Synchronization in multi-motor hydromechanical systems

Introduction. The paper submits the analysis of existing design solutions of flow dividers used to synchronize hydraulic drives of working bodies of technological and mobile machines. The market demands for multithreaded throttle flow dividers without valves with the controlled division ratio, such as multi-axle vehicle chassis, are identified. The objective of the work was to analyze the possibility and rationale for developing a throttle four-way flow divider without valves with sensing elements of the Venturi tube type. The solution should provide the synchronicity of movement (rotation) of more than three working bodies of technological and mobile machines.Materials and Methods. A patent search for the designs of hydraulic flow dividers is carried out, and systems that require the division of the hydraulic fluid flow into more than two executive bodies are considered. An upgrade option, which allows dividing the flow into four branches, is proposed for the design of a three-channel throttle flow divider without valves.Results. The urgency of developing a multithreaded throttle flow divider without valves for application in industrial and mobile machines is validated. Two types of four-flow dividers are considered, their weaknesses are indicated. It is noted that the development of a multithreaded throttle flow divider based on the designs created in 1989 and 1991 will reduce the number of hydraulic pumps and get rid of the series connection of double-flow dividers. In this way, it is possible to reduce pressure losses in the hydraulic system and implement adaptive control of hydraulic motors of multi-motor mobile machines. The possibility to obtain a divider/combiner into four flows by adding an outlet chamber connected to the membrane chamber through a channel entering the Venturi nozzle on the basis of a three-flow throttle divider is shown. The principle of operation of such equipment is described.Discussion and Conclusions. The principles of construction of throttle flow dividers without valves are considered. An upgrade option is proposed to increase the number of division channels from three to four. However, to validate the operability of this design, a numerical analysis of the various modes of operation of the divider is required — calculation of the reduced volumetric stiffness of its working cavities. The information obtained can be used to modernize the hydraulic units of technological and mobile machines, increase their reliability, manufacturability, and efficiency. The issues that need to be solved in further research are identified.

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Automated section for milling soil in near-trunk zones of orchard

E3S Web of Conferences ◽

10.1051/e3sconf/202016101068 ◽

2020 ◽

Vol 161 ◽

pp. 01068

Author(s):

Dmitriy Khort ◽

Rostislav Filippov ◽

Igor Smirnov ◽

Alexey Kutyrev ◽

Stepan Semichev

Keyword(s):

Theoretical Analysis ◽

Quality Indicators ◽

Hydraulic System ◽

Tracking System ◽

Fruit Trees ◽

Original Design ◽

Milling Cutter ◽

Working Bodies

Machines used in gardens do not fully comply with the quality indicators of tillage, especially in the near-trunk zones of fruit trees. Theoretical analysis made it possible to establish that the preferred protective distance in the aisle of the garden should be at least 0.20 m in each direction, and in the inter-barrel space of the boles along a row of 0.38 m and to establish the optimal width of the extension section of 0.55 m. As a result of the research, an original design of the deflectable milling section of the garden milling cutter with an autonomous hydraulic system was proposed and developed, as working bodies knives with special sharpening are used. The tracking system of the remote section is equipped with a double remote probe, when exposed to which the section is retracted to the required distance to protect the trunk of a tree. The use of a deflectable milling section of a garden milling cutter allows to increase the accuracy and quality indicators of processing in the near-trunk zones of garden plantings, while the density of the soil decreases on average by 24%.

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Tribological Film Formation in Hydraulic Motors

ASME/STLE 2011 Joint Tribology Conference ◽

10.1115/ijtc2011-61029 ◽

2011 ◽

Author(s):

Paul W. Michael ◽

Jeffrey M. Guevremont ◽

Mark T. Devlin ◽

Charles G. Ziemer

Keyword(s):

Hydraulic System ◽

Film Formation ◽

Phosphorus Level ◽

Energy Transformation ◽

X Ray ◽

Positive Displacement ◽

Hydraulic Motors ◽

System Temperature ◽

Tribological Films ◽

Boundary Films

This paper presents an investigation of the tribological films formed in hydraulic motors. Hydraulic motors convert the fluid power energy produced by positive displacement pumps into rotary motion. Earlier research found that the efficiency of this energy transformation can be enhanced by reducing boundary friction. In order to study the nature of the boundary films formed in an orbital motor, a prototype ashless hydraulic fluid was evaluated in a low-speed high-torque dynamometer. The resulting tribofilm was probed via Energy Dispersive X-Ray Spectroscopy. The results reveal that increasing the hydraulic system temperature raised the relative phosphorus level of the tribofilm.

