Hydraulics. Workshop

2020 ◽  
Author(s):  
Sergey Vol'vak
Keyword(s):  
Land Reclamation ◽  
Hydraulic Drive ◽  
Hydraulic Transport ◽  
Agricultural Water ◽  
Technical Problems ◽  
Positive Displacement ◽  
Dynamic Type ◽  
Hydraulic Machines ◽  
Agricultural Water Supply

Study guide corresponds to the program discipline "Hydraulics". Consists of two parts and is for carrying out practical and laboratory works. The first part provides material on the basics of the calculation of hydraulic machines, hydraulic drives of agricultural machinery, systems of land reclamation and hydraulic transport for development of skills of application of theoretical information to solve specific technical problems and development practices of hydraulic calculations. The second part contains material for the study of the methods and instruments for measuring pressure, the study of the equation of Bernoulli, determination of hydraulic resistance, the study of the structure and principles of operation of positive displacement pumps and dynamic-type, cylinders, volumetric hydraulic drive and hydrodynamic transmission elements and schemes of irrigation systems and agricultural water supply. To conduct practical and laboratory classes for students of all forms of training in the direction of training 35.03.06 "Agroengineering", as well as for graduate students, teachers and technical workers of agriculture.

Hydraulics

2020 ◽  
Author(s):  
Sergey Vol'vak
Keyword(s):  
Graduate Students ◽  
Water Supply ◽  
Hydraulic Drive ◽  
Study Guide ◽  
Agricultural Water ◽  
Field Of Study ◽  
Hydraulic Machines ◽  
Agricultural Water Supply

Study guide corresponds to the program discipline "Hydraulics" and consists of two parts: "Hydraulics and hydraulic machines" and "the Dredging of agricultural processes". This course focuses on the theory of hydraulics, design and operation of hydraulic machines, fans, compressors and other means of dredging of agricultural processes, provides information about the hydraulic drive, the basics of reclamation and mechanized irrigation and agricultural water supply, data on hydropneumatische in agriculture. For students of all forms of education in field of study 35.03.06 "Agroengineering", as well as for graduate students, teachers and technical workers of agriculture.

scholarly journals Stochastic models for ensuring parametric reliability of the construction machines

2021 ◽  
pp. 262-273
Author(s):  
Galyna Getun ◽  
Vitalii Les'ko ◽  
Iryna Bezklubenko ◽  
Olena Balina ◽  
Yurii Butsenko
Keyword(s):  
Methodological Approach ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Technical Condition ◽  
Technical Problems ◽  
Reliability Models ◽  
Reliability Indicators ◽  
Hydraulic Machines ◽  
Parametric Reliability ◽  
Analysis Of Failures

The solution of technical problems to ensure the working capacity is largely determined by the effectiveness of theoretical and applied developments in an area of estimation and prediction of their reliability indicators. An effective approach to the analysis of failures and the development of operability and parametric reliability models provides an opportunity to obtain more adequate models of reliability of hydraulic drives of machines, as they more fully take into account the specifics of the structure and functioning of the hydro drive elements of construction machines, their relationships and features of the formation of parameters failures. And this will allow to get more real and accurate results of estimation of reliability indicators of hydraulic drives of both construction and other hydraulic machines. They do not exhaust all possible variants of models that can take place when analyzing the reliability of hydraulic drives of machines, but at the same time they to a certain extent extend and refine the set of known reliability models. Specific in terms of formation of parametrical failures are such consistently connected in terms of the layout of hydraulic elements, as working sections of hydraulic distributors and hydraulic cylinders, which are part of the subsystems of GPs and form the so-called functional areas (FA). Reaching the FA limit is a compatible result of the combined random process of evolution of the volumetric efficiency JCUA  these elements, and the technical condition of the FA is estimated to be generalized by the JCUA, which equals the product of the JCUA of consecutively connected elements: . In this case, the probability of maintaining the capacity of the FA will be: . The processing of diagnostic information and the study of the reliability of GPs in real conditions of their operation showed that the distribution of JCUD hydraulic elements with a sufficient degree of consistency can be described under several theoretical laws. It is considered when the JCUA sections of the hydraulic distributor and hydraulic cylinder are distributed by gamma distribution and exponential distribution. The use of the general methodological approach to the analysis of failures and the construction of models of operability and parametric reliability provides an opportunity to obtain more adequate models of reliability of hydraulic drives of machines, as they more fully take into account the specifics of the structure and functioning of the hydraulic drive elements, They don't exhaust all possible models that can take place when analyzing the reliability of hydraulic drives, but at the same time they are to some extent expanding and refining the range of already known models of reliability.

