Bubble Elimination from Working Oil for Environmentally Friendly Hydraulic System Design

2012 ◽  
Vol 6 (4) ◽  
pp. 488-493 ◽  
Author(s):  
Yutaka Tanaka ◽  
◽  
Sayako Sakama ◽  
Ryushi Suzuki ◽  
Keyword(s):  
Cost Reduction ◽  
Hydraulic System ◽  
High Performance ◽  
Swirl Flow ◽  
Hydraulic Fluid ◽  
Air Bubbles ◽  
Hydraulic Systems ◽  
Hydraulic Fluids ◽  
Technical Issues ◽  
Hydraulic System Design

With a view to environmental compatibility, energy saving, cost reduction, and high performance and efficiency, one trend in hydraulic systems, particularly in mobile markets, is to design them to be more compact, require less hydraulic fluid in the reservoir, and use their working hydraulic fluid longer. Air bubbles entrained in working hydraulic fluids have greatly detrimental effects on the function and lifetime of hydraulic fluids, components, and systems. A bubble eliminator using a swirl flow that can eliminate air bubbles from working hydraulic fluid has been proposed and developed by our smart and clean hydraulic project. This paper focuses on technical issues related to air bubbles, the aging process of hydraulic oil, and a field test of the performance of the bubble eliminator.

Optimization of Bubble Eliminator Through Numerical and Experimental Investigation

2012 ◽  
Vol 6 (4) ◽  
pp. 418-425 ◽  
Author(s):  
Sayako Sakama ◽  
◽  
Yutaka Tanaka ◽  
Ryushi Suzuki ◽  
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Flow Visualization ◽  
Swirl Flow ◽  
Optimal Shape ◽  
Air Bubbles ◽  
Hydraulic Systems ◽  
Inlet Tube ◽  
Technical Issues ◽  
Selection Of

Air bubbles in working oil affect the stiffness and efficiency of hydraulic systems; thus it is important for technical issues that air bubbles be actively eliminated from the hydraulic oil. A bubble eliminator is a device that uses a swirl flow to remove air bubbles. The shape of the device affects bubble elimination performance, so the selection of shape is the most important parameter in increasing the performance of the device. The purpose of this study is to design a bubble eliminator with an optimal shape. This paper discusses the validity of numerical simulation by comparing, using various diameters of the vent port, the numerical results with the results of the experimental flow visualization. Moreover, we focus on the length of the inlet tube and tapered tube of the bubble eliminator and establish a method of selecting them.

Ensuring the Reliability of an Aircraft Engine Hydraulic System

2014 ◽  
Vol 616 ◽  
pp. 126-134 ◽  
Author(s):  
Janka Mihalčová ◽  
Peter Šmeringai
Keyword(s):  
Hydraulic System ◽  
Kinematic Viscosity ◽  
Chemical Properties ◽  
Aircraft Engine ◽  
Hydraulic Fluid ◽  
Aircraft Engines ◽  
Ftir Analysis ◽  
Physical Chemical ◽  
Hydraulic Fluids ◽  
Degradation Degree

The article deals with the issue of ensuring the reliability of aircraft engines operation via hydraulic fluids properties monitoring. There are presented the results of the hydraulic fluid Aero Shell Fluid 41 (ASF 41) properties evaluation in the hydraulic system of a double-flow turbosupercharged aircraft engine AI-25TL. In the hydraulic fluid, there were observed the quantity and distribution of mechanical particles according to their size in accordance with the ISO Cleanliness Code, ISO 4406.There was also determined kinematic viscosity according to the standard EN ISO 3104+AC. FTIR analysis of the infrared spectrum was used to determine the degradation degree of the hydraulic fluid physical-chemical properties.

scholarly journals Performance parameters monitoring of the hydraulic system with bio-oil

