An Investigation on the Biodynamic Foundation of a Rat Tail Vibration Model [2008]

Details

• Personal Author:
  Dong, Ren G. ; Kashon ML ; Krajnak, Kristine M. ; Welcome DE
• Description:
  The objectives of this study are to examine the fundamental characteristics of the biodynamic responses of a rat tail to vibration and to compare them with those of human fingers. Vibration transmission through tails exposed to three vibration magnitudes (1g, 5 g, and 10 g r.m.s.) at six frequencies (32 Hz, 63 Hz, 125 Hz, 160 Hz, 250 Hz, and 500 Hz) was measured using a laser vibrometer. A mechanical-equivalent model of the tail was established on the basis of the transmissibility data, which was used to estimate the biodynamic deformation and vibration power absorption at several representative locations on the tail. They were compared with those derived from a mechanical-equivalent model of human fingers reported in the literature. This study found that, similar to human fingers, the biodynamic responses of the rat tail depends on the vibration magnitude, frequency, and measurement location. With the restraint method used in this study, the natural frequency of the rat tail is in the range 161368 Hz, which is mostly within the general range of human finger resonant frequencies (100350 Hz). However, the damping ratios of the rat tail at the unconstrained locations are from 0.094 to 0.394, which are lower. than those of human fingers (0.708-0.725). Whereas the biodynamic responses of human fingers at frequencies lower than 100 Hz could be significantly influenced by the biodynamics of the entire hand-arm system, the rat tail biodynamic responses can be considered independent of the rat body in the frequency range used in this study. Based on these findings it is concluded that, although there are some differences between the frequency dependences of the biodynamic responses of the rat tail and human fingers, the rat tail model can provide a practical and reasonable approach to examine the relationships between the biodynamic and biological responses at midrange to high frequencies, and to understand the mechanisms underlying vibration-induced finger disorders. [Description provided by NIOSH]
• Subjects:
  Animals Biochemistry Biological Factors Biomechanical Phenomena Laboratories Occupational Health Safety Vibration
• Keywords:
  Analytical-processes Animal-studies Author Keywords: Hand-arm Vibration Biochemical-indicators Biodynamic Response Biodynamics Biological-effects Biological-factors Biomechanical-modeling Biomechanics Biostatistics Fingers Hand Laboratory-animals Rat Tail Model Statistical-analysis Vibration-exposure

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• ISSN:
  0954-4119
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  222
• NIOSHTIC Number:
  nn:20034893
• Citation:
  Proc Inst Mech Eng H 2008 Oct; 222(H7):1127-1141
• Email:
  dwelcome@cdc.gov
• Federal Fiscal Year:
  2009
• Peer Reviewed:
  True
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3ccd2d69679a08a410bef18a9fcec079f08a4c3f41ea2113e6b09bbaf2f20ca48e8dba6e0b73538583e27443b716c993007b87c16ae2db37947e948770b24b2f
• Download URL:
  https://stacks.cdc.gov/view/cdc/186932/cdc_186932_DS1.pdf
• File Type:
  [PDF - 986.61 KB ]