Performance of Nonlinear Energy Sink
Figure 7: Schematic of the powertrain model incorporating a single NES
Since the 1.5 Engine Order (EO) harmonic carries most of the vibration energy of the specific powertrain, the performance of the NES is measured against the reduction of the magnitude of this harmonic. This is analysed by comparing the transmission input shaft acceleration of the 1.5 EO when the powertrain operating with the NES (active NES- Red curve) against the powertrain operating with the NES inertia simply added to the clutch inertia (locked NES – Blue curve). The area between the red and blue lines is maximized whereas the maximum value is maintained below 500 rad/sec².
Figure 8. Acceleration amplitudes of the 1.5 EO harmonic for the system with locked and active NES
Figure 9. Time history of the angular velocity of the transmission input shaft with active and locked NES