Abstract

In this article, the second method of determination of the theoretical and actual working volume of a hydraulic motor is described. The proposed new method is based on the characteristics of effective absorbency of the motor. The effective absorbency has been defined as the ratio of flow rate in a motor to the rotational speed of the motor’s shaft. It has been shown that the effective absorbency is a nonlinear function of the rotational speed and nonlinear function of the pressure drop in the motor’s working chambers. Furthermore, it has been proven that the actual working volume of a motor is a function of a third degree of pressure drop in the motor’s working chamber. The actual working volume should be taken to assess the mechanical and volumetric energy losses in the motor. Furthermore, the influence of the flowmeter location in the measurement system and the compressibility of liquid on the result of the theoretical and actual working volume calculation was also taken into account and is described in this article. The differences in the assessment of the volumetric efficiency assuming the theoretical and actual working volume was also shown.

Highlights

  • For users and designers of a hydraulic system, the volumetric and pressure-mechanical efficiency of the hydraulic positive displacement machine is very important [1,2,3,4,5,6]

  • The theoretical working volume qt is a parameter that corresponds to the volume of liquid flowing without energy losses through the positive displacement machine during one full rotation of the shaft

  • The value of qt is constant in the whole range of the rotational speed n and the pressure drop ∆p in a positive displacement machine [7,8,9,10,11,12,13,14]

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Summary

Introduction

For users and designers of a hydraulic system, the volumetric and pressure-mechanical efficiency of the hydraulic positive displacement machine (motor or pump) is very important [1,2,3,4,5,6] These efficiencies are calculated based on the theoretical working volume qt. The value of qt is constant in the whole range of the rotational speed n and the pressure drop ∆p in a positive displacement machine [7,8,9,10,11,12,13,14] It happens that the geometric working volume qg is used instead of the qt to calculate the energy losses in positive displacement machines.

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