期刊
IEEE TRANSACTIONS ON ROBOTICS
卷 35, 期 6, 页码 1508-1515出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TRO.2019.2926496
关键词
Friction; Observers; Asymptotic stability; Robot sensing systems; Torque; Aerodynamics; Disturbance observer (DOB); flexible joint robots; friction observer; passivity-based stiction compensation
类别
This paper tackles a friction compensation problem without using a friction model. The unique feature of the proposed friction observer is that the nominal motor-side signal is fed back into the controller instead of the measured signal. By doing so, asymptotic stability and passivity of the controller are maintained. Another advantage of the proposed observer is that it provides a clear understanding for the stiction compensation which is hard to be captured in model-free approaches. This allows to design observers that do not overcompensate for the stiction. The proposed scheme is validated through simulations and experiments.
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