A numerical coupling model for a multibody system with multiple lubricated clearance joints

Zhao, Bo; Shen, Fei

doi:10.1051/matecconf/201710815006

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…Flores [ 14 ] was the pioneer in applying the Reynolds equation to the multibody system. To realize the complete coupling of a lubrication model and dynamics model of a multi-body mechanical system, Zhao et al [ 16 , 17 , 18 , 19 , 20 ] proposed fully coupling methods to model the internal combustion engine (ICE) with consideration of the lubrication joints. However, compared with the above-mentioned lubricated joints in the ICE, the lubrication inside the piston-cylinder interface in the swash-plate axial piston pump is more complex because its lubrication interface length is variable in most cases, and two primary relative motions between the piston and cylinder liner always exist: translation and rotation.…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Modeling Mixed Lubricated Piston-Cylinder Pairs of Variable Lengths in Swash-Plate Axial Piston Pumps

Zhao

Li³

et al. 2021

Materials

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The swash-plate axial piston pump is one of the most widely used pumps due to its simplicity and compactness in structure. In such a pump, the piston-cylinder system plays a crucial role, with its lubrication characteristics greatly affecting the overall pumping performance. A new numerical approach is proposed in this study for modeling mixed lubricated piston-cylinder interfaces of variable lengths in swash-plate axial piston pumps in the framework of multibody dynamics. The approach couples the hydrodynamic mixed lubrication model of the piston-cylinder interface with the multibody dynamics model of the piston pump. The lubrication model is established with a transient average Reynolds equation considering asperity contacts and is solved with the finite element method to derive the hydrodynamic forces of the lubricated pair, while the multibody dynamics model is established with Lagrangian formalism by considering hydrodynamic forces as external forces. Results for piston-cylinder interfaces of variable lengths in swash-plate axial piston pumps are presented, and the impacts of cylinder length and the tilt angle of the swash plate on the tribological performances of the interface are discussed. The results indicate that increasing the cylinder length can improve the stability and wear resistance of the piston, but it can exacerbate the frictional power loss. Moreover, although enlarging the tilt angle of the swash plate can effectively increase pump displacement, it can easily lead to serious friction, wear, and leakage problems. Consequently, the tilt angle of the swash plate should be carefully selected in practical applications.

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Section: Introductionmentioning

confidence: 99%

A New Approach for Modeling Mixed Lubricated Piston-Cylinder Pairs of Variable Lengths in Swash-Plate Axial Piston Pumps

Zhao

Li³

et al. 2021

Materials

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“…In combination with the development and improvement of material and fuel technologies, new and uncommon solutions find application [2][3][4]. The applications of unconventional solutions are often utilized in stationary machines like generators, cogeneration units etc.…”

Section: Introductionmentioning

confidence: 99%

Piston kinematics of a combustion engine with unconventional crank mechanism

et al. 2018

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The article deals with a theoretical solution of kinematic variables describing the movement of a combustion engine piston with unconventional mechanism FIK protected by patents No. 283742 and No. 283743 [1]. The course of the path, the velocity, and the acceleration were calculated to assess the dynamic properties of the unconventional mechanism, which transform the piston linear movement to rotational movement by using a swinging board, a baseboard and a crankshaft.

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The Tribo-Dynamics Performance of the Lubricated Piston Skirt–Cylinder System Considering the Cylinder Liner Vibration

Zhao

Wang

et al. 2022

Lubricants

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The tribo-dynamics performance of the piston–cylinder system is affected by multiple physical fields. The current work presents a novel multiphysics coupling method to model and analyze the lubricated piston skirt–cylinder interface considering the cylinder liner vibration. This method is implemented by coupling multibody dynamics of the crank-connecting rod–piston–cylinder system, the heat transfer of the cylinder and piston, hydrodynamics lubrication on the skirt–cylinder interface, vibration of the cylinder liner, and thermal as well as elastic deformation in the piston–cylinder system together with rheological characteristics of lubricating oil. The proposed method is adopted into a four-stroke gasoline engine to predict its dynamics and tribological characteristics, with the purpose of revealing the influence of cylinder liner vibration on the tribo-dynamics implementation of the piston–cylinder system. The results indicate that increasing the stiffness and damping coefficient of the cylinder is beneficial to suppress the vibration of the system, but it has little effect on the tribological characteristics of the piston skirt–cylinder interface.

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A numerical coupling model for a multibody system with multiple lubricated clearance joints

Cited by 4 publications

References 35 publications

A New Approach for Modeling Mixed Lubricated Piston-Cylinder Pairs of Variable Lengths in Swash-Plate Axial Piston Pumps

A New Approach for Modeling Mixed Lubricated Piston-Cylinder Pairs of Variable Lengths in Swash-Plate Axial Piston Pumps

Piston kinematics of a combustion engine with unconventional crank mechanism

The Tribo-Dynamics Performance of the Lubricated Piston Skirt–Cylinder System Considering the Cylinder Liner Vibration

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