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目的获取中国男性青年坐姿Z轴振动的频率计权曲线。方法被试者为 1 0名男性青年 ,身体健康。实验采用对偶法。标准激励为频率 8Hz、加速度 1 .0m/s2 的正弦振动 ,实验激励也是正弦振动 ,频率为 4～ 80Hz,共 1 4种。被试者自然放松地坐在实验座椅上 ,座椅刚性地固定在振动台面上。被试者首先承受标准激励 ,获得一个振动感觉 ,然后承受实验激励 ,用信号调节与切换装置调节其强度 ,直到获得与标准激励相同的振动感觉为止。再用振动信号记录系统记录此时实验激励的振动加速度的均方根值。将记录的数据利用最小二乘和优化设计的方法拟合成振动频率计权曲线。结果所得到的振动频率计权在 1 6～ 80Hz显著地大于ISO 2 631 - 1相应的频率计权 (P <0 .0 0 5) ,在其它频率上则无显著差异。结论坐姿中国男性青年对 1 6～ 80Hz的Z轴振动比ISO 2 631 - 1规定的更敏感。
Objective To obtain the frequency weighting curve of Z-axis vibration of Chinese male youth sitting posture. Methods Subjects were 10 male youth, in good health. Experiments using dual method. The standard excitation is a sinusoidal vibration with a frequency of 8 Hz and an acceleration of 1.0 m / s2. The experimental excitation is also sinusoidal with a frequency of 4 to 80 Hz, for a total of 14 types. Subjects naturally sit relaxed on the experimental seat, the seat is rigidly fixed on the vibration table. Subjects were first subjected to a standard stimulus, to obtain a vibrational sensation, and then subjected to experimental stimuli, with signal conditioning and switching devices to adjust their intensity until the same vibrational sensation as standard stimuli. Then use the vibration signal recording system to record the experimental root mean square vibration acceleration. The recorded data is fit into the vibration frequency weighted curve by least square and optimized design. Results The resulting vibrational frequency weights were significantly greater at 16-80 Hz than the corresponding frequency weights at ISO 2631-1 (P <0.05), but not at other frequencies. Conclusions Sitting Chinese male youth is more sensitive to the Z axis vibration of 16-80Hz than ISO 2 631-1.