Dynamic Characteristics and Human Perception of Vibration Aboard a Military Propeller Aircraft
Abstract
The dynamic characteristics and human perception of higher frequency multi-axis vibration associated with a military propeller aircraft environment were investigated. Triaxial accelerations were measured at the interfaces between the occupant and aircraft seat surface (seat pan and seat back) to evaluate and compare the effects of the aircraft seat fitted with different cushions. While all cushions showed a significant reduction in the X-axis seat pan vibration as compared to the original operational seat cushion at the blade passage frequency (BPF~73.5 Hz), the associated accelerations remained significantly higher than the floor input accelerations. Transmissibility data confirmed these seat system characteristics at higher frequencies. A body region perception survey suggested that the subjects were most sensitive to the BPF component of the operational exposure in contrast to the results for the weighted acceleration levels (ISO 2631-1: 1997). Effective multi-axis vibration mitigation strategies depend on the relationships between the location, direction, magnitude, and frequency of vibration entering the occupant and human perception of the exposure. Current human exposure guidelines may not optimally reflect these relationships for assessing higher frequency propeller aircraft work environments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2007
- Accession Number
- ADA473700
Entities
People
- Anne Y. Walker
- David R. Bowden
- Jeanne A. Smith
- Jenny G. Jurcsisn
- Suzanne D. Smith
Organizations
- General Dynamics