Study on the damping performance characteristics analysis of shock absorber of vehicle by considering fluid force

Lee, Choon-Tae; Moon, Byung-Young

doi:10.1007/bf02916174

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…Assuming that the internal oil pressure of the rebound chamber is P 1 the internal pressure of the compression chamber and air chamber is P 2 and P 3 respectively. By simplifying the complex physical model of the shock absorber, the shock absorber is equivalent to the hydraulic system which is composed of series and parallel of different valves in different chambers, so the solution of the damping characteristic of the shock absorber is converted to the force analysis (Lee and Moon, 2005) of the hydraulic system. Based on the analysis of the internal pressure field model, it is known that the magnitude of the damping force is related to the structure size of the valve system.…”

Section: Rebound Stroke Modelingmentioning

confidence: 99%

Effect of air chamber and oil properties on damping characteristics of single-tube pneumatic shock absorber

Liu

Xie

Zhang³

et al. 2018

IJSI

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Purpose-The shock absorber is an important component of vehicle suspension that attenuates the vehicle vibration. Its running state directly affects the performance of the vehicle suspension. The purpose of this paper is to quantitatively study the relationship between damping characteristics and air chamber and oil properties in single-tube pneumatic shock absorber. Design/methodology/approach-Combined with the principle of fluid dynamics and hydraulic transmission technology, the rebound stroke and compression stroke mathematical models, and damping characteristics simulation model are established to investigate the effect of the air chamber and oil property on damping characteristics. Findings-Research results show that the initial pressure of the air chamber is the key parameter which influences the damping characteristics of the shock absorber. The change of the initial pressure has more impact on damping force, and less impact on the speed characteristic; the initial volume of the air chamber almost has no effect on the damping characteristics. The density and viscosity of the oil have certain influence on the damping characteristics. Therefore, selecting suitable damping oil is very important. Originality/value-Using Matlab/Simulink software to build simulation models, its results are very accurate. The conclusions can provide a theoretical reference for the structure design of a single-tube pneumatic shock absorber.

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Section: Rebound Stroke Modelingmentioning

confidence: 99%

Effect of air chamber and oil properties on damping characteristics of single-tube pneumatic shock absorber

Liu

Xie

Zhang³

et al. 2018

IJSI

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“…To determine the second-order approximation for u; u 0 and u 1 , from Eqs. (20) and (23), must be substituted into Eq. ( 19…”

Section: Soft-non-resonant Excitation Analysis Using Msmmentioning

confidence: 99%

“…While there are many types of passive damper, passive variable dampers have been recently developed. Among the passive variable dampers, those with stroke and displacement/position dependent sensitivity have been studied in several works [15][16][17][18][19][20][21][22][23][24][25][26]. Fukushima et al [19] suggested that dampers should have a stroke dependent characteristic, such that for a given velocity, a longer stroke would give a greater force.…”

Section: Introductionmentioning

confidence: 99%

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Forced vibration analysis of a system equipped with the nonlinear displacement-dependent (NDD) damper

Jahanpour

Porghoveh²,

Ilbeigi³

2016

Scientia Iranica

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In this paper, the forced vibration analysis of a mass-spring system equipped with a Nonlinear Displacement-Dependent (NDD) damper is elaborated upon. To this end, the nonlinear governing di erential equation of the system is derived for two types of soft-and hard-periodic excitations. In order to obtain the displacement of the excited system, the approximate analytical solution of the governing equation is developed using the Multiple Scales Method (MSM). The proposed analytical formulations are performed for several cases of hard-and soft-excitation and are also veri ed by the numerical fourth-order Runge-Kutta method. Moreover, the performance of the NDD damper is analyzed and compared with the traditional linear damper used in both hard-and soft-excited vibration analyses. For the same external periodic force, a comparison has also been carried out between the responses of the hard-and soft-excitations. It is found that organizing the external force, based on its amplitude, into two types; soft-and hard-excitation, leads to a better estimated response in the forced vibration analysis. Moreover, the NDD damper has a superior performance in reducing vibration amplitude through tending to the steady-state solution, compared to the traditional linear damper.

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“…Several papers deal with modeling methods of automotive dampers, which are commonly referred to as shock absorbers [6,7,8]. One of the most significant contributions is due to Reybrouck, who presented a shock absorber model that has twenty one parameters that correspond to various physical properties and tuning possibilities of a standard automotive damper [7].…”

Section: Damper Modelingmentioning

confidence: 99%

A study on the efficiency improvement of a passive oil damper using an MR accumulator

2010

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This study describes the development, modeling, and testing of a hybrid damper for semi-active suspension. The goal of this study is to improve the performance of conventional passive oil dampers using a magneto-rheological (MR) accumulator that consists of a gas accumulator and an MR device. The level of damping is continuously variable by means of control of the applied current in an MR device that is fitted to a floating piston that separates the gas and oil chamber. A small MR device is used to resist the movement of the floating piston. At first, a mathematical model that describes all flows within the damper is formulated and developed in Matlab/Simulink. The MR device is also devised. A mathematical model is adopted to characterize the performance of the device. The formulas derived for the different components of the damper force are combined into a full damper model. Then, the applicability of the MR device to a conventional passive oil damper is tested in a manufactured test environment and evaluated in terms of the damping force vs. the piston velocity. From the results, it is possible to ascertain the MF device's capability to work as a damper that can supply a variable damping force. Moreover, this research affords a lot of new information about the applicability of MR devices and improvement of the damping force.

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Study on the damping performance characteristics analysis of shock absorber of vehicle by considering fluid force

Cited by 9 publications

References 5 publications

Effect of air chamber and oil properties on damping characteristics of single-tube pneumatic shock absorber

Effect of air chamber and oil properties on damping characteristics of single-tube pneumatic shock absorber

Forced vibration analysis of a system equipped with the nonlinear displacement-dependent (NDD) damper

A study on the efficiency improvement of a passive oil damper using an MR accumulator

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