scholarly journals Structural optimization of the hydraulic drive of a mobile transport and reloading rope complex based on pareto-optimal solutions

2020 ◽  
Vol 6 (4) ◽  
pp. 506-517
Author(s):  
V.I. Tarichko ◽  
Keyword(s):  
Structural Optimization ◽  
Hydraulic Drive ◽  
Specific Power ◽  
Pareto Optimal ◽  
Pareto Optimal Solutions ◽  
Optimal Solutions ◽  
Positive Displacement ◽  
Hydraulic Machines ◽  
Difficult Terrain ◽  
Rapid Deployment

The article proposes a method of structural optimization of the hydraulic drive of mobile transport and reloading rope complexes based on special multi-axle chassis with increased carrying capacity and cross-country ability. At present, this type of technological machines can be considered as a new class of technological overground transport vehicles, which is an effective alternative to stationary freight ropeways for hard-to-reach areas with difficult terrain and, if necessary, the rapid deployment of transport and logistics operations. An algorithm for the formation of the Pareto set is considered, which consists of a variety of alternative versions of the hydraulic drive based on a combination of positive displacement pumps and hydraulic motors of permissible standard sizes. A criterion for choosing the Pareto-optimal solutions of the designed hydraulic drive is proposed, based on three quality indicators — the total mass of the hydraulic machines, the specific power and the efficiency of the hydraulic drive.

scholarly journals Standard costs for land reclamation systems operation in the Republic of Sakha (Yakutia)

2021 ◽  
Author(s):  
G. I. Dayanova ◽  
◽  
L. D. Protopopova ◽  
M. I. Loskin ◽  
I. K. Egorova ◽  
...  
Keyword(s):  
Water Supply ◽  
Public Services ◽  
Land Reclamation ◽  
The State ◽  
Agricultural Water ◽  
Safe Operation ◽  
Water Pipelines ◽  
Group Water ◽  
Agricultural Water Supply ◽  
The Republic

Purpose: to determine the costs for fulfilling the state task on efficient and safe operation of reclamation systems, agricultural water supply facilities and hydraulic structures of the Republic of Sakha (Yakutia). Materials and methods: the research was carried out at the facilities of the state budgetary institution “Department for Land Reclamation and Agricultural Water Supply of the Ministry of Agriculture of the Republic of Sakha (Yakutia)”. The calculation of standard costs was made using the method of initial cost standards based on local estimates. Results. This work takes into account the standard costs attributed to the provision of public services (work performance), for general needs and for the maintenance of property. The basic standard costs for service, maintenance of the reclamation systems in good working order in 2021 amounted to 6.5 thousand rubles/ha, for agricultural water supply facilities – 1677.7 thousand rubles/unit, to determine the needs and to participate in water resources distribution (group water pipelines) – 25348.1 thousand rubles/million m³. Conclusion. The given calculation method can be used to calculate the financing for the fulfillment of a state task, it will make it possible to make economically justified calculations of the costs of public services deliveries for the efficient and safe operation of reclamation systems, agricultural water supply facilities and group water pipelines of the Republic of Sakha (Yakutia) and, as a result, to ensure the improvement of the organization labor, improving production performance.

Study on Calculation Methods of Agricultural Water Supply Cost in the Plain Irrigation Area of the Yellow River

2012 ◽  
Vol 212-213 ◽  
pp. 498-501
Author(s):  
Rui Guo ◽  
Sheng Le Cao
Keyword(s):  
Water Supply ◽  
Yellow River ◽  
Water Pricing ◽  
Water Price ◽  
The Yellow River ◽  
Agricultural Water ◽  
Calculation Methods ◽  
Irrigation Area ◽  
Agricultural Water Supply

Scientific and reasonable water price is the foundation of beneficial operation of water supply project, and water pricing is on the basis of per cubic meter water supply cost. According to characteristics of water supply project in the plain irrigation area of the Yellow River, a research on calculation methods of agricultural water supply cost is made. Calculation formulas of project lines are put forward and an example was given.

