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1
Sepehri, N., G. A. M. Dumont, P. D. Lawrence, and F. Sassani. "Cascade control of hydraulically actuated manipulators." Robotica 8, no. 3 (July 1990): 207–16. http://dx.doi.org/10.1017/s0263574700000060.
Повний текст джерелаАнотація:
SUMMARYA fundamental study on the control of hydraulically actuated robots is presented. Dynamic modelling is performed in both time-domain and frequency-domain. It is shown that the inclusion of hydraulic elements increases the order of the system. Hydraulic compliance is the most effective factor in this regard.Three distinct control strategies are applied. Their performances are evaluated and compared. All three methods are exemplified with a two link hydraulic robot in a computer simulation. The robot has the same hydraulic configuration as many existing industrial manipulators. The simulation program is written in ACSL (Advanced Continuous Simulation Language) running on a VAX 11/750.
2
PARKHOMENKO, S. G., and G. G. PARKHOMENKO. "SIMULATION OF AUTOMATIC CONTROL SYSTEMS OF TILLAGE UNITS." Traktory i sel hozmashiny 84, no. 1 (January 15, 2017): 22–31. http://dx.doi.org/10.17816/0321-4443-66258.
Повний текст джерелаАнотація:
The studies were performed to improve workflow of hydraulic automatic control systems of the tillage units. Tillage quality should not deteriorate. Working bodies of tillage machines have to be moved automatically. Automated devices can be separated into two groups: direct and indirect action. It is preferable to indirect action. The article presents analysis of automatic devices used into tillage machines. Automatic control systems can be hydraulic, electro-hydraulic and pneumatic. Mechanical systems are not effective. Hydraulic systems are cheaper electric and pneumatic. They provide best of energy and quality indicators of technological process of tillage. Automatic control systems are uses draft forces, hitch position, depth of the implement, speed, acceleration and other sensors. Method of computer modeling and optimization of hydraulic automatic control systems of tillage units was developed. Results of computer modeling of hydraulic automatic control systems help to select direction of improving quality and energy indicators of technological process of tillage. Optimized combine implement depth and draft control system of arable unit allow reducing deviation the draft force of the plow; deviation of the depth of plowing is equal to or smaller than agro-technical requirements. Deviation of the draft force was decreased to 13.5 % for deviation specific soil resistance - 20 %, depth of plowing - 0.21 m, deviation of the depth of plowing - 0.019 m (9 %). Deviation of the depth of plowing may be decreased to 0.010 m (4,8 %), but deviation of the draft force shell be increased up to 16.2%. Optimized hydraulic automatic control system of garden tiller with a trapezoidal mechanism leaves smaller untreated soil area from 1.37-1.46 times.
3
Tomlinson, S. P., and D. G. Tilley. "Computer Modelling of Aircraft Hydraulic Systems Using Bathfp." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 207, no. 2 (July 1993): 139–43. http://dx.doi.org/10.1243/pime_proc_1993_207_258_02.
Повний текст джерелаАнотація:
The computer simulation package BATHfp has been developed at the Fluid Power Centre, University of Bath to perform transient time domain simulations of fluid power systems. Utilities are provided which allow new models to be introduced into the component database. This enables the package to be tailored to particular dedicated areas of interest such as aircraft flight controls, braking and landing gear and fuel flow systems. This paper describes the application of BATHfp to aircraft hydraulic systems. An example is taken of an electrohydraulic position control system which uses an actuator to move an aileron according to a desired schedule. Parametric variations are made to illustrate how system performance can be improved.
4
Ułanowicz, Leszek, and Ryszard Sabak. "Computer Aided Design Process for Hydraulic Servo." Journal of KONBiN 52, no. 4 (December 1, 2022): 11–40. http://dx.doi.org/10.2478/jok-2022-0039.
Повний текст джерелаАнотація:
Abstract This study presents a method of computer support for the design of a hydraulic servo dedicated to the aircraft control system. A 3D geometric model of the servo was developed, which enabled the simulation of its kinematics. The paper presents a simulation model of a hydraulic servo that enables simulation of the dynamics of its mechanisms. The servomechanism model takes into account the dynamics of the movement of the distributor slider and the dynamics of the actuator piston rod movement under the influence of forces occurring in the servo. As a result of the simulation, step characteristics and static characteristics of the servo response were obtained. The presented model makes it possible to visualize the dynamics of operation of the prototype servo in various modes of its operation with different parameters of its control. It allows you to quickly and conveniently test the concept of an hydraulic servo and evaluate its functioning.
