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The IUP Journal of Mechanical Engineering

Hybrid Muffler Transmission Loss Performance: A Wave 1D Approach

Article Details

Pub. Date	: May, 2023
Product Name	: The IUP Journal of Marketing Management
Product Type	: Article
Product Code	: IJMM020523
Author Name	: Ravi Jatola and Amit Kumar Gupta
Availability	: YES
Subject/Domain	: Marketing
Download Format	: PDF Format
No. of Pages	: 10

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Abstract

The paper focuses on the acoustic performance analysis of several absorptive mufflers types, in terms of Insertion Loss (IL), Transmission Loss (TL), Level Difference (LD) and Noise Reduction (NR); the performance of the muffler is also assessed. One of the key variables frequently employed for acoustic performance measurement of mufflers is TL. The study reviews the absorptive materials and TL prediction by wave 1D tool. The amount of TL transmitted within a muffler is calculated by wave 1D. The combination of both reactive and absorptive muffler is termed hybrid muffler. It is reasonable to anticipate that the hybrid muffler design will offer low pressure drop and broadband high noise attenuation. The TL of the hybrid muffler can be predicted using the load setup of experimental two-load method and wave 1D.

Introduction

A muffler and its acoustic performance can be described by a number of factors, such as Transmission Loss (TL), Insertion Loss (IL) and Noise Reduction (NR). The difference in sound pressure level across the silencer is known as NR. Despite being easy to measure, NR is not very helpful for designing mufflers. IL is the difference in sound pressure level between a point with and without a silencer, which is typically outside of the system (Munjal, 1987). Although IL is very helpful to the industry, it is difficult to calculate because it depends on source impedance and radiation impedance, in addition to muffler design itself.TL, which is a unique characteristic of the muffler, is the difference in sound power level between the transmitted wave leaving the muffler and the transmitted wave entering it when the muffler termination is anechoic. Although it is challenging to measure, the muffler's TL can be calculated using models. Measuring the mufflers TL is the main objective of the study.