scholarly journals Hydraulic System with the Automatic Regulator of Liquid Flow and Investigation of its Operation

2018 ◽  
Vol 7 (4.7) ◽  
pp. 235
Author(s):  
Farit D. Bairamov ◽  
Bulat F. Bairamov
Keyword(s):  
Electric Motor ◽  
Hydraulic System ◽  
Rotation Frequency ◽  
Hydraulic Cylinder ◽  
Movement Speed ◽  
Hydraulic Motor ◽  
Hydraulic Actuators ◽  
Shaft Rotation ◽  
Automatic Regulator ◽  
Stability And Accuracy

Ensuring functioning of a hydraulic system requires the liquid consumption regulation given to the consumer. In hydraulic actuators by change of the liquid consumption regulation of the movement speed of an output link of the hydraulic engine is carried out: the movement speeds of the hydraulic cylinder piston or rotation frequency of a hydraulic motor shaft. In this work with the purpose of increase in efficiency of a hydraulic system and hydraulic actuators it is offered to use in them the most economical way of the liquid consumption regulation due to change of shaft rotation frequency of the pump engine. Schematic diagrams of a hydraulic system and hydraulic actuators with the automatic regulator of the liquid consumption are developed. For the drive of the pump the electric motor of alternating current is used. Shaft rotation frequency of the electric motor is regulated by the frequency converter.The linearized equations of dynamics of separate links of a hydraulic system from which after an exception of some variables the equations of dynamics of system in general are received are worked out. All equations are written down in a dimensionless form in relative deviations from a nominal operating mode of system. By consideration of hydraulic actuators the equation of dynamics of the hydraulic engine is in addition considered: hydraulic motor or hydraulic cylinder. At the same time the equations of dynamics of the pipeline and the hydraulic engine are replaced with one equation describing dynamics of the integrated link "the pipeline + the hydraulic engine".The research of stability and accuracy of functioning of a hydraulic system and hydraulic actuators is conducted. Accuracy of functioning is understood as the requirement that deviations of a consumption of the given liquid from its calculated value remained in in advance set limits. Stability conditions are received on the basis of Rauss - Gurvitz criterion, and for the solution of a problem of accuracy of functioning the method of functions of Lyapunov is used. The results received in article can be used at design of various adjustable hydraulic systems and hydraulic actuators for the rational choice of values of the parameters providing stability and accuracy of their functioning. 

Energy Harvesting From Vertical Deflection of Railroad Track Using a Hydraulic System for Improving Railroad Track Safety

2011 ◽  
Author(s):  
Carl A. Nelson ◽  
Abolfazl Pourghodrat ◽  
Mahmood Fateh
Keyword(s):  
Rotational Motion ◽  
Hydraulic System ◽  
Hydraulic Cylinder ◽  
Hydraulic Pressure ◽  
Vertical Deflection ◽  
Hydraulic Motor ◽  
Railroad Track ◽  
Track Maintenance ◽  
Remote Areas ◽  
Railroad Crossings

Grade crossings are locations of significant interest for prevention of collisions, injuries and fatalities in the railroad transportation system. Another area of concern is track maintenance, since derailments resulting from mechanically deficient track structures can cause significant endangerment to property and lives. A commonality between these two classes of incidents is that many occur in remote areas due to the lack of electrical infrastructure to power automated warning systems and/or track health monitoring sensor networks. Providing electrical infrastructure to railroad crossings in remote areas is often not economical, and other alternative sources of electricity such as solar and wind energy are not reliable and robust. This motivated development of a hydraulic system capable of harnessing power from vertical deflection of railroad track due to passing railcar traffic. A hydraulic cylinder mounted under the bottom of the rail is compressed and relaxed by passage of each railcar, forcing the hydraulic fluid towards a hydraulic motor and converting the hydraulic pressure and flow into rotational motion and torque. The rotational motion is amplified to drive a PMDC generator. The hydraulic system was developed and testing was performed to verify the functionality of the hydraulic system and quantify the power output.

Design of an Experimental Platform for Hydraulic Servo System

2011 ◽  
Vol 69 ◽  
pp. 51-54
Author(s):  
Jin Fang Zhu
Keyword(s):  
Hydraulic System ◽  
Servo System ◽  
Hydraulic Cylinder ◽  
Hydraulic Motor ◽  
Electronic Components ◽  
Servo Systems ◽  
Experimental Platform ◽  
Overall Design ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

VRLA (valve-regulated lead-acid) and Pump-control are the two kinds of power components for hydraulic servo system. With different command device, feedback measurement device and different corresponding electronic components, the hydraulic servo systems are different. To ensure maximum performance of the whole device, the overall design (including mechanical, electrical design) should be considered for hydraulic servo system. Machinery-electric-hydraulic should be in coordination with each other. The hydraulic system components are used to change the speed of hydraulic cylinder and alter direction of hydraulic cylinder and hydraulic motor. The solenoid valve for motor and hydraulic servo system and the control of pressure relay can implement by the electric section.

