Experimental and simulation study on active vibration control of rotating machines using coconut-husk fiber composite

Vibrations may reduce the quality of products because of “chatter” during drilling operation, which may cause dimensional inaccuracy of drilled holes, poor surface finish, assembly, and operational problems. This therefore calls for the need for vibration absorbers or dampers. The drilling machine considered in this research was the MODIGS RBM 28B Radial Arm Drill. The vibrations during drilling operation of this machine were measured with the use of a Vibration Meter. This experiment was carried out on different metal workpieces which vary in their toughness and hardness; hence, the drilling machine was expected to vibrate with different amplitudes and frequency for these different metals.

In this experiment, Coconut Fibre was successfully simulated. The success was measured from how much of displacement the simulated coconut fiber composite absorbed and dampen down, keeping the machine to work at its optimum performance without excessive vibration, which normally could result to failure of machine components poor surface finish, and dimensional inaccuracy of holes.