Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Study and experimental analysis of hydraulic fluids compressibility with different viscosities
Submission Author:
Felipe Resende de Souza , MG
Co-Authors:
Luiz Felipe Pereira Scalabrini, MARA NILZA ESTANISLAU REIS, Felipe Resende de Souza
Presenter: Felipe Batista
doi://10.26678/ABCM.COBEM2017.COB17-0408
Abstract
Fluid compressibility is the capacity of the fluid to reduce its volume initially occupied as a function of the pressure applied to it. This capacity is influenced by the following properties: pressure, viscosity, temperature and specific mass. For certain industrial applications where the speed of actuation is not a major influence for higher production, the compressibility in the case of liquids can be disregarded. But for applications where large pressure variations and higher actuation speeds are required, this characteristic should not be neglected because the lower is the compressibility of the hydraulic fluid, the better is the response of the hydraulic system to the driven control. This is due to the fact that when compressing the hydraulic fluid there is a small contraction of its volume, this generates an empty space to be filled with more fluid before getting effective work in the hydraulic system. Thus, the compression of the liquid creates non-uniform movement, movement delay, pressure peaks and oscillations in the hydraulic applications. The properties of the fluids influencing the compressibility modulus, such as viscosity, have been defined in order to emphasize their importance in the hydraulic system. Thus the objective of the present work is to experimentally study the fluid bulk modulus with different viscosities by evaluating the volume variation, when the pressure is increased in a hydraulic double acting cylinder (32/22 x 200 mm). The experimental methodology was implemented in a hydraulic bench of the company FESTO using two different hydraulic fluids: ISO VG46 and ISO VG68.
Keywords
Bulk modulus, experimental, Hydraulic system
