Carbody hunting investigation of a high speed passenger car

Huang, Chen; Zeng, Jing; Liang, Shulin

doi:10.1007/s12206-013-0611-z

Cited by 56 publications

(36 citation statements)

References 7 publications

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“…The car body hunting depends on the configuration of suspension system and is reported to occur at relatively lower frequencies and speeds. 5,25,38 With increasing speed, the car body hunting tends to occur under relatively smaller displacement amplitudes. For a given speed, further increase in the disturbance amplitude tends to diminish the wheelset response amplitude, which is followed by rapid increase leading to wheelset hunting.…”

Section: Stability Analysis Of Wagonmentioning

confidence: 99%

Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies

Ashtiani

Rakheja

Ahmed

2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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In this study, the nonlinear damping characteristics of friction wedges in the secondary suspension of a freight wagon are investigated considering nonsmooth unilateral contact, multiaxis motions, slip-stick conditions, and geometry of the wedges. The parameters of the contact pairs within the suspension were identified to achieve smooth and efficient numerical solutions, while ensuring adequate accuracy. A simulation model of the friction wedge was formulated and analyzed, which revealed highly nonlinear dependence on vertical, roll, and lateral motions between the bolster and the side frames. The friction wedge model was integrated into the multibody dynamic model of a three-piece bogie to study the effects of wedge properties on hunting characteristics. The resulting 114-degrees-of-freedom wagon model incorporated constraints due to side bearings, axle boxes, and the center plates, while the wheel-rail contact forces were obtained using the FASTSIM algorithm. The simulation results were obtained to study hunting properties of the wagon in terms of critical speed and the predominant oscillation frequency, and the effects of wedge friction and geometry on stability characteristics of the freight car. The results showed subcritical Hopf bifurcation of dynamic responses of the wagon. Moreover, an increase in the wedge angle, friction coefficient, and springs free length resulted in a higher critical speed.

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Section: Stability Analysis Of Wagonmentioning

confidence: 99%

Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies

Ashtiani

Rakheja

Ahmed

2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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show abstract

“…Fujimoto and Miyamoto 9 found increased levels of lateral vibration in the tail car of a Shinkansen train that could be reduced by installing yaw dampers between cars. Huang et al 10 found that low-frequency carbody hunting vibrations deteriorated the ride quality of Chinese high-speed trains. This vibration was caused by factors such as a large secondary lateral stiffness, a large equivalent stiffness, and damping by the yaw damper, and reducing the equivalent stiffness of the yaw damper could solve this problem.…”

Section: Introductionmentioning

confidence: 99%

A study on the dynamic behavior of the Korean next-generation high-speed train

Jeon

Kim

Park

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part F:

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This study describes the dynamic behavior of the HEMU-430X, the Korean next-generation high-speed train. The HEMU-430X was initially analyzed using VAMPIRE, a computer program that is used to examine the dynamics of railway vehicles, based on which it was expected to sway strongly at its tail end. This hunting motion was expected to disappear when the position of the yaw damper was changed. The dynamic behavior of the HEMU-430X was assessed in an on-track test performed using the protocols in the EN14363 standard and measuring the carbody, bogie and axle accelerations; the HEMU-430X was found to satisfy the safety criterion. The hunting motion appeared at speeds of 150, 350 and 387 km/h, and countermeasures such as changing the position of the yaw damper, installing carbody dampers, and increasing the damping coefficient of the yaw damper installed on the motor car containing the driver's cab were taken in order to reduce the vibrations. Ultimately, the highest test speed achieved was 421.4 km/h. Subsequently, it was found that the critical speed tended to decrease with mileage. This was attributed to excessive lateral damping and a revised design was proposed to solve this problem.

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“…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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Carbody hunting investigation of a high speed passenger car

Cited by 56 publications

References 7 publications

Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies

Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies

A study on the dynamic behavior of the Korean next-generation high-speed train

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

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