Method and apparatus for reducing cross-coupled movement through

Details Method and apparatus for reducing cross-coupled movement through Method and apparatus for reducing cross-coupled movement through

1992-02-25

1993-06-15

Ip, Paul

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318600, 318607, 318625, 318807, 36447429, H02P 540, G05B 102

Patent

active

052202623

ABSTRACT:
A method and apparatus are disclosed for reducing the cross-coupled movement in a member of a CNC machine caused by movement in another member of the machine through the structural dynamics of the machine. The method includes receiving the discrete position commands for a member oriented in one axis of movement for the machine, transforming the discrete position commands to attenuate frequency components that contribute to the movement coupled through the structural dynamics of the machine, and generating velocity commands from the transformed discrete position commands to control the servos that drive the members. The discrete position command transform is preferably a second order filter that implements the transfer functions of a digital notch filter and digital low pass filter. The second order filter that transforms the discrete position commands is implemented in a digital computer by state variable difference equations.

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