Carbody elastic vibrations of high-speed vehicles caused by bogie hunting instability

Lai, Wei Chih; Zeng, Jing; Chi, Maoru; Wang, Jianbin

doi:10.1080/00423114.2017.1310386

Cited by 61 publications

(34 citation statements)

References 11 publications

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“…When the wheel profile of an HST wears down – for example, when a vehicle has run a distance of 200,000 km after its wheels were re-profiled using a turning lathe – bogie hunting motion may become evident. 2 When the running distance reaches to 250,000 km and the equivalent conicity exceeds 0.35, the transverse acceleration at the frame end of the bogie shows obvious harmonics. In this subsection, measured wheel and rail profiles with an equivalent conicity of 0.40 are used in the MBS simulation, and the wheel–rail friction coefficient is considered as 0.40 in general.…”

Section: Study Of Vehicle Dynamics Using the Proposed Yd Modelmentioning

confidence: 98%

“…The analysed HST is one that runs on passenger-dedicated lines in northeast China, for which some particular dynamics issues have been encountered in recent years. 1–3 When the wheel–rail interaction experiences an extreme state – for example, very low friction coefficient or very low equivalent conicity – the bogie or vehicle experiences hunting motion that decreases the ride comfort significantly. Because the YD can improve vehicle stability, it was optimized through many numerical simulations and rig tests in our laboratory.…”

Section: Study Of Vehicle Dynamics Using the Proposed Yd Modelmentioning

confidence: 99%

“…Many dynamics-related issues have arisen in the past decade with the development of Chinese HSTs, most of which are associated with the hunting stability, which can be solved by optimizing the YD performance. 1–3 For example, some trains swing heavily with a frequency of 1–2 Hz just after the wheel treads have been re-profiled. This low-frequency hunting motion results in poor ride comfort and causes passenger dizziness.…”

Section: Introductionmentioning

confidence: 99%

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Improved nonlinear model of a yaw damper for simulating the dynamics of a high-speed train

Teng

Shi

Luo

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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The aim of this paper is to establish a simple and accurate nonlinear model of a yaw damper for the dynamic numerical simulation of high-speed trains. An improved nonlinear yaw damper model is proposed based on the traditional Maxwell model. It comprises a piecewise linear force–displacement spring and a piecewise linear force–velocity damper in series. These nonlinear inputs for the model are retrieved from the dynamic performance tests of the damper, and the force–displacement and force–velocity curves are further modified to improve the modelling accuracy according to the test results. The proposed model can accurately simulate the damper's dynamic stiffness and dynamic damping characteristics with respect to the excitation frequency or displacement, which cannot be reproduced when using the traditional Maxwell model. Both the traditional Maxwell model and the improved nonlinear model presented in this work are integrated into a multibody dynamics railway vehicle model to simulate the typical dynamic problems of a high-speed train operating at 250 km/h in northeast China. Through comparative analysis, it was found that the numerical simulations are consistent with the field measurements. It can be concluded that the proposed nonlinear damper model is more suitable for studying railway vehicle system dynamics under various operating cases. By contrast, the input parameters of the traditional Maxwell model must be modified artificially according to the vehicle responses and the dynamic characteristics of the yaw damper.

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Section: Study Of Vehicle Dynamics Using the Proposed Yd Modelmentioning

confidence: 98%

Section: Study Of Vehicle Dynamics Using the Proposed Yd Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved nonlinear model of a yaw damper for simulating the dynamics of a high-speed train

Teng

Shi

Luo

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

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show abstract

“…In addition to the damping ratio, the frequency of the hunting motion should also be given enough attention, as it could affect the abnormal vibration of the vehicle on many situations. Both car body hunting [28] and car body shaking [29], observed in daily operation in China, are relevant to the hunting frequency. Furthermore, the traditional formula of the hunting wavelength derived by Klingle [30] is no longer suitable for the analysis of highspeed vehicles.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Numerical Investigation into the Critical Speed and Frequency of the Hunting Motion in Railway Vehicle System

Sun

Chi

Cai

et al. 2019

Mathematical Problems in Engineering

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The critical speed and hunting frequency are two basic research objects of vehicle system dynamics and have a significant influence on the dynamic performance. A lateral dynamic model with 17 degrees of freedom was established in this study to investigate the critical speed and hunting frequency of a high-speed railway vehicle. The nonlinearities of wheel/rail contact geometry, creep forces, and yaw damper were all considered. A heuristic nonlinear creep model was employed to estimate the contact force between the wheel and the rail. The Maxwell model, which covers the influence of the stiffness characteristic, is used to simulate the yaw damper. To reflect the blow-off of the yaw damper, the damping coefficient is described by stages. Based on the mathematical model, the combined effects of vehicle parameters on the critical speed in the straight line and hunting frequency of the wheelset were investigated innovatively. The novel phenomenon that the hunting frequency exhibits a sudden increase from a smaller value to a larger value when the blow-off of the yaw damper occurs was discovered during the calculations. The extents to which various parameters affect the critical speed and hunting frequency are clear on the basis of the numerical results. Moreover, all of the parameter values were divided into three sections to determine the sensitive range for the critical speed and hunting frequency. The results show that the first section of values plays the decisive role on both the critical speed and the hunting frequency for all parameters analyzed. The investigation in this paper enriches the study of hunting stability and gives some ideas to probably solve the abnormal vibrations during the actual operation.

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“…With the advantage of considerable rigidity, strong bearing capacity, high precision, no error accumulation, and so on, the EHST is commonly used in aviation, ship, automobile, building and other fields [1]- [4]. A vibration test rig is used to simulate the vibration environment of high-speed railway, and dynamic parameters of the specimen are studied by experiments [5], [6]. In the EHST, the number of hydraulic cylinders is greater than the degree-of-freedom (DOF), and the redundant degrees of freedom will cause coupling among the branches [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Modal Space Feedforward Control for Electro-Hydraulic Parallel Mechanism

Shen

Zang

et al. 2019

IEEE Access

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As a parallel mechanism with six-degree-of-freedom, an electro-hydraulic shaking table is endowed with strong coupling characteristics among different degree-of-freedoms. When the electrohydraulic shaking table moves to one direction, there will be some unnecessary related motions in other directions, which will affect the tracking accuracy. The kinematics model, the dynamic model, and the electro-hydraulic model are all established based on analyzing the components and working principles of the electro-hydraulic shaking table. After that, a modal space controller is built on the basis of a threevariable feedback controller by relying on the designed modal space matrix on the premise of modal control theory. In this regard, a multiple-input multiple-output system with strong coupling within the physical space is transformed into a set of single-input single-output systems independent from each other within the modal space. Moreover, the accuracy of vibration control can be improved by introducing a discrete feedforward controller. It is evident from the experimental results that the proposed control strategy can effectively improve the accuracy of vibration control.INDEX TERMS Electro-hydraulics, parallel mechanism, vibration control, coupling, modal space control.

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Carbody elastic vibrations of high-speed vehicles caused by bogie hunting instability

Cited by 61 publications

References 11 publications

Improved nonlinear model of a yaw damper for simulating the dynamics of a high-speed train

Improved nonlinear model of a yaw damper for simulating the dynamics of a high-speed train

Numerical Investigation into the Critical Speed and Frequency of the Hunting Motion in Railway Vehicle System

Modal Space Feedforward Control for Electro-Hydraulic Parallel Mechanism

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