Influence of Different Strings on the Dynamics of Japanese Bow

Abstract

The purpose of this study was to clarify the influence of different strings on the dynamics of Japanese Bow, and to investigate the relationship between the measured mechanical data and the feeling of shooter. Four strings, aramid fiber "Kevlar", "Technora", polyester fiber "Vectran", and hemp string were used for the shooting experiment by nine subjects. At that time, feeling data through questionnaires were collected. The results were summarized as follows: (1) in the logarithmic decrement of bending and torsional oscillation after release, hemp string was highest in this four strings, (2) the difference of fibers didn't have influence on frequency of the oscillation, (3) in the energy transmission efficiency, Kevlar, Technora and Vectran were about 69%, hemp was 67.7%, (4) it is also found that the feeling of shooter was related to the measured mechanical data significantly.