Experimental active vibration control of moving wood saw bands

Abstract

This paper examines the feasibility and application of an active control strategy to reduce the transverse and torsional vibrations of a moving wood saw band. A nonlinear control strategy and an adaptive signal processing technique are applied to an experimental test stand of a moving band with adjustable tension. The nonlinear control allows the control system to quickly adapt to changes in vibration magnitude and provides an effective means for suppressing vibrations caused by external excitations and internal resonance. The on-line control is performed through a DSP (digital signal processing) board and control actuation is provided by non-contact electromagnetic forces. Experimental results show that the applied actuation suppressed both the transverse and torsional vibrations of the moving band, significantly reducing the vibration amplitude. The robustness of the active control is also investigated as a function of the input location of the control force.