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The Mechanical impedance of the human body in sitting and standing position at low frequencies

Author: Rolf R Coermann; Aeronautical Systems Division (U.S.).
Publisher: Wright-Patterson Air Force Base, Ohio : Aeronautical Systems Division, Air Force Systems Command, United States Air Force, 1961.
Series: ASD technical report, 61-492.
Edition/Format:   Book : National government publication : English
Database:WorldCat
Summary:
The theory of the mechanical impedance of systems with one or more degrees of freedom is applied to the human body. A method of measuring mechanical impedance and determining the parameters of the vibrating systems is developed. Impedance curves for longitudinal vibrations of a sitting and standing subject are established for the frequency range of 1 to 20 cps. The influence of varied posture and restraining systems  Read more...
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Details

Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Rolf R Coermann; Aeronautical Systems Division (U.S.).
OCLC Number: 438241307
Notes: "September 1961."
AD0413478 (from http://www.dtic.mil).
Research supported by the United States Air Force, Air Force Systems Command.
Description: vi, 39 p. : ill. ; 28 cm.
Series Title: ASD technical report, 61-492.
Responsibility: Rolf R. Coermann.

Abstract:

The theory of the mechanical impedance of systems with one or more degrees of freedom is applied to the human body. A method of measuring mechanical impedance and determining the parameters of the vibrating systems is developed. Impedance curves for longitudinal vibrations of a sitting and standing subject are established for the frequency range of 1 to 20 cps. The influence of varied posture and restraining systems is investigated. Dynamic movements of body parts are measured, di rer indirectly, and compared with the im pedance curves. The responsible elements in the body for the apparent resonances are identified. Correlations between the impedance function of the body and the subjective tolerance curve to vibration are found and the reasons for the tolerance limits are elucidated. The variability of subjective tolerances due to varying posture, restraining systems, cushions, duration of ex posure and vibrations are discussed, and con clusions for the development of protective de vices are drawn. The correlation between the steady state response of the human body system and the effects of impact is discussed.

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