• Proposed a hardware-agnostic, model-driven control strategy synthesizing bandwidth-limited current control with velocity filtering for hydrostatic rotary tables; • Established a voltage-correlated disturbance model to identify an optimal 4.212 kHz current loop bandwidth for maximizing noise rejection; • Developed a cascaded architecture integrating a tailored second-order Butterworth velocity filter to suppress multi-frequency mechanical disturbances; • Validated a 40% reduction in velocity fluctuations, an 85% decrease in tracking error, and a twofold expansion of system bandwidth without hardware modifications through experiments, demonstrating high extensibility to other precision motion platforms. Hydraulic rotary turntables play a crucial role in precision machining due to their high load capacity, positioning accuracy, and operational stability. However, inherent mechanical vibrations, characterised as multi-frequency sinusoidal disturbances proportional to the input voltage, significantly degrade their motion accuracy and stability. To address the issue, this paper proposes a model-driven disturbance suppression strategy that functions independent of mechanical hardware modifications. The approach combines a bandwidth-limited current loop with a second-order Butterworth velocity filter to attenuate high-frequency disturbances and noises effectively. Both physical and simulation models were developed to guide the optimization of current loop design. Results indicate that by limiting the current loop bandwidth to 4.212 kHz and implementing a velocity filter with a 600 Hz cut-off frequency, disturbance attenuation is significantly improved. Consequently, velocity error fluctuations are reduced by 40%, and steady-state tracking error decreases from 5.7% to 0.8%. After global parameter fine-tuning, the system dynamic response is further improved, extending the system bandwidth from 15.5 Hz to over 30 Hz and reducing the velocity error from 0.1381 deg/s to 0.0834 deg/s. This method demonstrates a practical, model-driven control solution for disturbance suppression in high-precision hydraulic rotary systems, exhibiting great potential for application across other precision motion platforms.
Ma et al. (Fri,) studied this question.