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. 2009 Dec 7;6:44. doi: 10.1186/1743-0003-6-44

Figure 2.

Figure 2

Controller diagram. The "assist-as-needed" force parabolic term continuously inputs torque τm when errors are present during the tracking task. The input torque to the robot/hand system is the sum of different contributions of a viscous field τv, a gravity τG and inertia τI compensation. τH is the torque applied by the subjects wrist.