Due to local resonances, high vibration levels occur frequently in high-speed train floor, which impact on the ride comfort negatively. A method control excessive with multiple dynamic absorbers (DVAs) is presented. Firstly, possible causes of are investigated operational and modal tests. Then a model vehicle body DVAs established based superposition method. It found that strong peak at low frequency dominated by single mode, can be attenuated under-frame equipment as DVA. In region between...

Owing to the significant contribution of flexible modals in rigid-flexible multiple body system (MBS) dynamics, model updating before flex-body generation is necessary. Herein, a model-updating method based on measured frequency response function (FRF) proposed modify finite element (FEM). To address complexity responses and high cost computation, Kriging surrogate with multi-objective considering magnitude shape each curve proposed. Thereafter, parameters are optimised calibrate FEM updated...

Abstract The sufficiency and integrity of dynamic stress spectrum will affect the accuracy analysis result. It is necessary to extrapolate them from short term long while retaining probability distribution characteristics. extrapolation fatigue life assessment bogie frame were studied, a test point was taken as case study. First, optimal bandwidth determination in two‐dimensional KDE (kernel density estimation) studied. Second, gray incidence degree method proposed evaluate...

Abstract Excitation force of under-chassis active equipment railway vehicles has a significant impact on the floor vibration car body. In order to improve accuracy excitation identification in engineering practice, new method was proposed by applying modified Sage-Husa adaptive Kalman filter (MSHAKF). First, advantages MSHAKF over conventional (CKF) are introduced. Simulation shows that excellent exactness and robustness for identification. Finally, test device identifying established. The...

During the service life of metro vehicles, cracks frequently appear at root motor seats. This indicates previous antifatigue designs are unable to cover actual operating environment. Some individual loads, such as vibration, have been ignored or wrongly understood, which leads occurrence local insufficient fatigue frame. To illustrate influence vibration on bogie frame, a vehicle was taken an example: first, precise finite element model frame established, and its correctness verified; then,...

Abstract The accuracy of the physical parameters and excitation under-chassis equipment has a significant impact on investigations coupled vibration vehicle body equipment. In this study, an isolator test bench is used to develop parameter identification method based free acceleration response forced response. mass center gravity position can be obtained first through static load test, then, inertia dynamic test. Identification directly affects results. larger frequency ratio, smaller error...

A power dispersive high-speed electric multiple-unit (EMU) train requires the installation of traction equipment under carbody. As speed trains increases, demand for is increasing, and weight size have increased accordingly. To adapt to research development higher-speed EMU trains, this proposes use a multi-point connection scheme installing under-chassis equipment. First, static deflection supporting reaction force each hanging point are obtained based on analysis, it found that increasing...

As one of the facilities adjacent to track, bolts on high-speed railway sound barrier are an important structure ensure safe operation railway. However, traditional manual inspection method has shortcomings, so automated and intelligent bolt become a hot spot in research development. In this paper, wireless acceleration sensing system (WASS) based MEMS accelerometer is established, vibration response change under loosening analyzed as propose new method. The experimental results show that...

Abstract A power dispersive high-speed electric multiple-unit (EMU) train requires the installation of traction equipment under carbody. As speed trains increases, demand for is increasing, and weight size have increased accordingly. To adapt to research development higher-speed EMU trains, this proposes use a multi-point connection scheme installing under-chassis equipment. First, static deflection supporting reaction force each hanging point are obtained based on analysis, it found that...

The sound barrier of high-speed railway will produce structural vibration when the train passes, and as its service time increases, problem disease gradually appears. At same time, intensify, resulting in frequent dangerous accidents. Based on lack intelligent structure inspection monitoring technology, this study proposes an system (IVMS) based MEMS accelerometer, first attempts to explore relationship between change one main diseases, namely bolt loosening. By conducting experiments...

Abstract：Aiming at the problem of identifying physical parameters railway vehicle, state matrix vehicle system is obtained through space theory and modal theory, then two methods vehicles are proposed, namely, additional mass method proportional relationship method.The can identify all but a specific needs to be added system.The does not require mass, remaining identified on premise that frame quality parameter known.The directional excitation conditions for identification designed, verified...

Aiming at the problem of identification physical parameters railway vehicles, this paper proposes a method on-site based on drop test. The parameter is verified by simulation recognition errors different signal types are compared, and results show that has high accuracy, acceleration velocity have better effect than displacement signal.

Abstract The excitation force identification of multiple devices in railway vehicles is studied. vertical dynamic coupling model between the flexible car body high-speed train and under-chassis active device with itself established based on modal superposition method. from identified Kalman filter. A order selection method developed for improving accuracy tolerance index. effects single including single-frequency steady-state, multi-frequency impact, sawtooth wave square forces are analyzed....