5
Lau, K. K., K. A. Edge, and D. N. Johnston. "Impedance Characteristics of Hydraulic Orifices." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 209, no. 4 (November 1995): 241–53. http://dx.doi.org/10.1243/pime_proc_1995_209_392_02.
Повний текст джерелаАнотація:
The impedance characteristics of cylindrical and sharp-edged hydraulic orifices under non-zero mean flow conditions have been investigated through experimental measurement and computational fluid dynamics (CFD) simulation studies. Based upon these investigations a generic model of the impedance characteristics of orifices has been developed. This model can be adopted in computer simulations of pressure ripple in hydraulic systems. The results of this investigation also provide the basis for modelling more complex hydraulic components.
6
MUTO, Takayoshi, Akio SEKO, and Ryuji MOHRI. "Development of Simulation Program for Hydraulic Control Systems Using Personal Computer." Hydraulics & Pneumatics 25, no. 6 (1994): 753–61. http://dx.doi.org/10.5739/jfps1970.25.753.
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7
Li, Wen Hua, and Yu Ling Du. "Based on Fluid Digital Transmission and Control Theory on Application of Digital Hydraulic Valve." Advanced Materials Research 619 (December 2012): 455–58. http://dx.doi.org/10.4028/www.scientific.net/amr.619.455.
Повний текст джерелаАнотація:
A digital hydraulic valve is a new control theory and method, it is through the electronic control unit installed in a conventional valve, and integrated processing, the formation of a wide variety of digital valve，By the digital-to-analog conversion element is directly connected with the computer. Using the computer output pulse number and frequency to control electro hydraulic system pressure and measurement. The system proposed can make the hydraulic system has the advantages of high efficiency, high speed, high reliability. And used Matlab/Simulink software to control system performance simulation analysis, experiment and simulation results show that, this system has great application prospect and practical value.
8
Muto, Takayoshi, Junji Fukumori, Akio Seko, and Hironao Yamada. "Software Package BDSP Developed to Simulate Hydraulic Systems." Journal of Robotics and Mechatronics 10, no. 6 (December 20, 1998): 494–98. http://dx.doi.org/10.20965/jrm.1998.p0494.
Повний текст джерелаАнотація:
We developed simulation software for hydraulic control systems enabling the operator to simulate dynamic system performance without special knowledge of software or control engineering. The program was for use on conventional personal computers. Simulation proceeds with each operation very simply based on system block diagram representation. A GUI enabled almost all simulation operations to be done using display windows. The program simulates fluid line elements, nonlinear elements, and discrete time control.
9
Chen, Linlin. "Hydraulic Lifting and Rotating System Lifting Machinery Transmission Control Design." Mobile Information Systems 2022 (June 7, 2022): 1–6. http://dx.doi.org/10.1155/2022/4617971.
Повний текст джерелаАнотація:
With the continuous improvement of the level of intelligence in the construction machinery industry, as one of the core technologies in the hydraulic lifting and rotating system, the lifting transmission control system has become a key factor in determining the performance of the elevator. As a hydraulic lifting machine with high protection level and powerful functions, the mechanical transmission controller has been recognized by the market. This study is based on the design of lifting machinery transmission control of hydraulic lifting and rotating system and studies the lifting mechanism transmission system in the hydraulic lifting and rotating system required for engineering operation. According to the functional characteristics of the transmission controller of the lifting mechanism, the control system scheme is designed. On this basis, the system design of the lift machinery transmission control and, according to this design, the functions of driving speed control and transmission mode switching are studied. Starting from the movement mechanism of hydraulic continuous lifting technology, this research carried out the principle design of mechanical transmission control, related calculations, selection of hydraulic components, corresponding simulations, structural design of mechanical transmission, and tests of hydraulic power systems. Finally, the control system was verified through simulation experiments, and technical difficulties such as the liquid supply mode of the large-flow system, the selection of standby working conditions, and the reliability and safety design were solved. It can be seen from the simulation results that, as the displacement ratio increases, the system efficiency increases, reaching more than 70%. When the valve opening reaches 20° when the valve port is closed, the efficiency of the power control valve reaches 95%. It can be seen that the control system established in this study has more advantages in power and economy. The transmission control system of hoisting machinery designed in this study can give greater play to its transmission efficiency and significantly reduce the working time and intensity of the operator.
