Abstract
The flow-resistance of a material is highly important as a factor in determining its acoustical performance in various applications, particularly in the blankets used for sound-proofing of aircraft cabins. It is desirable, therefore, to know the manner in which the flow-resistance of a light-weight acoustical material varies with such physical parameters as thickness, density, size, and shape of fibers, and type of construction (“felting”) of the material. From an experimental study of a large number of fibrous acoustical materials, the following general empirical relation has been established: Flow-resistance, R = KS(1 + x)Tx(av)2 where K is a constant characteristic of a particular material, S is the surface density of the blanket of material, T is the thickness, and (a/v) is the ratio of surface area of the fibers to the volume of the fibers. The type of construction of the material determines the value of x in the exponents. This relation is compared with the theoretical relation derived by Fowler and Hertel for samples with randomly oriented fibers.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
