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Experimental Acoustic Analysis of the Intake and Exhaust System to Predict Insertion Loss and Engine Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 01, 1993 by SAE International in United States
Annotation ability available
The pulsations in the intake and exhaust systems affect both the intake and exhaust noises and the engine torque. The pulsations are mainly dominated by the standing waves, which are expressed by the acoustic characteristics. From this point of view, authors have developed an experimental method to analyze the standing wave and the acoustic transfer matrix, which is characterized as the four-pole parameters of the air column in an intake and exhaust system.
In this paper, the intake and exhaust noises are predicted with the insertion loss based on the experiment. By using this method, first the experimental transfer matrix of each sub-system is obtained, then that of a whole system is superimposed from a combination of sub-systems. A proper combination of experimental transfer matrices and calculation ones enables to simulate the insertion loss with accuracy and efficiency. The engine torque is predicted by referring the standing waves which indicate the in-phase and 180 ° out-of-phase modes related to the pulsation types.
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CitationKurata, K. and Miyake, K., "Experimental Acoustic Analysis of the Intake and Exhaust System to Predict Insertion Loss and Engine Performance," SAE Technical Paper 931903, 1993, https://doi.org/10.4271/931903.
- Fujimoto S. Experiment on Exhaust Muffler by Pulsating Air Flow J. Acoustic Soc. of Japan 27 11 568 567 1971
- M.P. Sacks Hackney S. Performance of Acoustic Components for Engine Induction Systems SAE, 880081 1988
- Kurata K. Miyake K. Abe J. Prediction of Insertion Loss of Intake and Exhaust System JSAE 24 1 98 103 1993
- Kurata K. Miyake K. Abe J. Acoustic modal Analysis of Standing Wave in Practical Intake and Exhaust System JSAE 23 2 69 74 1992
- Singh R. Schary M. Acoustic Impedance measurement Using Sine Sweep Excitation and Known Volume Velocity Technique J. Acoustical Society of America 64 4 995 1003 1978
- Nieter J.J. Singh R. Acoustic Modal Analysis Experiment J.Acoustical Society of America 72 2 319 326 1982
- Young C.J. Crocker M.J. Prediction of Transmission Loss in Mufflers by the Finite Element Method J.Acoustic Soc.Am. 57 1 144 148 1975
- Ito Principles of Industrial Acoustics One Tokyo Corona Co. 1955
- Peat K. S. Evaluation of Four-Pole Parameters for Ducts with Flow by the Finite Element Method Journal of Sound and Vibration 84 3 389 395 1982
- Tanaka T. Fujikawa T. Abe T. Utsuno H. A Method for the Analytical Prediction of Insertion Loss of a Two-Dimensional Muffler Model based on the Transfer Matrix Derived from the Boundary Element Method ASME 107 86 91 1985