Active Vibration Isolation System with Active Dynamic Vibration Absorber Using Kalman Filter Estimated Acceleration Feedback
Syed Mamun R Rasid, Md. Abdul Kader, Mhia Md. Zaglul Shahadat, Md. Emdadul Hoque, Takeshi Mizuno
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10.63414/jeas.v8.n2.2024.42
Abstract
An active vibration isolation system has been developed using an Active Dynamic Vibration Absorber (ADVA) that functions as an accelerometer in the high-frequency domain. The system employs an air spring to suspend the isolation table, serving as the control unit in the low-frequency region, while the ADVA controls high-frequency vibrations. The movements of the isolation table and the ADVA's absorber mass are regulated by a PID controller, with additional acceleration feedback enhancing isolation characteristics. Instead of costly servo-accelerometer or a noisy Micro-Electro-Mechanical Systems (MEMS) accelerometer, the acceleration of the isolation table is estimated using a Kalman Filter. The Kalman Filter-estimated acceleration is more accurate and less noisy than the ADVA-estimated acceleration. This estimated acceleration is integrated with PID control for the vibration control of the isolation table. Experimental results demonstrate significant performance improvements. The resonance peak of the isolation table is reduced from -64.65 dB to -73.58 dB, indicating a two-fold reduction and shorter settling time compared to ADVA-estimated acceleration feedback. In terms of vibration transmissibility, the resonance magnitude decreases from 12 dB to 3 dB. These results confirm that Kalman Filter-estimated acceleration enhances vibration isolation effectiveness and offers a cost-effective alternative to servo-type accelerometers.
Conclusion
The developed active vibration isolation system utilizes an ADVA that act as accelerometer in low-frequency and controller in high-frequency. By integrating PID control with Kalman Filter-estimated acceleration feedback, the system achieves
· low noise and more accurate acceleration signal as feedback compared to ADVA-acceleration
· a resonance magnitude reduction by factor of two in both compliance and transmissibility characteristics
· eliminates the need for costly servo-type accelerometers, reducing the overall system cost.
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