Proceedings of the 9th National Conference on Theoretical and Applied Mechanics (NCTAM 2012)
National Conference on Theoretical and Applied Mechanics (NCTAM 2012) edition:9 location:Brussels date:9-10 May 2012
The presented paper focuses on a combined approach, using a new type of measurement setup, which has been specifically developed for examining the vibro-acoustic behaviour of lightweight panels and the Wave Based Method (WBM) for the numerical simulation of vibro-acoustic problems.
The setup consists of a concrete cavity of 0.83 m³ which can host test specimens of variable size and thickness. It allows for both structural and acoustical excitation and measurement acquisition. Among others, the vibro-acoustic Insertion Loss (IL) of a test sample can be measured over a wide frequency range, accounting for the acoustic cavity modal behaviour, which is realistic in many real-life applications. The WBM, a novel technique for steady-state vibro-acoustic simulation, is adopted for efficient virtual characterisation of the considered setup. The WBM has a superior convergence behaviour as compared to state of the use techniques such as the Finite Element Method, given a low geometrical complexity of the problem, which is the case for the test box at hand. This increased convergence rate makes the technique applicable for a broader frequency range.
The combination of the versatility of this test setup and the efficiency of the Wave Based Method (WBM) shows promising results for the characterisation of materials.