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The coupling between structural and acoustic modes is investigated.
To alleviate this, a design method for a multifunctional load bearing vehicle body panel is proposed which attempts to achieve a balance between structural and acoustic performance.
This paper deals with the relations between structural and acoustic properties of model vitreous carbon foams, i.e., presenting different porous structures in terms of bulk density, cell size and connectivity, while having the same composition and the same carbon texture.
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Relations between the structural and acoustic variable on the structure-fluid interface are utilized to generate the coupled system of equations in terms of the kinematic shell variables and acoustic pressures on the fluid boundary.
The objective is to consider an optimum structure with an optimum interface between the structural and acoustic domains, for minimizing the acoustic response of the coupled system at specified points or surfaces inside the acoustic domain within a frequency range of interest, subject to the given amount of the material of the structure.
The biorthonormality relations between the left and right eigenvectors and the relations between the structural and acoustic components in the left and right eigenvectors are proved.
Furthermore, the shift in the structural modal frequency with core softening affects the modal coupling between the structural and acoustic domains.
The advantages of the approach are that an investigation into the coupling between the structural and acoustic systems is made easier, and it facilitates improved physical insight into the behaviour of structural-acoustic systems.
Due to the mismatch of dimensions between structural mobility and acoustic impedance, new terms are introduced for the coupled system analysis; the coupled acoustic impedance and the coupled structural mobility.F-u(force-velocity) andp-Q(pressure-source strength) diagrams are also introduced for impedance and mobility representations of a complete coupled system.
Both the structural and acoustic load quantities that are produced at the acoustic-structure interface are functions of unknown nodal degree of freedom.
In particular the effects of the coupling between one of the bounding surface face sheets and acoustic foam are examined for its impact on both the structural and acoustic overall performance of the panel.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com