A Comprehensive Method of Apportioning Reliability Goals for New Product of Hydraulic Excavator

Table 2

Suggested ranking system for the severity of failure modes.

Rank ()	Failure Effect	Failure Criterion	Illustration(e.g.)
10	Inconsistent with the safety legislation or the regulations	Hazardous without warning; Potential safety, health, or environmental issue	failure of a braking system
9		Failure will occur with warning; Potential safety, health, or environmental issue	leakage of a braking system
8	disruption or decline to facility function	The machine run malfunctioning	uncoordinated boom, arm and bucket movements
7		The machine running properly but Moderate disruption to facility function	travel slower than the speed limit
6	disruption or decline to secondary function	Some portion of secondary function is lost	failure of a position feedback of the GPS
5		Moderate disruption to secondary function; Some portion of process is delayed	shock absorber of the seat damaged
4	Appearance or noise and other functions is poor	Most users(>75%) likely to complain	abnormal engine noises
3		More than half (>50%)of the users likely to complain	distortion of the hood
2		a few users(>25%) likely to complain	excessive clearances on the surfaces
1	No discernible effect on safety, environment, or mission