Nakashima Yumi, Maeda Setsuo
Vehicle Research Department, ISUZU Advanced Engineering Center Ltd, 8 Tsuchidana, Fujisawa, Kanagawa 252-8501, Japan.
Ind Health. 2004 Jan;42(1):65-74. doi: 10.2486/indhealth.42.65.
The effects of seat-back angle and accelerometer height at the seat-back on seat-back x-axis frequency-weighted root-mean-square (r.m.s.) acceleration have been investigated in field experiments. Experiment 1 investigated the range and variability, of frequency-weighted r.m.s. acceleration at the same measurement position, where the seat-back angle was 24 degrees from vertical on the floor and the accelerometer height was 38 cm up from the seat cushion surface. Experiment 2 investigated ranges of frequency-weighted r.m.s. acceleration between the reference position, which was the position used in experiment 1, and test positions at different seat-back angles, 4 degrees ahead of and 4 degrees behind the reference position. Experiment 3 investigated the range of frequency-weighted r.m.s. acceleration between the reference position which was the same as in experiments 1 and experiment 2, and test positions at different accelerometer heights at the seat-back from a seat cushion surface, 2.5 cm higher, 2.5 cm lower and 5 cm lower than the reference position. This investigation clarifies that different seat-back angles and accelerometer heights at the seat-back affect the frequency-weighted r.m.s. acceleration at these measurement positions, which is beyond the exposure values at which people are able to distinguish different vibration acceleration magnitudes.
通过现场实验，研究了座椅靠背角度以及座椅靠背上加速度计高度对座椅靠背X轴频率加权均方根（r.m.s.）加速度的影响。实验1研究了在同一测量位置时频率加权均方根加速度的范围和变异性，此时座椅靠背与地面垂直方向成24度角，加速度计高度从座垫表面向上38厘米。实验2研究了参考位置（即实验1中使用的位置）与不同座椅靠背角度的测试位置之间频率加权均方根加速度的范围，测试位置在参考位置前方4度和后方4度处。实验3研究了参考位置（与实验1和实验2中的相同）与座椅靠背上不同加速度计高度的测试位置之间频率加权均方根加速度的范围，测试位置相对于座垫表面比参考位置高2.5厘米、低2.5厘米和低5厘米。该研究表明，不同的座椅靠背角度和座椅靠背上的加速度计高度会影响这些测量位置处的频率加权均方根加速度，这超出了人们能够区分不同振动加速度大小的暴露值。
