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This paper proposes an approach on broadband robust controller design of multi-frequency-band parallel control system in order to achieve a significant vibration reduction in broadband frequency range. Mechanical systems usually have vibration and noise problems in various frequency ranges. A complex high-order modeling has to be conducted to control the vibration and noise in broadband frequency range. In this case, the modeling error is generally increased, resulting in a degradation of control performance. This study designs the multiple subcontrollers based on the multiple sub-models derived in the corresponding frequency ranges. The order of each sub-model becomes small and so the modeling accuracy is improved. The total controller is constructed as the parallel circuit with each sub-controller designed in each frequency range. Each sub-controller is designed to satisfy the closed-loop stability against the interference to other sub-controllers in thisstudy. It is verified that the calculation efficiency and control performance can be enhanced by the proposed control strategy.

Broadband Robust Controller Design of Multi-Frequency-Band Parallel Control System