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Justification of the Kinematic Diagrams for the Distribution System of a Planetary Hydraulic Motor

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.3.19544 ◽

2018 ◽

Vol 7 (4.3) ◽

pp. 6 ◽

Cited By ~ 10

Author(s):

Angela Voloshina ◽

Anatolii Panchenko ◽

Oleg Boltynskiy ◽

Igor Panchenko ◽

Olena Titova

Keyword(s):

Distribution System ◽

Hydraulic System ◽

Hydraulic Drive ◽

Fluid Distribution ◽

Working Fluid ◽

Hydraulic Motor ◽

Hydraulic Motors ◽

Output Characteristics ◽

Kinematic Diagram ◽

The Impact

The output characteristics of a planetary (orbital) hydraulic motor could be significantly improved if the kinematic diagrams for its working fluid distribution system are chosen correctly and substantiated. Fluctuations in the flow of the power fluid cause pulsation in the cavity of the input pressure of the hydraulic motor. This results to vibration of the hydraulic system elements. Thus, the hydraulic motor can be considered as a source of pulsation which leads to functional failures of the hydraulic system. As they run at low rotational speeds with high torque, planetary hydraulic motors are commonly applied for a hydraulic drive in active working tools of self-propelled machinery. It has been established that one of the main components of a planetary hydraulic motor, which causes pressure pulsations, is its distribution system. The frequency and amplitude of these pulsations depends on the kinematic diagram for the distribution system of the power fluid. Therefore, we studied how the kinematic diagram for the distribution system effects on the output characteristics of a planetary motor. Since the change in the capacity of a distribution system with various kinematic diagrams influences on the output characteristics of a planetary motor, the impact was investigated. The kinematic diagrams, which improve the output characteristics of planetary hydraulic motors, were justified.

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Improvement of technical means for processing waste from logging operations for fuel chips in felling conditions

10.12737/24135 ◽

2017 ◽

Author(s):

Sergey Fokin

Keyword(s):

Forest Fires ◽

Hydraulic System ◽

Economic Effect ◽

Heat Energy ◽

Wood Waste ◽

Processing Waste ◽

Operational Parameters ◽

Additional Source ◽

Milling Machines ◽

Working Bodies

Currently, wood waste in the form of a dissected crown on the ground and the root fraction of the tree's biomass in the ground remain in felling areas, becoming potentially dangerous combustible materials in the event of forest fires, as well as obstacles to reforestation activities, and possible foci of infections. Shredding wood waste into wood chips will solve the problem of their disposal by using fuel chips as an additional source of heat energy. In the present work, the influence of design and operational parameters of milling machines with a modernized hydraulic system and equipped with active working bodies on the process of shredding wood waste is established. The annual economic effect from the introduction of the developed complex of wood waste shredding machines and economic indicators from the use of fuel chips are given. This publication is intended for undergraduates and postgraduates engaged in scientific research in the field of forestry mechanization.

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Measuring system for monitoring the polydimensional deformation of superstructures of bridges and over-bridges improvement of volume hydraulic drive construction and road machines using flow shareholders

Bulletin of Kharkov National Automobile and Highway University ◽

10.30977/bul.2219-5548.2021.95.0.7 ◽

2021 ◽

pp. 7

Author(s):

Igor Pimonov

Keyword(s):

Service Life ◽

Hydraulic Drive ◽

Road Construction ◽

Measuring System ◽

Working Fluid ◽

Return Flow ◽

Flow Divider ◽

Working Volume ◽

Hydraulic Machines ◽

Hydraulic Motors

Due to its advantages, the hydraulic drive is widely used in road construction machines. Depending on its design, the share of the hydraulic drive, which is the most expensive unit of a road construction machine, accounts for thirty to eighty percent of all failures. Reliable hydraulic drive, provides, to a large extent, the reliability of the whole machine and the efficiency of the construction organization as a whole. The efficiency of the hydraulic drive of construction machines, and, as a consequence, the machines themselves, is ensured by a set of measures, among which the most important is the quality design, manufacture and operation, combined into a single structural system. Depending on the quality of cleaning of the working fluid, the service life of hydraulic machines can be increased or decreased several times. Accumulation of pollutants in the hydraulic drive, the hardness of which is significantly higher than the hardness of metals, causes rapid wear of the surfaces of hydraulic units and the service life is rapidly reduced. Cavitation in the pump is accompanied by a pulsation of fluid pressure and noise. These pulsations are due to the return flow of fluid from the discharge cavity of the pump, which is accompanied by hydraulic shocks and as a result of alternating shocks, a pressure pulsation in the discharge line of the pump. The amplitude of these pulsations can, under known conditions, reach a value that causes the destruction of the pump. The possibility of cavitation can be reduced by rational choice of modes of operation of the hydraulic system and the correct design of its units, but this phenomenon can be completely eliminated only by using auxiliary pumping pumps, as well as increasing the pressure in the suction line of the pump. On the basis of the analysis of perspective directions of improvement of the hydraulic drive of the excavator the following improved scheme of it is developed. Usually only high-flow hydraulic motors can be used in flow dividers. But in our case it is necessary that the device had, first of all, small mechanical losses and small cost, and accuracy of division of working liquid which follows on filters can be small. In the volume flow divider, hydraulic motors are used: gear, piston, vane, screw, roller. The simplest dividers of volume type are paired (connected by shafts) hydraulic motors of lamellar (vane) and roller types. Hydraulic motors in this scheme are flow measuring devices (dispensers), which supply for one revolution the volume of liquid, equal without taking into account the leaks in the hydraulic motor, its working volume. The use of a flow divider as a source of hydraulic energy makes it possible to improve the hydraulic drive by combining in a single system the purification of the working fluid and the ejector feed of the pump. The most promising, in terms of cost, are flow dividers based on vane and rotary hydraulic motors..

