Evaluating vehicle ride comfort values, acceleration data of 12 axes (3 axes on the foot, 6 axes at the hip, 3 axes at the back) have been needed necessarily. After adopting frequency weighting values to these acquired acceleration data, we can obtain component, point and overall ride values. However, in the field of 'Human Vibration' the frequency weighting functions such as ISO 2631-1 and BS 6841 have been developed only using the Western people. So when we want to use these values for the Oriental people, some questions like compatibility and relevance which are evolved from the inherent differences(e.g., characteristic and shape of body parts, muscular and cellular tissue) between the Western people and the Oriental people may be argued.
In this study, the main objective is to represent equal sensation curves and to derive frequency weighting function about Korean people at interested frequency ranges. First of all, 27 samples of grown-up male persons were chosen randomly, and these samples were assumed as altering population. Then we carried out subjective evaluation with these samples in which the reference signal was 16 Hz and 1.4 m/s². This subjective evaluation was performed using sinusoidal excitation in the range from 2 to 125 Hz at eight determined amplitudes. Knowing the effect between weight differences, a group was composed with 10 average-weighted people and the other was done with 10 over-weighted people. And some kinds of non-parametric test were adopted to analyze subjective evaluation data and to verify whether all the data could be combined with a representative value or not.
Observing the equal sensation curves and the frequency weighting function about 27 males, the frequency ranges of 4~16 Hz were more sensitive to the Oriental people comparing to the 4~10 Hz ranges of the Western people.