| Dynamic seal in hydraulic applications undergo extreme pressures, loads andtemperatures during operation. Any failure of these seal components would damage the hydraulic system heavily and lead to excessive leakage of fluid to the environment. Therefore, the correct engineering design and evaluation of hydraulicseals is of paramount importance to avoid costly mistakes.The research on sealmechanism and performances of dynamic seal for hydraulic actuators is more complex and changeable than general static seal because of moving components. Theoretical analysis of dynamic seals for hydraulic actuators includes both the mechanics and the lubrication modeling of hydraulic seals. In addition, the researchon the elastohydrodynamics and contact mechanics problems of flexible seals ischallenging.The article, therefore, aims to clarify the mechanism of dynamic seal for hydraulicactuators, utilize the methods of numerical analysis and fluid-structure interaction tosimulate the mechanism to study the effects of many parameters on the performance ofdynamic seal. Firstly, this article takes the electro-hydraulic swing motor for an exampleand introduces the structure and the material of the dynamic seals and establishes themodel of contact pressure in sealing zone in different temperatures. Secondly,elastohydrodynamic lubrication theory is established to evaluate the characteristic of thedynamic seal when calculating the thickness of fluid film, leakage and friction indifferent parameters. Finally, the interaction of the structure and fluid is taken intoaccount. The fluid-structure interaction simulation is carried out to analyze thedeformation of the seal components under the flow of fluid and the change in values offluid film, leakage as well as friction in comparison with elastohydrodynamiclubrication theory. |
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