Evaluation of Hydraulic Resistance in Various Liquids and Temperature

Kopiláková, B.; Turza, J.; Hujo, Ľubomír; Kosiba, Ján

doi:10.24874/ti.2017.39.01.14

Cited by 13 publications

(9 citation statements)

References 11 publications

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“…The laboratory test equipment made it possible to simulate the variable test conditions to simulate the real conditions under which the hydraulic system of the agricultural tractor operates. The analysis of working fluids in has already been dealt with by the authors [15] and [1]. According to the author [8] it is important to monitor the outflow of hydraulic fluid to the hydraulic circuit.…”

Section: Discussionmentioning

confidence: 99%

Measurement of flow characteristics of a gear hydraulic pump by simulating the operating load of the tractor’s hydraulic system

et al. 2021

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The results of the work include research on changes in flow characteristics of gear hydraulic pump QHD 17 by simulating operating conditions on laboratory test equipment with assessment of influence of transmission-hydraulic fluid MOL Farm NH Ultra on technical and operational properties of hydraulic pump QHD 17. The laboratory test equipment makes it possible to repeatedly simulate real conditions under which the hydraulic system of the agricultural tractor operates, or to simulate the load with maximum pressure. By monitoring the change in the flow of the hydraulic pump at precisely determined intervals, which were 0 and 125 hours worked, the influence of the physical properties of the working fluid on the flow properties of the hydraulic pump was assessed and the measured data set was evaluated by mathematical-statistical analysis. Based on the physical properties of the tested MOL Farm NH Ultra fluid, which were determined from the samples taken at precisely determined intervals, no negative effect of the fluid itself as well as its properties on the flow efficiency of hydraulic pump QHD 17 was found.

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Section: Discussionmentioning

confidence: 99%

Measurement of flow characteristics of a gear hydraulic pump by simulating the operating load of the tractor’s hydraulic system

et al. 2021

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“…According to the authors [18][19][20][21], the basic precondition for the correct function and effective care of hydraulic fluids is a suitably chosen methodology for testing fluids with monitoring of the level of contamination of the working fluid. With an experimental set of pressure measurements with numerical simulation for engines in laboratory conditions, we reduce the time required to perform operational measurements [22].…”

Section: Discussionmentioning

confidence: 99%

Verification Measurement of Laboratory Test Equipment for Evaluation of Technical Properties of Automotive Oil Filters

et al. 2021

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By simulating the operating conditions, it is possible to verify and evaluate the technical properties of motor vehicle oil filters and the functionality of the designed equipment. Contaminated engine oil from operation was used with MANN W950/26 oil filter and a CNH Industrial 2992242 oil filter in the test circuit. Before use, the level of engine oil contamination in the test circuit was determined by evaluating the physicochemical properties. The laboratory test equipment also allows monitoring the technical life of oil filters, with variously contaminated engine oil, with the possibility of extending engine oil change service intervals depending on changes in the physicochemical properties of engine oil and filter efficiency. These laboratory tests can be performed in parallel in two hydraulic circuits, which can significantly reduce the testing time of the filter capabilities of oil filters, without the risk of engine damage, provided that the tests were performed under operating conditions. The results of the evaluation of the filtration capacity of oil filters can be used in the design of new filter materials, but also with a suitably determined methodology of oil filter replacement and engine oil change interval, it is possible to extend replacement intervals, which has a significant benefit not only from an economic but also ecological point of view. The result of the measurements is the confirmation of the functionality of the device with the possibility of simulating the operating conditions, at different degrees of oil contamination, at different operating temperatures and using different oil filters.

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“…Fluid deforms continuously while in operation and is subjected to shear stress regardless of particle size (Kosiba, 2016). According to Kopiláková (2017), when conducting liquid tests, temperature and pressure affect the measurements. Fluid samples were subjected to following laboratory tests: ferro-graphic analysis, acid number measurement, particle number determination and classification.…”

Section: Methodsmentioning

confidence: 99%

Analysis of Degradation of Ecological Transmission-Hydraulic Fluids Used in Agricultural and Forestry Machinery

Janoušková¹,

Nosian²,

Feriancová³

et al. 2020

Engineering Mechanics 2020

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In the scientific work we describe how ecological transmission-hydraulic fluid degrades during operation of agricultural and forestry machinery. We focused on investigating the physical-chemical properties of ecological transmission-hydraulic fluid. Measuring and sampling was performed under laboratory conditions, using a simulation device for testing transmission-hydraulic circuits in agricultural and forestry machinery.

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Evaluation of Hydraulic Resistance in Various Liquids and Temperature

Abstract: A B S T R A C T

Cited by 13 publications

References 11 publications

Measurement of flow characteristics of a gear hydraulic pump by simulating the operating load of the tractor’s hydraulic system

Measurement of flow characteristics of a gear hydraulic pump by simulating the operating load of the tractor’s hydraulic system

Verification Measurement of Laboratory Test Equipment for Evaluation of Technical Properties of Automotive Oil Filters

Analysis of Degradation of Ecological Transmission-Hydraulic Fluids Used in Agricultural and Forestry Machinery

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