Investigation of Occupant Restraint Improvements to the SIIIS-3 Ejection Seat.
Abstract
During the Front Line Ejection Equipment Tests (FLEET) program, higher than anticipated radical values were recorded using the 103 lb Lightest Occupant In Service (LOIS) manikin ejecting in the SIIIS-3 ejection seat with and F-15 forebody. The radical value is calculated using the seat acceleration in the x and y axes, and the Dynamic Response (DR) in the z axis. It was observed that the LOIS manikin was poorly restrained in the seat regardless of the tension applied to the harness strap. Three concepts have been identified that can be readily incorporated into the seat to improve occupant restraint. These concepts are: an improved seat cushion using a conforming material, inertia reel rollers that are fixed with respect to the headbox, and inflatable elements attached to the lap-belt as pace fillers. Tests with manikins were performed to evaluate the proposed improvements. The large ADAM (218 lb) manikin and the LOIS manikin were subjected to impacts along the +z, -x, and +y axes using the AFRL Vertical Deceleration Tower (VDT) and Horizontal Impulse Accelerator (HIA). Test were conducted with the original seat configuration and with the proposed improvements incorporated into the seat Manikin response characteristics were measured and results were compared to determine the improvements provided by the modifications to the SIIIS ejection seat.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1999
- Accession Number
- ADA378913
Entities
People
- Chris E. Perry
- Steven M. Pint
Organizations
- Air Force Research Laboratory