| Citation: | PENG Hongtao, ZHANG Yunzhi, LING Jie, et al. Damping control of piezoelectric bimorph actuators for electrohydraulic servo valves in oil environments[J]. Journal of Aerospace Power, 2026, 41（4）：20250108 doi: 10.13224/j.cnki.jasp.20250108
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A composite damping control strategy was proposed to address the control challenges of piezoelectric bimorph actuators for electrohydraulic servo valves in oil environments. For the low-frequency range below 100 Hz, a feedforward compensation strategy based on inverse multiplication was adopted, combined with a feedback controller using a disturbance observer to enhance the system robustness. Experimental results showed that at 1 Hz, the root mean square (RMS) error was reduced from 1.76 μm to 0.83 μm, and at 100 Hz, it was reduced from 3.44 μm to 2.17 μm. For the high-frequency range of 500—700 Hz, a composite strategy based on positive velocity and position feedback (PVPF) damping control was proposed and compared with traditional proportional-integral-derivative (PID), feed-forward (FF)+disturbance observer (DOB), and FF+PVPF control methods. The results demonstrated that the composite control strategy effectively compensated for hydrodynamic disturbances and suppressed the lightly damped characteristics near the first natural frequency, maintaining RMS tracking errors below 2.5 μm under various operating conditions. This study could provide a novel control approach and experimental validation for the application of piezoelectric bimorph actuators in high-precision electrohydraulic servo systems.
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