2014 ◽  
Vol 60 (Special Issue) ◽  
pp. S37-S43 ◽  
Author(s):  
I. Janoško ◽  
T. Polonec ◽  
S. Lindák
Keyword(s):  
Hydraulic System ◽  
Performance Parameters ◽  
Hydraulic Systems ◽  
Hydraulic Pump ◽  
Significant Deterioration ◽  
Environment Friendly ◽  
Bio Oil ◽  
Hydraulic Fluids ◽  
Contact Sensor ◽  
The Impact

In environmental terms, hydraulic fluids used in the hydraulic system of municipal vehicles represent problems related to a potential leakage from the system into the environment and the subsequent contamination of groundwater and soil. More environment-friendly way is to use green hydraulic fluids that are biodegradable in accidents. This paper aims to investigate the possibilities of biodegradable oil application and its adaptation in the hydraulic systems of municipal vehicles by monitoring the impact of the bio-oil Mobil EAL 46 ESSO on the performance parameters as flow, efficiency, durability, etc. Hydraulic pump revolutions were measured using a non-contact sensor based on the principle of magnetic induction change. Method of tightness monitoring was used to achieve results for functionality and wear of the hydraulic system. During 600 h of the test period no significant deterioration of performance parameters was detected. Results are useful for companies involved in waste collection.

Improving Hydraulic System Energy Efficiency With High-Performance Hydraulic Fluids

2014 ◽  
Vol 50 (2) ◽  
pp. 1313-1321 ◽  
Author(s):  
Franklin L. Quilumba ◽  
Lyndon K. Lee ◽  
Wei-Jen Lee ◽  
Alan Harding
Keyword(s):  
Energy Efficiency ◽  
Hydraulic System ◽  
High Performance ◽  
Hydraulic Fluids ◽  
System Energy

scholarly journals The importance of the electrical properties of hydraulic fluids

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Darko Lovrec ◽  
Vito Tič
Keyword(s):  
Electrical Properties ◽  
Hydraulic System ◽  
Basic Material ◽  
Hydraulic Fluid ◽  
Content Type ◽  
Mineral Oils ◽  
Ionic Fluids ◽  
Hydraulic Fluids ◽  
Conductive Properties ◽  
Degree Of Degradation

Purpose Apart from the basic material properties of liquid lubricants, such as, e.g., the viscosity and density of the hydraulic fluid, it is also important to have information regarding the electrical properties of the fluid used. The latter is closely related to the purpose, type, structure, and conditions of use of a hydraulic system, especially the powertrain design and fluid condition monitoring. The insulating capacity of the hydraulic fluid is important in cases where the electric motor of the pump is immersed in the fluid. In other cases, on the basis of changing the electrical conductive properties of the hydraulic fluid, we can refer its condition, and, on this basis, the degree of degradation. Design/methodology/approach The paper first highlights the importance of knowing the electrical properties of hydraulic fluids and then aims to compare these properties, such as the breakdown voltage of commonly used hydraulic mineral oils and newer ionic fluids suitable for use as hydraulic fluids. Findings Knowledge of this property is crucial for the design approach of modern hydraulic compact power packs. In the following, the emphasis is on the more advanced use of known electrical quantities, such as electrical conductivity and the dielectric constant of a liquid. Originality/value Based on the changes in these quantities, we have the possibility of real-time monitoring the hydraulic fluid condition, on the basis of which we judge the degree of fluid degradation and its suitability for further use.

scholarly journals Influence of differently viscous hydraulic fluid on the flow behaviour inside a hydraulic tank

2021 ◽  
Author(s):  
Ignacijo Biluš ◽  
Luka Lešnik ◽  
Luka Kevorkijan ◽  
Darko Lovrec
Keyword(s):  
Material Properties ◽  
Hydraulic System ◽  
Flow Behaviour ◽  
Hydraulic Fluid ◽  
Entire System ◽  
Flow Conditions ◽  
Lower Viscosity ◽  
Hydraulic Fluids ◽  
Detailed Simulation ◽  
The Impact

The viscosity of a hydraulic fluid is certainly one of the most important material properties of a fluid, as it affects a whole range of phenomena in the hydraulic system and the operation of the entire system. Among other things, it affects the efficiency of the hydraulic device directly. Thus, the development of hydraulic fluids goes in the direction of fluids with lower viscosity, which, in turn, results in different flow behaviour and processes inside the hydraulic tank. The paper presents the results of a study of the flow conditions in a small hydraulic tank for cases of different fluid viscosities. The results were obtained based on a detailed simulation of conditions inside the tank. Apart from the impact of the changed flow conditions, the lower viscosity of the liquid also influences the elimination of solid contaminants and air.

