It is common to use sound insulation as a last resort for noise control in an urban city. Sound insulation of air-conditioned building is of importance. The stiffeners have important effects on the sound insulation properties of a stiffened structure. The experimental studies on the stiffened structures are vital for the study of the stiffener effects. Based on this concern, a simple stiffened ...

Shell structures, especially cylindrical shells, are widely used in aerospace and naval architectural industries. Submarine hulls and aircraft bodies can be idealized as cylindrical shell structures. The study of vibrations of cylindrical shells is an important aspect in the successful applications of the cylindrical shells. The free vibration characteristics of a submarine hull have an importa...

Purpose Fire door should withstand a high temperature without deforming. In the current paper, challenges of improving behaviour conventional fire were described using various internal stiffeners in pair swinging-type door. Design/methodology/approach The distribution on outside surface was measured with distributed eight thermocouples. Subsequently side cooled pressurized water hose jet stream...

The bucking strength calculation includes the determination of global buckling strength, the effective plate width and the torsional buckling strength of open section stiffeners. In each calculation the classic strength formula should be modified considering the effect of initial imperfections and residual welding stresses. The calculation method of Det Norske Veritas design rules and the Euroc...

Discrete Stiffness Tailoring (DST) is a novel manufacturing concept where stiffness tailoring achieved using discrete changes in ply angle to favourably redistribute stresses. Resulting performance increases can be exploited potentially achieve lightweight rapidly manufacturable structures, uninhibited by the minimum tow-turning radii which limit continuous fibre steering approaches. An efficie...

This paper proposes an explicit method for topology optimization of stiffened plate structures. The present work is devoted to simultaneously optimizing stiffeners’ shape, size and layout by seeking the optimal geometry parameters a series moving morphable components (MMC). stiffeners with straight skeletons curved are considered enhance modeling capability current approach. All represented und...

during the last few decades, steel shear walls have been adopted as efficient lateral resisting systems for high rise structures and numerous researches have been conducted on their static and dynamic behavior. steel shear walls have been utilized for retrofitting existing structures, as well as in design of new buildings in japan and usa. in this research, we have focused on the optimization o...

Abstract A model was developed and applied for predicting the vibroacoustic response of stiffened plates excited by different incident sound fields. relationship between Joint Acceptance Function (JAF) modal radiation efficiency is derived. This allows a direct calculation both vibration transmission loss (TL) in presence diffuse field whilst accounting full coupling. The structural configurati...

Underwater explosion seriously affects the combat performance and vitality of submarines. In order to improve blast resistance stiffened double cylindrical shells, a new type style that replaces traditional T-shaped stiffeners with circular tube stiffeners, namely O-shaped are studied. A series comparative underwater tests carried out on two scaled shells O stiffeners. Based tests, more detaile...