10
Wang, Jiayi, Xinhui Liu, Jinshi Chen, Tongjian Wang, and Xin Wang. "Mechanical-Hydraulic Co-Simulation of Full Hydraulic Articulated Steering System." Computer Systems Science and Engineering 37, no. 3 (2021): 381–98. http://dx.doi.org/10.32604/csse.2021.014011.
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11
Xu, Xiang, Zhi Xiong Li, and Hong Ling Qin. "Design and Integrated Simulation of the Electro-Hydraulic Servo System Based on AMESim and Matlab." Applied Mechanics and Materials 44-47 (December 2010): 1355–59. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.1355.
Повний текст джерелаАнотація:
Since electro-hydraulic servo system has fast response and highest control accuracy, it has been widely used in industrial application, including aircraft, mining, manufacturing, and agriculture, etc. With the fast development of computer science, it is feasible and available to evaluate the performance of the designed control system via virtual simulation before the practical usage of the system. In order to optimize the design procedure of the electro-hydraulic proportional controller, the co-simulation design method based on AMESim-Matlab is presented for the electro-hydraulic servo system in this paper. High accuracy of the mathematical model of electro-hydraulic servo system was full-fitted by the use of AMESim, and the advantage of high solving precision for large amount of calculation was full played using Matlab. The PID controller was employed to realize the efficient control of the motion of the hydraulic cylinder. The united simulation technique was adopted to verify the good performance of the designed control system. The simulation results suggest that the proposed method is effective for the design of electro-hydraulic servo systems and thus has application importance.
12
Yang, Ji Dong, and Xin Chen. "Giant Die Forging Press Machine Main Circuit Electromechanical Hydraulic Servo Control System Modeling and Simulation." Advanced Materials Research 317-319 (August 2011): 655–60. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.655.
Повний текст джерелаАнотація:
This paper research on an electromechanical hydraulic mixture control system used in large scale die-forging press, based on the national major science and technology project (2009ZX04005-011). This mixture control system used in press machine accomplishes pressing, pressure-keeping, return. The control system uses hydraulic oil to control three-position five-path slide valve as hydraulic system main valve, for drive system of giant die forging press is characteristic of ultrahigh pressure and large flow, high power. This control system consists of two parts: firstly, establishing electromechanical hydraulic mixture control model by adding electronics and feedback section to servo slide system. Secondly, combining existing slide control hydraulic cylinder model and server slide system form main circuit closed-loop control system. The last but not least, Computer simulation was conducted by matlab got the ideal control curve.
13
Guo, Baoling, Amgad Mohamed, Seddik Bacha, Mazen Alamir, Cédric Boudinet, and Julien Pouget. "Reduced-Scale Models of Variable Speed Hydro-Electric Plants for Power Hardware-in-the-Loop Real-Time Simulations." Energies 13, no. 21 (November 3, 2020): 5764. http://dx.doi.org/10.3390/en13215764.
Повний текст джерелаАнотація:
Variable Speed Hydro-Electric Plant (VS-HEP) equipped with power electronics has been increasingly introduced into the hydraulic context. This paper is targeting a VS-HEP Power Hardware-In-the-Loop (PHIL) real-time simulation system, which is dedicated to different hydraulic operation schemes tests and control laws validation. Then, a proper hydraulic model will be the key factor for building an efficient PHIL real-time simulation system. This work introduces a practical and generalised modelling hydraulic modelling approach, which is based on ‘Hill Charts’ measurements provided by industrial manufacturers. The hydraulic static model is analytically obtained by using mathematical optimization routines. In addition, the nonlinear dynamic model of the guide vane actuator is introduced in order to evaluate the effects of the induced dynamics on the electric control performances. Moreover, the reduced-scale models adapted to different laboratory conditions can be established by applying scaling laws. The suggested modelling approach enables the features of decent accuracy, light computational complexity, high flexibility and wide applications for their implementations on PHIL real-time simulations. Finally, a grid-connected energy conversion chain of bulb hydraulic turbine associated with a permanent magnet synchronous generator is chosen as an example for PHIL design and performance assessment.
14
Zhang, Hui Xian, and Ling Xia Miao. "Modeling and Experiment on Active Vibration Control of Hydraulic Excitation System." Applied Mechanics and Materials 187 (June 2012): 130–33. http://dx.doi.org/10.4028/www.scientific.net/amm.187.130.
