KRASH Dynamics Analysis Modeling - Transport Airplane Controlled Impact Demonstration Test. Revision

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KRASH Dynamics Analysis Modeling - Transport Airplane Controlled Impact Demonstration Test. Revision

G. Wittlin / B. LaBarge

A transport airplane Controlled Impact Demonstration (CID) test is analyzed with program KRASH. Prior to modeling the test condition, supporting analysis of both narrow-body and wide-body transport airplane frame segments were modeled with KRASH and compared to existing test results. The results of the analysis are utilized as input data for the KRASH CID model. Prior to the CID test a narrow-body transport airplane was impacted with the ground, via a free fall drop, to obtain structure crush and damage data. KRASH modeling of this test was used to refine the CID KRASH model. The CID KRASH model is exercised to obtain anticipated floor accelerations, underside crush, fuselage forces, and deflections. All KRASH modeling is performed utilizing current enhancement features. The latest KRASH85 input-output format is described in a separate report. Contained in this report are descriptions of the following: (1) Recent KRASH85 coding changes to enhance its usage, (2) KRASH models and results for both narrow-body and wide-body transport airplane frame section drop tests, (3) KRASH model and results for a narrow-body transport airplane drop test, (4) KRASH model and results for a CID test to be performed, (5) Conclusions based on the CID pre-test analysis results. Keywords: KRASH, Crashworthiness, Crash dynamics computer simulation, Controlled impact demonstration, CID, Analytical predictions transport airplane.