Influence of shock absorber temperature on vehicle ride comfort and road holding

Павлов, Н. В.

doi:10.1051/matecconf/201713302006

Cited by 15 publications

(5 citation statements)

References 8 publications

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“…In previous scientific research, shock absorber tests results could be found that take into account temperature [5,10,14,18] and their impact on the driving comfort of the user [13]. Studies of the shock absorbers filled with numerous types of fluids were also presented in [12], where the authors presented their heating characteristics during operation with a constant amplitude and frequency.…”

Section: Highlights Abstractmentioning

confidence: 99%

The influence of temperature on the damping characteristic of hydraulic shock absorbers

Hryciów¹,

Rybak²,

Gieleta³

2021

Eksploatacja i Niezawodność – Maintenance and Reliability

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This paper presents the results of bench-tests and calculations assessing the influence of temperature on the performance of a two-pipe hydraulic shock absorber. The shock absorber prepared for the tests was cooled with dry ice to a temperature corresponding to that associated with the average winter conditions in a temperate climate. The temperature range of the shock absorber during testing was ensured via equipping it with a thermocouple and monitoring it with a thermal imaging camera. During testing, the shock absorber was subjected to kinematic forces of a selected frequency with two different, fixed displacement amplitudes. The results of the tests showed a direct correlation between the decrease of component resistance at lower temperatures. The rate of change in resistance was higher at lower temperatures. It was also found that the energy dissipated in one shock cycle decreased linearly with an increasing temperature. Finally, a method for determining the ideal use temperature of the shock absorber for the assumed operating conditions was also presented.

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Section: Highlights Abstractmentioning

confidence: 99%

The influence of temperature on the damping characteristic of hydraulic shock absorbers

Hryciów¹,

Rybak²,

Gieleta³

2021

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…The interaction between the tyre and the road surface is a source of vibrations. These vibrations affect the ride and the vibro-acoustic comfort as well as the road holding [1,2]. They depend on the tyre characteristics, which are similar to those of air-springs [3] for frequencies below 30 Hz.…”

Section: Overview Of the Problem And Setting The Aimmentioning

confidence: 99%

Study of the vibrational behaviour of the components of a car suspension

Georgiev

Kunchev

2018

MATEC Web Conf.

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The paper presents a study of the vibrational behaviour of a car suspension in the frequency range from 50 to 200 Hz. The vehicle has a torsion spring suspension. The aim of the study is to provide a numerical approach, which evaluates the impact of the tyre vibration characteristics and the elastic properties of suspension elements on the vibrational behaviour of the “tyre-suspension-body” system. The object of the study are the elements of the suspension – stub-axle, upper and lower suspension arms, strut rod, torsion bar and others. The suspension is equipped with pneumatic tyres with different vibration characteristics. Laboratory experiments are done. The tyre contact patch is disturbed by harmonic force. The accelerations of the wheel axle and specific points of the suspension are obtained. A numerical model of the system is created by using the Finite Element Method available in SolidWorks Simulation software. The model allows to determinate the accelerations at different points of the suspension. The results of the experimental and theoretical studies are compared. The values obtained in the two studies are similar.

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“…Indicative of the performance of the shock absorber are its operating diagrams. They are obtained on hydraulic and electrodynamic stands equipped with the necessary transducers of force, displacement and velocity [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study of vibrational behaviour of shock absorber in harshness frequency range 20-100 Hz

Georgiev

2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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The main task of the shock absorber is to provide good comfort to the vehicle by damping the relative movement between the wheel axle and the body. The damping force in the shock absorber is created by the viscous resistance of the working oil as it passes through the valve systems between the various chambers. At low frequencies (below 1 Hz) and large relative displacements of the shock absorber (over 5 mm), the hysteresis of the gas filled in the shock absorber has a slight damping effect also. The fluid and gas forces are the main components of the total force that acts in the damper during its compression and extension in the frequency range up to 20 Hz. These forces counteract the disturbing forces of road unevenness and reduce the level of vibrations that are transmitted to the body at the mounting points. Road disturbances with a frequency above 20 Hz are characterized by small displacements (amplitudes). Small displacements of the piston rod (less than 1 mm) do not provide the necessary pressure in the chambers to overcome the resistance of the valve springs and actuate the fluid damping. In this frequency range, the compressibility of the working fluid also affects the force in the shock absorber. The work examines the vibrational behaviour of a telescopic shock absorber in the frequency range 20-100 Hz – known as the harshness range in NVH (Noise, Vibration and Harshness) studies. For this purpose, a hydrodynamic test bench is used, which is equipped with a force sensor. The pressures in each chamber of the shock absorber are measured. The pressure in the extension chamber is the indicator of the damping force. The results show that the fluid damping of the shock absorber decreases with the increase of the disturbance frequency. Above 50 Hz, the vibrations passing through the shock absorber are damped only by its rubber mounts. The force transmitted through the shock absorber increases and it is linearly proportional to vibration accelerations.

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Influence of shock absorber temperature on vehicle ride comfort and road holding

Cited by 15 publications

References 8 publications

The influence of temperature on the damping characteristic of hydraulic shock absorbers

The influence of temperature on the damping characteristic of hydraulic shock absorbers

Study of the vibrational behaviour of the components of a car suspension

Study of vibrational behaviour of shock absorber in harshness frequency range 20-100 Hz

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