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Estimating fouling and hydraulic debottlenecking of a clarifier piping system in the expansion of a chemical manufacturing plant

Chemical Product and Process Modeling ◽

10.1515/cppm-2020-0029 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Avinashkumar V. Karre ◽

Deepak Sharma ◽

Kalliat T. Valsaraj

Keyword(s):

Hydraulic System ◽

Gulf Coast ◽

Piping System ◽

Manufacturing Plant ◽

Hydraulic Systems ◽

Manufacturing Facility ◽

Pressure Losses ◽

Chemical Manufacturing ◽

Plant Data ◽

Liquid Movement

AbstractDebottlenecking and estimating fouling in a clarifier piping system for the expansion of an existing chemical manufacturing facility in the U.S. Gulf Coast was analyzed and modified. The existing clarifier piping system fitting data was gathered for the real-world operation from the field. This data was used in the Applied Flow Technology (AFT) Fathom, a program used to study hydraulic systems. The hydraulic results with and without recommended piping modifications along with changing piping roughness factors were also analyzed. The two piping roughness factor cases tested were roughness of 0.152 mm and fouling of 25.4 mm. The AFT Fathom results showed that without piping modifications and specifying fouling of 25.4 mm, required flow cannot be established due to insufficient driving force for liquid movement. The measured field flow data confirmed that the reduced clarifier capacity was due to high pressure losses in the hydraulic system. Also, it was found that the existing clarifier nozzle was inadequately designed originally, and replacing the nozzle showed an increase in the clarifier capacity due to reduced entrainment of the air. These modifications were further adapted in the plant expansion and operations were validated using the actual plant data. The plant data matched closely with the estimated capacities of the clarifiers. AFT Fathom hydraulic software was effective in predicting a fouling severity in the clarifier piping system and debottlenecking of the clarifier capacity was done. The conclusions derived from this study can be used all over the world where clarifiers are utilized.

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TECHNIQUE OF FUNCTIONAL UNIFICATION OF ADAPTIVE HYDRAULIC DRIVE MODULE CAPABLE OF LOAD STABILIZATION ON THE WORKING BODY OF MOBILE MACHINES

Vestnik of Don State Technical University ◽

10.23947/1992-5980-2018-18-3-318-325 ◽

2018 ◽

Vol 18 (3) ◽

pp. 318-325

Author(s):

V. A. Pershin ◽

T. A. Khinikadze

Keyword(s):

Hydraulic System ◽

Hydraulic Drive ◽

Load Control ◽

Technical Equipment ◽

Adaptive Communications ◽

Hydraulic Motors ◽

Different Types ◽

First Time ◽

Similarity Method ◽

Selection Of

Introduction. Issues on the functional unification of the adaptive hydraulic drive module are studied. For the first time, self-adapting mechanisms are considered taking into account adaptive intercommunication of the load control and agreement of motions on the working body of the mobile machines. The work objective is to create and analyze the technique of the functional unification of the adaptive hydraulic drive module. In the furtherance of this goal, a number of tasks are solved. The selection of technical equipment – unified adaptive hydraulic drive modules of the mobile machines – is validated. The methodology and indicators of the module functional unification are described. Intercommunications are considered: direct positive and back negative ones. Their effect on the functional unification property of the adaptive module is shown.Materials and Methods. For the synthesis and analysis of the functional unification indicators of the adaptive module, a similarity method of the technical systems operation is adopted.Research Results. Techniques for structural-functional unification of the self-adapting modules are developed. Optional versions of the unified modules modification and proper combinations of hydraulic motors, regulating equipment, and mathematical models of adaptive communications are presented. Criteria and indicators of similarity are proposed. The functional unification of the adaptive intercommunications of the module and different types of the hydraulic motors and fluid throttling elements in the hydraulic system are analyzed. Recommendations for implementing the functional unification under typing and operation (adjustment) of the adaptive module are formulated.Discussion and Conclusions. The methodology is recommended for the functional unification of the hydraulic self-adapting module. It can be used for the development of unit sizes and under its operation as an independent drive or a hydraulic drive subsystem of a multifunctional or combined machine.

