Influence of hull resiliency on the response of shipboard equipment to shock
Keegan, Arthur Edwin
Baylis, John R.
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Current methods of shock design and analysis rely primarily on the input of large amounts of experimental data, assembled from underwater explosion tests, to describe the shock motion inputs to their systems. The object of this investigation is to arrive at a more complete characterization of the shock motion input, a net effect representing the interaction between the water applied pressure loading, the hull structural response and the equipment - foundation response. The model chosen is the cross section of a simple cylindrical shell with an inboard mounted simple oscillator, immersed in an acoustic medium. The input to the water-shell system is an exponentially decaying plane step wave incident normal to the cylinder longitudinal axis. The analysis employs the use of four-pole mechanical impedance techniques and Laplace transform methods. An analytic expression is derived, which has the form of a mechanical quadripole impedance. It relates shock wave pressure to equipment response, as a funct1on of shell geometry and oscillator mass and natural frequency. The lack of rigor associated with the description of a distributed mass system as a point phenomenon along with other restrictive conditions, cause the expression to be better termed a "quasi-impedance". The problem formulation and solution has limitations on both the mathematical and physical side and at this stage the results are to be regarded mainly as exploratory. The "quasi-impedance" is now capable of predicting qualitatively the effects of parameter variation on the response of simple equipments to shock wave inputs. Additional refinements of the shell model and comparison with experimental data will enable a more rigorous evaluation of quantitative effects.
This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library Collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title.
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