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

2021 ◽  
Vol 338 ◽  
pp. 01010
Author(s):  
Ľubomír Hujo ◽  
Juraj Jablonický ◽  
Sylwester Borowski ◽  
Jerzy Kaszkowiak ◽  
Matej Michalides
Keyword(s):  
Laboratory Test ◽  
Physical Properties ◽  
Hydraulic System ◽  
Flow Characteristics ◽  
Operating Conditions ◽  
Test Equipment ◽  
Working Fluid ◽  
Maximum Pressure ◽  
Hydraulic Pump ◽  
Data Set

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.

Calculation of a closed hydraulic volumetric system

2021 ◽  
pp. 27-30
Author(s):  
Keyword(s):  
Power Plant ◽  
Wind Power ◽  
Hydraulic System ◽  
Working Fluid ◽  
Wind Power Plant ◽  
Hydraulic Systems ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Oil Pump ◽  
Selection Of

An algorithm is proposed for calculating a closed volumetric hydraulic pump-hydraulic motor system using the example of the hydraulic system of a wind power plant, based on the calculation of the hydraulic systems of mobile machines. The main characteristics of the system components, the selection of initial data for the calculation, working fluid and diameters of hydraulic lines are analyzed. Keywords: hydraulic system, energy, fluid, oil, pump, motor, renewable energy source, wind power plant, machine. [email protected]

scholarly journals Symbolic Important Point Perceptually and Hidden Markov Model Based Hydraulic Pump Fault Diagnosis Method

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4460 ◽  
Author(s):  
Yunzhao Jia ◽  
Minqiang Xu ◽  
Rixin Wang
Keyword(s):  
Fault Diagnosis ◽  
Markov Model ◽  
Hidden Markov Model ◽  
Hydraulic System ◽  
Hidden Markov ◽  
Operating Conditions ◽  
Fault Classification ◽  
Hydraulic Pump ◽  
Diagnosis Method ◽  
Original Time

Hydraulic pump is a driving device of the hydraulic system, always working under harsh operating conditions, its fault diagnosis work is necessary for the smooth running of a hydraulic system. However, it is difficult to collect sufficient status information in practical operating processes. In order to achieve fault diagnosis with poor information, a novel fault diagnosis method that is the based on Symbolic Perceptually Important Point (SPIP) and Hidden Markov Model (HMM) is proposed. Perceptually important point technology is firstly imported into rotating machine fault diagnosis; it is applied to compress the original time-series into PIP series, which can depict the overall movement shape of original time series. The PIP series is transformed into symbolic series that will serve as feature series for HMM, Genetic Algorithm is used to optimize the symbolic space partition scheme. The Hidden Markov Model is then employed for fault classification. An experiment involves four operating conditions is applied to validate the proposed method. The results show that the fault classification accuracy of the proposed method reaches 99.625% when each testing sample only containing 250 points and the signal duration is 0.025 s. The proposed method could achieve good performance under poor information conditions.

Analysis of Microheat Pipes With Axial Conduction in the Solid Wall

2010 ◽  
Vol 132 (7) ◽  
Author(s):  
Yew Mun Hung ◽  
Kek-Kiong Tio
Keyword(s):  
Temperature Distribution ◽  
Heat Transport ◽  
Thermal Effects ◽  
Solid Wall ◽  
Flow Characteristics ◽  
Operating Conditions ◽  
Working Fluid ◽  
Transport Capacity ◽  
Axial Temperature ◽  
Energy Equations

A one-dimensional, steady-state model of a triangular microheat pipe (MHP) is developed, with the main purpose of investigating the thermal effects of the solid wall on the heat transport capacity of an MHP. The energy equation of the solid wall is solved analytically to obtain the axial temperature distribution, the average of which over the entire length of the MHP is simply its operating temperature. Next, the liquid phase is coupled with the solid wall by a heat transfer coefficient. Then, the continuity, momentum, and energy equations of the liquid and vapor phases are, together with the Young–Laplace equation, solved numerically to yield the heat and fluid flow characteristics of the MHP. The heat transport capacity and the associated optimal charge level of the working fluid are predicted for different operating conditions. Comparison between the models with and without a solid wall reveals that the presence of the solid wall induces a change in the phase change heat transport by the working fluid, besides facilitating axial heat conduction in the solid wall. The analysis also highlights the effects of the thickness and thermal conductivity of the solid wall on its axial temperature distribution. Finally, while the contribution of the thermal effects of the solid wall on the heat transport capacity of the MHP is usually not dominant, it is, nevertheless, not negligible either.