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OVERVIEW OF TECHNOLOGIES AND TECHNOLOGICAL EQUIPMENT FOR HAYME PROCESSING

ENGINEERING, ENERGY, TRANSPORT AIC ◽

10.37128/2520-6168-2020-3-15 ◽

2020 ◽

pp. 145-152

Author(s):

Serhiy Shargorodskiy ◽

Vasyliy Yanishevskiy ◽

Olga Yalina

Keyword(s):

Hydraulic Drive ◽

Limiting Factor ◽

Industrial Complex ◽

Smooth Flow ◽

Fodder Production ◽

Flow Divider ◽

Literary Sources ◽

Variable Displacement ◽

Food Needs ◽

Working Bodies

Fodder production is one of the most important sectors of the agro-industrial complex of Ukraine, the pace and scientific and technical level of development of which largely determines the solution of the country's food problem, full satisfaction of the population's food needs. A limiting factor for the development of this industry is the lack of efficient, easy-to-use and cheap equipment for collecting, raking, stirring, and pressing domestically produced hay, which would be able to compete with foreign analogues. The publication is devoted to the development of a hydraulic drive of the working bodies of the rake of a thief. The analysis of the designs of the existing machines for raking hay into rolls is carried out. A characteristic feature of these machines is the presence of specialized working bodies and the need to ensure a given frequency of their rotation. The proposed hydraulic scheme for the drive of the working bodies. The hydraulic drive consists of a variable displacement pumping station, a hydraulic flow divider and two hydraulic motors. The use of this drive allows to simplify the layout of the machine and provide an efficient drive in compliance with all process requirements. In addition, the use of a hydraulic drive allows you to increase the number of working bodies, thereby increasing the width of the rake - hackers. The introduction of these changes in the design of this unit will allow to reduce the number of passes of the rake-hacker and pick-up press across the field, thereby ensuring fuel economy. As the review of literary sources shows, the issues of collecting and storing hay are relevant not only for our country, but also for other European countries. The designs of domestic rakes - hackers are morally obsolete, do not meet modern agrotechnical requirements, have a small working width and require frequent repair and maintenance. Based on the results of the analysis of the designs of the drives of the working bodies of the rake - hackers, a hydraulic scheme for the drive of the working bodies was proposed. A feature of this hydraulic drive is the presence of a throttle flow distributor with the possibility of smooth flow control.

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EXPERIMENTAL RESOURCE STAND RESEARCH OF THE GOLDEN DIVISION DISTRIBUTOR

ENGINEERING, ENERGY, TRANSPORT AIC ◽

10.37128/2520-6168-2019-3-10 ◽

2019 ◽

pp. 80-86

Author(s):

Volodymyr Rutkevych

Keyword(s):

Hydraulic Drive ◽

Operating Conditions ◽

Working Fluid ◽

Stable Operation ◽

Initial Stage ◽

Flow Divider ◽

Main Components ◽

Working Bodies ◽

Cost Characteristics

The article discusses and analyzes the operating conditions of a modern hydraulic drive. Despite the difficult operating conditions of modern agricultural machinery (difficult working conditions, frequent changes in the technological load on the working bodies, low quality of the working fluid, increased dust content and temperature fluctuations), the hydraulic drive is its main reliable element. The basis of hydraulic drives is hydraulic spool type devices, they remain the main components of a modern hydraulic drive, are able to increase energy, dynamic, cost characteristics and increase the reliability and durability of this drive. The advantages, disadvantages and directions of improvement of this drive are noted. The modern directions of development of the hydraulic drive aimed at increasing the reliability, durability and adaptability to changing the technological load on the working bodies are considered. A booth design is proposed that allows to investigate a resource study of the developed spool splitter of a forage stem feeder. As a result of the research at the initial stage, some shortcomings in the structural implementation of the developed spool of the flow divider at the time up to 2·104 cycles were revealed. After analyzing the operating conditions and making changes to the design of the stem feeder spacer spacer and retesting, the spacer spacer showed stable operation, with more than 6.6·105 load cycles.

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