An active vibration damping system of a driver's seat for off-road vehicles

Nevala, Kalervo; Järviluoma, Markku

doi:10.1109/mmvip.1997.625239

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…The pitch plane suspension system is a physical model of vehicle seat suspension systems. The system has been widely used by researchers to study the behaviour of vehicles, particularly off-road vehicles, where the vibration control objective is to reduce the vertical force transmitted from the unevenness of terrain, driving speed, loading, and driving style, etc to the driver seat [12]. This transmitted force cannot only reduce the working efficiency of drivers but also has a significant impact on the drivers' health, as it causes stress to joint and spine and results in driver backache [12].…”

Section: Introductionmentioning

confidence: 99%

MR damper based implementation of nonlinear damping for a pitch plane suspension system

Laalej¹,

Lang²,

Sapiński³

et al. 2012

Smart Mater. Struct.

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Suppression of vibration transmission from working machineries and other sources is important for the normal operation of a wide range of engineering systems. Traditionally, viscous dampers with approximately linear characteristics are often used to address the issue. However, this solution can have the problem of not being able to reduce the vibration transmission over the whole range of frequencies. In recent studies, the authors have revealed, by both theoretical analysis and experimental test, that nonlinear damping can be applied to resolve the problem. The present study is concerned with the exploitation of this beneficial effect of nonlinear damping to the vibration control of a pitch plane suspension system. A magneto-rheological (MR) damper based implementation of nonlinear damping is applied to provide a novel solution to the pitch plane system vibration control problem. Simulation studies are conducted to demonstrate the effectiveness of the MR damper implementation, and the beneficial effect of nonlinear damping on the pitch plane suspension system vibration control.

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Section: Introductionmentioning

confidence: 99%

MR damper based implementation of nonlinear damping for a pitch plane suspension system

Laalej¹,

Lang²,

Sapiński³

et al. 2012

Smart Mater. Struct.

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“…When the load force drastically changes, the SMEHS is easy to overshoot and oscillation, which means that the SMEHS does not have enough damping. Some control schemes were developed by researchers to increase system damping [6][7][8]. Generally, these schemes fall into two categories.…”

Section: Introductionmentioning

confidence: 99%

Robust Backstepping Control with Active Damping Strategy for Separating-Metering Electro-Hydraulic System

Su-hong

Huang

et al. 2019

Applied Sciences

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Electro-hydraulic servo systems are widely used in industrial applications. The load greatly affects the dynamic response of the separating-metering electro-hydraulic system. The current researches mainly aim at the system tracking performance for the hydraulic servo system, but the researches on the damping characteristics are relatively less. For energy-saving reasons, the metering-out chamber is often maintained near a lower pressure. The system will oscillate when the load drastically changes. The active damping strategy is proposed in this work in order to increase the damping and suppress the oscillation in separating-metering electro-hydraulic system. The effectiveness of the active damping strategy is proven by mathematical derivation. Furthermore, the nonlinear mathematical model of the separating-metering electro-hydraulic system is built, and a robust backstepping controller that combines the tracking differentiator and nonlinear disturbance observer is designed. The experimental results indicate that the system oscillation is suppressed and the proposed controller has good tracking accuracy.

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“…15 Several methods based on tracking control of linear displacement sensors or accelerometers mounted on the oscillating parts have been successfully implemented in applications such as active suspensions, 16,17 vehicle braking systems, 18 and active damping seats. 19,20 More relevant to the case of load-handling hydraulic machines are the works made by Krus and Gunnarsson, 21 or the optimization-based and adaptive techniques exploited in Huang and Wang, 22 Yun and Cho, 23 Lee and Srinivasan, 24 and Hori et al 25 for hydraulic actuators. Adaptive nonlinear techniques for motion control of hydraulic actuators were also studied by Yao and colleagues 26,27 An important aspect of the above-mentioned studies is their focus, which is limited to the oscillations of the machine body/implements, while payload oscillations are not considered in the analysis.…”

Section: Introductionmentioning

confidence: 99%

Payload oscillation reduction in load-handling machines: A frequency-based approach

Bianchi

Ritelli

Vacca

2017

Proceedings of the Institution of Mechanical Engineers, Part I:

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This article presents an innovative pressure feedback method to address undesired payload oscillations in hydraulic load-handling machines, which have a negative impact on both machine productivity and safety. Tracking control techniques in these machines are often not applicable due to the difficulty or the cost associated with the installation of the feedback sensors on the payload. In this work, by means of pressure sensors installed on the hydraulic system, the payload oscillation frequency is first detected by analyzing the frequency content of the measured pressure and then counteracted through a sinusoidal-based excitation command on the machine actuator. The work particularly addresses the challenges related to the use of the same actuator for detecting and quantifying the oscillation (in both frequency and amplitude) and for reducing the payload oscillations. In fact, interference on the feedback pressure signal due to the control action is present. Experimental results on a truck-mounted hydraulic crane show how the proposed technique permits to reduce payload oscillation in order of 50%, which is comparable to other less-practical tracking control techniques.

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An active vibration damping system of a driver's seat for off-road vehicles

Cited by 9 publications

References 2 publications

MR damper based implementation of nonlinear damping for a pitch plane suspension system

MR damper based implementation of nonlinear damping for a pitch plane suspension system

Robust Backstepping Control with Active Damping Strategy for Separating-Metering Electro-Hydraulic System

Payload oscillation reduction in load-handling machines: A frequency-based approach

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