scholarly journals Laboratory tests of the hydraulic pump operating load with monitoring of changes in the physical properties

2021 ◽  
Vol 54 (3-4) ◽  
pp. 243-251
Author(s):  
Lubomir Hujo ◽  
Jozef Nosian ◽  
Marcin Zastempowski ◽  
Jan Kosiba ◽  
Jerzy Kaszkowiak ◽  
...  
Keyword(s):  
Physical Properties ◽  
Present Article ◽  
Water Concentration ◽  
Hydraulic Fluid ◽  
Efficiency Change ◽  
Hydraulic Pump ◽  
Laboratory Conditions ◽  
A Value ◽  
Operating Load ◽  
Agricultural Tractors

The present article deals with the physical properties monitoring of the transmission-hydraulic fluid, and changes of those properties due the operating load of the hydraulic pump in laboratory conditions. Tests of the transmission-hydraulic fluid were performed in laboratory conditions with the simulation of the operating load, so as to simulate the real conditions under which hydraulic circuit of the agricultural tractors operates. The universal transmission-hydraulic fluid was subjected to analysis, where the samples of the fluid were taken sequentially according to the chosen methodology at intervals of 250 and 500 h. The results of the present article include the evaluation of the physical properties of the fluid and the flow efficiency change of the hydraulic pump after 250 and 500 h of operation, while simulating the operation load. Based on a laboratory test, we found that after working for 500 h, the dynamic viscosity of the examined hydraulic fluid at 40°C decreased by 2.92 mPa.s and at 100°C decreased by 0.64 mPa.s. When determining the kinematic viscosity of the hydraulic fluid after working for 500 h, we recorded its decrease, namely, at a temperature of 40°C by a value of 3.37 mm2/s and at a temperature of 100°C, its value decreased by 0.77 mm2/s. In the analysis of the test oil samples, we found that the level of water contamination of the hydraulic fluid decreases with increasing number of hours worked. Specifically, the water concentration in the hydraulic fluid decreased by 0.031%. At the same time, we recorded a slight decrease in the flow efficiency of the hydraulic pump, specifically by a value of 0.03% after 500 h worked. After working 500 h, we found that the range of abrasion particles in the transmission-hydraulic fluid is within the prescribed range, which is determined by the standard D6595-00.

scholarly journals Research of characteristics of environmental energy carriers by simulation of operating load in laboratory conditions

2019 ◽  
Vol 302 ◽  
pp. 01006
Author(s):  
Romana Janouskova ◽  
Jerzy Kaszkowiak ◽  
Marek Halenar ◽  
Martin Zachar ◽  
Jozef Nosian
Keyword(s):  
Laboratory Research ◽  
Hydraulic Fluid ◽  
Laboratory Setting ◽  
Energy Carriers ◽  
Laboratory Conditions ◽  
Physico Chemical ◽  
Operational Load ◽  
Operating Load ◽  
Transmission Fluid ◽  
Agricultural Tractors

The focus of this sceintific article is a laboratory research on the qualities of environmental energy carriers by simulating the operational load, focusing on changes of physico-chemical qualities of ecological hydraulic and transmission fluid used in agricultural tractors. In laboratory setting by using a simulator, it was possible to simulate different operational load and also track changes in qualities of hydraulic fluid by changing the flow in precise intervals. The hydraulic-transmission fluid used in the laboratory setting was the MOL Farm NH Ultra.

scholarly journals Simulation of hydraulic pump load in laboratory conditions

2021 ◽  
Vol 351 ◽  
pp. 01005
Author(s):  
Ľubomír Hujo ◽  
Romana Janoušková ◽  
Štefan Čorňák ◽  
Juraj Tulík
Keyword(s):  
Laboratory Test ◽  
Working Hours ◽  
Hydraulic Fluid ◽  
Agricultural Machinery ◽  
Hydraulic Pump ◽  
Scientific Contribution ◽  
Energy Carriers ◽  
Laboratory Conditions ◽  
Limit Test ◽  
The Impact

The aim of the scientific contribution is simulating the load of gear hydraulic pump used in agricultural machinery in laboratory conditions, where the impact of ecological transmission-hydraulic fluid on life limit (flow and efficiency) of gear hydraulic pump GHD1-17R is monitored. Laboratory test equipment was used for the simulation. The equipment was used to perform life limit test of hydraulic pump and to monitor changes in physicochemical ecological energy carriers. The simulation in laboratory conditions took 500 hours. The Vickers test took 100 hours. Transmission-hydraulic fluid MOL Farm NH Ultra was used for simulation. The results were that fluid is appropriate to use in this type of hydraulic pump in agricultural machineries. According to the Vickers test, the fluid is characterized by an increased value of flow and efficiency after 50 working hours, thereby exceeding the specified test values.

Hydraulic Laboratory Devices for Testing of Hydraulic Pumps

2014 ◽  
Vol 1059 ◽  
pp. 111-117
Author(s):  
Zdenko Tkáč ◽  
Ján Kosiba ◽  
Ľubomír Hujo ◽  
Daniela Uhrinová ◽  
Ivan Štulajter
Keyword(s):  
Laboratory Test ◽  
Laboratory Tests ◽  
Flow Characteristics ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Negative Effects ◽  
Operational Conditions ◽  
Pump Flow ◽  
Agricultural Tractors ◽  
Hydraulic Circuits

Hydraulic pumps are the most important components of hydraulic circuits in agricultural tractors. Their durability is influenced by flow characteristics and thus the flow efficiency. This paper presents the laboratory test of an ecological synthetic hydraulic fluid of UTTO type. This fluid is currently under development. In terms of a decrease in hydraulic pump flow efficiency, laboratory tests of these fluids did not show negative effects of its application. It can be stated that after completion of laboratory tests, it will be needed to continue with trials under operational conditions.

