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From Fig. 3, it can be seen that the fundamental frequencies of both stiffened spherical and cylindrical shell panels decrease with increased number of stiffeners for both cases: resting and not resting on elastic foundation.
Alkali emulsions of shellac are used to make self-polishing waxes, stiffeners for felt hats, cements, and sealers.
Glass beams are applied relatively frequently as transparent stiffeners for glass facades and roofs.
In practical engineering, cutouts in thin-walled cylindrical shells are usually welded with ringed stiffeners for the purpose of connect and seal.
In the early nineteen-forties, a brisk trade emerged between German death camps, such as Auschwitz, Majdanek, and Treblinka, and German felt and textile manufacturers who used the versatile fibre in the production of thread, rope, cloth, carpets, mattress stuffing, lining stiffeners for uniforms, socks for submarine crews, and felt insulators for the boots of railroad workers.
The analysis results show that the two-stage optimization method is effective for stiffener conceptual design, which provides a reference for designing actual stiffeners for ship hulls.
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Analyses have been performed to investigate the effect of fibre orientation, length to thickness ratio with same layup, aspect ratio with different layup configuration and different cut-outs shape for un-stiffened plate and the effect of height, position, number of stiffener, different types of stiffener and transverse stiffener for stiffened plate on buckling load.
The dimensions of ring-stiffeners for each shell segment are determined on the basis of the ring buckling constraint.
The bony foam core or trabecular bone is a closed-cell foam, which serves as a stiffener for the beak.
Numerical results for the efficiency of sound generation, its directivity, and the acoustic pressure signature, are given for clamped and simply supported conditions at the stiffener for aluminium plates in air.
Figure 4a depicts the decrease of central deflection with increased number of stiffener for cylindrical panel and shows that the deflection of cylindrical shell panel with orthogonal stiffeners is the smallest (i.e., the stiffest).
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