초록 ▼

Acoustic device including a member extending transversely of its thickness and capable of sustaining bending waves at least over an intendedly consequentially acoustically active area of the transverse extent of said member, the member having, by reason of orderly design methodology disclosed and cl

Acoustic device including a member extending transversely of its thickness and capable of sustaining bending waves at least over an intendedly consequentially acoustically active area of the transverse extent of said member, the member having, by reason of orderly design methodology disclosed and claimed, a distribution of resonant modes of its natural bending wave vibration at least over said area that is dependent on values of particular parameters of said members, including geometrical configuration and directional bending stiffness(es), which values have been selected to predetermine said distribution of natural resonant modes being consonant with required achievable acoustic action of said member for operation of said device over a desired operative acoustic frequency range.

대표청구항 ▼

[ What is claimed is:] [1.]1. An acoustic device adapted for operation over an operative frequency range of interest, comprising:a substantially rectangular member extending transversely of its thickness and capable of sustaining bending waves at least over an intendedly active area of the transvers

[ What is claimed is:] [1.]1. An acoustic device adapted for operation over an operative frequency range of interest, comprising:a substantially rectangular member extending transversely of its thickness and capable of sustaining bending waves at least over an intendedly active area of the transverse extent of the member, the member having certain physical parameters the values of which affect the distribution of resonant modes of bending wave vibration over the active area of the member, said parameters having selected values such that the resonant bending wave modes are beneficially distributed in frequency over the active area of the member so that the member is a well-behaved acoustic element when vibrating in the frequency range of interest, wherein the member has a cellular core having a shear modulus of at least about 10 megapascals, and a skin having a Young's modulus of at least about 1 gigapascal, anda transducer coupled to the member in a region of the active area of the member where a plurality of lower frequency resonant bending wave modes in the operative frequency range of interest have vibrationally active anti-nodes so that the transducer will couple with the resonant bending wave modes.