2.2.11　effects of panel curvature and cabin internal pressurization
　　2.2.12　conclusions
　2.3　double-leaf panel filled with porous materials
　　2.3.1　introduction
　　2.3.2　problem description
　　2.3.3　theoretical model
　　2.3.4　validation of theoretical model
　　2.3.5　influence of porous material and the faceplates
　　2.3.6　influence of porous material layer thickness
　　2.3.7　influence of external mean flow
　　2.3.8　influence of incident sound elevation angle
　　2.3.9　influence of sound incident azimuth angle
　　2.3.10　conclusion
　appendix
　　mass-air-mass resonance
　　standing-wave attenuation
　　standing-wave resonance
　　coincidence resonance
　references
3　vibroacoustics of stiffened structures in mean flow
　3.1　noise radiation from orthogonally rib-stiffened plates
　　3.1.1　introduction
　　3.1.2　theoretical formulation
　　3.1.3　effect of mach number
　　3.1.4　effect of incidence angle
　　3.1.5　effect of periodic spacings
　　3.1.6　concluding remarks
　3.2　transmission loss of orthogonally rib-stiffened plates
　　3.2.1　introduction
　　3.2.2　theoretical formulation
　　3.2.3　model validation
　　3.2.4　effects of mach number of mean flow
　　3.2.5　effects of rib-stiffener spacings
　　3.2.6　effects of rib-stiffener thickness and height
　　3.2.7　effects of elevation and azimuth angles of incident sound
　　3.2.8　conclusions
　appendices
　　appendix a
　　appendix b
　references
4　sound transmission across sandwich structures with corrugated cores
　　4.1　introduction
　　4.2　development of theoretical model
　　4.3　effects of core topology on sound transmission across the sandwich structure
　　4.4　physical interpretation for the existence of peaks and dips on stl curves
　　4.5　optimal design for combined sound insulation and structural load capacity
　　4.6　conclusion
　references
5　sound radiation, transmission of orthogonally rib-stiffened sandwich structures
　5.1　sound radiation of sandwich structures
　　5.1.1　introduction
　　5.1.2　theoretical modeling of structural dynamic responses
　　5.1.3　solutions
　　5.1.4　far-field radiated sound pressure
　　5.1.5　validation of theoretical modeling
　　5.1.6　influences of inertial effects arising from rib-stiffener mass
　　5.1.7　influence of excitation position
　　5.1.8　influence of rib-stiffener spacings
　　5.1.9　conclusions
　5.2　sound transmission through sandwich structures
　　5.2.1　introduction
　　5.2.2　analytic formulation of panel vibration and sound transmission
　　5.2.3　the acoustic pressure and continuity condition
　　5.2.4　solution of the formulations with the virtual work principle
　　5.2.5　virtual work of panel elements
　　5.2.6　virtual work of x-wise rib-stiffeners
　　5.2.7　virtual work of y-wise rib-stiffeners
　　5.2.8　combination of equations
　　5.2.9　definition of sound transmission loss
　　5.2.10　convergence check for space-harmonic series solution .
　　5.2.11　validation of the analytic model
　　5.2.12　influence of sound incident angles
　　5.2.13　influence of inertial effects arising from rib-stiffener mass
　　5.2.14　influence of rib-stiffener spacings
　　5.2.15　influence of airborne and structure-borne paths
　　5.2.16　conclusions
　appendices
　　appendix a
　　appendix b
　references
6　sound propagation in rib-stiffened sandwich structures with cavity absorption
　6.1　sound radiation of absorptive sandwich structures
　　6.1.1　introduction
　　6.1.2　structural dynamic responses to time-harmonic point force
　　6.1.3　the acoustic pressure and fluid-structure coupling
　　6.1.4　far-field sound-radiated pressure
　　6.1.5　convergence check for numerical solution
　　6.1.6　validation of theoretical modeling
　　6.1.7　influence of air-structure coupling effect
　　6.1.8　influence of fibrous sound absorptive filling material
　　6.1.9　conclusions
6.2　sound transmission through absorptive sandwich structure
　　6.2.1　introduction
　　6.2.2　analytic formulation of panel vibration and sound transmission
　　6.2.3　application of the periodicity of structures
　　6.2.4　solution by employing the virtual work principle
　　6.2.5　model validation
　　6.2.6　effects of fluid-structure coupling on sound transmission
　　6.2.7　sound transmission loss combined with bending stiffness and structure mass: optimal design of sandwich
　　6.2.8　conclusions
　appendices
　　appendix a
　　appendix b
　　appendix c
　references

 2/3   首页 上一页 1 2 3 下一页 尾页

工业技术 一般工业技术

在线阅读