muffler
Applied Acoustics 74 (2013) 1499–1510
Contents lists available at SciVerse ScienceDirect
Applied Acoustics journal homepage: www.elsevier.com/locate/apacoust
Transmission loss analysis of single-inlet/double-outlet (SIDO) and double-inlet/single-outlet (DISO) circular chamber mufflers by using Green’s function method
Subhabrata Banerjee, Anthony M. Jacobi ⇑
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL-61801, USA
a r t i c l e
i n f o
Article history:
Received 31 July 2012
Received in revised form 6 June 2013
Accepted 17 June 2013
Keywords:
Expansion-chamber mufflers
Transmission loss
Green’s function
a b s t r a c t
A Green’s function solution method is implemented to study sound attenuation in single-inlet/ double-outlet (SIDO) and double-inlet/single-outlet (DISO) circular chamber mufflers. The mufflers are modeled as piston driven rigid circular chambers containing a stationary fluid. The pistons are assumed to perform simple harmonic motion with uniform velocities. Velocity potential in the chamber is derived as a superposition of three dimensional velocity potential due to each piston. Pressure field in the chamber is calculated from the velocity potential through conservation of linear momentum equation. Acoustic pressure acting on each piston is calculated by averaging over the surface of the piston. Transmission loss (TL) is evaluated from incident and transmitted acoustic energy. TL curves for various inlet/outlet orientations derived from this method is validated with results obtained from the literature. The effect of locations of inlet/outlet on TL is studied.
Ó 2013 Elsevier Ltd. All rights reserved.
1. Introduction
Expansion chamber mufflers are widely used in automotive systems, HVAC ducts, reciprocating compressors and in other industrial systems. Sound attenuation in such mufflers is strongly dependent on geometry as well as on the orientation of
Contents lists available at SciVerse ScienceDirect
Applied Acoustics journal homepage: www.elsevier.com/locate/apacoust
Transmission loss analysis of single-inlet/double-outlet (SIDO) and double-inlet/single-outlet (DISO) circular chamber mufflers by using Green’s function method
Subhabrata Banerjee, Anthony M. Jacobi ⇑
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL-61801, USA
a r t i c l e
i n f o
Article history:
Received 31 July 2012
Received in revised form 6 June 2013
Accepted 17 June 2013
Keywords:
Expansion-chamber mufflers
Transmission loss
Green’s function
a b s t r a c t
A Green’s function solution method is implemented to study sound attenuation in single-inlet/ double-outlet (SIDO) and double-inlet/single-outlet (DISO) circular chamber mufflers. The mufflers are modeled as piston driven rigid circular chambers containing a stationary fluid. The pistons are assumed to perform simple harmonic motion with uniform velocities. Velocity potential in the chamber is derived as a superposition of three dimensional velocity potential due to each piston. Pressure field in the chamber is calculated from the velocity potential through conservation of linear momentum equation. Acoustic pressure acting on each piston is calculated by averaging over the surface of the piston. Transmission loss (TL) is evaluated from incident and transmitted acoustic energy. TL curves for various inlet/outlet orientations derived from this method is validated with results obtained from the literature. The effect of locations of inlet/outlet on TL is studied.
Ó 2013 Elsevier Ltd. All rights reserved.
1. Introduction
Expansion chamber mufflers are widely used in automotive systems, HVAC ducts, reciprocating compressors and in other industrial systems. Sound attenuation in such mufflers is strongly dependent on geometry as well as on the orientation of
References: international congress on sound and vibration, Stockholm, Sweden. 7–10 July, 2003, 3287–3294.