The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform
Monika Ivantysynova - One of the best experts on this subject based on the ideXlab platform.
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Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation
Energies, 2019Co-Authors: Rene Chacon, Monika IvantysynovaAbstract: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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An Investigation of Design Parameters Influencing the Fluid Film Behavior in Scaled Cylinder Block/Valve Plate Interface
9th FPNI Ph.D. Symposium on Fluid Power, 2016Co-Authors: L. Shang, Monika IvantysynovaAbstract:The efficiency of an axial piston pump or motor is dominated by the volumetric and torque losses of the three main lubricating interfaces (piston/cylinder, cylinder Block/Valve plate, and slipper/swash plate). The research study in this paper only focuses on the cylinder Block/Valve plate interface. The goal of this research is to investigate a novel approach for scaling the cylinder Block/Valve plate interface to have the same percentage of volumetric and torque losses of the baseline interface. To achieve this research goal, many design parameters influencing the performance of the interface are investigated. An in-house developed fluid structure and thermal interaction model was used to analyze the cylinder Block/Valve plate interface including the resulting parts temperature, the parts elastic deformation due to pressure and thermal load, the fluid film properties and resulting energy dissipation, friction torque, and leakage of cylinder Block/Valve plate interfaces. This model is utilized to simulate the cylinder Block/Valve plate interface performance of different sizes of the displacement units. In this paper, the displacement volume of the biggest unit is sixty-four times larger than the smallest unit. The computational study reveals the design parameters influencing the elastic deformations of the solid parts and the energy dissipation and stability of the fluid film in cylinder Block/Valve plate interface of different sizes. Based on these investigations, a novel scaling approach to scale the cylinder Block/Valve plate interface is discussed.
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Advanced Virtual Prototyping of Axial Piston Machines
9th FPNI Ph.D. Symposium on Fluid Power, 2016Co-Authors: Rene Chacon, Monika IvantysynovaAbstract:This paper explains how a combination of advanced multidomain numerical models can be employed to design an axial piston machine of swash plate type within a virtual prototyping environment. Examples for the design and optimization of the cylinder Block/Valve plate interface are presented.Copyright © 2016 by ASME
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An Investigation of the Impact of the Elastic Deformation of the End case/Housing on Axial Piston Machines Cylinder Block/Valve Plate Lubricating Interface
2016Co-Authors: Rene Chacon, Monika IvantysynovaAbstract:The cylinder Block/Valve plate interface is a critical design element of axial piston machines. In the past, extensive work has been done at Maha Fluid Power Research center to model this interface were a novel fluid structure thermal interaction model was developed which accounts for thermal and elasto-hydrodynamic effects and has been proven to give an accurate prediction of the fluid film thickness. This paper presents an in-depth investigation of the impact of the elastic deformation due to pressure and thermal loadings of the end case/housing on the performance of the cylinder Block/Valve plate interface. This research seeks to understand in a systematic manner the sensitivity of the cylinder Block/Valve plate interface to the structural design and material properties. A comparison between simulations results is done by utilizing different end case designs and material compositions, both in the Valveplate and end case solids.
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Port and case flow temperature prediction for axial piston machines
International journal of fluid power, 2015Co-Authors: L. Shang, Monika IvantysynovaAbstract:Researchers at Purdue’s Maha Fluid Power Research Center have developed models that will enable computational design of piston machines. The core of the in-house developed program forms multi-domain models capturing the fluid–structure interaction phenomena taking place in the main lubricating interfaces (piston/cylinder, cylinder Block/Valve plate, and slipper/swash plate) of axial piston machines. The model allows studying the influence of a given pump or motor design on machine performance, power loss, and energy dissipation in those main lubricating interfaces. The behavior of the fluid film in these lubricating interfaces as well as the shape of the solid parts is temperature and pressure dependent. In order to solve for non-isothermal flow and to consider elasto-hydrodynamic effects, port and case temperatures are needed as boundary condition for the model. In case of analysis and optimization of existing pumps and motors, those boundary conditions can be taken from steady-state measurements; howeve...