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.

Design and Characteristic Analysis for Indexing Mechanism of Rotation Worktable

2010 ◽  
Vol 34-35 ◽  
pp. 1573-1577 ◽  
Author(s):  
Guang Zhen Cheng ◽  
Yuan Bo Cheng
Keyword(s):  
Hydraulic Cylinder ◽  
Transmission Mechanism ◽  
Hydraulic Motor ◽  
Machine Process ◽  
Characteristic Analysis ◽  
Working Principle ◽  
Indexing Mechanism ◽  
Working Method

Aim is designing the indexing rotation worktable, used for machine process indexing rotation. in this paper introduced two kind of working method of rotation worktable, indexing rotation and circle feeding. Particularly discuss structure compose, drive fashion, transmission mechanism ,orientation clamp mechanism, working principle, indexing rotation action course, about swing hydraulic motor indexing mechanism, rack piston hydraulic cylinder indexing mechanism and hydraulic cylinder Geneva wheel indexing mechanism. through analysis and compare, summarize advantage and disadvantage of the three mechanisms, supply reference for designing and selecting indexing mechanism. the new is used hydraulic cylinder Geneva wheel mechanism to indexing rotation worktable.

Modelling, validation and parameter sensitivity of regenerative hydraulic-electric shock absorber

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Min Zhang ◽  
Cheng Hu ◽  
Jingwei Gao ◽  
Peng Zheng
Keyword(s):  
Electric Shock ◽  
Dynamic Modelling ◽  
Hydraulic Cylinder ◽  
Heavy Duty ◽  
Power Performance ◽  
Hydraulic Motor ◽  
Content Type ◽  
Railway Vehicles ◽  
Shock Absorbers ◽  
Component Design

PurposeSuspension is a significantly important component for automotive and railway vehicles. Regenerative hydraulic-electric shock absorbers (RHSA) have been proposed for the purpose of attenuating vibration of vehicle suspension, and also recover kinetic energy originated from vehicle vibration that is conventionally dissipated by hydraulic dampers. To advance the technology, the paper aims to present an RHSA system for heavy-duty and railway vehicles and create a dynamic modelling to discuss on the development process of RHSA model.Design/methodology/approachFirst, the development of RHSA dynamic model can be resolved into three stage models (an ideal one, a second one with an added accumulator and a third one that considers both accumulator and system losses) to comprehensively evaluate the RHSA's characterisation. Second, a prototype is fabricated for testing and the results meet desired agreements between simulation and measurement. Finally, the study of key parameters is carried out to investigate the influences of hydraulic-cylinder size, hydraulic-motor displacement and accumulator pre-charged pressure on the RHSA system.FindingsThe findings of sensitivity analysis indicate that the component design can satisfy the damping characteristics and power performance required for heavy-duty vehicle, freight wagon and typical passenger train. The results also show that reducing the losses is highly beneficial for saving suspension energy, improving system reliability and increasing power-conversion efficiency.Originality/valueThe paper presents a more detailed method for the development and analysis of a RHSA. Compared with the typical shock absorbers, RHSA can also recover the vibration energy dissipated by suspension.

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 Hydraulic System Design of Hydraulic Actuators for Large Butterfly Valves

2014 ◽  
Vol 7 (4) ◽  
pp. 150-155
Author(s):  
Ye HUANG ◽  
◽  
Changsheng LIU ◽  
Shiongur Bamed ◽  
◽  
...  
Keyword(s):  
System Design ◽  
Hydraulic System ◽  
Hydraulic Actuators ◽  
Hydraulic System Design

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.

Hydraulic Model and Simulation Analysis for Monorail Brake System

2013 ◽  
Vol 278-280 ◽  
pp. 350-353 ◽  
Author(s):  
Feng Gao ◽  
Lin Jing Xiao ◽  
Shuai Guo ◽  
Hong Gang Ma
Keyword(s):  
Hydraulic System ◽  
Simulation Analysis ◽  
Hydraulic Cylinder ◽  
Mine Safety ◽  
Brake System ◽  
Flow Area ◽  
Throttle Valve ◽  
Model And Simulation ◽  
Spring Force ◽  
Unloading Time

This paper mainly analyzes the hydraulic system principle during the monorail braking, and come to a conclusion that the spring stiffness and the throttle valve flow area are main factors affect the brake system. Then we use the MSC.EASY5 to modeling the hydraulic system, and simulate the unloading time of hydraulic cylinder under the spring force, the result shows that, the response time of a braking system can meet the requirement of the coal mine safety regulation, and change the flow area of throttle valve will affect the brake system.

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