Development of an Extended Duration 1200 Deg F Torque Motor

1963 ◽  
Vol 85 (1) ◽  
pp. 123-128
Author(s):  
J. R. Farron
Keyword(s):  
Air Force ◽  
Hydraulic System ◽  
High Performance ◽  
Material Selection ◽  
Test Results ◽  
Hydraulic Systems ◽  
Flight Vehicles ◽  
Control Functions ◽  
Motor Design ◽  
Extended Duration

The application of high performance fluid power servos for attitude and engine control functions to advanced flight vehicles necessitates advancing the state-of-the-art of hydraulic systems in regard to their sensitivity to environmental conditions. In order to achieve this objective, the Air Force has sponsored the design and development of a 1000 deg F hydraulic system. This paper reviews the development and evaluation of an extended duration 1200 deg F torque motor representing the first component developed specifically for this system. Emphasis in the paper is placed on the approach to material selection, motor design, and the test results obtained.

Adaptive Robust Control of a Pump Control Hydraulic System

2017 ◽  
Author(s):  
Bobo Helian ◽  
Zheng Chen ◽  
Bin Yao ◽  
Yi Yan ◽  
Chiang Lee
Keyword(s):  
Robust Control ◽  
Hydraulic System ◽  
High Performance ◽  
Position Control ◽  
Controller Design ◽  
Volume Ratio ◽  
High Order ◽  
Adaptive Robust Control ◽  
Hydraulic Systems ◽  
Servo Motor

Pump control hydraulic systems have been widely used in industry by the advantages of no throttling loss and overflow loss as well as high power-to-volume ratio. However, the characteristics of high order dynamics, high nonlinearities and disturbances make the accurate position control of those systems very challenging. And to implement the controllers easily, some dynamics such as servo motor loop are usually ignored in most of existing methods, which may lead to the limitation of closed-loop bandwidth and disturbance rejection ability. In this paper, adaptive robust control (ARC) algorithm is utilized in a pump control electro-hydrualic system. The ARC guarantees the stability and high performance in the presence of model uncertainties and nonlinear disturbances. For the high-order of the hydraulic system, a modified three-step backstepping method is constructed which is covering the whole electro-hydraulic system. The servo motor-pump dynamics is taken into considered in the three-step adaptive backstepping controller design. Theoretical control performance based on Lyapunov functions and the simulation results proved that the control strategy this paper proposed achieved high performance in spite of the nonlinearities and uncertainties.

Modeling of Cavitation-Induced Air Release Phenomena in Micro-Orifice Flows

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Hans-Arndt Freudigmann ◽  
Aaron Dörr ◽  
Uwe Iben ◽  
Peter F. Pelz
Keyword(s):  
Mass Transfer ◽  
Hydraulic System ◽  
System Simulation ◽  
Air Bubbles ◽  
Hydraulic Systems ◽  
Modeling Approach ◽  
Diffusive Mass Transfer ◽  
Orifice Flow ◽  
Flow Through ◽  
Dissolved Air

Impurities like air bubbles in hydraulic liquids can significantly affect the performance and reliability of hydraulic systems. The aim of this study was to develop a model suited for hydraulic system simulation to determine the rate of degassing of dissolved air in a micro-orifice flow at cavitating conditions. An existing model for the flow through a micro-orifice was extended to account for the generation of vapor which is suggested to play the key-role for the degassing mechanism. In comparison with measurements, the results of the modeling approach imply that diffusive mass transfer of dissolved air into generated vapor cavities is the dominating mechanism for the observed air release phenomena.

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