Visualization Experiment of Single Particle Motion in Model of Spool Valve Clearance

Yuan, Haili; Hong, Jung-Pyo; Zhang, Jianjun; Liu, Xinqiang; Chen, Qianpeng; Zheng, Zhi; Peng, Guoyi

doi:10.1109/fpm45753.2019.9035725

Cited by 3 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FAN [7] designed a device for measuring the frictional force of contaminated hydraulic oil on the sliding valve core, analyzing the effects of pollutant particle content and particle size on the frictional force of valve core movement through experiments. Ji [16] and Yuan [17] discovered the rotational motion of particles in sliding valve clearance through numerical calculations and analyzed the movement of individual particles in the clearance and pressure equalization groove using model-based visual experiments. Chen [18] modeled and analyzed the thermal deformation of the slide valve using COMSOL Multiphysics field coupling software.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Micrometer-Sensitive Particle Intrusion in Hydraulic Valve Clearances and Its Impact on Valve Performance

Zhang,

Ji,

Zhao

et al. 2024

Processes

Self Cite

View full text Add to dashboard Cite

The intrusion of micrometer-sensitive contaminant particles into the clearance of sliding valves within hydraulic fluids is one of the root causes of valve sticking and reliability issues in hydraulic systems. To reveal the transient process and characteristics of particle intrusion into the clearance process, this paper proposes a numerical method for fluid–particle one-way coupling and verifies it through experimentation. Furthermore, a numerical simulation of the motion trajectory of spherical iron particles inside the valve chamber was conducted in a two-dimensional flow model. It was discovered that in a steady-state flow field with a certain valve opening, micrometer-sized particles in the valve chamber’s hydraulic fluid mainly move with the valve flow stream, and the number of micron particles invading the slide valve clearance and the probability of invasion is related to the slide valve opening and differential pressure. When the slide valve opening decreases, especially in the small opening state, the probability of particles invading the slide valve clearance will increase dramatically, and the probability of invading the clearance is as high as 27% in a valve opening of 50 μm; the larger the pressure difference between the valve ports, the more the number of particles invading the slide valve clearance increases; the particles in the inlet of the slide valve clearance are more prone to invade the slide valve clearance, and invade in an inclined way, touching the wall and then bouncing back. These findings are of great value for the design of highly reliable hydraulic control valves and the understanding of the mechanism of slide valve stalls and provide an important scientific basis for the optimization and improvement in the reliability of hydraulic systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Micrometer-Sensitive Particle Intrusion in Hydraulic Valve Clearances and Its Impact on Valve Performance

Zhang,

Ji,

Zhao

et al. 2024

Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…A typical example is the spool valve, which is a key components of power transmission in hydraulic systems. Figure 1 gives a diagram of spool valve structure, which is reproduced from Ref 12 . There are two failure modes of the spool valve including wear between the spool and the sleeve 13,14 (which can be modeled by a degradation process) and clamping stagnation 15,16 (that can be modeled by a hard failure process from random shocks).…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 gives a diagram of spool valve structure, which is reproduced from Ref. 12 There are two failure modes of the spool valve including wear between the spool and the sleeve 13,14 (which can be modeled by a degradation process) and clamping stagnation 15,16 (that can be modeled by a hard failure process from random shocks). For a working spool valve, contaminated particles mixed in the flowing oil may probable accumulate in the clearance, and the wear rate of the spool valve significantly increases when the cumulative contaminated particles reach a certain size level.…”

Section: Introductionmentioning

confidence: 99%

Reliability modeling for competing failure processes considering degradation rate variation under cumulative shock

Wang

Cao

Li³

et al. 2022

Quality & Reliability Eng

View full text Add to dashboard Cite

Most systems experience both random shocks (hard failure) and performance degradation (soft failure) during service span, and the dependence of the two competing failure processes has become a key issue. In this study, a novel dependent competing failure processes (DCFPs) model with a varying degradation rate is proposed. The comprehensive impact of random shocks, especially the effect of cumulative shock, is reasonably considered. Specifically, a shock will cause an abrupt degradation damage, and when the cumulative shock reaches a predefined threshold, the degradation rate will change. An analytical reliability solution is derived under the concept of first hitting time (FHT). Besides, a one-step maximum likelihood estimation method is established by constructing a comprehensive likelihood function. Finally, the reasonability of the closed form reliability solution and the feasibility and effectiveness of the proposed DCFPs modeling methodology are demonstrated by a comparative simulation study.

show abstract

“…The size of a clearance should be set with regard to the following: the clearance should be small enough to prevent internal leakage, yet big enough to provide the sufficient space needed to ensure smooth action [6,7]. Barriers to achieving ideal clearance include factors such as roughness variation [8][9][10][11], particle pollution [12][13][14][15][16][17] and thermal deformation of valve orifices. Thermal deformation occurs when viscous heating generated by fluids increases the temperature of the valve orifice.…”

Section: Introductionmentioning

confidence: 99%

Optimization Algorithm and Joint Simulation to Micro Thermal Deformation Using Temperature Measurement in the Orifice of Hydraulic Valve

et al. 2020

Self Cite

View full text Add to dashboard Cite

When exposed to viscous heating, hydraulic valve orifices experience thermal deformation, which causes spool clamping and actuator disorder. Quantitative research on thermal deformation can help reveal the micro-mechanism of spool clamping. In this study, miniature thermocouples are embedded into a valve orifice with an opening size of 1 mm to measure temperature distribution. An optimization algorithm based on measurement data (M-OA) for the thermal deformation of the valve orifice is proposed. The temperature and thermal deformation of the valve orifice are calculated through Fluent and Workbench joint simulation, with the measurement data serving as boundary conditions. Results show that, for a valve orifice with a valve wall length of 18 mm, when the temperature of the sharp edge is at 60 °C, thermal deformation measures 7.7 μm via observation and 7.62803 μm via M-OA, indicating that the M-OA method is reliable. The results of the joint simulation can be accepted because measurements of temperature reached an accuracy rate of 95%, and that of deformation reached 82.7%. A large drop in pressure led to a rapid increase in temperature, causing serious thermal deformation of the valve orifice. With an inlet pressure of 3 MPa, the temperature of the sharp edge reached 72.9 °C within 110 min, and radial thermal deformation can reach 8.3 μm. Such deformation poses great risk of spool clamping for a spool valve of Φ36 mm.

show abstract

Visualization Experiment of Single Particle Motion in Model of Spool Valve Clearance

Cited by 3 publications

References 3 publications

Numerical Investigation of Micrometer-Sensitive Particle Intrusion in Hydraulic Valve Clearances and Its Impact on Valve Performance

Numerical Investigation of Micrometer-Sensitive Particle Intrusion in Hydraulic Valve Clearances and Its Impact on Valve Performance

Reliability modeling for competing failure processes considering degradation rate variation under cumulative shock

Optimization Algorithm and Joint Simulation to Micro Thermal Deformation Using Temperature Measurement in the Orifice of Hydraulic Valve

Contact Info

Product

Resources

About