Accession Number : ADA311872

Title :   Comparison of the Driving-Point Impedance and Transmissibility Techniques in Describing Human Response to Whole-Body Vibration,

Descriptive Note : Final rept. 1 Apr 92-28 Jul 93,

Corporate Author : ARMSTRONG LAB WRIGHT-PATTERSON AFB OH BIODYNAMICS AND BIOCOMMUNICATIONS DIV

Personal Author(s) : Smith, Suzanne D.

PDF Url : ADA311872

Report Date : MAY 1994

Pagination or Media Count : 15

Abstract : The driving-point impedance and transmissibility techniques were applied and compared to further evaluate the contribution of specific anatomical structures or regions in producing resonance behavior and nonlinear response characteristics. Five human subjects were exposed to sinusoidal and quasi-random vibrations which included frequencies from 3-21 Hz at two rms acceleration levels. Three quasi-random signals were generated using the sum-of-sines technique. While the results strongly supported the chest or upper torso as being the primary influence in generating the first impedance resonance peak, the data strongly suggested that the legs contributed to the nonlinear behavior observed for the second impedance peak under the test conditions used in this laboratory. The results also strongly supported the existence of coupling between the spine, upper torso or chest and head but will require further analytical and experimental evaluation. The data did suggest that the transmission of vibration to the head is dampened by the cervical spine above about 10 Hz.

Descriptors :   *VIBRATION, *DYNAMIC RESPONSE, *HUMAN BODY, *ACCELERATION TOLERANCE, TEST AND EVALUATION, PEAK VALUES, HUMANS, ACCELERATION, STRUCTURES, NONLINEAR SYSTEMS, BEHAVIOR, ANATOMY, RESPONSE(BIOLOGY), IMPEDANCE, HEAD(ANATOMY), PERCEPTION(PSYCHOLOGY), SPINAL COLUMN, LEGS, ANATOMICAL MODELS, BIODYNAMICS, PSYCHOPHYSIOLOGY, SEATS.

Subject Categories : Stress Physiology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE