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Mechanical resonance suppression technique for inertial reference unit based on band-pass filter disturbance observer
Tianyu Wang1, Weixiao Tuo2, Xingfei Li2
1State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.
ISA Transactions
|November 16, 2024
Summary
This study introduces a band-pass filter disturbance observer combined with a notch filter to suppress mechanical resonance in Inertial Reference Units (IRUs). This method enhances photoelectric tracking system accuracy by mitigating low-frequency vibrations.
Area of Science:
- Control Systems Engineering
- Mechanical Systems Dynamics
- Optical Engineering
Background:
- Inertial Reference Units (IRUs) are crucial for photoelectric tracking and pointing systems to mitigate disturbances.
- Flexible IRU supports often introduce low-frequency mechanical resonance (e.g., 36.7 Hz peak at 26.6 dB), degrading system performance.
- Addressing resonance asymmetry and time-varying characteristics is essential for robust IRU system stability.
Purpose of the Study:
- To develop and validate a novel method for suppressing mechanical resonance in IRU systems.
- To improve the stability accuracy and robustness of photoelectric tracking and pointing systems.
- To address challenges posed by asymmetric resonance peaks and time-varying system parameters.
Main Methods:
- Integration of a band-pass filter disturbance observer (BPF-DOB) with a notch filter.
- Experimental identification of mechanical resonance characteristics.
- Simulation and experimental validation of the proposed control strategy.
Main Results:
- The combined BPF-DOB and notch filter effectively suppressed mechanical resonance.
- Achieved a stability accuracy of 1.09 μrad for the IRU system.
- Demonstrated a 9.9% improvement in accuracy compared to traditional methods.
- Exhibited high robustness against time-varying resonance characteristics.
Conclusions:
- The proposed BPF-DOB and notch filter combination is an effective strategy for mitigating mechanical resonance in IRU systems.
- The method significantly enhances the stability accuracy and robustness of photoelectric tracking and pointing systems.
- This approach offers a reliable solution for systems experiencing asymmetric and time-varying resonance.
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