A statistical design optimization study of a multi-chamber reactive type silencer using simplex centroid mixture design

Abstract

This study aims to optimize the acoustic performance of a silencer with baffles having extension tubes. It considers the position, the number and the extension geometry of the baffles as design variables and sound transmission loss as the response variable to be optimized. The finite element analysis software ABAQUS is used to compute the response values for different combinations of design variables. The statistical design of the experiments provides a mathematical framework for such computer design optimization studies with multiple design variables. Yet, it has not been used for design optimization of silencers in the literature. In this study, simplex centroid mixture designs, a type of response surface method, are used in the statistical design of experiments. They can provide faster convergence on the optimization problem. The design involves one, two and three baffles with different positions and extension tube lengths. The outcome of this study indicates that obtaining ABAQUS software solutions at design points for each baffle number allows constructing nonlinear regression equations expressing the response variable as a function of the design variables. The equations obtained are then used to compute optimal values. Further evaluation of these equations indicates that better sound transmission loss values are obtained when the baffle number is increased, and the lengths of the extension tubes are set at high values. Moreover, it is possible to use the statistical experimental design approach implemented in this study for other types of silencers with different baffle geometries and design variables.

Role of End-Correction in Enhancing Transmission Loss Estimates in Case of Extended Inlet-Outlet Expansion Chamber Mufflers Using Simulation

“…Reactive muffler is one of the passive noise control devices used to control unavoidable noise; using destructive interference as a principle (1) . Wherever there is either sudden contraction or sudden expansion, the phase of the reflected wave changes causing destructive interference (2) . The reactive muffler is prone to generate backpressure, decreasing efficiency at times, and increasing fuel consumption (3) ; however, the reactive muffler is the perfect option for studying Transmission Loss at low frequency range (4) .…”

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

“…Xue et al applied U-shaped bellows to a resistant muffler, and the noise reduction performance was significantly improved in the cutoff frequency range [4]. Segin et al used the finite element analysis method to optimize the acoustic performance of a multi-chamber reactive silencer with baffles [5]. Sagar et al designed an H-type connecting fork muffler based on an H-Q tube.…”

Analysis of Composite Scrubber with Built-In Silencer for Marine Engines

“…The silencer is divided into a resonance type that focuses on sound wave synthesis, a vane type that induces dissipation and synthesis at the same time, and an expansion type that focuses on dissipation. Various studies are being conducted on the flow characteristics and acoustic characteristics according to the shape of the silencer for noise reduction [20][21][22][23][24][25][26][27]. Hwang et al [20] investigated the internal structure of the silencer, classified its components, and studied the noise and back pressure characteristics of the silencer.…”

“…Yi et al [23] studied the pressure loss through the internal flow analysis of a silencer for an 8 kW diesel generator. Secgin et al [24] studied the acoustic characteristics through computational analysis by changing the baffle position, number, and extension shape of the baffle in the expansion tube. Nursal et al [25] studied the flow characteristics according to the pipe shape and the position of the silencer of a 4-stroke marine diesel generator through computational analysis.…”