Vibration Isolation And Anti-blast Analysis And Design Of Re-entrant Honeycomb Structure

Vibration attenuation and anti-blast security are important researchfocuses for vitality and firmness of vessels. So far researchers have madean important progress in the design of normal structures and materials forvibration attenuation and shock resistance which are become more andmore difficult to make a big breakthrough. Honeycomb porous materialswith light weight, shock resistance, good thermal insulation and soundinsulation performance are used as core material and less as main bearingstructures. In this paper, two kinds of composite honeycomb vibrationisolators with positive and negative Poisson’s ratio are designedrespectively. The vibration damping effect has been discussed from theaspects of strength, stiffness, dynamic characteristics and vibration leveldifference. Comparative studies on mechanical performance and vibrationreduction effects are conducted for the isolators with composite materialpanels and steel panels. Design methods for shape and size of re-entranthoneycomb isolator have been studied deeply and the influence onvibration performance with the changing of cell wall thickness and shapeparameters has also been explored. First, based on the dynamic analysismodals of re-entrant honeycomb isolator, the influence curves of isolatorstress, natural frequency, vibration level, vibration level difference withknown cell wall thickness, cell breadth dimension, cell height dimension are obtained. Then a dynamic optimization modal is built Optimizationresults shows that re-entrant honeycomb isolator possess good vibrationisolation performance and can provide theoretical guidance for the designof re-entrant honeycomb isolator.Blast and shock resistance performance is an important indicator ofthe vitality of warships. Navies and researchers have conducted a lot ofresearch. The broadside protection structure has been designed from theinitial single-layer structure to multi-layer cabin, so blast and shockresistance performance has been significantly improved. Meanwhile avariety of new materials and sandwich structures have been researched.Inspired by the characteristics of the microstructure of porous solidmaterials and sandwich structures, Yang Deqing proposed a re-entranthoneycomb defensive structure. In this paper, research on underwater blastresistance performance has been conducted. First, comparative study hasbeen carried out between the honeycomb defensive structures and thedouble-layer structure with no core, the single-layer structure. Then thedamage process of hexagon honeycomb defensive structure and re-entranthoneycomb structure has been analyzed and compared. Finally, thematerial of honeycomb core and layers of honeycomb cell has been studiedand the result can be taken as guidance for design of a re-entranthoneycomb defensive structure.