Transmission Loss of a Dissipative Perforated Muffler
Transmission Loss of a Dissipative Perforated Muffler
Transmission Loss of a Dissipative Perforated Muffler
Transmission Loss of a Dissipative Perforated Muffler
Transmission Loss of a Dissipative Perforated Muffler

In this example, the transmission loss of a dissipative perforated muffler is evaluated using Coustyx. The expansion chamber of the dissipative muffler is filled with fiber glass roving porous material. The air flow in the central pipe is separated from the porous material using perforated pipe. A multiDomain Coustyx model with two domains, one with fiber glass and another with air is modeled. The fiber glass material is modeled as an equivalent fluid with complex sound speed and complex effective density from empirical laws. The perforated interface is modeled using transfer impedance formulae obtained from analytical or empirical relations. Several model cases are examined with different porous material models and perforated interface models. Coustyx solution is validated against published experimental measurements in Lee, I.-J., et al. [1].

In this example, the transmission loss of a dissipative perforated muffler is evaluated using Coustyx. The expansion chamber of the dissipative muffler is filled with fiber glass roving porous material. The air flow in the central pipe is separated from the porous material using perforated pipe. A multiDomain Coustyx model with two domains, one with fiber glass and another with air is modeled. The fiber glass material is modeled as an equivalent fluid with complex sound speed and complex effective density from empirical laws. The perforated interface is modeled using transfer impedance formulae obtained from analytical or empirical relations. Several model cases are examined with different porous material models and perforated interface models. Coustyx solution is validated against published experimental measurements in Lee, I.-J., et al. [1].

In this example, the transmission loss of a dissipative perforated muffler is evaluated using Coustyx. The expansion chamber of the dissipative muffler is filled with fiber glass roving porous material. The air flow in the central pipe is separated from the porous material using perforated pipe. A multiDomain Coustyx model with two domains, one with fiber glass and another with air is modeled. The fiber glass material is modeled as an equivalent fluid with complex sound speed and complex effective density from empirical laws. The perforated interface is modeled using transfer impedance formulae obtained from analytical or empirical relations. Several model cases are examined with different porous material models and perforated interface models. Coustyx solution is validated against published experimental measurements in Lee, I.-J., et al. [1].

In this example, the transmission loss of a dissipative perforated muffler is evaluated using Coustyx. The expansion chamber of the dissipative muffler is filled with fiber glass roving porous material. The air flow in the central pipe is separated from the porous material using perforated pipe. A multiDomain Coustyx model with two domains, one with fiber glass and another with air is modeled. The fiber glass material is modeled as an equivalent fluid with complex sound speed and complex effective density from empirical laws. The perforated interface is modeled using transfer impedance formulae obtained from analytical or empirical relations. Several model cases are examined with different porous material models and perforated interface models. Coustyx solution is validated against published experimental measurements in Lee, I.-J., et al. [1].

In this example, the transmission loss of a dissipative perforated muffler is evaluated using Coustyx. The expansion chamber of the dissipative muffler is filled with fiber glass roving porous material. The air flow in the central pipe is separated from the porous material using perforated pipe. A multiDomain Coustyx model with two domains, one with fiber glass and another with air is modeled. The fiber glass material is modeled as an equivalent fluid with complex sound speed and complex effective density from empirical laws. The perforated interface is modeled using transfer impedance formulae obtained from analytical or empirical relations. Several model cases are examined with different porous material models and perforated interface models. Coustyx solution is validated against published experimental measurements in Lee, I.-J., et al. [1].

References

  1. I.-J. Lee, A. Selamet, and N. T. Huff, Acoustic impedance of perforations in contact with fibrous material, J. Acoust. Soc. Am., 119:2785-2979, 2006

Downloads:

Download the latest version of Coustyx. Compute transmission loss of the dissipative perforated muffler by running demo model DemoModel. Demo models contain embedded trial licenses valid only for those models. Install Coustyx first to run a Demo Model.