Table 6.
Trade-off comparison of different control approaches (advantage (+)/disadvantage (–)).
| Robust Control | Adaptive Control | Intelligent Control | ||||
|---|---|---|---|---|---|---|
| Disturbance source | H2-LQG Proposed | Model Reference Adaptive Control (MRAC) | Dual Control | Neural Networks Control (NNC) | Fuzzy Logic Control (FLC) | |
| Machining Parameters (Axis position, Spindle RPM, Feed rate, etc.) | (+) | Easy to implement | Negligible response on the system | Low time to reach convergence, process parameters variation is rapid | Simple programming | Based on expert knowledge |
| (−) | One operative range | Difficult to develop | Suboptimal solution needed | Convergence is time consuming | Difficult for MIMO system without adaption | |
| Actuation Parameter Characteristics | (+) | Easy to implement | Negligible response on the system | Process parameters variation is rapid | Simple programming | Extremely simple to implement |
| (−) | One operative range | Convergence is time-consuming | Extremely difficult to implement | Many data to be fitted | Difficult for MIMO system without adaption | |
| Missing Information after FE Model Reduction | (+) | Easy to implement | Negligible response on the system | Low time to reach convergence | Best model uncertainties, simple programming | Based on expert knowledge |
| (−) | One operative range | Convergence is time-consuming | Extremely difficult to implement, suboptimal solution needed | Many data to be fitted | Difficult for MIMO (Multiple Input Multiple Output) system without adaption | |