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

Hryciów, Z.; Rybak, Piotr; Gieleta, Roman

doi:10.17531/ein.2021.2.14

Cited by 10 publications

(9 citation statements)

References 14 publications

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“…In a HP strut, as in hydraulic shock absorbers, the vibration energy is dissipated as heat [19]. At high vibration amplitudes and poor heat transfer, this leads to heating of the hydraulic oil and changes in its damping properties [6,8]. In addition, the volume of oil and gas also increases and so does the deflection of the HP strut.…”

Section: Eksploatacja I Niezawodnosc -Maintenance and Reliabilitymentioning

confidence: 99%

Hydropneumatic suspension testing of a wheeled armoured personnel carrier

Hryciów¹,

Rybak²,

Wojciechowski³

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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The purpose of this study was to determine the effect of gas pressure and temperature on the spring characteristic of a HP strut used in a wheeled armoured personnel carrier. The research was performed based on a simulation model. Data to validate the model were obtained during experimental tests. The results indicate, among other things, that the friction generated in the seals is an important source of resistance force. Comparison of the simulation results with the measured characteristics indicates a proper modelling of the strut operation. Simulation studies have indicated that it is easy to modify the required suspension parameters by adjusting the initial gas pressure. A linear effect of pressure on static deflection can be assumed. Temperature has a strong influence on the spring characteristic. When it changes, significant changes in vehicle height are observed due to the lack of a compensation system. The temperature changes are not only due to changes in ambient temperature, but also by intense heating of the HP struts caused by the vehicle moving over rough terrain.

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Section: Eksploatacja I Niezawodnosc -Maintenance and Reliabilitymentioning

confidence: 99%

Hydropneumatic suspension testing of a wheeled armoured personnel carrier

Hryciów¹,

Rybak²,

Wojciechowski³

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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show abstract

“…During the passive suspension process, energy dissipates into the damper oil. The damper will continue to absorb and dissipate heat, which causes its temperature to rise [1][2][3]. The reduction in the damper performance can be attributed to the gradual dissipation of heat in the damper oil.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Cu Nanoparticles Loading and Temperature Effects on the Thermophysical Properties of SAE10W oil: Developing a New Mathematical Correlation

Manikandan,

Nanthakumar

2024

Period. Polytech. Chem. Eng.

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Nanofluids can enhance the thermophysical properties of base fluids to increase the efficiency of thermal systems. This study is to develop a new mathematical correlation to predict the thermophysical properties of the copper/damper oil (SAE10W oil) nanofluids. Also, experiments were conducted with varying concentrations of Cu nanoparticles and different temperatures. High-Resolution Scanning Electron Microscopy (HRSEM), Energy-Dispersive X-ray spectroscopy (EDX), and X-Ray Diffractometry (XRD) are done to characterize the Cu nanoparticles. After determining the structure of Cu nanoparticles, the Cu/damper oil nanofluid is prepared through a two-step method. The density and viscosity of the nanofluids are measured according to IS 1448-32 (1992) and ASTM D445-15 standards. The specific heat of nanofluids and thermal conductivity were measured using a thermal constant analyzer. The results demonstrate that Cu nanoparticles significantly improve the thermophysical properties of pure automotive damper oil, enhancing its thermal conductivity from 15.48% to 33.28%. Furthermore, the viscosity of automotive damper oil increases by 79% and 222% with 0.050% and 0.150% volume concentrations, respectively. The density and specific heat changes are also measured and reported. Based on the experimental findings, an empirical correlation is developed through a fitting method to predict the thermophysical properties of these nanofluids. This mathematical correlation accurately calculates the properties of Cu/damper oil nanofluid, with a margin of deviation ranging from −3.7% to 7%.

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“…Many researchers from different countries have carried out research into the characteristics of hydraulic shock absorbers. Some of them [4], for example, have studied the effect of low temperatures and others [5][6][7][8][9][10][11][12][13][14][15][16][17][18], in turn, of high temperatures on their damping characteristics. The effect of low temperatures and technical conditions on the characteristics of a hydraulic damper was studied by Z. Hryciow [19].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of low temperatures and technical conditions on the characteristics of a hydraulic damper was studied by Z. Hryciow [19]. Z. Hryciow and others [4] showed that the temperature of a hydraulic shock absorber has a significant effect on the values of the determined damping coefficients. This influence increases as the temperature of the tested shock absorber decreases.…”

Section: Introductionmentioning

confidence: 99%

Influence of Changes in Stiffness and Damping of Tyre Wheels on the Outcome of the Condition Assessment of Motor Vehicle Shock Absorbers

Zuska

Jackowski

2023

Energies

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This article deals with the influence of the elastic-damping properties (energy losses) of tired wheels on the results of the evaluation of the technical condition (dynamic properties) of automotive suspensions carried out on the diagnostic line. The purpose of this paper is to point out the inadequacies of test stands for assessing the technical condition of vehicle suspensions. The diagnostic line used in the testing featured two testing stations. The test object was a passenger car with hydro-pneumatic suspension. This enabled the conducting of suspension tests for two settings (comfort and dynamic positions). The tests were conducted for four different air pressures in the tyres of tired wheels. This made it possible to determine, for each wheel, four graphs of the load versus tyre deflection (radial stiffness characteristics). These graphs were used to determine the values of the stiffness coefficients, energy loss, and damping characteristics as well as to identify the correlation between the directional coefficient of the regression line of the elastic and damping characteristics of the tyres and the indices characterising the damping properties of the suspension of the test car. This paper shows that the result of the shock absorber condition assessment is significantly influenced by the elastic and damping properties of the tired wheels, caused by changes in tyre pressure.

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

Cited by 10 publications

References 14 publications

Hydropneumatic suspension testing of a wheeled armoured personnel carrier

Hydropneumatic suspension testing of a wheeled armoured personnel carrier

Experimental Study of Cu Nanoparticles Loading and Temperature Effects on the Thermophysical Properties of SAE10W oil: Developing a New Mathematical Correlation

Influence of Changes in Stiffness and Damping of Tyre Wheels on the Outcome of the Condition Assessment of Motor Vehicle Shock Absorbers

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