Analysis on sealing performance of VL seals based on mixed lubrication theory

Xu, Shixian; Zheng-tao, SU; Wu, Jian

doi:10.1108/ilt-01-2018-0016

Cited by 11 publications

(8 citation statements)

References 14 publications

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“…LAT is used by Siddiqui et al [23] for finding the effect of magnetohydrodynamics on Newtonian calendaring. Most recently Xu et al [24] used LAT to analyze the sealing performance of VL seals.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of micropolar fluid in blade coating using lubrication theory

et al. 2020

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The blade coating process of a micropolar fluid using the plane and exponential coater has been studied. Equations are simplified utilizing lubrication approximation theory. The analytical expressions for flow rate, pressure gradient, and velocity are obtained, while load and coating thickness are computed numerically with the help of the shooting method. We show how the microrotation parameters and the coupling number N influence the flow characteristics, such as pressure distribution, velocity, pressure gradient and related engineering quantities such as load and thickness in the blade coating process, and they are shown graphically as well as in tabular form. We find that, for coupling number N and microrotation parameter , the pressure increases when compared to the Newtonian fluid. Moreover, the coating thickness decreases for the Newtonian case when N increases.

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Section: Introductionmentioning

confidence: 99%

Mathematical modeling of micropolar fluid in blade coating using lubrication theory

et al. 2020

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“…By putting Equation (19) into (23), it is shown that one must choose the value of k , k and k which will converge the sliding surface value to the zero. When the sliding surface value approaches zero then it will show the sliding surface phase rather than reaching phase.…”

Section: Sliding Mode Controlmentioning

confidence: 99%

“…The performance of the opposed pad hydrostatic bearing is improved by using a membrane-type hydrostatic restrictor [17]. The H loop and inner loop methods are used for stabilizing the shaft and reducing vibrations [18,19]. Integration of tribo-mechatronics and control has divided the active hydrostatic bearings into three classes.…”

Section: Introductionmentioning

confidence: 99%

Model-Based Design Approach to Improve Performance Characteristics of Hydrostatic Bearing Using Multivariable Optimization

et al. 2021

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Research in the field of tribo-mechatronics has been gaining popularity in recent decades. The objective of the current research is to improve static/dynamics characteristics of hydrostatic bearings. Hydrostatic bearings always work in harsh environmental conditions that effect their performance, and which may even result in their failure. The current research proposes a mathematical model-based system for hydrostatic bearings that helps to improve its static/dynamic characteristics under varying conditions of performance-influencing variables such as temperature, spindle speed, external load, and clearance gap. To achieve these objectives, the capillary restrictors are replaced with servo valves, and a mathematical model is developed along with robust control design systems. The control system consists of feedforward and feedback control techniques that have not been applied before for hydrostatic bearings in the published literature. The feedforward control tries to remove a disturbance before it enters the system while feedback control achieves the objective of disturbance rejection and improves steady-state characteristics. The feedforward control is a trajectory-based controller and the feedback controller is a sliding mode controller with a PID sliding surface. The particle swarm optimization algorithm is used to tune the 6-dimensional vector of the tuning parameters with multi-objective performance criteria. Numerical investigations have been carried out to check the performance of the proposed system under varying conditions of viscosity, clearance gap, external load and the spindle speed. The comparison of our results with the published literature shows the effectiveness of the proposed system.

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“…The solid contact mechanism between two surfaces that are sliding relative to each other is quite complex and is not yet sufficiently known. 28 As the Greenwood-Williamson model is widely used in current studies of reciprocating seals, 7,[9][10][11][13][14][15][16][17][18][19][20] this contact model is also employed in this paper. A Gaussian distribution is assumed to exist for these asperities, and the solid contact pressure can be calculated by the Greenwood-Williamson contact model 29 :…”

Section: Contact Mechanismmentioning

confidence: 99%

“…The coupling method has been widely employed in the study of single seals such as O-rings, [4][5][6][7][8][9] U-cup seals [10][11][12][13][14] and some combined seals such as Step seals 15,16 and VL seals. [17][18][19][20] However, the above studies focused mainly on the sealing performance under normal temperature conditions, while little research has been conducted on the sealing performance in a wide temperature range. Nikas et al 21 have carried out pioneering and detailed experimental work on the rectangular ring 20 and proposed a fast calculation method for reciprocating seals at temperatures of −54°C, 23°C and 135°C, respectively.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the tribological performance of reciprocating seals in a wide temperature range

Peng

Ouyang

Schmitz

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Reciprocating seals are widely used in general industrial machines and are designed to endure rigorous working conditions. Among the harshest challenges, the wide temperature range they withstand has a significant influence on their sealing performance. However, most studies of reciprocating seals have focused only on their sealing characteristics at normal temperatures. To investigate the impacts of temperature on the seal's tribological performance, this paper examines the VL seal, a kind of combined seals, and discusses its performance in a wide temperature range. Material properties of the VL seal at temperatures from −55 °C to 135 °C are measured based on the seal product. The thermo-viscosity effect and the influence of thermal expansion and contraction are both considered in the reciprocating seal modelling. A coupling method that combines the finite-element analysis model with a mixed-lubrication procedure is implemented. For deformation calculation, a comparison between the influence coefficient method and the semi-infinite space method is conducted, and finds only minuscule disparities for the VL-seal analysis. To avoid the divergent problem due to high viscosity at low temperatures, this paper proposes the successive approaching method. Details of the sealing zone in the outstroke and instroke are systematically discussed in relation to a wide range of temperatures. The corresponding experiments are conducted and compared with the simulation. The results indicate that the temperature has a tremendous influence on the tribological performance. The leakage and the friction at the high temperature are much higher than those at the normal temperature.

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Analysis on sealing performance of VL seals based on mixed lubrication theory

Cited by 11 publications

References 14 publications

Mathematical modeling of micropolar fluid in blade coating using lubrication theory

Mathematical modeling of micropolar fluid in blade coating using lubrication theory

Model-Based Design Approach to Improve Performance Characteristics of Hydrostatic Bearing Using Multivariable Optimization

Investigation of the tribological performance of reciprocating seals in a wide temperature range

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