Cockpit Seat and Pilot Helmet Vibration During Flight Operations on Aircraft Carriers
Abstract
The objective of this study was to characterize cockpit seat and pilot helmet vibration in a jet aircraft during aircraft carrier flight operations. The Remote Vibration Environment Recorder (REVER) was used to measure triaxial accelerations at the seat base, seat pan, seat back, and helmet in the F/A-18C (Hornet) aircraft during the catapult launch, touch-and-go, and arrested landing. Helmet pitch acceleration and displacement were estimated from the helmet translational acceleration data. Of particular interest was the substantial low frequency seat and helmet vibration observed during the catapult launch. During the stroke period, seat and helmet vertical (Z) accelerations reached 6 g and 8 g peak-to-peak, respectively, and occurred in the frequency range of 3 to 3.5 Hz. The associated helmet pitch reached peak-to-peak displacements ranging between 9 and 18 degrees. The large helmet rotations may be associated with helmet slippage that can cause partial or complete loss of the projected image on a helmet-mounted display (HMD) (vignetting). This is highly undesirable when using the HMD as the primary flight reference (PFR). The aircraft operational vibration can be regenerated in the laboratory for investigating this specific concern. The goal is to develop helmet-mounted equipment design guidelines that consider hostile vibratory environments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2003
- Accession Number
- ADA421363
Entities
People
- Suzanne D. Smith
Organizations
- Air Force Research Laboratory