Повний текст джерелаАнотація:
For studying dynamic characteristics of fluid filled pipe under hydraulic excitation force generated actively by a new developed vibration exciter, at first a computer code based on the method of characteristics (MOC) was developed. Then the excitation force calculated by MOC was applied to the corresponding nodes of finite element of pipe, by using Newmark’s method, the dynamic response at every cross section of pipe was obtained. The numerical simulations show that a simple harmonic motion arises at every cross section of the pipe, and the lateral vibration amplitude of every node along the pipe increases as the rising excitation force. In addition, measured data were compared with numerical simulation, which were basically consistent with each other.
15
Ling, Qi Hui, Xiao Qiang Yan, and Yi Fang Zhang. "Research on Harmonic Response of Hydraulic Screwdown System on Modern Hot Rolling Mill." Advanced Materials Research 572 (October 2012): 203–9. http://dx.doi.org/10.4028/www.scientific.net/amr.572.203.
Повний текст джерелаАнотація:
In this paper, the dynamic mathematical model about the asymmetric three-potential four-way valve control asymmetric hydraulic cylinder is established, and a hot rolling mill hydraulic screwdown system simulation model is constructed to research the dynamic characteristics by MATLAB/Simulink. It is obtained that the displacement output curve of the hydraulic cylinder by changing the rolling different strip thickness. Finally contrasting the input and output spectrum curve, it found that given the vibration signal by hydraulic system can transfer to the hydraulic cylinder. At the same time it indicate that the computer simulation is the effective way that research the dynamic characteristics of the hydraulic screwdown.
16
Kovalev, I. S. "MATHEMATICAL AND COMPUTER SIMULATION OF THE COMMERTIAL VEHICLE’S HYDRAULIC RETARDER." Vestnik SibADI 15, no. 3 (July 11, 2018): 400–411. http://dx.doi.org/10.26518/2071-7296-2018-3-400-411.
Повний текст джерелаАнотація:
Introduction.The article represents the mathematical model of commercial vehicle’s hydraulic retarder. The model is based on the mathematical model of the variable filling hydraulic dynamometer.Materials and methods.The retarder model was designed with the possibility of its integration with the mathematical model of the engine cooling system. For this purpose, the state function of fluid temperature in a working chamber of the retarder was added to the retarder model. Consequently, fluid compression in the working chamber was included into the model to avoid unlimited filling because of possible high pressure at the retarder inlet.Results.The simulation model of the retarder was established as LMS Amesim submodel using C-programming language. For testing, the retarder simulation model was integrated with the Amesim models of the engine cooling system and with the powertrain and vehicle movement dynamics. In addition, brake torque regulation wassynthesized on PI controllers.Discussion and conclusions. During simulation of the vehicle movement on the mountain route expectable results were obtain, such as continuous braking via the retarder, which led to increasing of the cooling system’s fluid temperature. Therefore, overfilling of the retarder working chamber didn’t occur through the fluid compression. The retarder model could be applied to determine retarder design influence at vehicle functioning. For instance, it could be used for development of the algorithms’ control.
17
Hwang, Hsiu-Ying, Tian-Syung Lan, and Jia-Shiun Chen. "Optimization and Application for Hydraulic Electric Hybrid Vehicle." Energies 13, no. 2 (January 9, 2020): 322. http://dx.doi.org/10.3390/en13020322.
Повний текст джерелаАнотація:
Targeting the application of medium and heavy vehicles, a hydraulic electric hybrid vehicle (HEHV) was designed, and its energy management control strategy is discussed in this paper. Matlab/Simulink was applied to establish the pure electric vehicle and HEHV models, and backward simulation was adopted for the simulation, to get the variation of torque and battery state of charge (SOC) through New York City Cycle of the US Environmental Protection Agency (EPA NYCC). Based on the simulation, the energy management strategy was designed. In this research, the rule-based control strategy was implemented as the energy distribution management strategy first, and then the genetic algorithm was utilized to conduct global optimization strategy analysis. The results from the genetic algorithm were employed to modify the rule-based control strategy to improve the electricity economic performance of the vehicle. The simulation results show that the electricity economic performance of the designed hydraulic hybrid vehicle was improved by 36.51% compared to that of a pure electric vehicle. The performance of energy consumption after genetic algorithm optimization was improved by 43.65%.
18
Wang, Jing Fu, and Lu Yang Wang. "Simulation Research on Effects of Low Velocity Characteristics to Direct Drive Volume Control Systems." Applied Mechanics and Materials 464 (November 2013): 310–15. http://dx.doi.org/10.4028/www.scientific.net/amm.464.310.
