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Acoustic baffle for deep submergence

阅读:44发布:2023-04-13

专利汇可以提供Acoustic baffle for deep submergence专利检索,专利查询,专利分析的服务。并且A multi-layered acoustic baffle, particularly useful at great depths, comprising at least two layers of fume-produced silicon dioxide, the particle size being between 70 to 500 angstroms, the particles being sintered together in chain-like formations and having surface areas of 50 m2/g to 400 m2/g; each of the layers being prestressed to a pressure greater than the pressure at which the baffle is to be used; and each of the layers having a thickness not greater than 1/4 wavelength of the highest frequency of interest in the material. At least one layer of high-density, viscoelastic, material having a high acoustic shear loss coefficient is sandwiched in between each layer of the silicon dioxide. The baffle further comprises two layers of a compliant watertight coating bordering the two outer layers of silicon dioxide and the sides of the baffle, thereby completely enclosing the other layers.,下面是Acoustic baffle for deep submergence专利的具体信息内容。

1. A MULTI-LAYERED ACOUSTIC BAFFLE, PARTICULARLY USEFUL AT GREAT DEPTHS, COMPRISING: AT LEAST TWO LAYERS OF FUME-PRODUCED SILICON DIOXIDE, THE PARTICLE SIZE BEING BETWEEN 70 TO 500 ANGSTROMS, THE PARTICLES BEING SINTERED TOGETHER IN CHAIN-LIKE FORMATIONS AND HAVING SURFACE AREAS OF 50 M2/G TO 400 M2/G; EACH OF THE LAYERS BEING PRESTRESSED TO A PRESSURE GREATER THAN THE PRESSURE AT WHICH THE BAFFLE IS TO BE USED; AND EACH OF THE LAYERS HAVING A THICKNESS NOT GREATER THAN 1/4 WAVELENGTH OF THE HIGHEST FREQUENCY OF INTEREST IN THE MATERIAL; AT LEAST ONE LAYER OF HIGH-DENSITY, VISCOELASTIC MATERIAL HAVING A HIGH ACOUSTIC SHEAR LOSS COEFFICIENT, SANDWICHED IN BETWEEN EACH LAYER OF THE SILICON DIOXIDE; AND A LAYER OF A COMPLIANT WATERTIGHT COATING BORDERING THE TWO OUTER LAYERS OF SILICON DIOXIDE AND THE SIDES OF THE BAFFLE, THEREBY COMPLETELY ENCLOSING THE OTHER LAYERS.
2. The acoustic baffle according to claim 1, wherein the high-density viscoelastic material comprises a composition, prior to vulcanization, of milled and compounded rubber containing organosilicon polymers.
3. The acoustic baffle according to claim 2, wherein the compliant watertight coating comprises neoprene.
4. The acoustic baffle according to claim 3, wherein the layers of silicon dioxide and of viscoelastic material are very thin, with respect to the highest frequency of interest, while maintaining the total thickness of the baffle constant, so that in the limit the layers approach zero thickness and the baffle may now be considered to be made of a uniform material.
5. The acoustic baffle according to claim 3, further comprising: a phenolic binder within which the finely divided silica particles are mixed, the mixture of the silica particles and the phenolic binder being prestressed into a desired form.
6. The acoustic baffle according to claim 4, further comprising: a phenolic binder within which the finely divided silica particles are mixed, the mixture of the silica particles and the phenolic binder being prestressed into a desired form.
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