Transient acceleration waveform replication of electro-hydraulic systems using convex combined adaptive controller...

Area of Science:

• Control Engineering
• Hydraulic Systems
• Signal Processing

Background:

• Electro-hydraulic systems are crucial for generating vibration environments in industrial testing.
• System nonlinearities, variations, and disturbances degrade the accuracy of generated acceleration waveforms.
• Existing control methods struggle to achieve precise transient acceleration waveform replication.

Purpose of the Study:

• To propose a convex combined adaptive controller integrated with input shaping for electro-hydraulic systems.
• To enhance the transient acceleration waveform replication accuracy.
• To address dynamic variations, model uncertainties, and perturbations in electro-hydraulic systems.

Main Methods:

• A hierarchical controller combining a three-variable controller, an input shaping technique, and a convex combined adaptive controller.
• Input shaping controller designed using multi-innovation recursive least squares and zero magnitude error tracking algorithms.
• Adaptive upper-level controller with two filters for fast convergence and high tracking accuracy.

Main Results:

• The proposed controller significantly improved transient acceleration waveform replication accuracy.
• Experimental validation demonstrated superiority over existing methods using random and earthquake waveforms.
• The controller effectively compensated for system nonlinearities and external disturbances.

Conclusions:

• The developed convex combined adaptive controller with input shaping is effective for electro-hydraulic systems.
• This approach offers a robust solution for accurate acceleration waveform generation in vibration testing.
• The controller's adaptive nature ensures reliable performance under varying system dynamics and uncertainties.