Vertical Vibration Suppression System for Railway Vehicles Based on Primary Suspension Damping Control — System Development and Vehicle Running Test Results —

Sugahara, Yoshiki; Watanabe, Nobuyuki; Takigami, Tadao; Koganei, Reiko

doi:10.2219/rtriqr.52.13

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Variable primary vertical dampers, used for damping force control, are mounted parallel to the primary (coil) springs. Each car is equipped with eight dampers, a controller, and four accelerometers [9].…”

Section: Basic Architecturementioning

confidence: 99%

Suppression of Vertical Vibration in Railway Vehicle Carbodies Through Control of Damping Force in Primary Suspension: Presentation of Results From Running Tests With Meter-Gauge Car on a Secondary Line

Sugahara

Kojima

2018

WIT Transactions on the Built Environment

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To improve vertical ride comfort in railway vehicles, the suppression of vertical bending-mode vibration and rigid-body-mode vibration in the carbody is essential. Primary suspension damping control systems, designed to reduce bending mode vibrations in carbodies for high-speed trains, have been proposed in the past. These systems consist of variable vertical dampers affixed to the primary suspension, accelerometers attached to the bogie frames, and a controller. Results from vehicle running tests carried out on a number of Shinkansen lines demonstrated that these systems reduced the power spectral density (PSD) peak value of vertical carbody vibration accelerations in the first-bending-mode by 80 per cent compared to when the system was not used. This paper reports on the application of this system to a meter-gauged vehicle. Vehicle running tests were carried out on a secondary meter-gauge line at moderately high running speeds (about 100 km/h or lower). Test results showed that the system reduced the PSD peak of vertical vibration accelerations stemming from bending-mode vibrations of the carbody by almost 90 per cent thanks to an LQG controller tuned for reducing bending-mode vibrations. When vehicles run at low speed (about 60 km/h) on secondary lines, the rigid-body-mode vibrations of the carbody in the 1-2 Hz frequency range tend to increase from time to time. The system was therefore also applied to reduce these vibrations. Results from vehicle running tests applying the LQG controller that had been re-tuned for reducing rigid-body-mode vibrations, showed that the PSD peak in vibration accelerations at 1.2 Hz was reduced by half.

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Section: Basic Architecturementioning

confidence: 99%

Suppression of Vertical Vibration in Railway Vehicle Carbodies Through Control of Damping Force in Primary Suspension: Presentation of Results From Running Tests With Meter-Gauge Car on a Secondary Line

Sugahara

Kojima

2018

WIT Transactions on the Built Environment

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“…While taking the vehicle or walking on the evacuation platform, a notable vibration response may be present, which may cause human discomfort or even reduce the safety and service life of the structure [12][13][14]. Thus, reducing the system's dynamic response [15][16][17][18][19][20][21][22][23] and improving the comfort of humans [24][25][26][27] have been researched topics of great concern. Unlike the traditional monorail systems and railways, most MTTS have adapted elevated steel structures with lightweight beams and heavy-weight vehicles, showing the characteristics of small dead loads and large live loads.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Limit of the Lateral Fundamental Frequency and Comfort Analysis of a Straddle-Type Monorail Tour Transit System

Guo

Liao

et al. 2022

Applied Sciences

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The straddle-type monorail tour transit system is a light overhead steel structure, and the lateral stiffness is generally low. However, the limit of the lateral natural vibration frequency is not clear in the current codes of China, and designers may ignore it. Weak lateral stiffness will lead to a violent vibration during vehicle operation and crowds walking, affecting human comfort and structural safety. Based on a practical project, we tested the acceleration of a monorail vehicle under full load conditions, and its running stability and ride comfort were assessed. Then, the impact of pedestrians on lateral vibration under some working conditions was measured and analyzed. Furthermore, the influence of different structural parameters on the lateral fundamental frequency was investigated. The results showed the following: (i) The vehicle’s running stability and riding comfort was good. However, human comfort was poor due to the weak lateral stiffness of the structure, which was affected by human-induced vibration. (ii) The comprehensive response of the structure increased with the increase in walking frequency, increased with the increase in the number of people working or weight, and the growth speed slowed down. (iii) The structural stiffness was most sensitive to the change in steel column diameter. (iv) The recommended value of the lateral fundamental frequency limit for different spans of the straddle-type monorail tour transit system was put forward. The recommended lower limit of fundamental frequency for a 15 m span is 5.0 Hz, for an 18 m span it is 3.5 Hz, and for a 25 m span it is 2.8 Hz.

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“…The structural vibrations of flexible carbodies have been the object of research in a large number of studies [15,[17][18][19][20][21], and the reduction or control of these vibration so as to improve the ride comfort have been dealt with in numerous research [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] that can be grouped as follows: approaches concerning the isolation of vibrations, developed on passive, semi-active and active concepts; and approaches regarding the damping of the carbody vibrations, developed in turn on passive or active concepts [39,40]. Nevertheless, to the best of the authors' knowledge, there is no study that features the contribution of the vibration structural modes upon the vibration behaviour of the railway vehicle carbody.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bending Vibration on the Vertical Vibration Behaviour of Railway Vehicles Carbody

Dumitriu

Dihoru

2021

Applied Sciences

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The topic of reducing structural vibrations in the case of flexible carbodies of railway vehicles has been intensively studied, but it is still an active research topic thanks to the importance of the perspective of improving the ride comfort. However, no study has been identified in the specialty literature to feature the contribution of the vibration structural modes upon the vibration behaviour of the railway vehicle carbody. The structural vibration modes of the flexible carbodies are particularly complex; however, the first vertical bending mode holds great significance in terms of the ride comfort. This paper analyses the influence of the first vertical bending mode on the vibration behaviour in three reference points of the railway vehicle carbody in correlation with the carbody flexibility, the vehicle velocity and the suspension damping. This study relies on comparisons between the results of the numerical simulations obtained for a ‘flexible carbody’ type model of the vehicle and the ones obtained for a ‘rigid carbody’ type model. The first part of this study analyses the characteristics of the vertical vibrations behaviour of the flexible carbody based on the dynamic response of the vehicle and expressed as the acceleration power spectral density. In the second part, the influence of the vertical bending on the vertical vibrations level of the carbody is analysed using the root mean square of the vertical acceleration.

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Vertical Vibration Suppression System for Railway Vehicles Based on Primary Suspension Damping Control — System Development and Vehicle Running Test Results —

Abstract: Suppression of vertical bending vibration is essential to improve

Cited by 10 publications

References 16 publications

Suppression of Vertical Vibration in Railway Vehicle Carbodies Through Control of Damping Force in Primary Suspension: Presentation of Results From Running Tests With Meter-Gauge Car on a Secondary Line

Suppression of Vertical Vibration in Railway Vehicle Carbodies Through Control of Damping Force in Primary Suspension: Presentation of Results From Running Tests With Meter-Gauge Car on a Secondary Line

The Limit of the Lateral Fundamental Frequency and Comfort Analysis of a Straddle-Type Monorail Tour Transit System

Influence of Bending Vibration on the Vertical Vibration Behaviour of Railway Vehicles Carbody

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