Time integration algorithm of velocity frequency-weighted root mean square for ship comfort index

Abstract

The imposition of excessive ship vibration induces corresponding motions and forces within the human body, possibly causing discomfort and degraded levels of comfort and health. The ISO criterion is designed to limit potential vibration to improve the crew comfort. Frequency weighting values are used to evaluate whole-body vibration in accordance with ISO standard. This study describes the frequency method used to compute the frequency weighted velocity values by using acceleration time signals. Firstly, the relationship between velocity and acceleration is deduced in detail, and then a time domain integrated method is proposed to calculate the frequency weighted velocity RMS, finally, the validity of the method is assessed on a real sea test experiment and compared with frequency domain method.