Shock transmissibility analysis and testing of an armored vehicle hull representation at high frequencies.

摘要

Recent Army research has found that armored vehicle components can be damaged by high frequency vibrations from ballistic shock. To enhance survivability of the new generation of combat vehicles, the Army has specified a minimum frequency range of 10 kHz for the design and qualification testing of components. The 10 kHz frequency is well beyond the practical limits of traditional analysis techniques such as the finite element method (FEM). In response to the challenge presented by the 10 kHz frequency requirement, as well as similar demands for high frequency shock prediction in related engineering projects, Teledyne Brown Engineering has developed a predictive scheme involving an extension of statistical energy analysis (SEA). Using the scheme substantially reduces computer run time and engineering labor over the traditional FEM, and thus facilitates the tractable prediction of shock response at 10 kHz frequencies. The scheme has been embodied within a computer code referred to as MANTA (Method of ANalysis by Thermodynamic Analogy). The content of this paper focuses on an analytical and test program for MANTA conducted upon an Armored Vehicle Hull Representation (AVHR) as a test article. Test measurements (performed by Sandia National Laboratories), as they correspond to the MANTA model, are described along with an elucidation on the complexities involved in making these precision measurements and subsequent signal processing. Preliminary comparisons of test results to analysis are presented. The paper concludes with an assessment of the growth potential of MANTA as a tool for the robust vehicle design for survivability and continued function after sustaining a battlefield impact.