Investigation of effect of train body vibration on measurement of fluctuation pressure on the surface of high-speed train

Measurement ◽  
2021 ◽  
Vol 168 ◽  
pp. 108442
Author(s):  
Chunjun Chen ◽  
Chao Deng ◽  
Dongwei Wang
Keyword(s):  
High Speed ◽  
High Speed Train ◽  
Body Vibration ◽  
Fluctuation Pressure

Aerodynamic Noise Reduction Analysis in High-Speed Train Cab

2014 ◽  
Vol 1049-1050 ◽  
pp. 1022-1025
Author(s):  
Xiao Feng Zhang ◽  
You Gang Xiao ◽  
Liang Sun ◽  
Yu Shi
Keyword(s):  
High Speed ◽  
Power Flow ◽  
Simulation Method ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Interior Decoration ◽  
Eddy Simulation ◽  
Head Surface ◽  
Large Eddy ◽  
Fluctuation Pressure

In order to reduce aerodynamic noise in high-speed train cab,the SEA model of cab is established. The fluctuation pressures from train head surface are calculated by large eddy simulation method. Using fluctuation pressure as excitation force, power flow caused by airflow among sub-systems of SEA model of cab is obtained. Two schemes are put forward to reduce the aerodynamic noise in cab, namely interior decoration modification and windowpane thickness increase. The results show that when a layer of splint with 0.01 m thickness, 0.5 loss factor is added to the original decoration in cab, the overall sound pressure level (SPL) at driver head location will reduce 1.23 dB(A). When the cab windowpane thickness is increased to 5 mm from 4 mm, the overall SPL at the driver head location will reduce 0.87 dB(A).

A monitoring method for car-body vibration displacement of a high-speed train in windy conditions

2021 ◽  
pp. 095440972110341
Author(s):  
Tian Li ◽  
Dongrun Liu ◽  
Zhaijun Lu ◽  
XiaoBai Li ◽  
Mu Zhong
Keyword(s):  
Monitoring System ◽  
High Speed ◽  
High Speed Train ◽  
Vibration Displacement ◽  
Monitoring Method ◽  
Body Vibration ◽  
Car Body ◽  
Long Term Monitoring ◽  
Term Monitoring

The long-term monitoring of car-body vibration displacement when a high-speed train passes through complex terrain sections in windy conditions has become an urgent engineering problem in China. However, few studies have focused on this topic, and an effective engineering long-term monitoring method is lacking in China. In this study, by combining the vibration characteristics and structural characteristics of railway vehicles, a real-time car-body displacement monitoring method to fulfill monitoring requirements was proposed, and a mathematical computational model based on space coordinate transformations to calculate the car-body displacements in operation was developed. Moreover, the comparison and the verification of the monitoring system accuracy were conducted using full-scale tests. The results showed that the displacement of the car-body relative to the bogie frame obtained through the system was consistent with the real vibration state of the car-body. Therefore, our monitoring system was reliable in reflecting the car-body vibration displacement changes in high-speed trains that were in motion.

Research of Aerodynamic Noise Prediction of High-Speed Train

2012 ◽  
Vol 562-564 ◽  
pp. 1133-1136
Author(s):  
Li Fang Yang ◽  
Xiao Wei He ◽  
Fan Yu Meng
Keyword(s):  
High Speed ◽  
Energy Analysis ◽  
Rapid Development ◽  
Prediction Method ◽  
Aerodynamic Noise ◽  
Statistical Energy Analysis ◽  
High Speed Train ◽  
Key Factor ◽  
Fluctuation Pressure ◽  
Element Theory

Under the background of China rapid development of high-speed train, this paper aims at prediction of the aerodynamic noise of train, which plays a key factor for controlling the train noise. In order to develop the prediction model of the aerodynamic noise of train, first the finite and boundary element theory are utilized to calculate the fluctuation pressure of the motion train; then Statistical Energy Analysis (SEA) model of the train noise is built and the SEA parameters are calculated. Based on the above models, the prediction method of aerodynamic noise of train is developed to calculate the train noise with train velocity.

Tribological and dynamical analysis of a brake pad with multiple blocks for a high-speed train

2019 ◽  
Vol 234 (11) ◽  
pp. 1771-1788
Author(s):  
YK Wu ◽  
JL Mo ◽  
B Tang ◽  
JW Xu ◽  
B Huang ◽  
...  
Keyword(s):  
High Speed ◽  
Wear Behavior ◽  
Dynamical Analysis ◽  
Brake Disc ◽  
Brake Pad ◽  
High Speed Train ◽  
Brake Squeal ◽  
Element Analysis ◽  
Single Block ◽  
Middle Ring

In this research, the tribological and dynamical characteristics of a brake pad with multiple blocks are investigated using experimental and numerical methods. A dynamometer with a multiblock brake pad configuration on a brake disc is developed and a series of drag-type tests are conducted to study the brake squeal and wear behavior of a high-speed train brake system. Finite element analysis is performed to derive physical explanations for the observed experimental phenomena. The experimental and numerical results show that the rotational speed and braking force have important influences on the brake squeal; the trends of the multiblock and single-block systems are different. In the multiblock brake pad, the different blocks exhibit significantly different magnitudes of contact stresses and vibration accelerations. The blocks located in the inner and outer rings have higher vibration acceleration amplitudes and stronger vibration energies than the blocks located in the middle ring.

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