Abstract
A pantograph in contact with a catenary for power supply is one of the major aerodynamic noise sources in high-speed trains. To reduce pantograph noise, it is essential to understand the noise generation mechanism of the pantograph. However, it is difficult to determine this mechanism through measurement. Therefore, in this study, the aerodynamic and acoustic performances of a pantograph in a high-speed train were investigated through numerical analysis using the lattice Boltzmann method. First, a real-scaled pantograph was modeled through computer-aided design. Then, the surface and volume meshes of the pantograph model were generated for simulation analysis. Numerical simulation was conducted at a speed of 300 km/h based on the lattice Boltzmann method. Based on the time derivative analysis of flow pressures, it was concluded that the panhead, joint, and base were the dominant noise sources in the pantograph. In particular, various vortexes were generated from the metalized carbon strip of the panhead. The peaks of the sound pressure level propagated from the panhead were 242, 430, and 640 Hz. The noise generation mechanism was analyzed through numerical simulation using noise characteristics.
Highlights
The aerodynamic noise of high-speed trains increases sharply at a running speed of over approximately 300 km/h.1 The primary sources of aerodynamic noise are the front nose, pantograph, inter-coach spacing, and so on.[2,3] Among these, the pantograph is composed of protruding shapes in contact with a catenary for power supply.[4]
The purpose of this study is to identify the noise generation mechanism of the pantograph in a high-speed train
The aeroacoustic performances of the pantograph in a high-speed train were investigated through numerical analysis using the lattice Boltzmann method (LBM)
Summary
The aerodynamic noise of high-speed trains increases sharply at a running speed of over approximately 300 km/h.1 The primary sources of aerodynamic noise are the front nose, pantograph, inter-coach spacing, and so on.[2,3] Among these, the pantograph is composed of protruding shapes in contact with a catenary for power supply.[4]. The aerodynamic noise of high-speed trains increases sharply at a running speed of over approximately 300 km/h.1. The primary sources of aerodynamic noise are the front nose, pantograph, inter-coach spacing, and so on.[2,3] Among these, the pantograph is composed of protruding shapes in contact with a catenary for power supply.[4] high air resistance and complex flow of the pantograph are inevitable at high speeds. It is difficult to measure the propagation noise of the pantograph using microphones because of a high voltage of over 2.5 kV from the catenary. In this regard, studies have been conducted to measure and analyze the aerodynamic noise from the pantograph
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