What is it about?

This paper presents a "see-through" technology to reveal the characteristics of the excitation force acting behind a structure based on the acoustic pressures measured in front of this vibrating structure. Specifically, it enables one to identify the unknown excitation forces in terms of the amplitudes, locations and types, such as point forces, line forces, distributed forces, or their arbitrary combination, which are acting behind a structure.

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Why is it important?

Excitation forces are the root causes of all vibration and noise issues. To reduce undesirable sound and vibration, it is imperative to understand their root causes, namely, the excitation forces. Unfortunately, they cannot be measured directly and are often hidden behind or inside a structure. The existing technologies for analyzing excitation forces are measurement based. These approaches are ad hoc in nature and results are valid at certain discrete measurement points only. Even so, users cannot get a holistic view of the excitation forces.

Perspectives

This paper demonstrates that the excitation forces hidden behind or inside an excitation structure can be reconstructed based on the acoustic pressure signals collected in front of the structure, given the geometry, dimensions and bound conditions of the target structure.

Sean Wu
Wayne State University

Read the Original

This page is a summary of: Analyzing excitation forces acting on a plate based on measured acoustic pressure, The Journal of the Acoustical Society of America, July 2016, Acoustical Society of America (ASA),
DOI: 10.1121/1.4955284.
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