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Characteristics of interior noise of a Chinese high-speed train under a variety of conditions

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第8期18卷 617-630页

作者： Jie ZHANG Xin-biao XIAO Xiao-zhen SHENG Rong FU Dan YAO Xue-song JIN State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China

This paper presents an investigation into the characteristics of interior noise of a Chinese high-speed train under several typical conditions. Interior noises within Vehicle TC01, which can be used as a head car or an end car, and Vehicle TP03, the third car counting from TC01, are measured for the train running at speeds from 260 km/h to 385 km/h, along two types of track including a slab track and a ballast track and either on the ground surface or in a tunnel. Data analyses are performed for sound pressure overall levels, frequency, area contributions, and possible generation mechanisms, showing how they are affected by train speed, running direction, track type, and tunnel. The results show that, whether TC01 is used as head car or end car, the interior noise characteristics in the VIP cabin are mostly related to aerodynamic noise. Differences in interior noise between tracks become smaller as the train speed increases. The effect of a tunnel on the interior noise is more important for the middle coach than that for the head coach. This study can provide a basis for noise control of high-speed trains.

关键词： High-speed train Interior noise noise source identification Contribution analysis Various conditions noise characterization

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Pulse-Width Jitter Measurement for Laser Diode Pulses

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Chinese Physics Letters 2006年第10期23卷 2756-2758页

作者：汤君华王云才 Physics Department College of Science Taiyuan University of Technology Taiyuan 030024

Theoretical analysis and experimental measurement of pulse-width fitter of diode laser pulses are presented. The expression of pulse power spectra with all amplitude jitter, timing jitter and pulse-width jitter is deduced. The power spectra with and without pulse-width fitter are that the pulse-width jitter will contribute considerably numerically simulated. The simulation results indicate noise to the pulse power spectrum while the product of pulse width and angular frequency is larger than 1. The experimental measurement of pulse-width fitter of a gain-switched Fabry-Perot laser diode with 2.4 GHz repetition rate is also reported. In comparison of the noise power spectra of the first, fourth and seventh harmonics of the pulse repetition rate, 2.3ps pulse-width jitter is obtained.

关键词： noise characterization TIMING JITTER DEMODULATION SPECTRA

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