Acoustical ceramic panel and method
AssigneeLockheed Missiles & Space Company, Inc.
InventorsRobert Deane Yasukawa, James Perry Woolley, Venecia M. Grobelny
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Abstract
A rigid acoustic insulator panel for use as a sound insulator is disclosed. The panel is composed of a rigid matrix formed of randomly oriented, fused silica fibers having fiber diameters predominantly in the range between 0.5 and 2 .mu.m. The matrix has a three-dimensionally continuous network of open, intercommunicating voids, and a density of between about 2 and 6 lb/ft.sup.3. In one embodiment, the panel has greater flow resistance characteristics, progressing from a sound-absorbing side of the matrix to the opposite panel side. Also disclosed is a method of preparing the panel.
Claims19
A rigid acoustic insulator panel for use as a sound barrier comprising
- a rigid matrix defining a sound-absorbing panel side and a back side,
- said matrix (i) being formed of randomly oriented, fused silica fibers having fiber diameters predominantly in the range between 0.5 and 2 .mu.m, (ii) having a three-dimensionally continuous network of open, inter-communicating voids, and (iii) having a density of between about 2 and 6 lb/ft.sup.3.
A sound-absorbing panel for use as a sound barrier, comprising
- a rigid matrix of randomly oriented, fused silica fibers which form a three-dimensionally continuous network of open, intercommunicating voids, with a matrix density of between about 2 and 6 lb/ft.sup.3,
- said matrix having a sound-absorbing sublayer (i) whose flow resistance is between about 20-100K rayls/m, and
- a backing sublayer whose fiber sizes are predominantly in the 0.5 to 2 .mu.m diameter size range, and (ii) whose flow resistance is at least 50% greater than that of the sound-absorbing sublayer.
A method for reducing the level of sound entering a compartment, such as a vehicle or aircraft compartment, from an external sound source, comprising
- shielding the compartment with one or more panels, each composed of a rigid matrix defining a sound-absorbing panel side placed to confront the external sound source, and an opposite back side, where the matrix (i) is formed of randomly oriented, fused silica fibers having fiber diameters predominantly in the range between 0.5 and 2 .mu.m, (ii) has a three-dimensionally continuous network of open, intercommunicating voids, and (iii) has a density of between about 2 and 6 lb/ft.sup.3.
Dependencies are inferred from the claim text.