Optimal Design of the Sealing Structure of a Hydraulic Cylinder on the Basis of a Surrogate Model

Zhang, Hong; Sun, Yuwen; Li, Chenchen; Wang, Haoran

doi:10.1155/2020/1753964

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Subsequently, the sealing performance of rubber O-rings under the action of high-pressure hydrogen was discussed, including static sealing characteristics and dynamic sealing characteristics. Hong Zhang and Zhen Li [17,18] established a structural simulation model to analyze the influence of different structural parameters on the sealing performance of O-rings to achieve the best sealing effect of the structure.…”

Section: Introductionmentioning

confidence: 99%

Research on the Sealing Mechanism of Split-Liner High-Pressure Hydrogen Storage Cylinders

Tong,

Zhu,

Liu

et al. 2024

Processes

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Hydrogen storage is a crucial factor that limits the development of hydrogen energy. This paper proposes using a split liner for the inner structure of a hydrogen storage cylinder. A self-tightening seal is employed to address the sealing problem between the head and the barrel. The feasibility of this structure is demonstrated through hydraulic pressure experiments. The influence laws of the O-ring compression rate, the distance from the straight edge section of the head to the sealing groove, and the thickness of the head on the sealing performance of gas cylinders in this sealing structure are revealed using finite elements analysis. The results show that when the gas cylinder is subjected to medium internal pressure, the maximum contact stress on the O-ring extrusion deformation sealing surface is greater than the medium pressure. There is sufficient contact width, that is, the arc length of the part where the stress on the O-ring contact surface is greater than the medium pressure, so that it can form a good sealing condition. At the same time, increasing the compression ratio of the O-ring and the head’s thickness will help improve the sealing performance, and reducing the distance from the straight edge section of the head to the sealing groove will also improve the sealing performance.

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Section: Introductionmentioning

confidence: 99%

Research on the Sealing Mechanism of Split-Liner High-Pressure Hydrogen Storage Cylinders

Tong,

Zhu,

Liu

et al. 2024

Processes

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show abstract

“…Wei et al (2020) investigated the sealing characteristics of aircraft Glacis rings under 21 MPa operating conditions, and the results showed that the friction force gradually increased with the increase of fluid pressure; the friction force increased significantly with the increase of temperature. Yan et al (2020) considered the amplitude and wavelength of surface roughness and analyzed the effects of ACGT-type seal motion velocity and hydraulic oil viscosity variation on the lubrication performance and sealing performance of the seal. Zhang et al (2021) and Zhang and Li (2021) conducted numerical analysis and finite element simulation research on the main seal of aviation actuators, established a mixed lubrication model for reciprocating seals, calculated the friction force and reverse pump return rate of the reciprocating seal system and provided a reference basis for the structural optimization of reciprocating seals.…”

Section: Introductionmentioning

confidence: 99%

Thermo-elastohydrodynamic lubrication performance study of step seal under transient condition

Wei,

Sun,

Tian

et al. 2023

ILT

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Purpose This paper aims to study the impact of transient velocity changes on sealing performance during reciprocating sealing processes. Design/methodology/approach Establish a model of transient mixed lubrication, solve the transient Reynolds equation, consider the effect of temperature rise at the seal interfaces, and determine the behavior of the seal interfaces, such as film thickness and fluid pressure. Evaluation with friction and leakage rate, calculate the variation of sealing performance with reciprocating velocity under different working conditions, and verify it through bench experiments. Findings Within a reciprocating stroke, the frictional force decreases with increasing velocity, and the frictional force of the outstroke is greater than that of the instroke; at the time of the stroke transition, the fluid pressure is smallest and the rough peak contact pressure is greatest. At present, the dynamic pressure effect of fluids is the largest, and the friction force also increases, which increases the risk of material wear and failure. Friction and leakage increase with increasing pressure and root mean square roughness. As temperature increases, friction increases and leakage decreases. In studying the performance variations of seal components through a reciprocating sealing experiment, it was found that the friction force decreases with increasing velocity, which is consistent with the calculated results and more similar to the calculated results considering the temperature rise. Originality/value This study provides a reference for the study of transient sealing performance.

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Design of a Segmented Mirror with a Global Radius of Curvature Actuation System: Contributions of Multiple Surrogates

Dong

et al. 2020

Applied Sciences

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Due to fabrication difficulties, separately-polished segmented mirrors cannot meet the co-phasing surface shape error requirements in the segmented telescope system. Applying the global radius of curvature (GRoC) actuation system for the individual segments has become an effective solution in space-based telescopes. In this paper, we designed a segmented mirror with a GRoC actuation system. The direct optimization by numerical simulations has low computational efficiency and is not easy to converge for optimizing the actuation point’s position on the segmented mirror. For this problem, three common surrogates, including polynomial response surface (PRS), radial basis function neural network (RBFNN), and kriging (KRG), were summed to propose the multiple surrogates (MS) which have the higher approximate ability. The surrogates were then optimized through the multi-island genetic algorithm (MIGA), and the segmented mirror met the design requirement. Compared with direct optimization through numerical simulations, the results show that the proposed multiple-surrogate-based optimization (MSBO) methodology saves computational cost significantly. Besides, it can be deployed to solve other complex optimization problems.

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Optimal Design of the Sealing Structure of a Hydraulic Cylinder on the Basis of a Surrogate Model

Cited by 3 publications

References 24 publications

Research on the Sealing Mechanism of Split-Liner High-Pressure Hydrogen Storage Cylinders

Research on the Sealing Mechanism of Split-Liner High-Pressure Hydrogen Storage Cylinders

Thermo-elastohydrodynamic lubrication performance study of step seal under transient condition

Design of a Segmented Mirror with a Global Radius of Curvature Actuation System: Contributions of Multiple Surrogates

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