Validation of a thermal elastohydrodynamic multibody dynamics model of the slipper pad by friction force measurement in the axial piston pump

Hashemi, S. M. R.; Friedrich, Hendrik; Bobach, Lars; Bartel, Dirk

doi:10.1016/j.triboint.2017.05.013

Cited by 40 publications

(28 citation statements)

References 10 publications

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“…Tang et al 25,26 developed a thermoelastohydrodynamic lubrication model to predict the fluid film thickness and temperature distributions within the slipper/swash plate interface under different operating conditions. Hashemi et al 27,28 examined the multibody dynamics of the slipper/swash plate interface based on the simultaneous numerical solution of motion equations, generalized Reynolds equation, and energy and Fourier heat equations. Shi et al 29 established a transient lubrication model for the slipper/swash plate interface of high-speed axial piston pumps to reveal the failure mechanism of slippers under variable load conditions.…”

Section: Introductionmentioning

confidence: 99%

Derivation of the Reynolds equation in cylindrical coordinates applicable to the slipper/swash plate interface in axial piston pumps

Chao

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Although many tribology references have presented the Reynolds equation in cylindrical coordinates, they may not be applicable to the slipper/swash plate interface in axial piston pumps due to complex macro and micro motions of slippers. Therefore, this paper derives the generalized Reynolds equation in cylindrical coordinates for this interface from momentum and continuity equations. Also, the boundary velocity conditions for the Reynolds equation are evaluated based on the kinematics of slippers, which accounts for the spinning motion. Compared with the traditional Reynolds equation for the slipper/swash plate interface, the new Reynolds equation in this work considers the geometric squeeze and centrifugal terms and has a different form of Couette terms.

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Section: Introductionmentioning

confidence: 99%

Derivation of the Reynolds equation in cylindrical coordinates applicable to the slipper/swash plate interface in axial piston pumps

Chao

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The friction and wear of the friction pairs for axial piston pumps were studied by Canbulut et al [4], whose results showed that the premature wear of this key friction pair was one of the main causes of the reduced service life of axial piston pumps, and the dry friction performance can be effectively improved by selecting suitably matched materials. To improve the wear resistance of slipper pairs for axial piston pumps, a thermal-structural coupling model of a friction pair, composed of slippers and a swashplate under lubrication conditions, was established by Hashemi et al [11], who analyzed the heat generation mechanism of the slipper pair. Their results indicate that the slipper boot temperature is mainly affected by the input heat flux and the heat conduction.…”

Section: Introductionmentioning

confidence: 99%

Study on friction performance and mechanism of slipper pair under different paired materials in high-pressure axial piston pump

Zhao

et al. 2019

Friction

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High-pressure axial piston pumps operate in high-speed and high-pressure environments. The contact state of the slipper against the swashplate can easily change from an oil film lubrication to a mixed oil film/asperity contact, or even dry friction. To improve the dry friction performance of slipper pairs and to avoid their potentially rapid failure, this study examined the effects of material matching on the dry friction performance of the slipper pair for high-pressure axial piston pumps. A FAIAX6 friction and wear tester was developed, and the dry friction coefficients of the slipper pairs matched with different materials were studied using this tester. Based on the thermo-mechanical coupling of the slipper pair with the working process, the contact surface temperatures of the slipper pairs matched with different materials were calculated and analyzed for the same working conditions. Following this, the effects of the material properties on the temperature increase at the slipper sliding contact surfaces were revealed. The reliabilities of the temperature calculations and analysis results were verified through orthogonal tests of slipper pairs matched with different materials. The results indicate that the influence of the material density on the friction coefficient is greater than that of the Poisson's ratio or the elastic modulus, and that the slipper material chosen should have a high thermal conductivity, low density, and low specific heat, whereas the swashplate material should be high in specific heat, density, and thermal conductivity; in addition, the slipper pair should be a type of hard material to match the type of soft material applied; that is, the hardness of the swashplate material should be greater than that of the slipper material.

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“…Hashemi et al [19] developed a multi-dynamics model for the slipper/swash plate interface which also includes a mixed-lubrication model, using the authors' software Tribo-x. The model was validated through the creation of a special test rig in which the friction between the slipper and swash plate was measured [20]. Similarly, thermo-elastohydrodynamic (TEHD) models have been developed that are able to predict the behavior of the fluid film for the interfaces between the following components: piston/cylinder (Pelosi [21], Mizell [22] and Shang [23]), cylinder block/valve plate (Zecchi [24]), and slipper/swash plate (Schenk [25]).…”

Section: Introductionmentioning

confidence: 99%

Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation

Chacon

Ivantysynova

2019

Energies

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This article presents a novel methodology to design swash plate type axial piston machines based on computationally based approach. The methodology focuses on the design of the main lubricating interfaces present in a swash plate type unit: the cylinder block/valve plate, the piston/cylinder, and the slipper/swash plate interface. These interfaces determine the behavior of the machine in term of energy efficiency and durability. The proposed method couples for the first time the numerical models developed at the authors' research center for each separated tribological interface in a single optimization framework. The paper details the optimization procedure, the geometry, and material considered for each part. A physical prototype was also built and tested from the optimal results found from the numerical model. Tests were performed at the authors' lab, confirming the validity of the proposed method.

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Validation of a thermal elastohydrodynamic multibody dynamics model of the slipper pad by friction force measurement in the axial piston pump

Cited by 40 publications

References 10 publications

Derivation of the Reynolds equation in cylindrical coordinates applicable to the slipper/swash plate interface in axial piston pumps

Derivation of the Reynolds equation in cylindrical coordinates applicable to the slipper/swash plate interface in axial piston pumps

Study on friction performance and mechanism of slipper pair under different paired materials in high-pressure axial piston pump

Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation

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