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Related Experiment Video

Updated: Jun 9, 2025

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

Published on: December 3, 2016

A study on aerodynamic pass-by noise based on equivalent source method.

Shumin Zhang¹, Jiawei Shi², Haoran Wang³

¹School of Railway Locomotive and Rolling Stock, Shandong Polytechnic, Jinan, 250104, Shandong, China. fxzhangshumin@163.com.

Scientific Reports

|October 22, 2024

Summary

This summary is machine-generated.

This study introduces a new method to predict high-speed train pass-by noise, accounting for the Doppler effect. The research models train pantographs as sound sources, revealing how different parts contribute to noise at various locations.

Keywords:

Aerodynamic pass-by noise Equivalent sound source method High-speed train pantograph

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Area of Science:

Acoustics
Aerodynamics
Transportation Engineering

Background:

Pass-by noise from high-speed trains is an environmental concern, increasing with train speed.
Previous aerodynamic noise prediction methods often neglected the Doppler effect.

Purpose of the Study:

To propose an equivalent source method that incorporates the Doppler effect for aerodynamic pass-by noise prediction.
To analyze the noise contribution of different parts of a high-speed train pantograph.

Main Methods:

Developed an equivalent source method considering the Doppler effect.
Validated the method using a cylinder case.
Modeled a DSA 380 pantograph by dividing it into three parts, treating each as a monopole or dipole sound source.

Main Results:

The upper pantograph section behaves more like a dipole sound source.
The middle and lower pantograph sections approximate monopole sound sources.
The upper pantograph's noise contribution is highest directly above and lowest at the sides.

Conclusions:

The proposed method effectively models aerodynamic pass-by noise, including the Doppler effect.
Pantograph components have distinct acoustic source characteristics (monopole/dipole).
Understanding source contributions is crucial for predicting noise at different measurement points.