Fig. 1. Drawing of drifter
Fig. 2. Analysis model of drifter
Fig. 3. Convergency history in optimization process
Fig. 4. Comparison of Impact energy and impact frequency in 4 variable combinations
Fig. 5. Comparison of impact energy before and after optimization
Fig. 6. Comparison of impact frequency before and after optimization
Fig. 7. Comparison of overall impact performance before and after optimization
Fig. 8. Comparison of surge pressure before and after optimization
Fig. 9. Comparison of supply line formation pressure characteristics
Fig. 10. Comparison of input-output power characteristic
Fig. 11. Comparison of impact efficiency
Fig. 12. Test bench experiment
Fig. 13. Hydraulic drill experiment
Fig. 14. Comparison of drifter’s characteristic between simulation and experimental results
Fig. 15. Overall impact performance of drifter considering leakage
Table 1. Multi-objective function optimization goal setting
Table 2. Creation process of the initial meta model
Table 3. Process of sequential approximate optimization
Table 4. Comparison of relative error between simulation and experimental results
Table 5. Comparison of potential limit performance before and after optimization
References
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