Accession Number : ADA096597


Title :   Analysis of Ejection Seat Stability Using Easy Program. Volume I.


Descriptive Note : Final rept. May 79-Sep 80,


Corporate Author : BOEING MILITARY AIRPLANE CO SEATTLE WA


Personal Author(s) : West,Christopher L ; Ummel,Brian R ; Yurczyk,Roger F


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a096597.pdf


Report Date : Sep 1980


Pagination or Media Count : 690


Abstract : High performance combat aircraft have extended the maneuvering/operating range into regimes that exceed the capabilities of current ejection seat systems. One of the problems encountered involves the unstable rotational characteristics of the typical ejection seat, resulting in a decreased probability of survival due to the reorientation of the ejecting crewmember into an attitude less tolerant to acceleration. Furthermore, an unstable ejection seat may neither clear the airframe, nor provide adequate ground clearance. The capability to simulate the trajectory of an escape system, and to determine its stability characteristics using classical stability and control methods, is required to enhance the development of both active and passive stability augmentation systems. The objective of this development effort was to develop an ejection seat classical stability analysis capability by incorporating SAFEST computerized simulation subroutines into the EASY program standard component library. The resultant computer program described in this User Manual/document is EASY and SAFEST Integration for the Evaluation of Stability and Trajectory (EASIEST). Volume I is a 'stand-alone' user manual describing the EASIEST program characteristics and complete information on the use of the program and how to apply it to ejection seat dynamics and control analysis. It contains listings of the procedure files, models, analysis, standard components, and subroutines. Volume II is Boeing proprietary and contains only the source code listings of EASY5.


Descriptors :   *COMPUTER PROGRAMS , *AIRCRAFT , *EJECTION SEATS , *ESCAPE SYSTEMS , COMPUTERIZED SIMULATION , MANEUVERABILITY , COMPUTER AIDED DESIGN , HAZARDS , AERODYNAMIC STABILITY , USER NEEDS , SUBROUTINES , TRAJECTORIES


Subject Categories : Aircraft
      Computer Programming and Software


Distribution Statement : APPROVED FOR PUBLIC RELEASE