Grey Relation Evaluation and Truth Value Fusion of Rolling Bearing Multisource Residual Stress

Table 2

The advantages and disadvantages of different methods.

Method	Advantages	Disadvantages
Grey relation	Concern the closeness of data	Difficult to separate trend items
Membership function method	Concern the distribution density among the data	1. Unknown membership function; 2. Difficultly calculate confidence level of the evaluation result
Maximum membership method	Concern the most densely distributed data	1. Too much depend on the original data sequence distribution; 2. Difficultly calculate confidence level of the evaluation result
Rolling mean method	Concern the equal weight of the data	1. Difficult to separate trend items; 2. Difficultly calculate confidence level of the evaluation result
Bootstrap method	Concern the equal probability of data resampling	1.Little data; 2. Small confidence interval
Grey bootstrap method	Concern the development trend and probability weighting of resampled data	Impossible multistep forecast