Radwin R G, Lin M L
Department of Industrial Engineering, University of Wisconsin-Madison 53706.
Ergonomics. 1993 Apr;36(4):379-89. doi: 10.1080/00140139308967895.
The availability of small, inexpensive electrogoniometers has made wrist posture measurement during repetitive manual work practical. Efficient analytical methods, however, are not currently available for quantifying the degree of repetitiveness and the interaction with postural stress. Spectral analysis was investigated as a method for characterizing repetitive wrist motion and postural stress using a simple peg transfer task. Wrist posture was controlled by adjusting the pegboard location and by having subjects reach over an obstruction. Work pace was externally controlled using an auditory signal. Angular wrist flexion/extension and ulnar/radial deviation was recorded using a 60 Hz sample rate. Power spectra were computed by stratifying data segments into individual work elements, divided by break points associated with the task. Peak spectral magnitudes and frequency components corresponded closely with joint displacement amplitudes and repetition rates. Spectrum DC component magnitudes were directly related to sustained wrist postures.
小型、廉价的电子角度计的出现使得在重复性手工工作期间测量手腕姿势变得切实可行。然而，目前尚无有效的分析方法来量化重复性程度以及与姿势压力的相互作用。研究了频谱分析，作为一种使用简单的插栓转移任务来表征重复性手腕运动和姿势压力的方法。通过调整插板位置以及让受试者越过障碍物来控制手腕姿势。使用听觉信号从外部控制工作节奏。以60赫兹的采样率记录手腕的屈伸角度和尺桡侧偏斜角度。通过将数据段分层为各个工作元素，并除以与任务相关的断点来计算功率谱。频谱峰值幅度和频率成分与关节位移幅度和重复率密切对应。频谱直流分量幅度与持续的手腕姿势直接相关。
