Meaning
Motion control technique that limits the rate of change of acceleration to reduce mechanical vibrations during rapid tool movements. Effective axis jerk attenuation smooths the transition between different velocity states in CNC machining or robotic paths. It functions by applying a third-order derivative filter to the motion profile to avoid the sudden changes of linear ramps.
This approach protects the machine structure from high-frequency excitation that leads to surface finish errors.
Filtering Process
S-curve acceleration profiles replace trapezoidal moves to ensure that the change in force is gradual. Softening these transitions through axis jerk attenuation minimizes the structural ring-down time after a high-speed traverse. Numerical controllers implement these limits within the look-ahead buffer to maintain path accuracy.
Dynamic Stability
High-frequency oscillations often stem from sudden changes in the motor torque command. Proper axis jerk attenuation keeps these excitations below the natural frequency of the machine tool spindle and frame. This strategy preserves the integrity of the drive components by reducing peak mechanical stress.
Production yields improve when the machine reaches a stable state faster at every corner.
Optimization Burden
Setting the jerk limit too low increases the total cycle time because the machine takes longer to reach its programmed velocity. High jerk causes noise. Balancing these factors requires a deep understanding of the machine’s structural capability under load.
Overestimating the necessary damping leads to wasted capacity and slower return on investment.
