Resumen

RASTELLI, Victoria H et al. Automatic design of reactive mufflers: performance analysis: Part I. Rev. Fac. Ing. UCV [online]. 2008, vol.23, n.2, pp.95-101. ISSN 0798-4065.

Uncontrolled urban development has led to a considerable increase in noise pollution, mainly caused by automobile traffic and industrial activity. This pollution impacts negativey on human beings both physiologically as well as psychologically. Several solutions to the problem of reducing noise levels have included mufflers, which can be absorptive and reactive, according to their working principles. In this study, the design of reactive mufflers, which are commonly used to reduce the noise contamination of systems that involve gas flow, is studied. This design process is relatively large and iterative; therefore, in the first part of this work, a computational tool to carry out that calculus is developed. This tool, named PADSA, is user friendly and was used to analyze and concluded about the simple chamber muffler perform, leaving to the second part of this work the analysis for the double chamber mufflers. As some of these conclusions, the followings can be mentioned. An area relationship increase causes a transmission losses rise, with no change on the frequency occurrence of the maximum and minimum values. A chamber longitude increase modifies the frequency occurrence of the maximum and minimum values with no modification of the transmission losses magnitude. The muffler longitudes can be optimizing in order to achieve maximum losses with minimal longitudes. Finally, a temperature increase produce a phase modification in the transmission losses curve, which affect the muffler perform.

Palabras clave : Mufflers; Reactive; Automatic design; Sensitivity; Noise contamination.