Patent ID: 8452424

Claim:
A moving object feed-forward control method that is used for a positioning control that positions a moving object among a plurality of control objects, and that computes a control input (U(z)) of a feed-forward control for the moving object by inputting a position command (Rc(z)) to a digital filter that is configured from a finite impulse response filter (Nf(z)/Z n ), the moving object feed-forward control method comprising: wherein a numerator polynomial expression (Nf(z)) of the finite impulse response filter (Nf(z)/Z n ) includes a root of a denominator polynomial expression (D(z)) for a transfer function model in a discrete-time system of the control objects, setting a coefficient (ak) of the numerator polynomial expression (Nf(z)) of the finite impulse response filter (Nf(z)/Z n ) by making an evaluation function (J) that is a quadratic form of the coefficient (ak) as small as possible to cause the moving object, after the position command (Rc(z)) arrives at a target position, to arrive at the target position in a number of steps that is a degree (n) of the finite impulse response filter (Nf(z)/Z n ) with a hardware processor, reducing a gain of the finite impulse response filter (Nf(z)/Z n ) at a specified frequency, the specified frequency being defined as being within a range of +10% from a resonant frequency that generates resonant vibration in the control objects, and determining a weighting matrix (Qfk) that performs constraint of the specified frequency in a positive definite matrix (Q) of the evaluation function (J) by substituting the specified frequency into a function that is expressed by a square of a gain characteristic of the finite impulse response filter (Nf(z)/Z n ).