scholarly journals LOW TEMPERATURES EFFECT ON THERMAL CONDITIONS OF DZ-98 AUTOGRADER HYDRAULIC UNITS

2020 ◽  
Vol 17 (3) ◽  
pp. 316-327
Author(s):  
T. N. Okhlopkov
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
Ambient Temperature ◽  
Thermal Regime ◽  
Low Temperatures ◽  
Hydraulic System ◽  
Operating Conditions ◽  
Working Fluid ◽  
Climatic Data ◽  
Joint Stock Company

Introduction. The article discusses the climatic conditions of Yakutia, as well as the cooling process of the hydraulic system of DZ-98 motor grader in order to prevent violation of the thermal regime of hydraulic units under the influence of low temperatures, taking into account the wind blowing and operating conditions. The surface temperature of the hydraulic units was measured on January 16, 2018 in the city of Yakutsk on the basis of Yakutdorstroi joint-stock company at an ambient temperature of -42 ° С.Materials and methods. To ensure a reliable operation of the hydraulic system at low temperatures, hydraulic units must provide a supply of working fluid under pressure, regardless of changes in ambient temperature. The thermal regime of hydraulic units is characterized by three main parameters: pressure, temperature and volume. In the North, where the ambient winter temperature varies from -27 ° С to -49 ° С, the absolute temperature is the determining parameter. Studying the problem, theories of heat conduction and heat transfer in solids, hydrodynamics, and differential equations were used.Results. Natural and climatic data, as well as the recorded surface temperature of hydraulic units, allow to determine the number of days with a critically negative temperature, the heat transfer of hydraulic units and the regularity of its change depending on the operating mode.

scholarly journals Design of Laboratory Test Equipment for Automotive Oil Filters to Evaluate the Technical Life of Engine Oil

2021 ◽  
Vol 11 (2) ◽  
pp. 483
Author(s):  
Hujo Ľubomír ◽  
Jablonický Juraj ◽  
Markovič Jaromír ◽  
Tulík Juraj ◽  
Simikić Mirko ◽  
...  
Keyword(s):  
Laboratory Test ◽  
Operating Conditions ◽  
Test Equipment ◽  
Engine Oil ◽  
Laboratory Measurements ◽  
Laboratory Equipment ◽  
Engine Oils ◽  
Simultaneous Testing ◽  
Motor Oils ◽  
Filtration Capacity

The main aim of the article is to present the design of laboratory test equipment, which is appropriate for monitoring the efficiency of oil filters and the system for evaluating the technical life of engine oils in terms of possible extension of service intervals. The functionality of the designed laboratory test equipment for the filtration of motor oils was verified by a practical experiment with a verification measurement and assessment of the suitability of the hydraulic circuit elements and the designed sensing equipment. The laboratory equipment enables the testing of oil filters with different filtration capacity during simultaneous testing in two separate hydraulic circuits with differently contaminated engine oil, while it enables laboratory measurements to be performed while simulating operating conditions.

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.

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

2021 ◽  
Vol 11 (18) ◽  
pp. 8435
Author(s):  
Ľubomír Hujo ◽  
Juraj Jablonický ◽  
Juraj Tulík ◽  
Ján Kosiba ◽  
Jerzy Kaszkowiak ◽  
...  
Keyword(s):  
Laboratory Test ◽  
Physicochemical Properties ◽  
Motor Vehicle ◽  
Operating Conditions ◽  
Test Equipment ◽  
Engine Oil ◽  
Oil Contamination ◽  
Testing Time ◽  
Test Circuit ◽  
Technical Properties

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.

scholarly journals Evaluation of tractor biodegradable hydraulic fluids on the basis of hydraulic pump wear

