Structural transmission at line junctions: a benchmarking exercise

Craik, R.J.M.; Bosmans, Ivan; Cabos, Christian; Heron, K.; Sarradj, Ennes; Steel, John Alexander; Vermeir, Gerrit

doi:10.1016/j.jsv.2003.07.011

Cited by 6 publications

(9 citation statements)

References 2 publications

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“…A more general case is represented by interfaces forming junctions between plates of varying thickness and meeting at arbitrary angles. The transmission/reflection coefficients for a set of plates coupled at a common interface (such as depicted in figure 3) may be computed using the methods presented in Langley & Heron [35] and Craik et al [36]. In particular, we consider the connection between plates as line junctions, that is, the interior properties of the junction are not modelled and, the mass and moment of inertia are neglected.…”

Section: Elastic Waves In Coupled Platesmentioning

confidence: 99%

Discrete flow mapping: transport of phase space densities on triangulated surfaces

et al. 2013

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Energy distributions of high-frequency linear wave fields are often modelled in terms of flow or transport equations with ray dynamics given by a Hamiltonian vector field in phase space. Applications arise in underwater and room acoustics, vibroacoustics, seismology, electromagnetics and quantum mechanics. Related flow problems based on general conservation laws are used, for example, in weather forecasting or in molecular dynamics simulations. Solutions to these flow equations are often large-scale, complex and high-dimensional, leading to formidable challenges for numerical approximation methods. This paper presents an efficient and widely applicable method, called discrete flow mapping, for solving such problems on triangulated surfaces. An application in structural dynamics, determining the vibroacoustic response of a cast aluminium car body component, is presented.

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Section: Elastic Waves In Coupled Platesmentioning

confidence: 99%

Discrete flow mapping: transport of phase space densities on triangulated surfaces

et al. 2013

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“…To find the transmission/reflection coefficients of a set of plates being coupled at a common interface (such as depicted in Fig. 3), we follow [11,12]. In particular, we consider the connection between plates as line junctions, that is, the interior properties of the junction are not modelled and the mass and moment of inertia are neglected.…”

Section: Interface Scattering Matrices For Plate Junctionsmentioning

confidence: 99%

Dynamical energy analysis on mesh grids: A new tool for describing the vibro-acoustic response of complex mechanical structures

et al. 2014

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We present a new approach for modelling noise and vibration in complex mechanical structures in the mid-to-high frequency regime. It is based on a dynamical energy analysis (DEA) formulation which extends standard techniques such as statistical energy analysis (SEA) towards non-diffusive wave fields. DEA takes into account the full directionality of the wave field and makes sub-structuring obsolete. It can thus be implemented on mesh grids commonly used, for example, in the finite element method (FEM). The resulting mesh based formulation of DEA can be implemented very efficiently using discrete flow mapping (DFM) as detailed in [1] and described here for applications in vibro-acoustics. A mid-to-high frequency vibro-acoustic response can be obtained over the whole modelled structure. Abrupt changes of material parameter at interfaces are described in terms of reflection/transmission ma- systems are considered: a double-hull structure used in the ship-building industry and a cast aluminium shock tower from a Range Rover. We demonstrate that DEA with DFM implementation can handle multi-mode wave propagation effectively, taking into account mode conversion between shear, pressure and bending waves at interfaces, and on curved surfaces.

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“…Los modelos analíticos planteados son semejantes, pero su materialización en rutinas de cálculo en ordenadores puede dar lugar a diferentes resultados, ya sea por las características de dichas rutinas o por errores en su programación. La verificación de estas rutinas es difícil a partir de las gráficas publicadas en revistas, por lo que los grupos de investigación pueden intercambiar datos para verificar sus modelos e incluso establecer referencias formales para la verificación y validación de los modelos, como la descrita en (Craik et al 2004). Esta publicación incluye resultados de pérdida de transmisión, orientados al uso del SEA, para varios tipos de uniones de placas semi-infinitas, isótropas, delgadas y planas que soportan ondas de flexión, longitudinales y transversales en el plano.…”

Section: Caracterización De La Transmisión Indirecta Estructural O Pounclassified

“…También los modelos analíticos necesitan procedimientos de validación, tal y como se pone de manifiesto en (Craik et al 2004) El problema de la validación del software de simulación acústica fue puesto de manifiesto por Molares y Sobreira-Seoane (2008). En esta comunicación se propone un problema de referencia (benchmark), consistente en un casquete esférico vibrante sobre una esfera rígida, para medir la precisión y rendimiento de programas de simulación de campos sonoros.…”

Section: Verificación Y Validaciónunclassified

“…Por un lado, la diferencia de nivel transmitido por flancos normalizado ( Nos centraremos en la determinación de , con excitación estructural, para la caracterización de la transmisión indirecta estructural o por flancos.En muchos trabajos de investigación, la transmisión estructural de vibraciones, a través de la unión de dos o más placas, se evalúa mediante el factor de transmisión, , definido como la relación entre la potencia transmitida a través de la unión y la potencia incidente sobre ella.Puede expresarse en dB mediante el índice de reducción acústica, (Ec. 130)(Craik et al 2004).…”

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Simulación numérica de la transmisión indirecta estructural y de la transmisión del ruido de impactos en edificios

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Structural transmission at line junctions: a benchmarking exercise

Cited by 6 publications

References 2 publications

Discrete flow mapping: transport of phase space densities on triangulated surfaces

Discrete flow mapping: transport of phase space densities on triangulated surfaces

Dynamical energy analysis on mesh grids: A new tool for describing the vibro-acoustic response of complex mechanical structures

Simulación numérica de la transmisión indirecta estructural y de la transmisión del ruido de impactos en edificios

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