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Nonlinear behavior of sitting humans under increasing gravity.

Aviation, Space, and Environmental Medicine

|January 1, 1978

Summary

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Human body

Area of Science:

Biomechanics
Human Body Dynamics
Occupational Safety

Background:

Understanding the nonlinear properties of the human body is crucial for safety.
Previous research has primarily focused on normal gravity conditions.

Purpose of the Study:

To investigate the nonlinear properties of the upright sitting human body under increased gravity.
To analyze changes in driving-point impedance and seat-to-head transmissibility.
To develop a model explaining observed phenomena and derive protective measures.

Main Methods:

Determined driving-point impedance and seat-to-head transmissibility using a centrifuge to simulate increased gravity.
Calculated a nonlinear multi-degree-of-freedom model representing identifiable body parts.

Related Experiment Videos

Derived protective measures for both normal and sustained acceleration conditions.

Main Results:

Observed a distinct shift of resonances to higher frequencies under increased gravity.
Noted a significant increase in transmissibility from seat to head.
The developed model successfully explained the observed dynamic behavior.

Conclusions:

The human body exhibits nonlinear dynamic properties that are significantly altered under increased gravity.
Increased gravity shifts resonance frequencies and enhances transmissibility, necessitating specific protective measures.
A validated multi-degree-of-freedom model aids in understanding and mitigating risks associated with sustained acceleration.