... center-located or corner-located on the shell structure. Modal control behaviors of paired SQ actuators respectively placed on the top and bottom shell surfaces are also investigated later. The control forces and moments generated by the SQ actuator system are defined by their respective regions...

... functionally graded materials integro-differential equations shells (structures) stress-strain relations structural acoustics vibrations functionally graded material cylindrical shell natural frequency analytic solution Functionally graded material(FGM) is a kind of composite material...

... sound radiation. Active vibration isolation in a submerged cylindrical shell structure is investigated and how vibration suppression influences the far-field sound pressure is discussed. The FRF-based coupling method is adopted to establish the equations of motion of the SMR system, and the coupled FE...

... actuators plates (structures) propellers shafts shells (structures) structural acoustics transfer functions underwater vehicles vibration control vibrations Low frequency radiated noise from naval vessels can be attributed to fluctuating propeller forces. Operation of a marine propeller...

... shells. This paper presents the results obtained from the developed analytical framework and its validation through the successful comparison with several experimental studies. Analytical predictions are obtained for the shell structural vibration and sound pressure levels, for the frequency range up...

... 26 01 2011 26 01 2011 finite element analysis shells (structures) structural acoustics structural engineering computing underwater vehicles vibrations submarine pressure hull submerged free vibration external pressure When a thin-walled shell structure is subjected...

... ′ . The viscosity effect appeared only through functions ψ 1 k , ψ 2 k , and ψ 3 k . For inviscid fluid or for breathing vibrations (i.e., k = 0 ), these quantities vanish, as would be expected. compressible flow piezoelectric materials plastic flow shells...

... (structures) finite element analysis plates (structures) shells (structures) thin wall structures vibrations 2009 American Society of Mechanical Engineers ...

... the vibration problem of a finite shell under various admissible boundary conditions. The dispersion relations and the associated eigenvectors are also the means by which to construct transfer matrices used to analyze the vibroacoustic transmission in cylindrical shell structures or pipe-hose systems...

..., in which the effects of wave number conversion due to the periodic rings are obviously identified as additional bright patterns. 09 07 2007 01 05 2008 05 01 2009 damping Helmholtz equations shells (structures) structural acoustics vibrations Substituting Eqs. 13 , 16...

... mode 18 08 2006 24 05 2007 12 11 2007 buckling laminations mechanical stability nonlinear equations perturbation techniques shells (structures) supersonic flow vibrations Shell structures are widely used in mechanical and aerospace engineering. It is well...

... 06 2006 01 02 2007 vibrations shells (structures) finite element analysis The modal response of complete spherical shells has been investigated with progressively higher-order theories since the 1960s. While the emphasis has been on the axisymmetric modes of vibration ( 1 2 3...

... structure. To accommodate applications involving shell structures, both translational and rotational degrees of freedom are considered in the analysis. The BBVA is modeled with a simple, three-by-three impedance matrix to facilitate its subsequent incorporation into a larger structural optimization study...

... al. ( 11 ), and Chen and Shen ( 12 ) have presented analytical solutions for the plane strain static deformation and free vibration of hybrid composite shells with radially poled piezoelectric actuators. shells (structures) vibrations damping vibration control fibre reinforced composites...

... 02 2004 shells (structures) dynamic response distributed control bending piezoelectric transducers strain measurement strain sensors neural nets membranes structural acoustics electric potential Effective distributed structural control depends on accurate measurements...

... electro/elastic nonlinear shell structures is derived based on the virtual work principle. A generic curved triangular piezoelectric shell element is proposed based on the layerwise constant shear angle theory. The dynamic system equations, equations of electric potential output and feedback control force...