Nonlinear dynamics of a vehicle with a displacement-sensitive mono-tube shock absorber

Łuczko, Jan

doi:10.1007/s11071-020-05532-7

Cited by 12 publications

(5 citation statements)

References 27 publications

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“…The shock absorber is used to absorb the vibration from the road, and its performance directly affects the ride comfort and handling stability of the vehicle [1][2][3][4][5]. The vibration absorption performance of a shock absorber is determined by its damping characteristics, which is closely related to the deformation of the valve slice in the shock absorber valve system [6][7].…”

Section: Introductionmentioning

confidence: 99%

Research on deformation of valve slice of automobile shock absorber

Li¹,

Yuan²

2023

J. vibroeng.

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Based on the bending deformation theory of cantilever beam, the mathematical model of bending deformation of single valve slice under uniform load is proposed and deduced by using the microbeam element method (MEM). The accuracy and reliability of the mathematical model established by the MEM and the small deflection method (SDM) are verified through the finite element simulation comparison. The results show that the valve slice deformation mathematical model under uniform load established by using the deformation theory of the MEM is suitable not only for the small deflection deformation (SDD) but also for the large deflection deformation (LDD) of the valve slice, and can reflect the dynamic deformation characteristics of the valve slice more truly than the SDM, which provides a certain theoretical basis for the deformation study of single valve slice. At the same time, the mathematical model is used to simulate the deformation law of the valve slice when the thickness, inner radius and outer radius change. The conclusion provides technical support for the design and performance prediction of the shock absorber.

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Section: Introductionmentioning

confidence: 99%

Research on deformation of valve slice of automobile shock absorber

Li¹,

Yuan²

2023

J. vibroeng.

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“…Simulation results show that the new damper has the same performance as the semi-active control damper. Łuczko et al [30,31] proposed a modification of the classical twin-tube shock absorber with an additional cylinder to improve the driving comfort of vehicles. The oil flow between the chambers of the additional cylinder depends on relative displacements of the auxiliary piston.…”

Section: Introductionmentioning

confidence: 99%

A frequency-dependent variable-damping control based variable-orifice damper for smart base-isolation system

Li¹,

Wen²,

Shi³

et al. 2022

Smart Mater. Struct.

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Damping devices are commonly used in the isolation layer of base-isolated structures to provide additional damping to control the structural responses. Normally, large damping for the isolation layer is useful to minimize the resonance effect under low-frequency ground motions, and small damping is preferred to reduce the structural responses under high-frequency ground motions. Traditional passive dampers are widely adopted in engineering practice. Due to the fixed damping characteristic, however, the performance of base-isolated structures with passive dampers cannot stay optimal under ground motions with different frequency characteristics. To realize an optimal control of base-isolated structures, semi-active control has been increasingly valued for its efficiency and intelligence to adjust the damping characteristics based on feedback information from the structure and ground motion. However, a large number of sensors and hardware components are required for semi-active control, which makes the system complex and costly. In this paper, a variable-orifice damper (VOD) for smart base-isolation system is proposed. The VOD can adaptably adjust its damping according to the frequency of the ground motion without additional power or sensors. Theoretical analysis and sinusoidal excitation tests were carried out to investigate the behavior of VOD. A series of numerical simulations of a base‐isolated structure equipped with the proposed VOD and subjected to ground motions are also conducted. A semi-active control with ON-OFF strategy, and two passive controls (passive-on and passive-off) are conducted for comparison. The simulation results show that the VOD can result in an optimal control under ground motions with different frequency characteristics.

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“…Most recent works go further on suspension control by implementation of active and semi-active systems, often with the use of magneto rheological dampers [8,12,13] which can considerably reduce the vibration levels, improving ride quality. However, such systems have disadvantages compared to passive systems, since they present issues on cost, complexity and reliability [14][15][16][17], what still secures a wide use of passive systems for cheaper cost and reliable performance [18]. In order to make passive systems achieve a comparable level of comfort, many recent studies focus on damping properties [6,17,[19][20][21][22][23] or modified constructions [1,14,15,24], where all studies achieve a better suspension ride.…”

Section: Introductionmentioning

confidence: 99%

“…However, such systems have disadvantages compared to passive systems, since they present issues on cost, complexity and reliability [14][15][16][17], what still secures a wide use of passive systems for cheaper cost and reliable performance [18]. In order to make passive systems achieve a comparable level of comfort, many recent studies focus on damping properties [6,17,[19][20][21][22][23] or modified constructions [1,14,15,24], where all studies achieve a better suspension ride. More expressive results achieved a 31% reduction in sprung mass acceleration by using asymmetrical dampers [19]and obtained 20% of sprung mass acceleration reduction by the change in the bleed orifice area of the inside piston [1].…”

Section: Introductionmentioning

confidence: 99%

“…More expressive results achieved a 31% reduction in sprung mass acceleration by using asymmetrical dampers [19]and obtained 20% of sprung mass acceleration reduction by the change in the bleed orifice area of the inside piston [1]. It is also possible to achieve a reduction in the amplitude of sprung mass vibrations using an oil bypass through shock chambers [14]. To the purpose of this work, a passive suspension for a Baja SAE vehicle, a small off-road vehicle designed by students to attend college competitions, will be analysed in terms of vibration level and comfort safety during extreme ride conditions.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of adjustable damping in the ride comfort of a baja SAE vehicle

Colpo

Souza

2020

J Braz. Soc. Mech. Sci. Eng.

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The paper presents a case study of a small off-road vehicle and its response to ground excitations regarding the geometrical suspension properties and the variation of adjustable damping parameters, that can change restoring force in fast bump, slow bump and rebound zones. The shock absorber behaviour in force-velocity graphs is obtained from experimental data and introduced in the simulation by a lookup table strategy, without a mathematical model describing the damping behaviour. The analysis is done through a seven degrees-of-freedom model, describing the full vehicle, and assembled in a state space form. Ground excitations are inserted as wheel displacement from random road vibrations and a single road bump, with the use of a roller contact model. The acceleration transmitted to the driver is compared to comfort standards to verify possible discomfort or danger to health damages in long exposure. The outputs are validated with linear potentiometers, showing that the model can accurately predict the shock absorbers behaviour and, consequently, the accelerations transmitted to the driver. To the shock absorbers studied, low bump velocities do not affect significantly exposure risk to vibrations and present a small comfort improvement. Otherwise, through road bumps, a softer regulation ensures a better performance, reducing sprung mass displacement in 31% and accelerations transmitted in 33% at the shock absorber regulation range.

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Nonlinear dynamics of a vehicle with a displacement-sensitive mono-tube shock absorber

Cited by 12 publications

References 27 publications

Research on deformation of valve slice of automobile shock absorber

Research on deformation of valve slice of automobile shock absorber

A frequency-dependent variable-damping control based variable-orifice damper for smart base-isolation system

Assessment of adjustable damping in the ride comfort of a baja SAE vehicle

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