The interrelationships between the physical properties of fibrous duct lining materials and lined duct sound attenuation
In addition to their sound velocity, rubber compounds can also be characterized by their sound attenuation
coefficient [alpha] according to the Lambert-Beer Law (equation 2) (refs.
From the theoretical point of view, in the past, analytical methods (Cremer 1953; Ingard 1955; Kurze 1969) were used in order to theoretically evaluate sound attenuation
and to avoid expensive and time consuming experiments.
We also included robust sound attenuation
and premium permanent magnet generators for improved motor starting and load control.
Table 3 presents the values of the airborne sound attenuation
index DLR in decibels, calculated from the experimental results.
The range of exposures common to Navy and Marine Corps operations show that many exceed the level of sound attenuation
provided by currently available protective equipment.
Spaces that require certain sound attenuation
or special acoustics can also benefit from metal ceilings.
Its range includes general meshes as well as those for vibration control, sound attenuation
, sealing for harsh environments and EMI/RFI shielding.
Scapa North America now offers 2 acrylic transfer adhesives designed for sound attenuation
, vibration dampening, rubber extrusion mounting and general product assembly applications.
Additionally, JM is introducing three new products for the building market: DuraSpun XTR, a glass thread reinforced spunbond composite providing best-in-class dimensional stability to bituminous waterproofing membranes; Illuma White, a pre-coated glass fiber nonwoven for high-quality ceiling tiles; and the glass fiber nonwoven DHY Forte, an innovative product for impact sound attenuation
This application uses Bayer's Bayflex XGT-2 filled PUR elastomer system, which offers an extended gel time that facilitates large-part molding, as well as high density for sound attenuation
Configurations range from simple air knife kits to fully engineered systems incorporating stainless steel cabinets, drip trays, sound attenuation
and adjustable guides.
These individual filaments are what provide the sound attenuation
I immediately liked ACCES--the sound attenuation
seemed significantly higher, and, unlike the CEP, you can't screw up the installation of an ACCES earplug.
The sound attenuated pump provided more than adequate pumping, and was quiet enough not to disturb the local residents and businesses by providing sound attenuation
of less than 76-decibels at 50-feet.