Accession Number : ADA471699


Title :   Deployable Air Beam Fender System (DAFS): Energy Absorption Performance Analysis


Descriptive Note : Technical rept.


Corporate Author : NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI


Personal Author(s) : Cavallaro, Paul V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a471699.pdf


Report Date : 30 Mar 2007


Pagination or Media Count : 48


Abstract : Performance curves detailing the energy absorption parameters of selectively sized deployable air beam fender systems (DAFSs) were established to enable future efficiencies in fender design. Numerical solutions were generated using the ABAQUS/Explicit Finite Element Analysis (FEA) Program for two mooring configurations: ship-to-ship and ship-to-causeway (non-ballasted). The governing energy balance was presented and the contributions of strain energy and air compressibility were assessed for various inflation pressures and DAFS sizes. The applicability and limitations of analytical methods based on assumptions of material inextensibility were also discussed. Comparisons were made between the numerical and analytical methods to demonstrate the importance of admitting strain energies of the fender material in the energy balance. Equations and conditions for proper scaling of pressure and volume terms in energy absorption calculations were developed and discussed.


Descriptors :   *FINITE ELEMENT ANALYSIS , *ENERGY ABSORBERS , VOLUME , COMPUTATIONS , NUMERICAL METHODS AND PROCEDURES , SEA BASED , COMPRESSIVE PROPERTIES , EQUATIONS , NUMERICAL ANALYSIS , UNDERSEA WARFARE


Subject Categories : Numerical Mathematics
      Statistics and Probability
      Undersea and Antisubmarine Warfare


Distribution Statement : APPROVED FOR PUBLIC RELEASE