GB887535A - High acoustic-energy transmission-loss panel and the like - Google Patents
High acoustic-energy transmission-loss panel and the likeInfo
- Publication number
- GB887535A GB887535A GB44238/59A GB4423859A GB887535A GB 887535 A GB887535 A GB 887535A GB 44238/59 A GB44238/59 A GB 44238/59A GB 4423859 A GB4423859 A GB 4423859A GB 887535 A GB887535 A GB 887535A
- Authority
- GB
- United Kingdom
- Prior art keywords
- panel
- masses
- elements
- type
- absorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
Abstract
887,535. Modifying acoustic properties of rooms. BOLT, BERANEK & NEWMAN Inc. Dec.30, 1959 [March 6, 1959], No. 44238/59. Class 13. [Also in Group XL (b)] In a sound-absorbing panel, a fairly level absorption frequency characteristic, due to increased absorption at low frequencies, is obtained by loading the non- porous, resilient, panel with masses, so distributed, that their mean separation is less than the wavelengths corresponding to the frequencies which it is desired to absorb. The panel 1 (Fig. 1), may be made of plastic or metal foil and the masses 3 may be lead weights whose separation is small compared with the relevant wavelengths. The masses act as mass-type impedance _elements effectively connected in parallel with the stiffness (compliance)-type elements of the intervening and supporting panel elements 1<SP>1</SP>, this giving rise to a resonance frequency (maximum absorption) when the net motion of the two elements is effectively zero. The masses may be of unequal weight and distribution (Fig. 2, not shown), they may project on both sides of the panel (Fig. 3, not shown), they may be integral with it (Fig. 6, not shown), or they may be in the form of glass beads on a curtain type of panel (Fig. 4, not shown). The panel may be double-walled, with a honeycomb structure between the walls, masses being placed in some of the compartments (Fig. 7, not shown); it may also have portions of itself of higher density than the rest, these portions acting as the masses.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US887535XA | 1959-03-06 | 1959-03-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB887535A true GB887535A (en) | 1962-01-17 |
Family
ID=22213242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB44238/59A Expired GB887535A (en) | 1959-03-06 | 1959-12-30 | High acoustic-energy transmission-loss panel and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB887535A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009059113A1 (en) * | 2007-10-31 | 2009-05-07 | E. I. Du Pont De Nemours And Company | Vibration absorber |
US9222229B1 (en) | 2013-10-10 | 2015-12-29 | Hrl Laboratories, Llc | Tunable sandwich-structured acoustic barriers |
-
1959
- 1959-12-30 GB GB44238/59A patent/GB887535A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009059113A1 (en) * | 2007-10-31 | 2009-05-07 | E. I. Du Pont De Nemours And Company | Vibration absorber |
US8025124B2 (en) | 2007-10-31 | 2011-09-27 | E. I. Du Pont De Nemours And Company | Broadband passive distributed tuned vibration and acoustic absorber for modally dense structures |
US9222229B1 (en) | 2013-10-10 | 2015-12-29 | Hrl Laboratories, Llc | Tunable sandwich-structured acoustic barriers |
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