Fuzzy Reliability Analysis and Optimization Design of Hydraulic System of Bale Carrier for Tie Arm Device

Pei Chenghui,Liu Xingyan,Liu Zhigang,Zhang Tong,Li Guoliang

Table 5 Factor ranking table

Influencing factors	Grade
Influencing factors	1	2	3	4
Failure probability level ( $u_{1}$ )	rarely happens	occasionally	occasionally happens	happens very often
Severity level ( $u_{2}$ )	slight influence	medium effect	tremendous influence	deadly impact
Detection level of difficulty ( $u_{3}$ )	accurate detection	not easy to detect	hard to detect	unable to detect
Maintenance level of difficulty ( $u_{4}$ )	simple debugging	re-install	replace parts	unable to repair