Elastohydrodynamic lubrication simulation of O-ring and U-cup hydraulic seals

Yang, Bo; Salant, Richard F.

doi:10.1177/1350650110397236

Cited by 45 publications

(37 citation statements)

References 18 publications

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“…In this case, the width of the sealing contact is x 2 -x 1 0.30 mm. The pressure distributions in Figure 7 are partly reminiscent of those found in the case of U-cup and step seals near their working tip [20,21]. Accordingly, the normal strain of the seal, ε z , is shown in Figure 8 and it is obvious that it appears as the total pressure distribution vertically flipped.…”

Section: Resultsmentioning

confidence: 66%

“…In most published theoretical studies dealing with the performance of polymeric sliding seals [3], the problem solved involves calculating the film thickness distribution in a sealing contact and from that point on, calculating the leakage rate and the frictional force or the coefficient of friction; some of the most representative numerical studies in this respect are references [7,8,[10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Abrasive wear modeling of seals is not included, except in a handful of studies, given the uncertainty surrounding a wear coefficient such as that included in the well-known Archard wear equation [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Profile Optimization of Hydraulic, Polymeric, Sliding Seals by Minimizing an Objective Function of Leakage, Friction and Abrasive Wear

Nikas¹

2020

Lubricants

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Hydraulic dynamic seals for reciprocating or alternating motion are machine elements with widespread applications in the automotive, aerospace, marine, pharmaceutical and several other industrial sectors. They have been under commercial development for many decades, and are often met in critical positions, consuming a considerable amount of energy during operation. An objective function of mass leakage rate, friction force and an abrasive-wear representative term is proposed in the present study to evaluate the performance of hydraulic, polymeric sliding seals under suitable constraints. Using Variational Calculus, analytical and numerical techniques, the objective function is minimized, resulting in an optimal seal profile that maximizes sealing performance for given, steady-state operating conditions, in additional consideration of the structural integrity and manufacturability of the modified seal. The obtained seal shape and related pressure distribution are reminiscent of those for U-cup and step seals, designs that dominate the industry. In the course of the mathematical analysis, some major obstacles are documented that show how sensitive and complicated sealing performance really is.

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Section: Resultsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Profile Optimization of Hydraulic, Polymeric, Sliding Seals by Minimizing an Objective Function of Leakage, Friction and Abrasive Wear

Nikas¹

2020

Lubricants

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“…After sampling, the sampling tube is lifted up, and the ball valve is rotated by 90° under the action of the driving mechanism or external force, and the lower end of the pressure-retaining cylinder is sealed. Steel-on-steel seals are usually used in combination with O-shaped seal rings; this approach thus concerns a traditional way of sealing [40][41][42]. Ball valves have good wear resistance.…”

Section: Sealing Technologymentioning

confidence: 99%

Review and Analysis of Key Techniques in Marine Sediment Sampling

Peng

Jin

et al. 2020

Chin. J. Mech. Eng.

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Deep-sea sediment is extremely important in marine scientific research, such as that concerning marine geology and microbial communities. The research findings are closely related to the in-situ information of the sediment. One prerequisite for investigations of deep-sea sediment is providing sampling techniques capable of preventing distortion during recovery. As the fruit of such sampling techniques, samplers designed for obtaining sediment have become indispensable equipment, owing to their low cost, light weight, compactness, easy operation, and high adaptability to sea conditions. This paper introduces the research and application of typical deep-sea sediment samplers. Then, a representative sampler recently developed in China is analyzed. On this basis, a review and analysis is conducted regarding the key techniques of various deep-sea sediment samplers, including sealing, pressure and temperature retaining, low-disturbance sampling, and no-pressure drop transfer. Then, the shortcomings in the key techniques for deep-sea sediment sampling are identified. Finally, prospects for the future development of key techniques for deep-sea sediment sampling are proposed, from the perspectives of structural diversification, functional integration, intelligent operation, and high-fidelity samples. This paper summarizes the existing samplers in the context of the key techniques mentioned above, and can provide reference for the optimized design of samplers and development of key sampling techniques.

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“…Salant et al developed the EHL method and established a numerical model of piston reciprocating seal. They considered the effect of roughness of the seal lip and obtained the leakage, friction, and thickness distribution of a U‐cup and an O‐ring.…”

Section: Introductionmentioning

confidence: 99%

A study of reciprocating seals with a new mixed‐lubrication model based on inverse lubrication theory

Suo

Guo

et al. 2017

Lubrication Science

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A mixed‐lubrication numerical model for hydraulic seals by the inverse‐hydrodynamic‐lubrication method is presented in this paper for the first time. The hydrodynamic effect on the seal inlet is taken into account as well as the asperity contact pressures. The coupling relationship between the fluid pressure, asperity contact pressure, and static contact pressure is provided by finite‐element analysis. The reverse pumping rate and friction force are calculated from the model under different fluid‐pressure and rod‐velocity conditions. All calculation results agree well with the experimental results, which are measured by the bench test as developed by the authors. By this new model, the average relative error between calculation results and experimental results is 10.5% under all test conditions, compared with 62.6% of the results by full‐film lubrication model.

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Elastohydrodynamic lubrication simulation of O-ring and U-cup hydraulic seals

Cited by 45 publications

References 18 publications

Profile Optimization of Hydraulic, Polymeric, Sliding Seals by Minimizing an Objective Function of Leakage, Friction and Abrasive Wear

Profile Optimization of Hydraulic, Polymeric, Sliding Seals by Minimizing an Objective Function of Leakage, Friction and Abrasive Wear

Review and Analysis of Key Techniques in Marine Sediment Sampling

A study of reciprocating seals with a new mixed‐lubrication model based on inverse lubrication theory

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