Design Optimization of Close-Fitting Free-Standing Acoustic Enclosure Using Jaya Algorithm

Abstract

One of the ways by which the noise can be reduced is by enclosing the noise source. In this chapter, domestic mixer grinder assembly is considered as a single unit. The only source of noise, acoustical enclosure of rectangular shape, is designed having its length and height fixed so that the enclosure closely fits the grinder. Enclosure width is controlled, i.e., the thickness of hood and grinder to panel distance, so as to get large insertion loss (IL). A design procedure for acoustical enclosure is proposed. Geometrical parameters such as panel thickness and source to panel distance are optimized as the function of IL by using Jaya algorithm. For this, the previously established mathematical model for the prediction of IL is used. Experimentation is then carried out in free-field environment to obtain the IL and variation of sound pressure level. The predicted and experimental results are then compared. The results match appreciably in lower frequencies and the trend matches quite well over the entire one-third octave band, suggesting that the model used is good predictor of IL. The total noise reduction by enclosing the sound source is found to be 17.19 dBA, which comes to 18.95% noise reduction. This approach can be used to design an enclosure for a given sound source within the material/dimensional limits specified.