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Papers 【 Display / hide 】

• Robust Control of an Electrical Drive with a Flexible Joint Using PI Controllers Based on Torsional Torque Derivative Feedback

  Kahsay A.H., Derugo P., Shikata K., Katsura S., Szabat K.

  Energies 19 ( 1 )  2026.01

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  Electric drives are responsible for torque generation in most industrial processes and devices, including electromobility. The operational performance of industrial drives is often limited by torsional vibrations and time-varying load inertia. To address these challenges, this paper proposes and compares three robust control structures based on PI controllers augmented with additional feedback from the first and second derivatives of torsional torque. A higher-order integral disturbance observer (IDO) is employed to estimate the unmeasurable derivatives of torsional torque, enabling accurate compensation. Furthermore, a bio-inspired optimization algorithm (Britch-inspired Optimization Algorithm, BiOA) is utilized to determine the optimal gain coefficients for the PI controller and the additional feedback loops. The proposed methodologies are validated through simulations and experimental testing on a physical setup, demonstrating improved reference-trajectory tracking and enhanced torsional vibration suppression under varying load conditions.

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• Vibration Suppression in Torsional Systems Robust to Load-Inertia Variations Using Wave Control

  Shikata K., Szabat K., Katsura S.

  IEEE Transactions on Industry Applications  2026

  ISSN  00939994

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  This paper presents a vibration suppression approach for systems with elastic couplings, which combines standard control and observation structures with a novel wave-space transformation. By formulating the system dynamics as a wave system and designing a traveling wave controller to reject reflected waves, the proposed method achieves robust vibration suppression against variations in load-side inertia. Unlike conventional approaches that rely on online identification or adaptive mechanisms, which inherently require persistent excitation and may compromise suppression performance, the proposed method eliminates the need for such estimation. The paper details the modeling, controller design, and state-estimation scheme. Experimental results validate the effectiveness of the proposed method, showing superior immunity compared with conventional ones under varying load-side conditions and discussing the criteria for parameter selection for the observers and controller.

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• Itch Relief with Peltier Devices: Temperature Illusion to Break the Vicious Cycle of Itching

  Shikata K., Hisashiki R., Mine K., Muramatsu H.

  Journal of the Institute of Electrical Engineers of Japan 145 ( 5 ) 274 - 277 2025.05

  ISSN  13405551

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• The Game of Life: Beyond SDGs - Advancing a Sustainable Society Through Gamification

  Shikata K., Mine K., Saito R., Tsuda N., Tsuruok N.

  Journal of the Institute of Electrical Engineers of Japan 145 ( 1 ) 44 - 47 2025.01

  ISSN  13405551

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• Application of higher-order disturbance observer in the control structure of the two-mass system

  Derugo P., Haftu Kahsay A., Szabat K., Zawiślak R., Shikata K., Katsura S.

  Przeglad Elektrotechniczny 101 ( 6 ) 112 - 117 2025

  ISSN  00332097

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  The article presents issues related to vibration damping in a dual-mass system. A control structure with a PI controller and with additional feedback from the torsional torque and its derivative is used for the study. A higher-order integral estimator is proposed to obtain information on these variables. Results showing a significant improvement in the quality of estimation of these quantities compared to the classical observer are presented. Theoretical considerations are confirmed by simulation and experimental studies.

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