Table 3 Visibility evaluation criteria
From: A maintenance time prediction method considering ergonomics through virtual reality simulation
No | Visibility description | Scope analysis area | Visibility level |
|---|---|---|---|
1 | Maintenance objects and the operation can be directly seen during the whole maintenance process | 15° scope cone | Good |
2 | Before maintenance activities, can see maintenance objects directly, but the maintenance operation is invisible due to physical or maintenance equipment/tools block when maintenance personnel is operating | 35° scope cone | Normal |
3 | Maintenance objects and internal operations are not directly seen in the entire maintenance process, it is mainly depend on the experience, feeling and skill level | Other scope cone | Bad |