Rene Chacon - One of the best experts on this subject based on the ideXlab platform.
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Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation
Energies, 2019Co-Authors: Rene Chacon, Monika IvantysynovaAbstract: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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Advanced Virtual Prototyping of Axial Piston Machines
9th FPNI Ph.D. Symposium on Fluid Power, 2016Co-Authors: Rene Chacon, Monika IvantysynovaAbstract:This paper explains how a combination of advanced multidomain numerical models can be employed to design an axial piston machine of swash plate type within a virtual prototyping environment. Examples for the design and optimization of the cylinder Block/Valve plate interface are presented.Copyright © 2016 by ASME
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An Investigation of the Impact of the Elastic Deformation of the End case/Housing on Axial Piston Machines Cylinder Block/Valve Plate Lubricating Interface
2016Co-Authors: Rene Chacon, Monika IvantysynovaAbstract:The cylinder Block/Valve plate interface is a critical design element of axial piston machines. In the past, extensive work has been done at Maha Fluid Power Research center to model this interface were a novel fluid structure thermal interaction model was developed which accounts for thermal and elasto-hydrodynamic effects and has been proven to give an accurate prediction of the fluid film thickness. This paper presents an in-depth investigation of the impact of the elastic deformation due to pressure and thermal loadings of the end case/housing on the performance of the cylinder Block/Valve plate interface. This research seeks to understand in a systematic manner the sensitivity of the cylinder Block/Valve plate interface to the structural design and material properties. A comparison between simulations results is done by utilizing different end case designs and material compositions, both in the Valveplate and end case solids.
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An Investigation of the Impact of Micro Surface on the Cylinder Block/Valve Plate Interface Performance
8th FPNI Ph.D Symposium on Fluid Power, 2014Co-Authors: Rene Chacon, Monika IvantysynovaAbstract:Lubricating gaps are the primary source of energy dissipation in axial piston machines of swash plate-type. One of these lubricating gaps is designated as the cylinder Block/Valve plate interface, and is one of the most critical design elements for this type of positive displacement machine. In the past, extensive work has been done at Maha Fluid Power Research Center both to model this interface and to study the effects of micro-surface shaping on the Valve plate. This paper presents a more in-depth investigation into optimizing Valve plate micro-surface shaping (both by altering the number and amplitude of waves) in order to achieve a fluid film thickness that compromises between leakage and torque loss, minimizes power loss in the cylinder Block/Valve plate interface, and maximizes machine efficiency.Copyright © 2014 by ASME
R. Shateri - One of the best experts on this subject based on the ideXlab platform.
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Numerical and experimental study of open die forging process design for producing heavy Valves
International Journal on Interactive Design and Manufacturing (IJIDeM), 2018Co-Authors: A Abedian, Behrooz Shirani Bidabadi, R. ShateriAbstract:In this study, the finite element method was used to produce a Y-Block Valve with a weight of 2042 kg. To compare the new process with the traditional production process for this workpiece, both were simulated using finite element ABAQUS software. The viscoplastic properties of material were measured using a thermomechanical simulator (plasto-dilatometer),and then the two models were simulated in three dimensions, incorporating a fully coupled thermal stress analysis. The material flow, stress, strain and temperature distributions, dimensions of the original workpiece, and force required were compared via simulations. The new process was found to not only reduce the machining required but also increase the strength of the workpiece, reduce the force needed for forging, and allow the use of a smaller initial ingot. Finally, the new model was tested experimentally and a good match was found between the experimental and simulation results. The new introduced finite element model has potential applications in real production.
Jiang Jihai - One of the best experts on this subject based on the ideXlab platform.
