Transmission Loss Characteristics of Dual Cavity Impedance Composite Mufflers for Non-Planar Wave Cavity Resonance

In conventional gasoline automobiles, the engine powers the air conditioning system and engine noise can somewhat mask the noise and vibration of the air conditioning system. In pure electric vehicles, however, the absence of an engine makes the air conditioning system’s noise more noticeable, conce...

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Bibliographic Details
Published inApplied sciences Vol. 14; no. 16; p. 6879
Main Authors Huang, Yizhe, Yan, Bojin, Zhang, Huizhen, Wang, Chenlin, Wang, Jun, Zhang, Zhifu, Huang, Qibai, Zhan, Xin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2024
Subjects
Acoustic properties
Acoustics
Air conditioning
Automobiles, Electric
cavity resonance
dual cavity impedance composite muffler
Electric vehicles
Equipment and supplies
Noise control
non-planar wave
Performance evaluation
Propagation
Sound waves
transmission loss characteristics
Travel
Ventilation
Vibration
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Summary:In conventional gasoline automobiles, the engine powers the air conditioning system and engine noise can somewhat mask the noise and vibration of the air conditioning system. In pure electric vehicles, however, the absence of an engine makes the air conditioning system’s noise more noticeable, concentrated in a limited frequency range at constant speeds. As a result, aerodynamic noise from the air conditioning system is a primary noise source in electric vehicles. Pipeline silencers are the main method for reducing this noise. The current silencer design uses plane wave acoustic theory but when cavity modal resonance occurs, the transmission loss error is relatively high. This article addresses the issue of non-planar wave cavity resonance, studying the cavity modal of a muffler using the finite element method to reveal the transmission loss under cavity mode resonance. A dual cavity expansion structure of an impedance composite muffler is proposed, with sound-absorbing materials placed in the cavity to enhance acoustic performance. The analysis of the transmission loss characteristics of the impedance composite muffler provides a theoretical basis for noise control in pure electric vehicle air conditioning systems.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14166879