Stabilization of the Speed of the Hydraulic Motor Through Throttle Compensation for Volume Losses

2020 ◽  
Vol 26 (3) ◽  
pp. 126-130
Author(s):  
Krasimir Kalev
Keyword(s):  
Flow Rate ◽  
Hydraulic Drive ◽  
Pressure Change ◽  
Operating Conditions ◽  
Drive System ◽  
Inlet Pressure ◽  
Schematic Diagram ◽  
Hydraulic Characteristics ◽  
Hydraulic Motor ◽  
Flow Through

AbstractA schematic diagram of a hydraulic drive system is provided to stabilize the speed of the working body by compensating for volumetric losses in the hydraulic motor. The diagram shows the inclusion of an originally developed self-adjusting choke whose flow rate in the inlet pressure change range tends to reverse - with increasing pressure the flow through it decreases. Dependent on the hydraulic characteristics of the hydraulic motor and the specific operating conditions.

The Transitional Simulation of Self-Propelled Winch System by the AMESim

2014 ◽  
Vol 687-691 ◽  
pp. 228-231
Author(s):  
Jing Tao Yue ◽  
Hui Pu ◽  
Xiao Jun Wei
Keyword(s):  
Hydraulic System ◽  
Structural Characteristics ◽  
System Simulation ◽  
Hydraulic Drive ◽  
Simulation Models ◽  
Operating Conditions ◽  
The Self ◽  
Hydraulic Motor ◽  
Control Loops ◽  
System Operating

The self-propelled winch system was studied taking the 20-ton transitional self-driven winch system as the engineering background. By the analysis of structural characteristics, control loops, speed solutions and hydraulic motor-driven forms of winch hydraulic system, The system of mathematical models was established which lay the foundation of the establishment of system simulation model. The walking hydraulic drive system simulation models were established by using AMESim software. On this basis, by setting different parameters, the simulation system operating conditions are simulated, which verified the rationality and stability of the design of the winch hydraulic transmission system.

scholarly journals IMPROVEMENT OF TECHNOLOGICAL EQUIPMENT OF THE MACHINE FOR TRIMMING TREE CROWNS IN ROADSIDE FOREST BELTS

2017 ◽  
Vol 7 (1) ◽  
pp. 205-210
Author(s):  
Попиков ◽  
Petr Popikov ◽  
Бухтояров ◽  
Leonid Bukhtoyarov
Keyword(s):  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Operating Conditions ◽  
Cutting Process ◽  
Design Parameters ◽  
Working Fluid ◽  
Hydraulic Motor ◽  
Technological Parameters ◽  
Tree Crowns ◽  
Circular Saw

When cleaning cutting, pruning of branches of roadside trees and shelter belt contour cutters are widely used, cutters is designed for total horizontal, vertical and oblique trimming crowns. These devices are hinged or removable ones and aggregated with wheeled tractors of traction class 0.6 to 1.4 kN, widespread in forestry. Improving the design of such devices is made in the following areas: cutting devices and hydraulic drives. In the proposed working body of the machine for cutting tree crowns containing base machine, crane on the handle of which a rotary hydraulic motor (rotator)is mounted, the shaft of which has movable connection with the housing of the circular saw with one-sided sharpening in the direction of the detachable part of the branch, V-shaped emphasis in the form of unilateral action hydraulic cylinder with spring-loaded rod, piston cavity which is connected in series with the drain lines of the hydraulic motor which is mounted an adjustable throttle to create pressure of the working fluid (support). In this implementation of the device when circular goes deep into the branch, which is cut, the V - shaped support with spring-loaded rod moves all the way in the branch and eliminates the clamping of the saw blade in the cut, which will improve reliability and performance. The article has developed a mathematical model of device for pruning tree crowns by circular saw with hydraulic drive on the basis of common methodology for the simulation of planar mechanisms. Differential equations of the cutting process were composed. The model of proposed design of the device for cutting tree crowns allows to study the influence of geometrical and mechanical parameters of the branches of the trees, technological parameters of cutting process on energy consumption and quality of the cut, taking into account design parameters. The model allows also to assess the performance and to examine the effectiveness of the device in different operating conditions.

