Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1995-08-03
1997-08-19
Ryan, Patrick
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
181198, 181212, 181264, 181286, 181288, 4283073, 4283084, 4283122, 4283155, 428406, 4284111, B32B 326, E04B 182
Patent
active
056586566
ABSTRACT:
A method of using a material as an acoustical barrier in an ambient medium. The material comprises microbubbles having average outer diameters of 5 to 150 microns, bound together at their contact points. The material is characterized by either a porosity of 20 to 60 percent, or by voids between the microbubbles which have characteristic diameter within an order of magnitude of the viscous skin depth of the ambient medium, as calculated at 1 kHz; an air flow resistivity of 0.5.times.10.sup.4 to 4.times.10.sup.7 mks rayls/meter, and an attenuation of sound comparable to mass law performance. The microbubbles can be sintered into direct contact with each other, or one of many types of binder material can be used to support the microbubbles within a composite material. The method may be practiced in an acoustical system comprising a sound source and the material, such as by placing a muffler comprising the material substantially in a direct path of a fluid; and also in applications requiring high specific stiffness and flexural strength.
REFERENCES:
patent: 2720276 (1955-10-01), Droeger
patent: 2806509 (1957-09-01), Bozzacco et al.
patent: 2985411 (1961-05-01), Madden, Jr.
patent: 3132956 (1964-05-01), Lewis
patent: 3608010 (1971-09-01), Stayner
patent: 3898063 (1975-08-01), Gazan
patent: 3989534 (1976-11-01), Plunguian et al.
patent: 4079162 (1978-03-01), Metzger
patent: 4146112 (1979-03-01), Usry
patent: 4238641 (1980-12-01), Planting et al.
patent: 4463049 (1984-07-01), Kracke et al.
patent: 4465159 (1984-08-01), Stallings
patent: 4528305 (1985-07-01), Henry
patent: 4528652 (1985-07-01), Horner et al.
patent: 4548863 (1985-10-01), Hicks et al.
patent: 4788230 (1988-11-01), Mudge
patent: 4816618 (1989-03-01), Bongianni
patent: 5187461 (1993-02-01), Brommer et al.
patent: 5504281 (1996-04-01), Whitney et al.
"Scotchcast.TM. Electrical Resins", 3M Electrical Specialties Division, 1990.
"Measurement and Calculation of Acoustic Propagation Constants in Arrays Air-Filled Rectangular Tubes", Heui-Siol Roh, W. Patrick Arnott, and James M. Sabatier, Journal of the Acoustical Society of America, vol. 89 (6), Jun. 1991.
Dolezal Michael W.
Gerdes Ronald W.
Harvieux Gary N.
Mandell Joseph G.
Marttila Charles A.
Dowdall Janice L.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Ryan Patrick
LandOfFree
Use of materials comprising microbubbles as acoustical barriers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Use of materials comprising microbubbles as acoustical barriers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Use of materials comprising microbubbles as acoustical barriers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1103224