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A Vibrotactile Feedback Device for Seated Balance Assessment and Training

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Proposal for improving ejection seats with respect to sitting comfort and ejection posture.

Aviation, Space, and Environmental Medicine

|May 1, 1975

Summary

Maintaining an erect pilot egress posture during flight can cause discomfort and spinal issues. A new seat design offers adjustable backrests for comfort and automatically optimizes posture during emergencies.

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Area of Science:

Aviation ergonomics
Biomechanical engineering
Aerospace safety

Background:

Pilot ejection seats can cause vertebral fractures due to flexion posture.
Maintaining an erect egress posture during flight leads to pilot discomfort and seat misalignment issues.
Current seat designs compromise comfort for emergency egress requirements.

Purpose of the Study:

To develop an innovative aircraft seat addressing the conflict between pilot comfort and emergency egress posture.
To enhance pilot safety by mitigating risks associated with ejection and prolonged flight postures.
To introduce a seat with a dynamically adjustable backrest for improved ergonomics.

Main Methods:

X-ray controlled seat studies were conducted to analyze posture and comfort.
A novel seat device with a variable back-rest construction was designed.
The system integrates automatic posture optimization synchronized with power retraction for emergency egress.

Main Results:

X-ray studies confirmed that optimal egress posture is incompatible with relaxed, long-term sitting.
The proposed seat design aims to provide comfort during normal operations.
Emergency egress posture is automatically achieved via synchronized power retraction.

Conclusions:

A variable back-rest seat design can resolve the ergonomic challenges of pilot seating.
The new seat enhances pilot comfort without compromising emergency egress safety.
This innovation represents a significant advancement in aviation seating technology.