Data Assimilation of Steam Flow Through a Control Valve Using Ensemble Kalman Filter

2021 ◽  
Author(s):  
Peixun Fang ◽  
Chuangxin He ◽  
Peng Wang ◽  
Sihua Xu ◽  
YingZheng Liu
Keyword(s):  
Kalman Filter ◽  
Kinetic Energy ◽  
Data Assimilation ◽  
Turbulent Kinetic Energy ◽  
Flow Rate ◽  
Ensemble Kalman Filter ◽  
Control Valve ◽  
Operating Conditions ◽  
Constant Matrix ◽  
Flow Through

Abstract The present work concentrates on the simulation enhancement of steam flow through a control valve using novel data assimilation (DA) approach. Ensemble Kalman filter (EnKF) is applied to improve the performance of k-? shear stress transport (SST) model by optimizing its turbulence model constants. The selected measurement data at different operating conditions are used as observation, while the rest data are involved for validation. Firstly, four flow patterns, which arise on their respective operating conditions, are identified and analyzed to illustrate the basic characteristics of flow in the control valve. Then DA is performed based on the sample computation by perturbing the model constants and the EnKF process to determine the optimal constant matrix. This optimized constant matrix is subsequently used for the precomputation of the valve flow with significant improvement on the flow rate prediction. The velocity and turbulent kinetic energy fields with default and optimal model constants are also compared to illustrate the effect of DA. The results show that the DA enhanced model constants can significantly reduce the predicted volume flow rate error at all opening ratios presently concerned. With updated model constants, the velocity and turbulent kinetic energy distributions are greatly modified in the valve seat between main valve and control valve.

Modeling and Simulation of the Speed Regulating System of a Planetary Mixer

2011 ◽  
Vol 422 ◽  
pp. 113-116 ◽  
Author(s):  
Ming Jin Yang ◽  
Xi Wen Li ◽  
Zhi Gang Wang ◽  
Tie Lin Shi
Keyword(s):  
Modeling And Simulation ◽  
Simulation Model ◽  
Hydraulic Drive ◽  
Drive System ◽  
Rotary Inertia ◽  
Hydraulic Motor ◽  
Speed Response

Hydraulic drive mixers are widely employed to process the cohesive mixture, especially the energetic mixture. According to the mathematic models of main links of the speed regulating system of a hydraulic drive planetary mixer, a simulation model for the system was presented in this paper. The load and impulsion have impacts on the speed response of the speed regulating system with good performance of stability. The converted rotary inertia of the hydraulic motor has a two-sided impact on the speed regulating system, namely impact the response and the overshoot performance at the same time. And, the leakage of the hydraulic drive system often has a bad impact on the speed response of the regulating system.

The Numerical and Experimental Investigation Into Hydraulic Characteristics of a No-Load Running Check Valve due to Fluid-Structure Interaction

2018 ◽  
Author(s):  
Xiang-yuan Zhang ◽  
Zhi-jun Shuai ◽  
Chen-xing Jiang ◽  
Wan-you Li ◽  
Jie Jian
Keyword(s):  
Flow Rate ◽  
Ambient Pressure ◽  
Check Valve ◽  
Operating Conditions ◽  
Flow Coefficient ◽  
Pipeline System ◽  
Piping System ◽  
Hydraulic Characteristics ◽  
Mass System ◽  
Excited Vibration

Valve is a very important unit in pipeline system. The valve flow fluctuation brings about structural vibration and unpopular noise, and even leads to the safety problems and disasters. In this paper, a special no-load running check valve is investigated. The check valve is structural complex with one inlet and two outlets. It can be simplified as a spring-mass system which manipulates the flow rate by combine action of the ambient pressure of medium and the spring deformation. The three-dimensional model of the valve is established and also the relationship between pressure drops and flow rate of the valve is obtained in various openings and operating conditions. The structure modals were verified by the field tests and thus its fixing boundaries are obtained correctly. The mechanism causing self-excited vibration of a piping system is determined using a dynamic model which couples the hydraulics of internal flow with the structural motion of a three-ports passive check valve. The coupling is obtained by making the fluid flow coefficient at the check valve to be a function of valve plug displacement. The results are compared with the experimental data, which verifies the correctness of the theoretical results. It is shown that the special valve has its own hydraulic characteristics, which greatly influence its flow distribution as it has two outlets. It was also testified that the coupling between fluid and structure changes its natural frequencies and has a non-negligible impact on the pressure fluctuation while working.

