Research Article
Reliability Importance Measures considering Performance and Costs of Mechanical Hydraulic System for Hydraulic Excavators
Table 4
Suggested ranking system for the severity of failure modes [
38].
| Failure effect | Failure criterion | Ranking | Coefficient |
| Inconsistent with the safety legislation or the regulations | Hazardous without warning potential safety, health, or environmental issue | 10 | 0.1 | Failure will occur with warning potential safety, health, or environmental issue | 9 | 0.2 | Disruption or decline to facility function | The machine runs malfunctioning | 8 | 0.3 | The machine runs properly but moderate disruption to facility function | 7 | 0.4 | Disruption or decline to secondary function | Some portion of secondary function is lost | 6 | 0.5 | Moderate disruption to secondary function | 5 | 0.6 | Appearance or noise and other functions is poor | Some portion of process is delayed | 4 | 0.7 | Most users (>75%) likely to complain | 3 | 0.8 | No discernible effect on safety, environment, or mission | More than half (>50%)of the users likely to complain | 2 | 0.9 | a few users (>25%) likely to complain | 1 | 1.0 |
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