Vibration injuries in Norwegian forest workers: B. Hellstrøm and K. Lange Andersen 1972 British Journal of Industrial Medicine29, 255–263 (9 pages, 3 figures, 6 tables, 69 references)
- Book ID
- 104153647
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 62 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Authors" Sttmnzary. Many previous attempts to measure the transmission of'"sinusoidal" vibration through the human body have largely ignored the importance of harmonic distortion in the acceleration wave-forms. In practice distortions as great as 5070 are experienced.
This report covers a preliminary experiment in which seven young men, when seated in an ejection seat, were subjected to linear vibration in the vertical and lateral axes. Subjects were tested with and without a standard ejection seat harness. They sat in a normal position and were given no conscious task, other than viewing, or fixating on, a point on the vibrator coaming.
A Fourier analysis of the resulting input (seat) and output (head) accelerations was carried out, and values of seat-to-head transmissibility ratios obtained. Comparison of the transmission of harmonics suggested that non-linearities of the body were present even at the low amplitudes involved.
Further work is planned using a more suitable vibrator and more sophisticated analysis equipment.