquid launch rocket based on the belief rule base with environmental disturbance

• AcceptedOct 15, 2019
• PublishedOct 16, 2020
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### References

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• Figure 1

(Color online) The indicator system of safety assessment for large liquid launch vehicles

• Figure 2

(Color online) The safety assessment model for liquid launch vehicles based on BRB

• Figure 3

(Color online) Wireless sensor network test platform of the liquid launch vehicle

• Figure 4

(Color online) Observation data of the liquid launch vehicle

• Figure 5

(Color online) The training and testing process of safety assessment model for the liquid launch vehicle

• Figure 6

(Color online) The correlation analysis between the average distance of observation data and the characteristic uncertainty: (a) vibration; (b) incline

• Figure 7

(Color online) Comparative studies of safety assessment for the liquid launch vehicle

• Table 1   The semantic and referential values of shaking
 Reference degree $L$ $M$ $SH$ $H$ Reference value 3.12 9.38 31.24 65.63
• Table 2   The semantic and referential values of inclining
 Reference degree $L$ $BM$ $M$ $SH$ $H$ Reference value 0.003 0.03 0.045 0.06 0.0944
• Table 3   The semantic and referential values of safety
 Reference degree $H$ $M$ $L$ Reference value 1 0.5 0
• Table 4   The initial safety assessment model for the rocket
 Number Vibration Incline Rule weight Output $\left\{~{H,M,L}~\right\}$ Number Vibration Incline Rule weight Output $\left\{~{H,M,L}~\right\}$ 1 $L$ $L$ 1 $\left\{~{1,0,0}~\right\}$ 11 $SH$ $L$ 1 $\left\{~{0,0.5,0.5}~\right\}$ 2 $L$ $BM$ 1 $\left\{~{0.8,0.2,0}~\right\}$ 12 $SH$ $BM$ 1 $\left\{~{0,0.4,0.6}~\right\}$ 3 $L$ $M$ 1 $\left\{~{0.7,0.3,0}~\right\}$ 13 $SH$ $M$ 1 $\left\{~{0,0.3,0.7}~\right\}$ 4 $L$ $SH$ 1 $\left\{~{0.5,0.5,0}~\right\}$ 14 $SH$ $SH$ 1 $\left\{~{0,0.2,0.8}~\right\}$ 5 $L$ $H$ 1 $\left\{~{0,0.4,0.6}~\right\}$ 15 $SH$ $H$ 1 $\left\{~{0,0.1,0.9}~\right\}$ 6 $M$ $L$ 1 $\left\{~{0.5,0.5,0}~\right\}$ 16 $H$ $L$ 1 $\left\{~{0,0.4,0.6}~\right\}$ 7 $M$ $BM$ 1 $\left\{~{0.3,0.7,0}~\right\}$ 17 $H$ $BM$ 1 $\left\{~{0,0.3,0.7}~\right\}$ 8 $M$ $M$ 1 $\left\{~{0,1,0}~\right\}$ 18 $H$ $M$ 1 $\left\{~{0,0.2,0.8}~\right\}$ 9 $M$ $SH$ 1 $\left\{~{0,0.3,0.7}~\right\}$ 19 $H$ $SH$ 1 $\left\{~{0,0.1,0.9}~\right\}$ 10 $M$ $H$ 1 $\left\{~{0,0.2,0.8}~\right\}$ 20 $H$ $H$ 1 $\left\{~{0,0,1}~\right\}$
• Table 5   The optimized safety assessment model for the rocket
 Number Vibration Incline Rule weight Output $\left\{~{H,M,L}~\right\}$ Number Vibration Incline Rule weight Output $\left\{~{H,M,L}~\right\}$ 1 $L$ $L$ 0.18 $\left\{~{0.12,0.70,0.18}~\right\}$ 11 $SH$ $L$ 0.06 $\left\{~{0.12,0.75,0.13}~\right\}$ 2 $L$ $BM$ 0.42 $\left\{~{0.65,0.01,0.34}~\right\}$ 12 $SH$ $BM$ 0.44 $\left\{~{0.00,0.06,0.94}~\right\}$ 3 $L$ $M$ 1 $\left\{~{0.55,0.21,0.24}~\right\}$ 13 $SH$ $M$ 0.01 $\left\{~{0.15,0.28,0.57}~\right\}$ 4 $L$ $SH$ 0.43 $\left\{~{0.43,0.31,0.26}~\right\}$ 14 $SH$ $SH$ 0.07 $\left\{~{0.04,0.30,0.66}~\right\}$ 5 $L$ $H$ 0.87 $\left\{~{0.44,0.26,0.30}~\right\}$ 15 $SH$ $H$ 0.49 $\left\{~{0.02,0.34,0.64}~\right\}$ 6 $M$ $L$ 0.82 $\left\{~{0.61,0.15,0.24}~\right\}$ 16 $H$ $L$ 0.38 $\left\{~{0.67,0.13,0.20}~\right\}$ 7 $M$ $BM$ 0.09 $\left\{~{0.56,0.08,0.36}~\right\}$ 17 $H$ $BM$ 0.98 $\left\{~{0.00,0.00,1.00}~\right\}$ 8 $M$ $M$ 0.03 $\left\{~{0.03,0.64,0.33}~\right\}$ 18 $H$ $M$ 0.01 $\left\{~{0.71,0.18,0.11}~\right\}$ 9 $M$ $SH$ 0.08 $\left\{~{0.20,0.74,0.06}~\right\}$ 19 $H$ $SH$ 0.75 $\left\{~{0.00,0.18,0.82}~\right\}$ 10 $M$ $H$ 0.06 $\left\{~{0.60,0.10,0.30}~\right\}$ 20 $H$ $H$ 0.01 $\left\{~{0.12,0.52,0.36}~\right\}$
• Table 6   Comparative studies of MSE
 Model Our model BRB BP Fuzzy inference MSE 0.0044 0.0169 0.0171 0.0570

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