Correlation of car-body vibration and train overturning under strong wind conditions

Liu, Dongrun; Tomasini, Gisella Marita; Rocchi, Daniele; Cheli, Federico; Zhang, Lu; Zhong, Mingjun

doi:10.1016/j.ymssp.2020.106743

Cited by 30 publications

(9 citation statements)

References 19 publications

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“…The change in lateral direction is not significant < 6 mm. A significant change in the position of the center of gravity will affect the dynamics characteristics of the vehicle, especially when maneuvering [22], [23], [30]. Therefore, the position of the center of gravity of each vehicle must be known to predict the level of stability of the vehicle when operating on the road.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Analysis of Minibuses Gravity Center: A Post-Production Review for Car Body Industry

Karmiadji¹,

Gozali²,

Setiyo

et al. 2021

Mech. Eng. for Soc. and Ind.

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The center of gravity (CoG) on the minibus is one of the fundamental parameters that affect the operation of the vehicle to maintain traffic safety. CoG greatly affects vehicle maneuverability due to load transfer between the front and rear wheels, such as when turning, braking, and accelerating. Therefore, this research was conducted to evaluate the operational safety of minibusses produced by the domestic car body industry. The case study was conducted on a minibus with a capacity of 30 passengers to be used in a mining area. Investigations on CoG were carried out based on the minibus specification data, especially the dimensions and forces acting on the wheels. Minibusses as test objects were categorized in two conditions, namely without passengers and with 30 passengers. The test results are expressed in a coordinate system (x, y, z) which represents the longitudinal, lateral, and vertical distances to the center of the front wheel axle. CoG coordinate values without passengers are (2194.92; 7.11; 1327.97) mm and CoG coordinates with full passengers (30 people) are (2388.52; 13.04; 1251.72) mm. The test results show that the change in CoG at full load is not significant which indicates the minibus is safe when maneuvering under normal conditions.

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Section: Resultsmentioning

confidence: 99%

Comprehensive Analysis of Minibuses Gravity Center: A Post-Production Review for Car Body Industry

Karmiadji¹,

Gozali²,

Setiyo

et al. 2021

Mech. Eng. for Soc. and Ind.

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show abstract

“…To understand the operational safety of trains passing through complex terrain sections under strong wind conditions, the car-body vibrations of different trains in different railway lines under strong wind conditions were measured using the method given in reference 5 by the full-scale tests from 2014 to 2016. 4,9 The results revealed that the value of car-body roll angle and lateral displacement of the gravity center was significantly larger than the other parameters, such as yaw angle, pitch angle, and vertical displacement of the gravity center. And at some moments there was a significant change when the high-speed train passes through transition regions of different windproof structures or topography sections, as shown in Figure 4.…”

Section: Car-body Vibration Characteristic In Windy Conditionsmentioning

confidence: 95%

“…Hence, the possibility of train overturning due to car-body severe vibrations is greater than the risk of train derailment due to the transient impact of the wheel and rail in windy conditions. 9 It is not enough to monitor the train operation safety under strong wind conditions only from the perspective of bogie and wheelset acceleration. It can also be seen that the car-body car-body vibration amplitude is the primary factor affecting train operation safety and riding comfort in windy conditions.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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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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“…With the function of centrifugal force, load shedding happens on the inner side of the vehicle wheels that is marked with A in Figure 2(a), while the force on the other side of the wheels increases. Under the critical overturning state, the vertical force of unloading wheels decreases to zero and the overturning coefficient D could be described as, 31…”

Section: Methodsmentioning

confidence: 99%

Analysis of passenger’s injuries caused by sidewall impact during train-overturn derailments

Wang

Peng

et al. 2022

Proc Inst Mech Eng H

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The contact between passenger and the vehicle interior especially sidewall in train overturn derailment accident cause extremely serious injuries to passenger. It is regrettable that there are few relevant studies that account for overturning accidents and passenger injuries. In this study, the impact responses subject to sidewall and passenger injuries during train-overturn derailments are investigated. First, a theoretical model and a practical accident are used to validate the overturning multi-body dynamic model of an 8-car Electric Multiple Unit (EMU) coupled with a passenger. And then, the passenger’s kinematic responses of baseline models with tray tables put back and put down are studied. The results of simulation cases with different train speeds (V), friction coefficients, chair distances (D), and passenger positions (P) show that V and D have a positive impact on passenger injuries. While the friction coefficient has an overall negative influence on the passenger’s injuries, there are some irregular fluctuations. Generally, the sitting position farther away from the sidewall tends to be more dangerous for passengers. And the tray table plays an important role in protecting passengers under the same conditions. This study provides referential value for the study of train overturning accidents and guidance for the protection of passengers.

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Correlation of car-body vibration and train overturning under strong wind conditions

Cited by 30 publications

References 19 publications

Comprehensive Analysis of Minibuses Gravity Center: A Post-Production Review for Car Body Industry

Comprehensive Analysis of Minibuses Gravity Center: A Post-Production Review for Car Body Industry

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

Analysis of passenger’s injuries caused by sidewall impact during train-overturn derailments

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