| Summary: | The nature of sound in cars is discussed in the light of previous
experimental and theoretical work, and the major contributions to
interior noise are identified. The acoustic field inside a
vibrating structure is analysed theoretically in terms of the
acoustic cavity modes and the structural modes, and it is shown
that'reduction of structural-acoustic coupling could reduce the
response for a wide variety of force inputs. Finite element
analyses of prismatic acoustic cavities and two-dimensinal ring
structures are described and these are combined
in a simple
theoretical model of ring-mode excitation of sound. By
stiffening selected structural elements, the structural-acoustic
coupling, and hence the acoustic response, are reduced.
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