Table 1 - uploaded by Paul W. Michael
Content may be subject to copyright.
Hydraulic fluid properties
Source publication
INTRODUCTION This paper examines the relationship between axial piston motor efficiency and viscosity. The volumetric, mechanical, and overall efficiencies of hydraulic motors were measured under steady state conditions. Newtonian and non-Newtonian antiwear hydraulic fluids were evaluated at 50°C and 80°C. Dimensionless viscosity values for mechani...
Contexts in source publication
Context 1
... motors differ from pumps in that a pump converts rotary motion into flow, while a hydraulic motor converts flow (from the pump) into rotary motion. Table 1 lists the properties of four ISO VG 46 hydraulic fluids that were evaluated in this investigation. The kinematic viscosity after the ASTM D5621 40-minute sonic shear test is reported. ...
Citations
... The kinematic viscosity was determined at 40⁰ and 100⁰C before and after the ASTM D5621 40-minute sonic shear test. This method was found to correlate with volumetric efficiency in earlier investigations [22]. All of the fluids exhibited a high-degree of shear stability with a viscosity loss of less than 6%. ...
... This method was found to correlate with volumetric efficiency in earlier investigations [22]. All of the fluids exhibited 8 a high-degree of shear stability with a maximum viscosity loss of less than 6%. ...
... ) was estimated from the relationship between the actual pump flow rate () a Q and rotational frequency of the pump as shown in eqn.(22). ...
This paper describes an investigation into the effects of fluid properties on piston pump flow losses through experimentation and modeling. The case drain and pressure compensator control flow rates of a variable-displacement axial piston pump were measured under a wide range of conditions. Synthetic ester, high bulk modulus, VI-improved and single grade mineral oils were evaluated. The high bulk modulus fluid exhibited 20% lower flow losses than a conventional mineral oil of the same viscosity grade. The modeling effort extended the flow loss analysis of Jeong to account for compensator control of the pump displacement. Comparisons between model predictions and measured flow losses showed good agreement. Stepwise regression analysis of the model parameters disclosed that the compressible flow term had a greater coefficient of determination than the turbulent or laminar flow terms. These findings demonstrate the potential of combining comprehensive fluid analysis with modeling to optimize fluids for the efficient transmission of power.
Copyright © 2015 by ASME Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
