Reflection, Transmission and Coupling of Longitudinal and Flexural Waves at Beam Junctions. Part I: Measurement Methods
This paper presents measurement methods for the scattering matrix terms of beam junctions. The case of flexural and longitudinal waves travelling on prismatic beams and interacting with a structural discontinuity is considered. Reflection, transmission and wave coupling coefficients
between these two waves are obtained from structural response functions measured by in-plane and out-of-plane laser vibrometers. Three measurement methods are developed and compared. They are based on different sets of assumptions for the junction: geometrical axial symmetry, reciprocity and
conservation of the energy. The third method is iterative and is the most efficient way to obtain all coefficients: reflection and transmission coefficients are first estimated ignoring the wave coupling coefficients, which are computed in a second step. The measured coefficients are used
to determine stiffness parameters of the junctions which are key parameters to predict response functions of beam assemblies using a wave superposition method.
Document Type: Research Article
Publication date: 01 November 2006
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