An Investigation of the Influence of Temperature and Technical Condition on the Hydraulic Shock Absorber Characteristics

Hryciów, Z.

doi:10.3390/app122412765

Cited by 6 publications

(4 citation statements)

References 16 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

“…The reciprocating motion of the piston causes the oil to pass through the flow hole or throttling gap of the piston and bottom valve system to generate the damping force [19][20][21][22][23]. During the operation of the shock absorber, the suction valve 4 and the intake valve 9 can be opened only with a small oil pressure, while the rebound valve 2 and the compression valve 5 can be opened when the fluid reaches a certain pressure [24][25]. The opening of the rebound valve 2 and the compression valve 5 is directly related to the vibration velocity of the piston and determines the damping force of the shock absorber [2,[26][27].…”

Section: Damping Characteristics Of the Shock Absorbermentioning

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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“…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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An Investigation of the Influence of Temperature and Technical Condition on the Hydraulic Shock Absorber Characteristics

Cited by 6 publications

References 16 publications

Hydropneumatic suspension testing of a wheeled armoured personnel carrier

Hydropneumatic suspension testing of a wheeled armoured personnel carrier

Research on deformation of valve slice of automobile shock absorber

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

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