(A) study on vibration factor for handle part of mailman's motor cycle
강원도 횡성군 8개 우체국에서 우편집배원 오토바이의 손잡이 부위의 진동정도를 fast
fourier transform분석계를 이용하여 노면 상태정도와 주행속도에 따라 주파수별 진동수
준을 측정하여 향후 우편집배원의 건강관리와 우편집배원의 오토바이 방진대책을 위한 자
료로 이용하기 위하여 본 연구를 실시하였으며 조사성적은 다음과 같다.
1. 포장도로에서 오토바이 손잡이 부위의 최고 가속도진동은 10 Hz에서 127±5.0 118∼
135) dB이고, 비포장도로에서는 15Hz에서 136±10.1 (131∼142)dB으로 저주파수성분(25 H
z이하)에서 높은 진동이 측정되었다.
2. 포장도로에서 최고진동수준 주행속도가 20km/hr이하일 때의 주파수 분석 결과 50Hz
에서 111±2.4 (107∼115)dB이며, 20km/hr이상일 때 150 Hz에서 139±6.2 (129∼148)dB으
로 중주파수성분(30∼400Hz)에서 영역이 높게 측정되었다.
3. 포장도로 및 비포장도로에서 주행속도와 진동수준 간에는 Y^^1 = 77.432 + 0.676X^^
l, (r = 0.836, n=56), Y^^2 = 83.486 + 1.836X^^2, (r = 0.963, n=24) 상관관계를 나타
냈으며 비포장도로의 주행속도 증가에 의한 진동 증가가 포장도로에 비해 많았다.
4. 국제표준기구의 허용값과 측정값을 비교하였을 때, 포장도로에서 측정한 오토바이
손잡이 부위의 최고가속도 진동수준은 10 Hz에서 127±5.0dB로 국제표준기구의 허용값(10
2dB이하)을 초과하였으며, 비포장도로에서 측정한 최고 가속도 진동수준은 15Hz에서 136
±10.1 dB로 국제표준기구의 허용값(102 dB이하)을 초과하였다. 포장도로에서 주행속도가
20km/hr 이상일때 최고 가속도 진동수준은 150 Hz에서 139±6.2 dB로 국제표준기구의 허
용값(123 dB이하)을 초과하였으며, 20km/hr 이하일 때는 최고가속도 진동수준은 50Hz에서
111±2.4 dB로 국제표준기구의 허용범위내에 있었다 (114 dB이하)
This study was conducted on measuring the level of vibration by frequency in
accordance with the grade of road condition and running speed through the
utilization of 'Fast Fourier Tranaform' for surveying the vibration degree of
handle part of mailman's motorcycle assigned to eight postal offices in
Hoengsung-kun(county), Kangwon-do(province) in order to use the reaults as the data
for health control of mailmen and the anti vibration countermeasures of their motor
The Results are as followings:
1. It was revealed that the vibration of the maximun acceleration generated by
the handle part of motor cycle running on paved road was 127±5.0(118-135) dB in 10
Hz, and 136±10.1(131-142) dB in 15 Hz on unpaved road, and thus a high vibration
was measued in a low frequency(below 25 Hz).
2. When a running speed was below 20 km/hr on the paved road, the analytic result
was revealed to be 111±2.4(107-115)dB, and When it was above 20 km/hr,
139±6.2(129-148)dB was discovered, and thereby the vibration was highly measured
in a middle frequency constituent(30-400Hz).
3. Correlations between the running speed and the vibration level on the paved
road and the unpaved road were appeared as follows:
Y^^l = 77.432 + 0.676X^^l (r = 0.836, N = 56), Y^^2 = 83.486 + 1.836X^^2 (r =
0.963, N = 24)
It was further revealed that the increase of vibration by the increase of running
speed on the unpaved road was larger as compared with the running speed on the
4. When compared with threshold limit values proposed by the International
Standard 0rganization, the vibration level of the maximum acceleration for the
handle part of motor cycle measured of the paved road was 127±5.0 dB, and thus it
was higher than the throshold limit Value (below 102 dB) set by the International
Standard 0rganization. On the other hand, the vibration level of the maximum
acceleration measured on the unpaved road was 136±10.1 dB in 15Hz and thus
revealed higher than the throshold limit value (below 102 dB), while when the
running speed on the paved road was above 20km/hr, the vibration level of the
maximum acceleration was measured at 139±6.2dB in 150Hz and thereby revealed the
threshold limit value as higher than that(below 123 dB) of the International
Standard Organization. In the meantimme, when it was running at 20 km/hr, the
vibration level of the maximum acceleration was measured at 111±2.4 dB and thus
reveale the threshold limit value as lower than that (below 114 dB) set by the
International Standard Orgazation in this regard.