Results 221 to 230 of about 1,269 (259)

Effect of rib bending on Bloch wave structure of a rib-stiffened plate

The Journal of the Acoustical Society of America, 1997
It is well known that flexural vibration on a flat plate stiffened by periodically placed line supports shows stop/passband behavior in frequency, associated with Bloch waves. For a one-dimensional situation, with plate vibration incident normally on the ribs, a simple model in which the ribs exert forces normal to the plate by virtue of their mass ...
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Optimal design of rib-stiffeners in disks and plates

International Journal of Solids and Structures, 1989
Abstract Disks and plates subjected to stretching and flexure are stiffened by curvilinear ribstiffeners whose shape and cross-sectional area are subject to optimization. Sensitivity analysis is first discussed for an arbitrary integral functional of generalized stress, strain and displacement and boundary domains.
K. Dems, Z. Mróz, D. Szelag
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Bonded repairs to rib stiffened wing skins

Composite Structures, 2002
The present paper extends existing design formulae [Int. J. Solid Struct. 17 (1981) 827; J. Compos. Struct. 47 (1999) 737] for composite repairs to cracked metallic skins to include the bonded repair of rib stiffened wing skins. These design formulae are validated by comparison with the results of a series of 3D finite element studies and an ...
R. Jones, B. Whittingham, I.H. Marshall
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Buckling of Externally Pressurized Toroidal Shell With Stiffened Ribs

Journal of Pressure Vessel Technology, 2020
Abstract The buckling characteristics of toroidal shells with closed circular cross sections loaded with a static external pressure were investigated. Eight toroidal shell test models were developed: two ribless, two semicircular discrete ribs, two rectangular discrete ribs, and two rectangular continuous ribs.
Xiaorong Wang, Wenxian Tang, Xilu Zhao, Binbin Chen, Bo Zhao, Yongmei Zhu   +5 more
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Analysis of shells reinforced by massive stiffening ribs

International Applied Mechanics, 2008
The authors present results of the application of a heterogeneous mathematical model for the design of shell with massive stiffening ribs. Numerical results are obtained for a cylindrical shell with stiffening ribs. These results are compared with numerical results established in terms of the mathematical model of elasticity theory and the model of the
Savula, Y. H., Jarmai, K., Mukha, I. S.
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Sound absorption of a rib-stiffened plate covered by anechoic coatings

The Journal of the Acoustical Society of America, 2015
Underwater vehicles are often equipped with anechoic coatings to absorb the sound waves of active sonar and attenuate the noise emitted from the vessels. Rubber layers with periodically distributed air cavities are widely used as anechoic coatings.
Xinyi, Fu, Zhongkun, Jin, Yao, Yin, Bilong, Liu   +3 more
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Waves in a cylindrical shell stiffened by a helical rib

The Journal of the Acoustical Society of America, 1993
In vacuo elastic wave propagation characteristics in an infinite cylindrical shell stiffened by an infinite helical rib are investigated analytically. Equations of motion of the helical rib and of the cylindrical shell in helical coordinates are developed.
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Rib stiffened sound wave projector plate

The Journal of the Acoustical Society of America, 1996
A rib-stiffened sound wave projector plate is disclosed which generates lowrequency sound waves in a fluid medium when energized and flexed. A flexible sound wave projector plate includes at least first and second parallel, major planar surfaces. The first major planar surface includes at least one set of sound wave projector plate ribs, disposed ...
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Elastic response of an acoustic coating on a rib-stiffened plate

Journal of Sound and Vibration, 2010
This paper develops a three-dimensional analytical model of a fluid-loaded acoustic coating affixed to a rib-stiffened plate. The system is loaded by a plane wave that is harmonic both spatially and temporally. The model begins with Navier–Cauchy equations of motion for an elastic solid, which produces displacement fields that have unknown wave ...
Andrew J. Hull, John R. Welch
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Minimization of stresses in stiffening ribs of the cover of a water turbine

Journal of Machinery Manufacture and Reliability, 2014
The procedure for optimum design of the contour of an opening in the stiffening ribs of the cover of a water turbine is proposed. The problem of nonlinear programming with the purpose of minimization of maximum stresses in the given structure is solved with the use of the gradient method.
A. N. Shupikov, S. Yu. Misyura
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