Experimental study: Effects of typical man-rifle parameters on aiming performance

Abstract

The purpose of this study was to examine the aiming performance implications of three typical man-rifle parameters, including the stock length, stock axis height and front grip position. An orthogonal test with three factors and three levels was designed. The EMG data of selected muscles and muzzle fluctuations were obtained by surface electromyography test system and 3D motion capture system. The results showed that different man-rifle parameters led to an alteration of muscle fatigue, thereby affecting aiming stability. The length and height of stock caused different muscle fatigue levels of right arm, and left arm muscles were sensitive to front grip position and stock length changes. The stock length and stock axis height affected horizontal aiming stability, and vertical aiming stability responded to all three manrifle parameters. Overall, the stock axis height had the greatest impact on the aiming stability.