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  11. Analysis Of Single Vehicle Noise Emissions In The Frequency Domain For Two Different Motorizations

Analysis of single vehicle noise emissions in the frequency domain for two different motorizations

Antonio Pascale1, Claudio Guarnaccia2, Margarida C Coelho3

  • 1Department of Mechanical Engineering / Centre for Mechanical Technology and Automation (TEMA), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; LASI - Intelligent Systems Associate Laboratory, Guimarães, Portugal.

Journal of Environmental Management
|October 17, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Vehicle motorization significantly impacts noise emissions, with low-frequency sounds dominating, especially at lower speeds. This study analyzes diesel and LPG vehicles, offering insights for noise reduction strategies.

Area of Science:

  • Environmental Acoustics
  • Transportation Noise Pollution

Background:

  • Road transportation is a major source of environmental noise in Europe, affecting quality of life.
  • Characterizing single-vehicle noise emissions, particularly in the frequency domain, is crucial for mitigation.

Purpose of the Study:

  • To investigate single-vehicle noise emissions in the frequency domain, focusing on motorization (fuel type).
  • To analyze the contribution of low-frequency components to overall noise levels.
  • To compare measured noise data with existing models like CNOSSOS-EU, Harmonoise, and REMEL.

Main Methods:

  • Utilized two probe vehicles: one diesel and one Liquefied Petroleum Gas (LPG)-powered.
  • Collected noise emission data in the frequency domain (63 Hz to 8000 Hz).
  • Analyzed exhaust noise emissions at the tailpipe in the frequency domain.
Keywords:
Exhaust noise emissionsLow-frequency noiseSpectral analysisVehicle noise emissions

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Main Results:

  • Motorization type influences noise emissions, with varying frequency component contributions at different speeds.
  • Low-frequency components were predominant for both diesel and LPG vehicles, particularly at lower speeds.
  • Exhaust noise analysis revealed resonance at 63 Hz and dominance of low frequencies.

Conclusions:

  • Vehicle motorization and speed significantly affect noise emission spectra, with low frequencies being key.
  • Findings support the need for noise reduction strategies targeting low-frequency emissions during idling and low-speed operations.
  • The study provides valuable data for refining noise emission models and understanding vehicle acoustics.