Dirk Vandepitte

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The finite element method (FEM) is widely accepted for the steady-state dynamic response analysis of acoustic systems. It exhibits almost no restrictions with respect to the geometrical features of these systems. However, its application is practically limited to the low-frequency range. An alternative method is the wave based method, which is an indirect(More)
The objective of this paper is to give a survey on the use of non-probabilistic methods for non-deterministic numerical analysis. It consists of a general theoretical discussion on the use of non-deterministic concepts in numerical analysis, an overview of the basic properties of possible implementations of the non-probabilistic finite element code, and(More)
This work aims at characterising some stochastic properties of heterogeneous composite fabric from a limited number of vibration tests. The frequency response functions, measured in these tests, are implemented in a deterministic inverse problem in order to construct a database consisting of spatial estimations of the Young's modulus of the composite(More)
This paper concerns with the design of an acoustic cavity (transmission suite) for the vibro-acoustic characterization of lightweight panels. This setup has the big advantage of being a small (1150x984x820 mm) which allows the identification of the studied behaviour for both structure-and airborne excitation, on panels of different size (from A4 to A2) and(More)
In a virtual prototyping context the importance of physical uncertainty modelling has become more evident. The increased computational performance over the last years enlarges the potential in the use of large models (more DOF's) and in the application of more advanced numerical methods. This results in more accurate models from the numerical point of view.(More)
In this paper an experimental-numerical approach is presented to tackle the vibro-acoustic characterization of composite sandwich structures. A novel experimental setup allows for fast and comprehensive understanding of the NVH behaviour of composite sandwich panels. This information can then be further exploited in numerical model updating and design tools(More)
A new prediction technique, based on the indirect Trefftz method, has been developed for the steady– state dynamic analysis of coupled vibro–acoustic systems. In contrast with the finite element method, in which the dynamic field variables within each element are expanded in terms of local, non–exact shape functions, the dynamic field variables are(More)