Evaluation system of evaluation methods and the rod-like body of the rod-shaped body

摘要

PPROBLEM TO BE SOLVED: To provide a rod-shaped object evaluation method which easily evaluates vibration damping with a high degree of precision, and a rod-shaped object evaluation system. PSOLUTION: One end part of the rod-shaped object is fixed and the vibrations of the rod-shaped object in up and down directions and right and left directions are simultaneously measured by vibrating the rod-shaped object on the other end side thereof to obtain the time series data of the vibrations of the rod-shaped object in the up and down directions and the right and left directions. The peak times and peak levels of the vibration peaks of the rod-shaped object on respective mountain and valley sides are calculated with respect to the time series data of the vibrations of the rod-shaped object in the up and down directions and the right and left directions. The absolute value of the peak values in the time series data of the vibration of the rod-shaped object in the up and down directions is set to Up, and the absolute value of the peak values in the time series data of the vibration of the rod-shaped object in the right and left directions is set to Lp. The absolute value Lp of the respective peak values in the right and left directions of the peak times nearest to the absolute value Up of the respective peak values is extracted on the basis of the absolute value Up of the respective peak values. The value Vp of the square root with the absolute value Up of the peak values, and the extracted absolute value Lp of the peak values is calculated. A damping factor is calculated using the value Vp, and a loss factor is calculated on the basis of the damping factor. PCOPYRIGHT: (C)2011,JPO&INPIT