Browsing by Subject "noise control"

Now showing 1 - 4 of 4

Access status: Open Access ,
Sound absorbing materials from recycled rubber products
(2013) Turkiewicz, Jadwiga; Sikora, Jan
This paper concerns the results of comparative research into the acoustical properties of rubber granulates derived from the recycling of conveyor belts production waste. In the process of recycling it is possible to obtain pure granulated rubber and forms contaminated with cotton fibres with a predominance of rubber grains or of cotton fabric. Rubber granulate in the contaminated form is characterized by sound-absorbing properties similar to those of the average-quality mineral wool and other fibrous materials. It can be used as the core of sound-absorbing panels in anti-noise protections. The research results can be used both in the design of acoustical protection as well as in the course of the recycling process of other waste products for obtaining materials with sound absorbing properties.
Access status: Open Access ,
Sound absorption coefficients of granular materials
(2010) Sikora, Jan; Turkiewicz, Jadwiga
This paper presents the results of the expanded research program on sound absorbing properties of granular materials (granular polypropylene, foamed polystyrene, gravelite, rubber, mineral wool, and high-silica sand) being often applied as sound absorbing cores in double-wall partitions of constructions limiting noises of machines and devices.
Access status: Open Access ,
The method of application of SEA in structural design process for reducing structure-borne noise in machinery. Part 1, General procedure
(Wydawnictwa AGH, 2009) Yamazaki, Toru; Kuroda, Katsuhiko
The paper focuses on the finding which parts of machinery should be modified in order to reduce the noise. The countermeasure is decided by being based on the theoretical formulation the statistical energy analysis (SEA). The proposed process is applied to determine the countermeasures to structure-borne noise in a commercial product (A4 laser printer). This study is the first report of a series to develop a process based on the SEA.
Access status: Open Access ,
The method of application of SEA in structural design process for reducing structure-borne noise in machinery. Part 2, Structural optimization of subsystems
(Wydawnictwa AGH, 2009) Kuroda, Katsuhiko; Kuratani, Fumiyasu|Yamazaki, Toru
This paper presents the formulation of the structural optimization method on the basis of statistical energy analysis. A4 laser beam printer consisting of eight finite elastic steel plates is considered as an example, where the mass is taken as a constraint function. Consequently, taking one CLF as the objective function, an optimization of the thickness of the shell elements is performed showing the efficiency of the structural optimization method.