An Estimate of the Effect of Multiple Ejection Rack Flexibility on Six-Degree-of-Freedom Store Ejection Conditions.

摘要

A theoretical structural dynamic model of a MER (Multiple Ejection Rack),based upon BERNOULLI Pitch and yaw bending deflections and torsional rotation,is developed. Six-degree-of-freedom store ejection conditions are predicted. Sample computations were made for a M-117bomb and constant aircraft pull-up rates corresponding to up to a 3.9 'g'normal acceleration. The computations were for the second,fourth,and sixth bombs dropped in the normal release sequence from an A-7D right wing center pylon station. Ejection velocities computed do not deviate more than 15% from the rigid case. Ejection pitching and rolling rates are affected more significantly by flexibility. However,the pull-up maneuver alone affects the ejection conditions to a greater extent than flexibility for most ejection variables and 'g'values greater than 2.