Practical Use of a Vehicle Vibration Control System using Secondary Variable Vertical Dampers on a Sightseeing Train

Sugahara, Y.; Kojima, T.; Morimitsu, T.; Matsunaga, S.; Igarashi, Y.; Akami, Y.

doi:10.4203/ccp.98.31

Cited by 3 publications

(5 citation statements)

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“…A running test was conducted with a meter-gauge vehicle on a commercial line. The vehicle was equipped with a vibration control system with secondary variable vertical dampers [2]. The controller controls the damping force of the variable vertical dampers (Fig.…”

Section: Test Methodsmentioning

confidence: 99%

“…In an attempt to verify whether the proposed fault detection method could be effectively applied to a vibration control system with variable secondary vertical dampers [2], a test system was devised as shown in Fig. 10.…”

Section: Fault Detection System Configurationmentioning

confidence: 99%

“…As a way to mitigate vertical vibrations and improve the ride comfort of railway vehicles, work has been done developing a vehicle vibration control system whereby variable oil dampers are used to control the vertical damping force of the vehicle's primary or secondary suspensions [1] [2]. For such a system to be put into practical use, a strategy must be found to detect system faults in order to disable the control function.…”

Section: Introductionmentioning

confidence: 99%

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Fault Detection of Vertical Dampers of Railway Vehicle Based on Phase Difference of Vibrations

Kojima¹,

Sugahara²

2013

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This paper presents a technique for damper fault detection based on the phase difference between the bounce and pitch motions of bogie frames or a car body obtained with inertial sensors. This method avoids the need for mounting sensors in oil dampers. The result of vibration excitation tests with one vehicle on a testing plant demonstrated that the faults in a primary vertical damper were detectable by evaluating the phase difference between the bounce and pitch motions of the bogie frames. The results of running tests on a meter-gauge line demonstrated that secondary vertical damper faults were also detectable based on the phase difference between the bounce and pitch motions of the car body.

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Section: Test Methodsmentioning

confidence: 99%

Section: Fault Detection System Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fault Detection of Vertical Dampers of Railway Vehicle Based on Phase Difference of Vibrations

Kojima¹,

Sugahara²

2013

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“…Active or semi-active suspension systems (hereinafter collectively called "vibration control systems") are known to be highly effective in reducing carbody vibrations, and for improving ride comfort for passengers [1], to the extent that now, in Japan, almost all Shinkansen vehicles and some express train vehicles have been equipped with lateral vibration control systems [2], [3]. In addition to this, a vertical vibration control system using variable secondary vertical dampers was developed by the authors of this paper [4], [5]. This second system is effective in reducing vertical rigid-body-mode vibrations and has been adopted on some sightseeing trains and luxury trains which run on both main lines and secondary lines [6].…”

Section: Introductionmentioning

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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“…The authors of this paper developed a secondary suspension vibration control system with variable vertical hydraulic dampers. This system was then successfully adapted to an actual sightseeing limited express train which has coil springs in the secondary suspension [4]. Subsequently, this system has been advanced so that the system can be applied to more recent vehicles which have air springs in the secondary suspension; the variable damper was improved in terms of responsiveness, and the bending vibration of the car body can be controlled simultaneously along with rigid-body-mode vibrations, etc.…”

Section: Introductionmentioning

confidence: 99%

Development of a vertical semi-active suspension system using variable hydraulic dampers

Sugahara¹,

Kojima²,

Akami³

et al. 2016

WIT Transactions on the Built Environment

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Plans are being made in Japan to launch luxury cruise trains for sightseeing tours. These trains are expected to use both main and secondary railway lines on the network. Secondary lines in particular can sometimes be subject to significant irregularities because maintenance criteria are lower than for mainlines. As a result, rigid-body-mode vibrations, and in particular those in the 1-2 Hz frequency range, tend to increase, which may result in reduced ride comfort. As such, a secondary suspension damping control system using variable vertical hydraulic dampers was developed to mitigate this type of vibration. The system consists of four dampers, a controller, and four accelerometers. Variable vertical dampers are mounted parallel to the secondary air springs. The damping force can be controlled by the command current. The control algorithm which controls the variable dampers is based on the sky-hook control theory. The controller is also equipped with an algorithm which is geared to monitor the state of the damper, which does not require the use of sensors in the system. The algorithm examines the phase difference between the bounce and pitch vibration modes of the car body with the accelerometers used to control the dampers. When a fault is detected, a fail-safe function is activated, stopping damper controlling automatically. Vehicle running tests using an actual vehicle equipped with the control system were carried out. In the tests, the system reduced the peak in the power spectrum density for vertical vibration acceleration due to the rigid-body-mode vibration of the car body by almost 40 per cent compared to when the system was not used.

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Practical Use of a Vehicle Vibration Control System using Secondary Variable Vertical Dampers on a Sightseeing Train

Cited by 3 publications

References 0 publications

Fault Detection of Vertical Dampers of Railway Vehicle Based on Phase Difference of Vibrations

Fault Detection of Vertical Dampers of Railway Vehicle Based on Phase Difference of Vibrations

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

Development of a vertical semi-active suspension system using variable hydraulic dampers

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