Modeling and Optimization of Soft Start-Up for Hydroviscous Drive Applied to Scraper Conveyor

Table 2

Error analysis of RSM surface.

	Average error	Maximum error	Root mean square error	R^2 fitting
First order	0.113	0.193	0.123	0.884
Second order	0.096	0.437	0.152	0.826
Third order	0.04	0.11	0.046	0.972
Fourth order	0.028	0.071	0.037	0.982
Allowable value	<0.2	<0.3	<0.2	>0.9