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Study on the Influence of Speed on the Cylinder Block Overturning process of Aerospace Bent-axis Piston Pump
2019 IEEE 8th International Conference on Fluid Power and Mechatronics (FPM), 2019Co-Authors: Jiang Jihai, Du Boran, Zhang Biao, Hu ZhidongAbstract:Bent-axis piston pump is the core component of hydraulic system inaerospace and cylinder Block-Valve plate pair is the most complicated contact pair within the pump. The cylinder Block will inevitably tilt in the process of rotation, on the one hand, it will lead to excessive leakage of the cylinder Block-Valve plate pair and reduce the volumetric efficiency. On the other hand, the surface wear of Valve plate is aggravated, which seriously restricts the life of piston pump. This paper analyses the impacet of inertia force and centrifugal force of piston-connecting rod on balance the cylinder Block, and the acting point trajectory of the force between psiton and cylinder. Within one piston interval angle, the change rules of the resultant torque and its radius acting on cylinder Block with increasing speed are analyzed quantitatively. It lays a foundation for further research on the relationship between cylinder Block motion and flow characteristics in cylinder Block-Valve plate pair of bent-axis piston pump.
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An Approach to Predict Wear Distribution of Valve Plate in Elasto-Hydrodynamic Lubrication
IEEE Access, 2019Co-Authors: Jiang Jihai, Yan WeipengAbstract:The leakage flow is the vital index judging axial piston pumps, which is strongly influenced by the wear resulting from the cylinder Block tipping against the Valve plate. In order to improve the energy efficiency and realize the reliable design of axial piston pumps, this paper presents an integrated model to predict the cylinder Block/Valve plate interface performance, numerically solving Reynolds equation coupled with the elasto-hydrodynamic deformations, the pressure-viscosity effect, and the asperity contacts. The film thickness distribution in steady state is numerically calculated, then the wear distribution under different kinds of operating conditions can be predicted based on the Archard wear equation. The analytical results indicate that the wear appears at both sides of the inner dead point, which is verified through measuring results. The proposed approach shows an essential prediction on the wear distribution.
Jihai Jiang - One of the best experts on this subject based on the ideXlab platform.
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Analysis on micro-motion of cylinder Block based on elasto-hydrodynamic lubrication
Industrial Lubrication and Tribology, 2019Co-Authors: Jihai Jiang, Ge-qiang LiAbstract:The purpose of this paper is to analyze the micro-motion of the cylinder Block.,Based on the elasto-hydrodynamic lubrication, a numerical model for the cylinder Block/Valve plate interface is proposed, with consideration of the elastic deformations, the pressure-viscosity effect and asperity contacts. The influence-function method is applied to calculating the actual deformations of the cylinder Block and the Valve plate. The asperity contact model simplified from Greenwood assumption is introduced into the numerical model. Furthermore, the relationship between the micro-motion and the operating condition, the sealing belt width is discussed, respectively.,The results show an increase in the discharge pressure causes the tilt state and the vibrating motion getting worse, which can be eased by improving the rotational speed, the sealing belt width and the ratio of external and internal sealing belt width.,The proposed research can provide a theoretical reference for the optimizing design of cylinder Block/Valve plate pair.
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Effect of Temperature on the Cylinder Block/Valve Plate Interface Performance
2019 IEEE 8th International Conference on Fluid Power and Mechatronics (FPM), 2019Co-Authors: Jihai JiangAbstract:The cylinder Block/Valve plate interface plays the most important role in the axial piston pump output performances, which is strongly affected by the temperature, so the analysis on the temperature is needed to realize the optimizing design. Based on the elasto-hydrodynamic lubrication, a numerical model for the cylinder Block/Valve plate interface is proposed, with consideration of the elastic deformation, pressure-viscosity effect and temperature-viscosity effect. Physical field distributions of the oil film are numerical calculated in MATLAB with the finite difference discretization. The impact of different temperatures on the steady oil film thickness, the leakage and the power loss is analyzed. The simulation model can be used in the analysis of the cylinder Block/Valve plate interface.
