Parameters Optimization and Energy Absorption Evaluation of the Steel Ball Friction Energy Absorber

Table 3

Impact force under different load conditions.

Hammer			Drill rod
Impact frequency f(HZ)	Impact stock Ls (mm)	Mass m1 (kg)	Impact force F(N)
30	50	1.95	1348
30	50	2.15	1577
30	80	1.95	2157
30	80	2.15	2523
40	50	1.95	1798
40	50	2.15	2103
40	80	1.95	2876
40	80	2.15	3364