Structural-acoustic coupling of circular membrane backed by cylinder cavity using mode coupling approach

Amogh, R N and Mahanta, T K and B, Venkatesham (2016) Structural-acoustic coupling of circular membrane backed by cylinder cavity using mode coupling approach. In: 2nd Australasian Acoustical Societies Conference, ACOUSTICS, 9-11, November 2016, Brisbane; Australia.

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Abstract

Circular membrane backed by cylinder cavity configuration has encountered in various acoustical applications such as musical instruments, automotive horns, sensors and loud speaker design. Vibration Characteristics of membrane are important in understanding sound radiation behavior. Natural frequencies of membrane are influenced by the presence of acoustic cavity, and this interaction is named as structural-acoustic coupling. The coupled natural frequencies of the membrane are predicted using Mode Coupling approach. In this approach, the coupled system behaviour is expressed in terms of the finite number of uncoupled sub-system modes. Acoustic impedances of cavity and structural mobility of membrane are arranged in a matrix form. The matrix representation helps to do efficient computations. It also helps to find modes participation in coupling. The predicted results are corroborated with numerical results.

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