Reducing the Collision Damage Done to the Tips of Steel Needles during Integrated Piercing by Using Shape Optimization with Feature Selection

Table 13

Statistics of experimental results.

Group no.	Picture no.	L2 (mm)	dned (mm)	Sum of safety distance	Sum of hazard distance	Mean	Variance	Percentage reduction of mean	Percentage reduction of variance
1	1-1	7.95	1.159	17957	2083.37	9.0476	20.2631	31.42%	27.71%
1	1-2	7.95	1.159	17941.2	2118.16	9.0521	20.5721
2	2-1	10	1.159	18150.9	2834.78	9.4829	21.9266	28.14%	22.51%
2	2-2	10	1.159	18274.4	2713.99	9.4841	21.8438
3	3-1	7.95	1.0	15092	8769.49	10.7971	21.5330	18.16%	23.99%
3	3-2	7.95	1.0	15202.9	8684.43	10.8039	21.4010
4	4-1	10	1.0	12919.7	16050.4	13.1802	28.0658	0	0
4	4-2	10	1.0	12288	16743	13.2139	28.4195