Monopropellant-Driven Free Piston Hydraulic Pump for Mobile Robotic Systems

2004 ◽  
Vol 126 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Timothy G. McGee ◽  
Justin W. Raade ◽  
H. Kazerooni
Keyword(s):  
Hydrogen Peroxide ◽  
High Temperature ◽  
Thermodynamic Analysis ◽  
Flow Rate ◽  
Power Supply ◽  
Robotic Systems ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Free Piston

The authors present a novel power supply for mobile robotic systems. A monopropellant (e.g., hydrogen peroxide) decomposes into high temperature gases, which drive a free piston hydraulic pump (FPHP). The elimination of fuel/oxidizer mixing allows the design of simple, lightweight systems capable of operation in oxygen free environments. A thermodynamic analysis has been performed, and an experimental FPHP has been built and tested. The prototype successfully pumped hydraulic fluid, although the flow rate was limited by the off-the-shelf components used.

scholarly journals On the measurement of the dielectric constants of liquids, with a determination of the dielectric constant of benzene

1929 ◽  
Vol 123 (792) ◽  
pp. 664-685 ◽  
Keyword(s):  
Dielectric Constant ◽  
Physical Properties ◽  
Dielectric Constants ◽  
Experimental Conditions ◽  
The Past ◽  
A Value ◽  
The Subject ◽  
Important Indication

It has long been recognised that the dielectric constant of a substance gives an important indication of its constitution, and the classical papers of Nernst and Drude giving methods for the determination of dielectric constants, have been followed by a long series of papers giving the dielectric constants of several hundreds of pure liquids and solutions. Since the publication of Debye’s dipole theory in 1912, the literature of the subject has become even more voluminous than before. In surveying the mass of data one is struck by the very large discrepancies which exist in the values obtained by different observers for any one substance, and it is very difficult to decide whether they are due to the difficulty of pre­paring and purifying the substance, differences in experimental conditions such as frequency of the applied E. M. F., or errors in the methods of measure­ment. In order to make it possible to compare the results of different observers, and to provide a fundamental basis for new measurements, it is important that the value of at least one standard liquid should be known with unquestion­able accuracy. The object of the present investigation was to provide such a value. Benzene was chosen as the standard liquid since it has been very widely used in the past, and it is used as a standard in the measurement of other physical properties.

Robust Control of a New Electro-Hydraulic Pump for Agricultural Tractors

2011 ◽  
Vol 44 (1) ◽  
pp. 2266-2271 ◽  
Author(s):  
Pandeli Borodani ◽  
Davide Colombo ◽  
Marco Forestello ◽  
Riccardo Morselli ◽  
Patrizio Turco
Keyword(s):  
Robust Control ◽  
Hydraulic Pump ◽  
Agricultural Tractors

scholarly journals Bulkhead Door – Critical Evacuation States

2017 ◽  
Vol 24 (1) ◽  
pp. 66-71 ◽  
Author(s):  
Józef Flizikowski ◽  
Weronika Kruszelnicka ◽  
Mirosław Michałowski ◽  
Grzegorz Szala ◽  
Andrzej Tomporowski
Keyword(s):  
Present Article ◽  
Hydraulic System ◽  
Hydraulic Fluid ◽  
Critical States ◽  
High Level

Abstract The article is a preliminary to a modification concept of the sliding watertight bulkhead door used on ships and vessels. Hydraulic or electro-hydraulic drives used to move these doors require complicated and extended pressure installations with large amounts of hydraulic fluid. Well-known operational drawbacks of these installations include high level of noise and possibility of various leaks in the hydraulic system. Being the first in a series, the present article describes and analyses critical states which can take place during evacuation of people through openings in the watertight bulkhead doors on seagoing ships and vessels.

The role of storytelling in building a brand

2017 ◽  
Vol 18 (3) ◽  
pp. 0-0 ◽  
Author(s):  
Magdalena Hofman-Kohlmeyer
Keyword(s):  
Literature Review ◽  
Present Article ◽  
Positive Emotions ◽  
First Person ◽  
Sense Of Humor ◽  
A Value ◽  
Unique Association

Nowadays, storytelling is a well-known tool used in process of building a brand. Despite of popularity of corporates’ stories, the elements a good brand story and condition under which story creates a value of a brand remains unclear. The present article is aimed to give an outlook on the role of storytelling in building a brand and how to design a good brand story. This paper is based on literature review. The analysis of polish and foreign surveys reveal that brand story rises positive emotions, unique association and better assessment to a brand. Researchers listed various elements that comprised a good brand story, e.g. authenticity, benefits, first-person narrator, sense of humor. Storytelling gives opportunity

Some physical properties that affect the rate of diffusion of oxygen into silage

1983 ◽  
Vol 100 (3) ◽  
pp. 601-605 ◽  
Author(s):  
D. V. H. Rees ◽  
E. Audsley ◽  
M. A. Neale
Keyword(s):  
Carbon Dioxide ◽  
Physical Properties ◽  
Laboratory Conditions

SUMMARYExperiments are described which study the effect of density and chop length on the rate of diffusion of oxygen into silage and equations are presented which enable the rate of diffusion to be calculated under laboratory conditions. The concept of zero porosity is also discussed and methods of calculating the density at which it occurs are given. The effect of carbon dioxide on the rate of diffusion is also discussed.

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