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

Sun, Jianfeng; Chi, Maoru; Cai, Wubin; Jin, Xuesong

doi:10.1155/2019/7163732

Cited by 16 publications

(11 citation statements)

References 37 publications

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“…31,32 Except the damping characteristics, the stiffness behavior of the yaw damper actually has a considerable influence on the dynamic performance of the vehicle. [33][34][35] In this paper, the elastic characteristic related to the connection joints of the yaw damper has been considered, as shown with the red dotted line in Figure 2(b). To integrate the yaw damper model into the vehicle system, the mathematical description of the relative movement between the yaw damper and the connected components should be determined.…”

Section: Mathematical Model Of a High-speed Railway Vehiclementioning

confidence: 99%

Modal parameters-based hunting stability analysis of high-speed railway vehicles considering full range of equivalent conicity

Sun

Chi

Jiao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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The balance of vehicle parameters to avoid both the carbody and bogie hunting instabilities existing at different stage of vehicle operation is a long-standing problem. However, most of the existing researches focus on a single form of hunting instability and only take specific value of equivalent conicity as the worst case of wheel-rail contact relationship. To face this challenging problem, this paper studies the hunting stability of high-speed railway vehicles from the perspective of modal parameters based linearized analysis. The root locus analysis is carried out first to observe the modal information and hunting stability. The continuous modal tracking method is exploited to understand the variation regularity of each mode under the speed parametric excitation, especially when the frequency coupling occurs. Two objective functions related to the minimal damping ratio are proposed to indicate the severity of carbody and bogie hunting instabilities, respectively. The proposed objective functions consider the full range of running speed and wheel-rail contact conicity during operation. Starting from the objective functions, the sensitive analysis and a vector evaluated genetic algorithm are implemented to optimize the suspension parameters. Finally, the optimal solution of the suspension parameters is obtained after a generation of 20. The research method presented in this paper deepens the understanding of hunting motion and improves the vehicle stability in a simple, efficient and effective way.

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Section: Mathematical Model Of a High-speed Railway Vehiclementioning

confidence: 99%

Modal parameters-based hunting stability analysis of high-speed railway vehicles considering full range of equivalent conicity

Sun

Chi

Jiao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…Moreover, some researchers also focussed on investigation of stability and hunting of rail vehicles using MR suspension. 21,28,29 Daliri et al investigated the charaterstics of magneto-hydrodynamic fluid under combined squeeze and shear modes, that can be utilised in dampers to control the translation and rotational motion in vehile systems. 30, 31 The performance of the semi-active suspension systems depends upon different types of control schemes.…”

Section: Introductionmentioning

confidence: 99%

Modelling and analysis of passenger rail vehicle for the improvement of critical speed using MR damper based semi-active suspension

Singh

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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Developing economies focus to enhance train speed by introducing high speed corridors and upgrading existing rail infrastructure. Higher speed has adverse impact on vehicle stability and ride comfort. Therefore, in order to improve critical speed and ride comfort magneto-rheological (MR) based dampers are used. Here, the lateral dynamics of an Indian passenger rail vehicle is expressed with 17 degrees of freedom model and after validation, it is used to examine the effect of suspension parameters such as damping and stiffness on critical speed. Moreover, a sensitivity analysis is performed and it is found that critical speed is the most sensitive to secondary lateral damping coefficient. Therefore, these dampers are replaced with MR fluid dampers to evaluate improvement in stability and critical speed. The modified Bouc-Wen model is formulated to characterise the behaviour of the MR damper. Herein, two distinct controllers: disturbance refusal and damper force tracking control algorithms are employed to govern the entire system. Measured random track irregularities are applied as an input to simulate the system. The results reveal that the semi-active suspension improves the critical speed by 19.38 km/h (9.89%) when compared to the existing passive suspension, and significantly reduces the vibration responses of the carbody in a wide frequency spectrum at higher speeds of the train.

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“…In terms of the hydraulic damper, the Maxwell model, consisting of a linear spring in series with a linear dashpot, is widely used in railway vehicle dynamics and has been integrated into the simulation software (SIMPACK, ADAMS/RAIL, etc.) [5,6].…”

Section: Introductionmentioning

confidence: 99%

An Investigation into the Modeling Methodology of the Coil Spring

Dai

Chi

Gao

et al. 2020

Shock and Vibration

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The coil spring is an important element in the suspension system of railway vehicles, and its structural vibration caused by the mass distribution can deteriorate the dynamic performance of the vehicle. However, the coil spring is usually modelled as a simple linear force element without considering the dynamic characteristics in multibody dynamic simulations of railway vehicles. To integrate the dynamic characteristics of the coil spring into the simulation, three equivalent dynamic models of the coil spring are established by treating the coil spring as multimass spring series, Timoshenko beam, and flexible spring, respectively. The frequency-sweep method is applied to obtain the dynamic response of the proposed models of coil spring, and the accuracy of the models’ results has been compared and verified by the laboratory test. Results show that all of these three equivalent models can reflect the influence of the spring mass distribution on its dynamic responses. Compared with the mass-spring series and beam element equivalent models, the flexible spring model can better reflect the dynamic stiffness and stress of the coil spring changing with the exciting frequency. Thus, the flexible spring model proposed in this paper is more applicable to railway vehicle system dynamics and the fatigue analysis.

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

Cited by 16 publications

References 37 publications

Modal parameters-based hunting stability analysis of high-speed railway vehicles considering full range of equivalent conicity

Modal parameters-based hunting stability analysis of high-speed railway vehicles considering full range of equivalent conicity

Modelling and analysis of passenger rail vehicle for the improvement of critical speed using MR damper based semi-active suspension

An Investigation into the Modeling Methodology of the Coil Spring

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