## A BS TRA C T A method has been previously worked out by one of the authors, to measure the surface impedance of glasswools and plastic foams in normal and oblique incidence, in free field, with two microphones. Using an improved version of this method, surface impedance measurements of two soun
The effect of surface treatment on sound-absorbing materials
β Scribed by A.J. Price; K.A. Mulholland
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 246 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0003-682X
No coin nor oath required. For personal study only.
β¦ Synopsis
Measurements of the effect of paint finishes on the acoustic absorption properties of a number of surfaces suitable for use as sound absorbers are reported. It is shown that in no case does the paint fail to alter the absorption characteristics of the sulface. In the case of materials having open pores on their surfaces the effect is particularly harmful.
In these cases it is recommended that the surfaces be first covered with perforated board which can enhance the acoustic properties and which provides a sulface which will take paint without the acoustic properties being affected.
π SIMILAR VOLUMES
## Abstract Preliminary experiments suggest pretreatment of absorbable crystalline, calciumβsodiumβmetaphosphate (CSM) microfibers with trimethoxyβbased silane coupling agents yields a polysiloxane film barrier which protects the fiber surface from early dissolution due to water. Compared to thermo
To those targets partially coated by radar-absorbing materi-( ) als RAM , the effect of absorbing materials on RCS is an important ( ) subject in engineering. According to physical optics PO approximation and electromagnetic theory, the effect of RAM on RCS of both simple and complex partially coate
This paper reports the effect of surface chlorination, oxidation, and phosphatization of carbon steel, copper, and aluminum, and surface treatment with sodium naphthalenide of PTFE on wear of PTFE. It was found that the wear behavior of untreated PTFE is not affected by surface treatments of metals