2013 ◽  
Vol 59 (No. 3) ◽  
pp. 75-82 ◽  
Author(s):  
R. Majdan ◽  
Z. Tkáč ◽  
J. Kosiba ◽  
R. Abrahám ◽  
J. Jablonický ◽  
...  
Keyword(s):  
Test Bench ◽  
Flow Characteristics ◽  
Mineral Oil ◽  
Operating Conditions ◽  
Hydraulic Fluid ◽  
Test Results ◽  
Hydraulic Pump ◽  
Cyclic Pressure ◽  
Hydraulic Fluids ◽  
Evaluation Parameters

Two types of biodegradable hydraulic fluids (HEES and HEPR) with the mineral oil-based hydraulic fluid (HV) were compared. The tests were performed using a test bench. During the tests with a tractor hydraulic pump, the fluids were loaded by a cyclic pressure load. The tests of fluids were evaluated on the basis of wear of the pump. Evaluation parameters were the flow characteristics of the pump and the cleanliness level of tested fluids. The temperature of the fluid under which the test was performed was measured in real operating conditions of the Zetor Forterra 11441 tractor. It is possible to state upon the test results that the mineral oil-based fluid was classified in the first place, the biodegradable fluid of the HEPR type in the second place, and the biodegradable fluid of the HEES type received the last position.  

Research and Exploration of Waste Money Drilling Technology

2012 ◽  
Vol 424-425 ◽  
pp. 912-915
Author(s):  
Xian Chun Cheng ◽  
Qiu Lei Du
Keyword(s):  
Hydraulic System ◽  
Production Efficiency ◽  
Flow Characteristics ◽  
Structure Design ◽  
Hydraulic Pump ◽  
Drilling Technology ◽  
Box Structure ◽  
Design Mechanism ◽  
Rotary Speed ◽  
Improve Production Efficiency

According to the drilling of thick paper, this paper has studied the design mechanism and principles of waste money drilling machine. It mainly studies the technological process, thick paper processing drill, rotary speed and cutting force and other experiments; It also researches the orientation of "waste money"— clamping institutions, spindle box structure design; Because this design is mainly used for mass production and a large number of drilling, we should choose durable power source, and as a result, hydraulic system was chosen, Then we study the principle and system design of hydraulic system, select various valve bodies according to the hydraulic pump flow characteristics, so as to complete the feeding and clamping action of hydraulic system. Recycling waste money may save resources. Compared with previous piercing, waste money drilling processing not only reduce noise and improve production efficiency, but also reduce labor intensity, and is very favorable, beneficial to security of the processing, the check and environmental protection.

scholarly journals Design of Laboratory Test Equipment for Testing the Hydrostatic Transducers

2021 ◽  
Vol 24 (1) ◽  
pp. 35-40
Author(s):  
Jozef Nosian ◽  
Ľubomír Hujo ◽  
Marcin Zastempowski ◽  
Romana Janoušková
Keyword(s):  
Laboratory Test ◽  
Flow Rate ◽  
Operating Conditions ◽  
Test Equipment ◽  
Testing Time ◽  
Economic Costs ◽  
Simultaneous Observation ◽  
Hydraulic Fluids ◽  
Different Types ◽  
Basic Parameters

AbstractThe article presented describes a new design of measuring chains in laboratory test equipment, which are used for testing the hydrostatic transducers and hydraulic fluids. Laboratory test equipment allows simultaneous observation of parameters of hydrostatic transducers and hydraulic fluids by simulating the operating conditions under laboratory conditions, what can significantly reduce the testing time and economic costs. The new design functionality was verified via measurement of the basic parameters of hydrostatic transducers and changing the load of hydraulic fluids. Based on the results measured, the flow efficiency of tested hydrostatic transducer UD-25R was calculated and compared with the transducer parameters specified by the manufacturer using different types of operating hydraulic fluids. Verification measurements of the unloaded hydrostatic transducer were performed at various rotation speeds: Q250 = 5.694 dm3·rpm at speed of n1 = 250 rpm; Q500 = 12.286 dm3·rpm at speed of n2 = 500 rpm; Q750 = 18.747 dm3·rpm at speed of n3 = 750 rpm. Based on the hydrostatic transducer flow rate, the UD-25R transducer flow efficiency was determined: at n1 = 250 rpm, the flow efficiency was η250 = 0.8946; at n2 = 500 rpm, the efficiency was η500 = 0.9651; at n3 = 750 rpm, the flow efficiency was η750 = 0.9812.

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