A Maintenance Task Similarity-Based Prior Elicitation Method for Bayesian Maintainability Demonstration

Table 7

Evaluation rules.

Maintainability attribute	Evaluation rules
Entity reachability ()	Good: can observe the maintenance component comfortably, and there is a wide observation angle; (7–10); General: can generally see the outline of the maintenance component, though it can easily cause eye and body fatigue; (4–6); Poor: prone to fatigue in this pose. (0–3)
Visibility ()	Good: clear line of sight, and there is enough light; (7–10); General: the line of sight is blocked, or the light is dark; (4–6); Poor: the line of sight is seriously blocked, or the light is insufficient. (0–3)
Maintenance space ()	Good: no restrictions on the maintenance space for operating posture; (7–10); General: maintenance space for the body is basically enough, but the operator’s posture is abnormal; (4–6); Poor: there is not enough maintenance space for a body. (0–3)
Tools ()	Good: do not need the aid of auxiliary tools; (7–10); General: need auxiliary tools sometimes; (4–6); Poor: dependent on auxiliary tools. (0–3)
Technical level of the maintainers ()	Good: familiar with the relevant technical knowledge and can quickly determine the operation process and solve the problem; (7–10); General: is familiar with the relevant knowledge and can solve problems by referring to the operation manual; (4–6); Poor: only a general understanding of the situation and how to carry out the relevant work. (0–3)
Maintenance position ()	Good: ground; (7–10); General: have to climb to the machine; (4–6); Poor: need to stand outside the machine or in a similar position to the machine. (0–3)
Security ()	Good: no danger of being injured by heavy objects and there are no sharp edges that may scratch or danger of electrical shock; (7–10); General: there is a certain security threat, sometimes there are sharp edges that may cause bumps or scratches; (4–6); Poor: there is a security threat. (0–3)