Modeling of the Interaction Between Grip Force and Vibration Transmissibility of a Finger

Details

• Personal Author:
  Dong, Ren G. ; McDowell, Thomas W. ; Welcome DE ; Wu, John Z. ; Xu XS
• Description:
  It is known that the vibration characteristics of the fingers and hand and the level of grip action interacts when operating a power tool. In the current study, we developed a hybrid finger model to simulate the vibrations of the hand-finger system when gripping a vibrating handle covered with soft materials. The hybrid finger model combines the characteristics of conventional finite element (FE) models, multi-body musculoskeletal models, and lumped mass models. The distal, middle, and proximal finger segments were constructed using FE models, the finger segments were connected via three flexible joint linkages (i.e., distal interphalangeal joint (DIP), proximal interphalangeal joint (PIP), and metacarpophalangeal (MCP) joint), and the MCP joint was connected to the ground and handle via lumped parameter elements. The effects of the active muscle forces were accounted for via the joint moments. The bone, nail, and hard connective tissues were assumed to be linearly elastic whereas the soft tissues, which include the skin and subcutaneous tissues, were considered as hyperelastic and viscoelastic. The general trends of the model predictions agree well with the previous experimental measurements in that the resonant frequency increased from proximal to the middle and to the distal finger segments for the same grip force, that the resonant frequency tends to increase with increasing grip force for the same finger segment, especially for the distal segment, and that the magnitude of vibration transmissibility tends to increase with increasing grip force, especially for the proximal segment. The advantage of the proposed model over the traditional vibration models is that it can predict the local vibration behavior of the finger to a tissue level, while taking into account the effects of the active musculoskeletal force, the effects of the contact conditions on vibrations, the global vibration characteristics. [Description provided by NIOSH]
• Subjects:
  Behavior Biomechanical Phenomena Histology Musculoskeletal System Occupational Health Safety Vibration
• Keywords:
  Author Keywords: Grip Biomechanics Bionics Extremities Finger Finite Element Model Force Hand-arm Vibration Hand-arm Vibration Syndrome HAVS Joint Moment Models Muscles Musculoskeletal System Power Tools Tools Vibration Effects

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• ISSN:
  1350-4533
• 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
• Pages in Document:
  61-70
• Volume:
  45
• NIOSHTIC Number:
  nn:20049799
• Citation:
  Med Eng Phys 2017 Jul; 45:61-70
• Contact Point Address:
  John Z. Wu, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA
• Email:
  jwu@cdc.gov
• Federal Fiscal Year:
  2017
• NORA Priority Area:
  Construction
• Peer Reviewed:
  True
• Source Full Name:
  Medical Engineering & Physics
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a04f7257d4e5cdae2060d3eb1d30372336cfc0c70fd3570bd3bb639035d6bae9fa988d9e1b29f5458fe0dbd06329d58141ef60f8c717108605a86decbc0acae8
• Download URL:
  https://stacks.cdc.gov/view/cdc/210425/cdc_210425_DS1.pdf
• File Type:
  [PDF - 5.86 MB ]