Abstract
It is common that the amplitude of the vibration displacement is inverse proportional to the frequency if the vibration velocity is constant in all the frequency range. Also the amplitude of the displacement is inverse proportional to the square of the frequency if the vibration acceleration is constant in all the frequency range. This paper proposes "half-velocity" and "half-acceleration" as new vibration values, and explains the measurement principle and the usefulness of these values. The amplitude of the "half-velocity" is inverse proportional to the one-half power of the frequency, and the amplitude of the "half-acceleration" is inverse proportional to the 1.5th power of the frequency.