LAND RECLAMATION OF AGRICULTURAL LAND IN THE REPUBLIC OF SAKHA (YAKUTIA) IN THE CONDITIONS OF CLIMATE CHANGE

2021 ◽  
pp. 14-20
Author(s):  
M. I. LOSKIN ◽  
Keyword(s):  
Climate Change ◽  
Water Supply ◽  
Agricultural Land ◽  
Land Reclamation ◽  
Rural Settlements ◽  
Water Pipelines ◽  
Group Water ◽  
Agricultural Water Supply ◽  
The Republic ◽  
The Impact

The current state of agricultural land reclamation in the Republic of Sakha (Yakutia), its role in agricultural production of the republic, taking into account the impact of climate change on irrigation facilities, is considered. It has been established that at present in the sphere of public administration in the field of land reclamation in the republic there are estuary irrigation systems, drainage systems and agricultural water supply facilities, as well as group water pipelines for water supply of rural settlements and irrigation of agricultural land.

scholarly journals The method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning executive elements

2018 ◽  
Vol 226 ◽  
pp. 04024
Author(s):  
Valeriy V. Grechikhin ◽  
Galina A. Galka ◽  
Anatoliy I. Ozerskiy ◽  
Mikhail E. Shoshiashvili
Keyword(s):  
Mutual Influence ◽  
Hydraulic Drive ◽  
Joint Work ◽  
Operating Modes ◽  
Hydraulic Machines ◽  
Dynamic Operating ◽  
Electrohydraulic Drive ◽  
Drive Systems ◽  
Improved Accuracy ◽  
Executive Elements

The article describes the method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning output element. The method is the evolution of the fundamental positions of the mechanics of continuous media with moving boundaries as applied to the research of non-stationary processes accompanying the operation of hydraulic drive systems with piston hydraulic machines. The method is based on generalized modeling (technical, physical, mathematical and computer), takes into account the peculiarities of mutual influence of electric and hydraulic machines during their joint work as part of the electrohydraulic drive, which raises the level and adequacy of actuators simulation, as well as the reliability of the assessment of their technical condition. The method extends the field of research, improves the accuracy of the calculation of the positioning of the executive elements, taking into account the different dynamic modes of the drives under study.

scholarly journals Theoretical background of hydraulic drive control system analysis for testing piston hydraulic cylinders

2019 ◽  
Vol 19 (3) ◽  
pp. 242-249 ◽  
Author(s):  
A. T. Rybak ◽  
I. K. Tsybriy ◽  
S. V. Nosachev ◽  
A. R. Zenin
Keyword(s):  
Mathematical Modeling ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Test Bench ◽  
Hydraulic Drive ◽  
Mechanical Transmission ◽  
Hydraulic Motor ◽  
Hydraulic Machines ◽  
Life Tests ◽  
Hydraulic Cylinders

Introduction. The durability and performance of hydraulic machines is determined through life tests. At that, various braking devices (mechanical, electric, hydraulic, etc.) are used for strength loading of the hydraulic motor, as a result of which a significant amount of energy is lost. This can be avoided if the method of rotational motion with energy recovery is used during life tests. This approach is applicable for hydraulic pumps, motors, and hydraulic cylinders.Materials and Methods. A test bench is presented, the design of which provides recreation of the conditions most appropriate for the field operation of hydraulic cylinders. In this case, energy recovery is possible. To solve the research problems, methods of mathematical modeling were used, the basic functional parameters of the proposed design were calculated. The determination of the pressure increment at various points in the hydraulic system is based on the theory of volumetric rigidity. When modeling the motion of the moving elements of the bench hydraulic system, the laws of rotor motion are used.Research Results. In the structure of the test bench, the cylinders in question are located in the pressure main between the hydraulic pump and the hydraulic motor. This enables to significantly reduce the bench itself and to save a significant amount of energy due to its recovery. A basic hydraulic diagram of the test bench for piston hydraulic cylinders is presented, in which the operation of the moving elements of the system is shown. A mathematical modeling of the hydraulic system of the bench is performed. A kinematic diagram of the mechanism for transmitting motion between test cylinders is shown.Discussion and Conclusions. The system of equations presented in the paper shows how the increment of pressure at the selected nodal points of the energy recovery system is determined (in particular, how the increment depends on time, reduced coefficient of volumetric rigidity, operating fluid consumption, and piston areas). The velocities of the hydraulic pistons are determined according to the kinematic scheme of the mechanical transmission of the bench. Thus it can be argued that, thanks to the solution presented in the paper, the life test results of hydraulic cylinders will adequately reflect their operation under rated duties.

Square Wave Adsorptive Stripping Voltammetry Determination of Chlorpyriphos in Irrigation Agricultural Water

2018 ◽  
Vol 73 (7) ◽  
pp. 695-704 ◽  
Author(s):  
Luisa C. Melo ◽  
Murilo S. S. Julião ◽  
Maria A. L. Milhome ◽  
Ronaldo F. do Nascimento ◽  
Djenaine De Souza ◽  
...  
Keyword(s):  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Agricultural Water ◽  
Square Wave
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