Impact of Air-conditioning Systems on Metro Vehicle Interior Noise and Optimization Analysis

Abstract

Objective Metro vehicle interior noise affects passenger comfort, with the air-conditioning system causing an undeniable impact. Therefore, it is necessary to study related issues to improve passenger’s riding experience. Method Using the SEA (statistical energy analysis) method, a simulation model for metro vehicle interior noise is established, and simulated calculations are performed based on field-measured sound source data from air-conditioning units. The impact of air-conditioning units on interior noise and optimization methods are investigated. Result & Conclusion The results indicate that under static conditions, air-conditioning noise has the greatest impact on vehicle interior noise. Under operating conditions, due to the influence of traction system noise on the trailer cars, the impact of air-conditioning system on interior noise in trailer cars is greater than in motor cars. As metro operating speed increases, wheel-rail noise becomes the main component, reducing the impact of air-conditioning on interior noise. The air-conditioning system mainly affects interior noise in the mid-to-low frequency range below 400 Hz, while frequency components above 400 Hz are primarily caused by wheel-rail noise and traction system noise. Since the air supply outlet of metro vehicle air-conditioning system contributes significantly to interior noise, optimizing the air supply outlet can significantly reduce interior noise levels.

Keywords

• metro
• air-conditioning system
• vehicle interior noise