The direct measurement of the cylinder block dynamic characteristics based on a non-contact method in an axial piston pump

Xu, Haogong; Zhang, Junhui; Sun, Guangmin; Huang, Weidi; Huang, Xiaochen; Lyu, Fei; Xu, Bing; Su, Qi

doi:10.1016/j.measurement.2020.108279

Cited by 17 publications

(4 citation statements)

References 26 publications

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“…As most of these empirical studies were not performed in an actual pump environment, efficiency tests were infeasible. In the past two decades sensors and electronics have allowed for a less invasive measurement of both gap height and temperature in fully functional pumps [9]- [11], [24], [25], [29]- [32]. However, the findings mostly focused on the validation of simulation models, rather than a pump analysis.…”

Section: Literaturementioning

confidence: 99%

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: Literaturementioning

confidence: 99%

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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“…It showed that mixed friction between the cylinder block and valve plate occurred under certain conditions. Xu et al [17] used a noncontact test scheme to measure the multi-freedom displacement of the cylinder block, indicating that the cylinder block real-timely fluctuates periodically in the multi-freedom displacement. Zhang et al [18] experimentally measured the three-point oil film thickness of the valve plate pair of an axial piston pump, established the oil film shape formula, and inferred that the wedge angle of the valve plate pair was affected by multiple factors.…”

Section: Introductionmentioning

confidence: 99%

Study on Temperature Characteristics of Lubrication Film of Valve Plate Pair in Axial Piston Pumps

Zhang,

Ma,

et al. 2024

Applied Sciences

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The film temperature distribution of the valve plate pair in axial piston pumps affects its lubrication, leakage, and friction. In order to investigate the film temperature distribution of the valve plate pair in axial piston pumps, a test platform was constructed including three displacement sensors for the oil film thickness and eleven thermocouples for the film temperature distribution of the valve plate pair. An accurate film shape model of the valve plate pair was built according to the three-point film thickness test data. Based on the film shape model, the film temperature model of the valve plate pair was developed considering the viscous oil temperature characteristics, the energy loss caused by leakage and viscous friction in the film, and the heat conduction among the oil, cylinder block, and valve plate. The influence of different swash plate tilt angles and operating pressures on the valve plate film temperature was studied. The test results indicate that the film temperature of the valve plate pair increases as the working pressure and swash plate tilt angle increase. The theoretical and experimental absolute errors of the film temperature in the circumferential range [−60°, 60°] of the valve plate high-pressure side are less than 3.5 °C. As the swash plate tilt angle varies from 12° to 16° and working pressure from 3 MPa to 7 MPa, the minimum film thickness position and the maximum temperature point move accordingly in the circumferential range [−15°, 5°] of the valve plate pair.

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“…The tightness of the pistoncylinder coupling is affected by the dynamic characteristics of the cylinder block at operating pressure. In [4], a measurement scheme was proposed to accurately determine the dynamic characteristics of a cylinder block.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of fluoroplastic seals of axial-piston pumps in relation to the operating conditions of a hydraulic drives

Alisin

2023

E3S Web Conf.

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The article considers the issues associated with the elastic and plastic properties of fluoroplastic in the state of delivery and radiation hardened. The statement about the radiation hardening of fluoroplastic improves thermal deformation characteristics is substantiated. The results of kinetic microindentation are studied in comparison with the initial state in the temperature range of 80 - 400 0C. The effect of temperature on the ratio of the work of the elasticity and plasticity forces is analyzed. Particular attention is paid to the elastic properties of fluoroplastic. The assumption is substantiated that it is possible to improve the elastic properties of fluoroplastic by radiation treatment at elevated temperatures, which are typical for high-speed axial piston pumps. On the basis of the study, it was found that the use of radiation hardening treatment of fluoroplastic is promising for increasing the durability of movable seal rings.

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The direct measurement of the cylinder block dynamic characteristics based on a non-contact method in an axial piston pump

Cited by 17 publications

References 26 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 Temperature Characteristics of Lubrication Film of Valve Plate Pair in Axial Piston Pumps

Mechanical properties of fluoroplastic seals of axial-piston pumps in relation to the operating conditions of a hydraulic drives

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