An Estimate of the Effect of MER (Multiple Ejection Racks) Structural Dynamics on Store Separation
NAVAL WEAPONS LAB DAHLGREN VA
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Structural flexibility has long been suspected as being a factor affecting the ejection phase dynamic response of stores. After hook opening, in-carriage loads, associated with a released store, and an ejection recoil force deflect the MER beam away from its initial position. This in turn leads to a lower ejection velocity, lower ejection pitch rate, and an induced rolling moment. A theoretical structural dynamic model is based upon Bernoulli pitch and yaw deflections and torsional rotation of the MER beam wing, pylon, hanger, shoulder pad, and ejector unit deformations are neglected. Detailed development for the present report is confined to the pitch plane bending and store pitch dynamics case. For small pitch angles a linear set of kinematic and dynamic equations for the store ejection phase is obtained. Sample computations are given for two stores and constant aircraft pull-up rates.
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