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Research Papers

Overall Efficiency Evaluation of a Hydraulic Pump With External Drainage Through Temperature Measurements

[+] Author and Article Information
Paolo Casoli

Department of Engineering and Architecture,
University of Parma,
Parma 43124, Italy
e-mail: paolo.casoli@unipr.it

Federico Campanini

Department of Engineering and Architecture,
University of Parma,
Parma 43124, Italy
e-mail: federico.campanini@studenti.unipr.it

Andrea Bedotti

Department of Engineering and Architecture,
University of Parma,
Parma 43124, Italy
e-mail: andrea.bedotti@studenti.unipr.it

Mirko Pastori

Department of Engineering and Architecture,
University of Parma,
Parma 43124, Italy
e-mail: mirko.pastori@studenti.unipr.it

Antonio Lettini

Casappa S.p.A.,
Parma 43044, Italy
e-mail: lettiniA@casappa.com

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT,AND CONTROL. Manuscript received April 12, 2017; final manuscript received December 7, 2017; published online March 7, 2018. Assoc. Editor: Zongxuan Sun.

J. Dyn. Sys., Meas., Control 140(8), 081005 (Mar 07, 2018) (9 pages) Paper No: DS-17-1191; doi: 10.1115/1.4039084 History: Received April 12, 2017; Revised December 07, 2017

In the recent years, industries have been working on the online condition monitoring of systems and components in order to definitely abandon the time-based maintenance and switch efficiently to a condition-based maintenance. Therefore, the research field related to prognostics and health management (PHM) has been gaining more and more importance. In the field of hydraulic pumps and motors, the overall efficiency is an important parameter to monitor and the thermodynamic method has historically been proposed for the online evaluation of this parameter for hydraulic machines without external drainage. Indeed, for this kind of machines, the thermodynamic method allows the evaluation of the overall efficiency by measuring only the temperatures and the pressures at the suction and the delivery ports, thus avoiding the use of cumbersome and expensive sensors, such as flow meters and torque sensors. This paper investigates the use of the thermodynamic method for hydraulic machines with external drainage. The case study of a swash-plate type axial-piston pump is considered. In this first part of the project, the objective was to validate the proposed thermodynamic method by comparing its results with the ones obtained through the mechanical, therefore an extensive experimental activity was carried out and two flow meters were used to measure the drainage and the delivery flow rates. The pump was tested in different operating conditions and the uncertainty related to the overall efficiency was calculated accurately in order to compare the two approaches properly.

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References

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Figures

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Fig. 1

Energy and mass fluxes for the hydraulic pump

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Fig. 2

Enthalpy–entropy diagram for the mineral oil VG 46 used. The fluid states at the hydraulic ports (1 suction, 2 delivery, 3 drainage) are represented for a case study (angular velocity 2000 r/min, displacement 51 cm3, delivery pressure 15 MPa).

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Fig. 8

Efficiency comparison at 1500 r/min, swash-plate angle 5 deg, inlet oil temperature 70 °C

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Fig. 9

Efficiency comparison at 1500 r/min, swash-plate angle 10 deg, inlet oil temperature 70 °C

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Fig. 10

Efficiency comparison at 2000 r/min, swash-plate angle 5 deg, inlet oil temperature 70 °C

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Fig. 11

Efficiency comparison at 2000 r/min, swash-plate angle 10 deg, inlet oil temperature 70 °C

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Fig. 12

Efficiency comparison in the step test 50–150 bar, 1500r/min, swash-plate angle 10, inlet oil temperature 50 °C

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Fig. 5

Efficiency comparison at 1500 r/min, swash-plate angle 10 deg, inlet oil temperature 50 °C

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Fig. 6

Efficiency comparison at 2000 r/min, swash-plate angle 5 deg, inlet oil temperature 50 °C

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Fig. 7

Efficiency comparison at 2000 r/min, swash-plate angle 10 deg, inlet oil temperature 50 °C

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Fig. 4

Efficiency comparison at 1500 r/min, swash-plate angle 5 deg, inlet oil temperature 50 °C

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Fig. 3

Hydraulic scheme of the experimental setup

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Fig. 13

Efficiency comparison in step test 50–150 bar, 1500 r/min, swash-plate angle 10

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Fig. 14

ΔT21 in the step test 50–150 bar

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Fig. 15

ΔT31 in the step test 50–150 bar

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