Workers and Materials Protection: Center of Percussion its Calculations and Mechanical Applications

Abstract

The quality of hand tools used by industrial workers is very important for workers safety and production, this quality affected by a dynamic quantity called center of percussion. Center of Percussion can be defined as the place on an extended massive item connected to a pivot at which a perpendicular impact creates no reactive shock at the pivot. Translational and rotational motions cancel at the pivot when an impulsive blow is delivered at the center of percussion. A bat, racquet, door, sword, or other long item gripped at one end is usually referred to as the center of percussion. For an object hanging from a pivot as a pendulum, the same place is referred to as the center of oscillation, which indicates that a simple pendulum with all of its mass concentrated at that point will have the same period of oscillation as the complicated pendulum. In sports, the "sweet spot" of a bat or racquet is connected to the center of percussion, although the latter is also related to vibrational bending of the item. In this study a number of hand tools will be tested and examined as a rod and the center of percussion is calculated for them depending on derived empirical relations.