In the designing process of sporting gears, designers should consider the practical conditions. In case of ground golf club, the practical conditions mean grip force. Because vibration properties such as eigen-frequencies and logarithmic decrements obtained from under free condition are quite different from the practical condition. In this study, the above vibration properties under the practical condition are measured by using sensor glove system and modal analysis. The dependences of grip force upon the vibration properties are introduced. Moreover the validity of the FEM considering the grip force is discussed. As a result, it has been found that eigen-frequencies and logarithmic decrements under free condition and a practical condition were predicable by using the FEM in this study.
