An Empirical Model for the Churning Losses Prediction of Fluid Flow Analysis in Axial Piston Pumps

Li, Ying; Chen, Xing; Luo, Hao; Zhang, Jin

doi:10.3390/mi12040398

Cited by 6 publications

(5 citation statements)

References 18 publications

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“…The simulation model predicts the losses in the lubricating gaps of the rotating group only, neglecting additional frictional losses in the roller bearings, the setting system and due to the oil churning in the housing. This claim can be supported by the fact, that the difference between the measured and simulated hydromechanical efficiency increases with speed, as the churning losses increase with the exponential of the speed, as shown in published models and measurements [35]- [37]. According to the CFD simulations (see Figure 21) the churning losses for this pump at 2100 rpm are close to 5.5 Nm.…”

Section: Simulated Correlation Between Efficiency and Cylinder Block ...supporting

confidence: 55%

Thermal Analysis of the Cylinder Block of an Axial Piston Pump - The Key to Monitoring Efficiency

Ivantysyn,

Weber,

Kunze

et al. 2024

14th International Fluid Power Conference

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To prepare today's fluid power systems for the future digitalization of the industry, it is necessary to improve the information available regarding the current condition of crucial components of the system. Positive displacement machines, which constitute the core of any hydraulic system, play a vital role in this process. Future smart systems will require more information about the current state of the pump such as power usage and efficiency. Current condition monitoring approaches utilize an array of sensors that need to be sampled at high frequency. The transmission, storage, and post processing of this vast amount of data requires an enormous number of resources, especially if exercised at scale. Previous work conducted at the Institute of Mechatronics Engineering at TU Dresden has demonstrated that measuring the temperature in the lubricating gaps can allow for a deeper insight into the tribological mechanisms in these interfaces. Not only can the gap height, viscous friction and leakage be determined from this information, but also crucial information such as wear level and expected component lifespan can be derived from temperature levels with adequate reference models [1]- [4] This paper demonstrates that monitoring the thermal condition of the cylinder block is an effective approach to estimate the pump's efficiency. This will be illustrated through both simulation and measurement, in addition to the pioneering measurement of the heat convection coefficient on the cylinder block surface, a critical boundary condition for the simulation.To measure the temperature of a moving cylinder block, a 160cc axial piston pump was equipped with a telemetric system, which was specially designed and built for this task. Next to the 20 temperature sensors four heat convection coefficient sensors were also carefully placed inside the cylinder block. The resulting measurements did not only validate the simulation but also give a unique insight into the inner workings of a piston pump.

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Section: Simulated Correlation Between Efficiency and Cylinder Block ...supporting

confidence: 55%

Thermal Analysis of the Cylinder Block of an Axial Piston Pump - The Key to Monitoring Efficiency

Ivantysyn,

Weber,

Kunze

et al. 2024

14th International Fluid Power Conference

View full text Add to dashboard Cite

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Section: Mechanical Structure and Operation Principlementioning

confidence: 99%

“…In addition, the churning loss of the guiding rail rotating is less than that of the roller rotating, which is conducive to an increase in mechanical efficiency at high rotational speeds. [21][22][23] In Figure 3(a), the left working chamber is at the maximum volume, and the right working chamber is at the minimum volume. Then, the left working chamber starts to discharge oil and the right working chamber starts to suction oil.…”

Section: Mechanical Structure and Operation Principlementioning

confidence: 99%

Study on mechanical efficiency in a 2D piston pump with rail rotation based on Hertz contact theory

Huang

Shao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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A 2D piston pump’s mechanical efficiency is limited at high rotational speeds, in particular, its mechanical efficiency decreases as its load pressure rises. In this paper, the conventional 2D piston pump is redesigned by changing its suspension rotation into rail rotation to decrease mechanical loss. The mechanical efficiency of this new 2D piston pump is studied by building a mathematical model for analyzing the relationship between the load and the mechanical loss caused by the rolling of the cone rollers on the guiding rails. Hertz contact theory is used for the first time for such analysis. Test results prove that the mechanical efficiency of the 2D piston pump with rail rotation is better than that of a 2D piston pump with suspension rotation, with the former’s mechanical efficiency increasing with the load. According to theoretical analysis and test results, the material used to manufacture the cone rollers and guiding rails is changed from 45 steel to GCr15 to improve the mechanical efficiency of the developed 2D piston pump further.

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“…A gear pump is also integrated into the main shaft to function as the pilot pump for supplying control pressure to the control system. The compact structure, high working pressure, high power density, high volumetric efficiency, and ease of variable realization render the bi-tandem axial piston pump an excellent choice for serving as the main power source for high-pressure, high-speed, and high-power engineering hydraulic systems [23][24][25]. Notably, the tandem pump enables both common and individual supplies of oil to one or more working devices, making it a highly flexible option for coordinating multiple actuators.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of the Bi-Tandem Axial Piston Pump with Dual-Loop Positive Flow Control under Pressure Disturbance

et al. 2023

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The bi-tandem axial piston pump is an indispensable powerhouse in high-pressure and high-power engineering hydraulic systems, with its output flow response characteristics under pressure disturbance exerting a significant influence on the working process of double pumps. Unfortunately, the stability of the original single-loop mechanical–hydraulic servo control system is sensitive to unpredictable interference. To alleviate this quandary, this paper proposes a dual-loop positive flow control method for the flow control of the bi-tandem axial piston pump, establishes a mathematical model of the bi-tandem axial piston pump with dual-loop positive flow control, and establishes a simulation model based on Simulink. The validity of the model is verified by experiments. The performance advantages of the dual-loop positive flow control method relative to the single-loop positive flow control method are analyzed. The results show a faster response speed and smaller steady-state error with the dual-loop method, which performs better than the original single-loop positive flow control. Furthermore, the study examines the influence of different forms, degrees, and directions of pressure disturbance on the dynamic response characteristics of the bi-tandem axial piston pump. Symmetric pressure disturbance results in an increase in the maximum relative error of the output flow proportional to its degree. Notably, the influence of asymmetric pressure disturbance on the output flow of the double pumps possesses characteristics of a superimposable nature, and the steady-state value of the output flow is highly dependent on superimposed pressure disturbance and less affected by the action time point of asymmetric pressure disturbance. Further, the unloading pressure disturbance exerts less influence on the system compared to the loading pressure disturbance. This paper provides valuable insights into improving the response speed and control accuracy of bi-tandem axial piston pumps equipped with positive flow control.

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An Empirical Model for the Churning Losses Prediction of Fluid Flow Analysis in Axial Piston Pumps

Cited by 6 publications

References 18 publications

Thermal Analysis of the Cylinder Block of an Axial Piston Pump - The Key to Monitoring Efficiency

Thermal Analysis of the Cylinder Block of an Axial Piston Pump - The Key to Monitoring Efficiency

Study on mechanical efficiency in a 2D piston pump with rail rotation based on Hertz contact theory

Dynamic Response Analysis of the Bi-Tandem Axial Piston Pump with Dual-Loop Positive Flow Control under Pressure Disturbance

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