Variable load failure mechanism for high-speed load sensing electro-hydrostatic actuator pump of aircraft

Shi, Chao; Wang, Shaoping; Wang, Xingjian; Zhang, Yixin

doi:10.1016/j.cja.2018.01.005

Cited by 26 publications

(15 citation statements)

References 24 publications

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“…An accurate prediction of the transient displacement chamber pressure involves the leakages of all lubricating interfaces simultaneously, which requires a separate calculation module. 35 Note that the Reynolds equation in equation 28has a different right side compared with the popularly used Reynolds equation, [16][17][18]20,21,[24][25][26]29,32 which is typically given by 1 r @ @r…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…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%

See 2 more Smart Citations

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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 EHA has been equipped on fighters and civil aviation aircrafts (Anton and Yuan, 2016; Kirchmann et al, 2016; Li et al, 2018). Many researchers have done a lot of studies on the EHA (Ahn et al, 2013; Habibi and Goldenberg, 2000; Kaminaga et al, 2010; Kreitz et al, 2014; Shi et al, 2018; Zhang et al, 2018). If the EHA is used in the exoskeleton, the efficiency of hydraulic energy will be significantly improved.…”

Section: Introductionmentioning

confidence: 99%

A novel pump-valve coordinated controlled hydraulic system for the lower extremity exoskeleton

Jinlin

Wang

Cao

et al. 2020

Transactions of the Institute of Measurement and Control

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In order to reduce the weight and improve the energy efficiency of the lower extremity exoskeleton, a novel pump-valve coordinated controlled (PVCC) hydraulic system is presented. This hydraulic system only uses one electro-hydrostatic unit (EHU) and two valves to drive two hydraulic cylinders at the hip and knee of the lower extremity exoskeleton. The PVCC hydraulic system has the advantage of high energy conversion efficiency of the electro-hydrostatic actuator (EHA), which consists of one EHU and one hydraulic cylinder. To meet the requirements of the moment and speed of each joint of the exoskeleton, the proportional valve and on-off valve are added to adjust the flow into two hydraulic cylinders. The performance of EHU is tested by some hydraulic experiments, and the performance of the PVCC hydraulic system is analyzed by AMESim. The results show that the novel hydraulic system can only use one EHU to drive two hydraulic cylinders simultaneously under the premise of meeting the functional requirements of the exoskeleton.

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“…And when the fluid film thickness is reduced between Slipper and swashplate, there is a greater chance that metal-metal contact occurs. Due to the tilting moment, the fluid film height distribution resulting from a rigid body separation of the slipper from the swashplate in the local slipper cylindrical coordinate system can be described using the height of the three control points at the outer diameter of the slipper [1], [13], [23], [24]. The deformation occurring on the Slipper/swashplate interface is due to the exchange and increase of heat between the solid-fluid structure and caused by the thermodynamic pressure under the Slipper.…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Deformation Phenomenon on the Process of Lubricating and Improving the Efficiency Between the Slipper and Swashplate in Axial Piston Machines

et al. 2019

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The process of lubricating a sliding interface between the Slipper and the swashplate in axial piston machines is a major solution for the improvement of its efficiency and performance. This lubrication process is largely influenced by the phenomenon of the thermoelastic and hydrodynamic deformation of the solid-liquid structure on this interface. This paper is mainly based on the study of the causes and processes of deformation, as well as the conditions of improvement of this deformation by the lubrication on the interface slipper/swashplate. For this, a mathematical model detailing the model deformation elastic and hydrodynamic on the slide interface Slipper/swashplate is made. The major parameters in the deformation such as the loads and the oil size are simulated. The energy equation is solved to understand the effect of the temperature on the oil behavior. The Reynold equation is solved to simulate the hydrodynamic pressure between the Slipper and the swashplate. A test rig is specially built to measure the torques and loads, the pressure, the oil height, and the temperature between the Slipper and the swashplate for different input conditions. The comparison between the simulation results and the experimental ones proves the coherence and the precision of the results of this research. Finally, some propositions to improve the performance of the axial piston machines for the lubrication mechanism on the Slipper/swashplate interface are given.

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Variable load failure mechanism for high-speed load sensing electro-hydrostatic actuator pump of aircraft

Cited by 26 publications

References 24 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

A novel pump-valve coordinated controlled hydraulic system for the lower extremity exoskeleton

The Impact of the Deformation Phenomenon on the Process of Lubricating and Improving the Efficiency Between the Slipper and Swashplate in Axial Piston Machines

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