Cavitation induced hydraulic yaw damper failure and its effect on railway vehicle dynamic stability

Gao, Hongxing; Sun, Jianfeng; E, Shiju; Chi, Maoru

doi:10.1016/j.engfailanal.2024.108318

Cited by 2 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under normal conditions, when a vehicle operates below critical speed, hunting motions induced by disturbances typically stabilize quickly to an equilibrium position. However, if the vehicle exceeds the critical speed, disturbances can lead to periodic oscillations with increasing amplitude, resulting in instability, which is referred to as hunting instability [ 2 , 3 , 4 ]. In real-world operations, hunting stability is influenced by various factors such as wheel–rail wear, track geometry, curve radius, track gauge, and suspension system, which means instability can occur even at speeds below the critical speed.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Bogie Hunting Instability for Railway Vehicles Based on Multiple Sensors

Zheng,

Wei,

Zeng

et al. 2024

Sensors

View full text Add to dashboard Cite

Bogie hunting instability is one of the common faults in railway vehicles. It not only affects ride comfort but also threatens operational safety. Due to the lower operating speed of metro vehicles, their bogie hunting stability is often overlooked. However, as wheel tread wear increases, metro vehicles with high conicity wheel–rail contact can also experience bogie hunting instability. In order to enhance the operational safety of metro vehicles, this paper conducts field tests and simulation calculations to study the bogie hunting instability behavior of metro vehicles and proposes corresponding solutions from the perspective of wheel–rail contact relationships. Acceleration and displacement sensors are installed on metro vehicles to collect data, which are processed in real time in 2 s intervals. The lateral acceleration of the frame is analyzed to determine if bogie hunting instability has occurred. Based on calculated safety indicators, it is determined whether deceleration is necessary to ensure the safety of vehicle operation. For metro vehicles in the later stages of wheel wear (after 300,000 km), the stability of their bogies should be monitored in real time. To improve the stability of metro vehicle bogies while ensuring the longevity of wheelsets, metro vehicle wheel treads should be reprofiled regularly, with a recommended reprofiling interval of 350,000 km.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Bogie Hunting Instability for Railway Vehicles Based on Multiple Sensors

Zheng,

Wei,

Zeng

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

Carbody hunting behaviour of high speed vehicles in low effective conicity of wheel-rail contact

Zheng,

Wei,

Zeng

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

In the past, bogie hunting instability garnered more attention due to its potential for causing serious safety issues. However, with the rise in high-speed vehicle speeds and operational mileage, the concerns arising from carbody hunting can no longer be overlooked. This article investigates the causes and solutions for low-frequency carbody swaying under low effective conicity in wheel-rail contact, employing a combination of experimental and numerical techniques. Initially, the study involves an in-depth analysis of time-domain signals from lateral and vertical accelerations of the carbody and bogie frame during a high-speed train field-test. The carbody vibration mode resulting from carbody hunting displays a swaying motion at a frequency of 1.5 Hz. Subsequently, a dynamic system model of the high-speed vehicle was established and the suspension mode of the model were verified. The frequency of the carbody upper sway motion is determined to be 1.39 Hz. Low effective conicity is induced when grinding wheel match with new rail or new wheel match with grinding rail. Under this low effective conicity, the hunting frequency of the vehicle is around 1.5 Hz, close to the frequency of the carbody upper sway motion. The coincidence of the hunting frequency and the upper sway motion frequency leads to the low-frequency swaying of the carbody. At last, the effects of wheel profiles, rail profiles and suspension parameters on the carbody hunting have been studied. The study demonstrates that addressing low-frequency carbody swaying can be achieved through targeted rail grinding. This process involves modifying the rail profile while ensuring careful grinding of the rail inner corner. Furthermore, it has been confirmed in the article that replacing suitable yaw dampers is also effective.

show abstract

Cavitation induced hydraulic yaw damper failure and its effect on railway vehicle dynamic stability

Cited by 2 publications

References 23 publications

Experimental and Numerical Investigation of Bogie Hunting Instability for Railway Vehicles Based on Multiple Sensors

Experimental and Numerical Investigation of Bogie Hunting Instability for Railway Vehicles Based on Multiple Sensors

Carbody hunting behaviour of high speed vehicles in low effective conicity of wheel-rail contact

Contact Info

Product

Resources

About