Comfort enhancement by an active vibration reduction system for a flexible railway car body

Schandl, Gerhard; Lugner, Peter; Benatzky, Christian; Kozek, Martin; Stribersky, Anton

doi:10.1080/00423110601145952

Cited by 62 publications

(34 citation statements)

References 9 publications

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“…Tomioka et al [17] proposed an analytical method to investigate the 3D flexural vibration of railway vehicle carbodies in which the carbody is modelled as a box-type structure consisting of plates and beams. To investigate the improvement in the ride comfort of lightweight railway vehicles by means of an active vibration reduction system using piezo-stack actuators, Schandl et al [6] used a MBM of the vehicle. Diana et al [4] developed a complex FEM of the vehicle, suitable for reproducing its dynamic behaviour in the 0 … 50 Hz frequency range, especially with respect to the ride comfort problem.…”

Section: Models Of 'Flexible Carbody' Typementioning

confidence: 99%

Modelling of structural flexibility of the railway vehicles carbody

Dumitriu

Crăciun

2017

MATEC Web Conf.

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Abstract. The accuracy in the models of railway vehicles in the ride comfort evaluation mainly derives from the modelling of the carbody structural flexibility. The former part of the paper herein reviews the 'flexible carbody' type methods used to represent the carbody structural flexibility in the approaches targeting the identification of certain methods to reduce the flexible vibrations in the carbody so as to improve the ride comfort of the railway vehicles. What seems to apply are the simple beam models such as Euler -Bernoulli or Timoshenko, structure type models and detailed multi-body, finite-element models or combinations of multi-body and finite-elements models. The latter part will feature a contrastive analysis regarding the comfort index coming from the numerical simulations based on 'rigid carbody' and 'flexible carbody' original models. It is highlighted that the comfort performance of a railway vehicle evaluated on the basis of a 'rigid carbody' mode is overrated.

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Section: Models Of 'Flexible Carbody' Typementioning

confidence: 99%

Modelling of structural flexibility of the railway vehicles carbody

Dumitriu

Crăciun

2017

MATEC Web Conf.

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“…Results indicate that high bending frequency can alleviate the resonance of the car body. And some previous research aims to reduce the flexible vibration of car body with different control methods, such as Kamada et al 8 used piezoelectric actuators to suppress bending vibration of high-speed railway vehicle and Schandl et al 9 improved passengers comfort through designing an active vibration reduction system for flexible car body. However, few studies to date have investigated the means by which to improve modal parameters of car body.…”

Section: Introductionmentioning

confidence: 99%

Analysis of modal frequency optimization of railway vehicle car body

Sun

Zhou

Gong

et al. 2016

Advances in Mechanical Engineering

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High structural modal frequencies of car body are beneficial as they ensure better vibration control and enhance ride quality of railway vehicles. Modal sensitivity optimization and elastic suspension parameters used in the design of equipment beneath the chassis of the car body are proposed in order to improve the modal frequencies of car bodies under service conditions. Modal sensitivity optimization is based on sensitivity analysis theory which considers the thickness of the body frame at various positions as variables in order to achieve optimization. Equipment suspension design analyzes the influence of suspension parameters on the modal frequencies of the car body through the use of an equipment-car body coupled model. Results indicate that both methods can effectively improve the modal parameters of the car body. Modal sensitivity optimization increases vertical bending frequency from 9.70 to 10.60 Hz, while optimization of elastic suspension parameters increases the vertical bending frequency to 10.51 Hz. The suspension design can be used without alteration to the structure of the car body while ensuring better ride quality.

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“…The conventionally used methods of suppressing bending vibration in car bodies include dissipating vibration energy by introducing some damping materials or dynamic dampers in the car body [4,5], and directly applying a damping force to the car body via piezoelectric elements attached to it [6,7]. Moreover, the control of actuators or variable dampers introduced in the secondary suspension [8][9][10][11] and the control of the active mass damper attached to the car body and actuators attached to the secondary suspension can be used as methods to simultaneously suppress bending and rigid-body-mode vibrations in car bodies [12].…”

Section: Introductionmentioning

confidence: 99%

Suppression of vertical bending and rigid-body-mode vibration in railway vehicle car body by primary and secondary suspension control: Results of simulations and running tests using Shinkansen vehicle

Sugahara

Kazato

Koganei

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part F:

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Abstract:To improve ride comfort in railway vehicles, the suppression of vertical bending vibration and rigid-body-mode vibration in the car body is essential. In this paper, a system is proposed that aims to reduce bending and rigid-body-mode vibration simultaneously by introducing damping control devices in the primary and secondary suspensions. The technique involves a control system of primary vertical dampers and air springs; the former are used to suppress the first bending mode vibration; the latter, to suppress the rigid-body-mode vibration. The results of both simulations and vehicle running tests on the Sanyo-Shinkansen line demonstrate that this system reduced vertical vibrations in the bogies and the car body using the sky-hook control theory. In the running tests in particular, the system reduced the vertical vibration acceleration PSD peak value in the first bending mode to almost 20 per cent and in the rigid body mode to almost 50 per cent compared with the case when the system was not used. As a result, the ride quality level L T (a widely used index of ride comfort in Japan) decreased by at least 3 dB, indicating greater ride comfort.

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Comfort enhancement by an active vibration reduction system for a flexible railway car body

Cited by 62 publications

References 9 publications

Modelling of structural flexibility of the railway vehicles carbody

Modelling of structural flexibility of the railway vehicles carbody

Analysis of modal frequency optimization of railway vehicle car body

Suppression of vertical bending and rigid-body-mode vibration in railway vehicle car body by primary and secondary suspension control: Results of simulations and running tests using Shinkansen vehicle

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