This paper proposed a simple estimation method of peak impact force by a multi-D.O.F manipulator controlled
by a joint servo on collision with a human or an environment. In the proposed method, an impact model of the
manipulator including both compliances of joint servo and a soft material on a link is described as a 1-D.O.F
impact model. Taylor expansion is introduced to more exactly estimate the peak impact force using the time
that the value of time-derivative of the impact force equals to 0. As a result, the peak impact force is described
as an algebraic function and can be easily and quickly estimated. Simple impact simulations using a 2-D.O.F
manipulator were conducted to confirm the effectiveness of the proposed method. From the simulation results,
it was confirmed that the estimated value of the peak impact force was in accordance with a peak point of a
impact force calculated by numerical method.
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