Formulation of Reliability-Based Fatigue Assessment of a Car Body for a High Speed Train Passing Through Tunnels

2006 ◽  
pp. 1530-1534
Author(s):  
Choo Soo Park ◽  
Sung Il Seo ◽  
Sung Hoon Choi ◽  
Jin Yong Mok
Keyword(s):  
High Speed ◽  
High Speed Train ◽  
Fatigue Assessment ◽  
Car Body

scholarly journals The coupled effects of bending and torsional flexural modes of a high-speed train car body on its vertical ride quality

2019 ◽  
Vol 233 (4) ◽  
pp. 979-993 ◽  
Author(s):  
Vahid Bokaeian ◽  
Mohammad A Rezvani ◽  
Robert Arcos
Keyword(s):  
Analytical Model ◽  
Quality Index ◽  
High Speed ◽  
Ride Quality ◽  
Vertical Acceleration ◽  
Beam Model ◽  
High Speed Train ◽  
Flexural Mode ◽  
Car Body ◽  
Rail Irregularities

This study is focused on the effects of bending and torsional flexural modes of the car body on the ride quality index of a high-speed train vehicle. The Euler–Bernoulli beam model is used to extract an analytical model for a high-speed train vehicle car body in order to investigate its bending and torsional flexural vibrations. The rigid model includes a car body, two bogie frames, and four wheelsets such that, each mass has three degrees of freedom including vertical displacement, pitch motion, and roll motion. The results obtained with the proposed analytical model are compared with experimental measurements of the car body response of a Shinkansen high-speed train. Moreover, it is determined that the bending and torsional flexural modes have significant effects on the vertical acceleration of the car body, particularly in the 9–15 Hz frequency range. Furthermore, the ride quality index is calculated according to the EN 12299 standard and it is shown that the faster the train the more affected is the ride quality by the flexural modes. In addition, the effect of coherence between two rail irregularities (the right and the left rails) on the results of the simulation is investigated. The results conclude that if the irregularities are completely correlated the torsional flexural mode of the car body does not appear in the response. Also, the first bending flexural mode in such cases is more excited compared with the partially correlated or uncorrelated rail irregularities. Therefore, the ride quality index in completely correlated cases is higher than other cases.

scholarly journals A New Vibration Absorber Design for Under-Chassis Device of a High-Speed Train

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Yu Sun ◽  
Jinsong Zhou ◽  
Dao Gong ◽  
Wenjing Sun ◽  
Zhanghui Xia
Keyword(s):  
High Speed ◽  
Vibration Absorber ◽  
High Speed Train ◽  
Car Body ◽  
Multibody Dynamic ◽  
New Type ◽  
Rubber Component ◽  
Transfer Method ◽  
Optimal Stiffness ◽  
Disc Spring

To realize the separation of vertical and lateral stiffness of the under-chassis device, a new type of vibration absorber is designed by using the negative stiffness of the disc spring in parallel with the rubber component. To solve its transmission characteristics, harmonic transfer method was used. A rigid-flexible coupling multibody dynamic model of a high-speed train with an elastic car body is established, and the vertical and lateral optimal stiffness of the under-chassis device are calculated. The Sperling index and acceleration PSD of the vehicle with the new vibration absorber and the vehicle with traditional rubber absorber are compared and analyzed. The results show that, with the new vibration absorber, vehicle’s running stability and vibration of the car body are more effective than the vehicle with the traditional rubber absorber.

Effect of the Welding Heat Input on Residual Stresses in Butt-Weld of High-Speed Train

2011 ◽  
Vol 337 ◽  
pp. 255-261 ◽  
Author(s):  
Zhong Yin Zhu ◽  
Peng Chen ◽  
Hong Mei Zhou ◽  
Yong Hui Zhu ◽  
Yong Hong Chen ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Residual Stresses ◽  
Heat Input ◽  
High Speed ◽  
Side Wall ◽  
High Speed Train ◽  
Butt Weld ◽  
Car Body ◽  
Welding Heat Input

Abstract. This study used finite element software SYSWELD to analyze residual stresses in butt-weld between underframe and side wall of high-speed train car body. Based on the thermal-elastic-plastic theory, double ellipsoid heat source model is adopted to simulate the residual stresses under different heat input in the welded joints between underframe and side wall. The residual stresses at the surface of weld specimen were measured experimentally by using the hole-drilling method. The results of the finite element analysis were compared with experimentally measured data to evaluate the accuracy of the finite element modeling. Based on this study, a modelling procedure with reasonable accuracy was developed. The developed finite element modelling was used to study the effects of welding heat input on magnitude and distribution of welding residual stresses in butt-weld of high-speed train car body made of A6N01-T5. The results show the maximum residual stress exists in the welded seam and the adjacent-weld zone, and the residual stress value decreases gradually while the zone is farther from the weld center .Besides, With the increase of the welding heat input, the residual stress value increases gradually.

Formulation of Reliability-Based Fatigue Assessment of a Car Body for a High Speed Train Passing Through Tunnels

2006 ◽  
Vol 321-323 ◽  
pp. 1530-1534 ◽  
Author(s):  
Choo Soo Park ◽  
Sung Il Seo ◽  
Sung Hoon Choi ◽  
Jin Yong Mok
Keyword(s):  
High Speed ◽  
Structural Reliability ◽  
Transfer Functions ◽  
Vehicle Body ◽  
Railway Vehicle ◽  
Distribution Characteristics ◽  
High Speed Train ◽  
Fatigue Reliability ◽  
Car Body ◽  
System Pressure

In designing the structures of railway rolling stocks, deterministic methods associated with the concept of a safety factor have been traditionally used. The deterministic approaches based on the mean values of applied loads and material properties have been used as safety verification for the design of the car body structures. The uncertainties in the applied loading for the high speed train and the strength of new materials in the structure require the application of probabilistic approaches to ensure fatigue safety in the desired system. Pressure loadings acting on the car body when the train passes through tunnels show reflected pressure waves for high-speed trains and they may cause a fatigue failure in vehicle bodies. In this paper, it is proposed that a fatigue design and assessment method based on a structural reliability that deals with the loading of pressure variations on a railway vehicle reflected in tunnels and the strength variations of material. Equation for the fatigue reliability index has been formulated to calculate the reliability assessment of a vehicle body under fluctuating pressure loadings in a tunnel. Considered in this formulation are the pressure distribution characteristics, the fatigue strength distribution characteristics, and the concept of stress-transfer functions due to the pressure loading.

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.

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