RATIONALE FOR THE APPLICABILITY LIMITS OF POWER SUPPLY SYSTEMS OF SPRINKLERS

2020 ◽  
pp. 49-56
Author(s):  
SERGEY M. BAKIROV SERGEY M. ◽  
Keyword(s):  
Electric Drive ◽  
Power Supply ◽  
Hydraulic Drive ◽  
Supply System ◽  
Operating Conditions ◽  
Operating Costs ◽  
Hydraulic Motor ◽  
Power Sources ◽  
Effi Ciency ◽  
Supply Systems

Diff erent power supply systems with hydraulic, electric and mechanical drive are used in sprinklers for watering crops of the same type. Depending on the agrotechnical operating conditions of sprinklers, the systems diff er from each other in terms of energy and operating costs in 1.5…4.2 times. The paper considers a problem of choosing the optimal power supply system for a sprinkler unit working under specifi c conditions. The author has examined power supply systems for sprinklers: a hydraulic drive with a rotating hydraulic motor; a hydraulic drive with a reciprocating hydraulic motor; a mechanical drive; an electric drive powered by a cable line, an overhead line, a portable generator or accumulator batteries, which are all characterized by an individual resulting quality indicator. This indicator can be represented by any parameter of the system. Applying the theory of vector synthesis, he has chosen the effi ciency criterion as an indicator that takes into account the system parameters: specifi c power, energy losses, reliability indicator, operating costs, cost and mass of the system elements; as well as agrotechnical conditions: inlet pressure, distance from the water reservoir and centralized energy supply system, investments in sprinklers, irrigation rate, irrigation area and irrigation profi t. According to the effi ciency criterion, a graphical solution to the problem has been presented and it has been established that systems with an electric drive and various power sources are feasible for areas of more than 40 hectares, those with a hydraulic drive – for an irrigated area of less than 40 hectares, and those with a mechanical drive – less than 6 hectares.

scholarly journals Simulation of loading dynamics and hydrodynamics of drives of forest machine working bodies

2021 ◽  
Vol 875 (1) ◽  
pp. 012060
Author(s):  
N Yu Yudina ◽  
R V Yudin ◽  
A I Maksimenkov
Keyword(s):  
Hydraulic System ◽  
Hydraulic Drive ◽  
Pressure Change ◽  
Hydraulic Cylinder ◽  
Inertial Forces ◽  
Hydraulic Motor ◽  
Process Dynamics ◽  
Dynamic Factors ◽  
Working Bodies ◽  
Body Loading

Abstract The need to take into account the dynamic processes that occur when performing technological operations using the working bodies of forest machines with a hydraulic drive is due to the fact that its absence leads to a distortion of the obtained results, since the kinematic schemes do not take into account the influence of hydraulic fluid in the elements of the hydraulic system. In this regard, it became necessary to develop models that take into account the dynamics of working body loading and the hydrodynamics of its drives. It is recommended to consider the influence of the process dynamics by introducing dynamic factors. The resulting mathematical model allows you to determine the actual values of the hydraulic cylinder, taking into account the errors associated with fluid leakage. As a result of the study, it was possible to connect the pressure change in the hydraulic cylinder, the movement of the pistons in the hydraulic cylinder and the rotor of the hydraulic motor, as well as the appearance of inertial forces. The connecting component is the balance of fluid and hydraulic system volumes.

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

Study of fluid flow through a channel deformed by piezoelement

2018 ◽  
Vol 13 (3) ◽  
pp. 1-10 ◽  
Author(s):  
I.Sh. Nasibullayev ◽  
E.Sh Nasibullaeva ◽  
O.V. Darintsev
Keyword(s):  
Fluid Flow ◽  
Pressure Drop ◽  
Boundary Conditions ◽  
Flow Rate ◽  
Contact Surface ◽  
Piezoelectric Element ◽  
Neumann Boundary ◽  
Differential Pressure ◽  
Physical Parameters ◽  
Flow Through

The flow of a liquid through a tube deformed by a piezoelectric cell under a harmonic law is studied in this paper. Linear deformations are compared for the Dirichlet and Neumann boundary conditions on the contact surface of the tube and piezoelectric element. The flow of fluid through a deformed channel for two flow regimes is investigated: in a tube with one closed end due to deformation of the tube; for a tube with two open ends due to deformation of the tube and the differential pressure applied to the channel. The flow rate of the liquid is calculated as a function of the frequency of the deformations, the pressure drop and the physical parameters of the liquid.

Sign in / Sign up

Export Citation Format

Share Document