Повний текст джерелаАнотація:
The Direct Drive Volume Control (DDVC) Electro-hydraulic Servo System is a new Electro-hydraulic Servo System. It has the advantages of flexibility of AC servo motor control and high power of hydraulic servo system. Compared with the traditional electro-hydraulic servo system, the DDVC system is efficient, miniaturized integrated, convenient operated and economical. It has been used in many domains, and made great economic benefits. So it is widely considered to be one of the most important developing directions of the hydraulic control system. It will be widely used in more and more areas in the future. With the development of its application, how to improve the trajectory tracking precision of the DDVC system in low velocity motions becomes more important in the field. So that, the level of the low velocity characteristic impacted the system become to an important subject. In this paper, the mathematical mode of AC asynchronism motor Direct Torque Control was established, and the simulation mode was built. In addition, the idealized model of the DDVC system which based on united simulation of AMEsim/Simulink was established, simulation was executed. In order to make the research available, the low velocity characteristic of the DDVC system was also analyzed, and the low velocity characteristic simulation model was built. Computer simulation validated that the friction, the leakage and the mechanical losses are seriously influenced the system performance when the system working on the low velocity mode.
19
Liu, Tong. "Research on stability of hydraulic system based on nonlinear PID control." Nonlinear Engineering 11, no. 1 (January 1, 2022): 494–99. http://dx.doi.org/10.1515/nleng-2022-0222.
Повний текст джерелаАнотація:
Abstract In order to avoid the interference of the excavator hydraulic control system by external factors, the output stability of the hydraulic control system has to be improved. The method introduces a nonlinear Proportional integral differentiation (PID) controller with deviation correction parameters through the simulation verification of the control effect and the creation of excavator hydraulic drive diagram. PID, whose full English name is proportional integral derivative, is a mathematical and physical term. The controller is modeled in Matlab/Simulink. Finally, the whole hydraulic system is co-simulated by the interface of AMESim and Matlab. The simulation results show that the system model realizes the co-simulation through the interface combination of the two software, which is more accurate than the traditional PID control, and the pressure and flow fluctuation are smaller, which can suppress the interference of external load mutation, and improve the stability of the hydraulic drive output of the excavator. The validity of the experiment is verified.
20
Ai, Chao, Wei Gao, Qinyu Hu, Yankang Zhang, Lijuan Chen, Jiawei Guo, and Zengrui Han. "Application of the Feedback Linearization in Maximum Power Point Tracking Control for Hydraulic Wind Turbine." Energies 13, no. 6 (March 24, 2020): 1529. http://dx.doi.org/10.3390/en13061529.
Повний текст джерелаАнотація:
Taking the hydraulic wind turbine as the research object, the method is studied to improve the utilization ratio of wind energy for hydraulic wind turbine, when the wind speed is lower than the rated wind speed. The hydraulic fixed displacement pump speed and generating power can be used as control output to realize the maximum power point tracking control. The characteristics of the maximum power point tracking control are analyzed for hydraulic wind turbine, and the hydraulic output power is taken as control output based on the comprehensive performance requirements. Because the hydraulic wind turbine is a strong multiplication nonlinear system, the system is globally linearized based the feedback linearization method, and the maximum power point tracking control law is obtained. The simulation and experiment results show that the system has good dynamic performance with the proposed control law. The control provides theoretical guidance for optimal power tracking control law application for hydraulic wind turbine.
21
Hodgson, P. G., and J. K. Raine. "Computer Simulation of a Variable Fill Hydraulic Dynamometer: Part 2: Steady State and Dynamic Open-Loop Performance." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 206, no. 1 (January 1992): 49–56. http://dx.doi.org/10.1243/pime_proc_1992_206_094_02.
Повний текст джерелаАнотація:
Part 1 of this paper presented a theoretical model for the torque absorption and energy dissipation processes in a variable fill Froude-type hydraulic dynamometer. Effects of working compartment geometry changes on steady state running full torque absorption performance were also shown. Part 2 presents both steady state and dynamic computer simulations of an engine-dynamometer system under open-loop control. Comparisons between model simulations and test bed data show that the dynamic model reproduces both the negative torque-speed dynamometer characteristics and other transient phenomena that occur under real open-loop partial fill conditions. Requirements of control systems to modify this behaviour and ensure stable set point holding are introduced. Part 3 of the paper will deal with the simulation of the engine-dynamometer system under closed-loop control.
22
Ma, Guoliang, Kaixian Ba, Zhiwu Han, Zhengguo Jin, Bin Yu, and Xiangdong Kong. "A Mathematical Model Including Mechanical Structure, Hydraulic and Control of LHDS." Robotica 39, no. 7 (January 20, 2021): 1328–43. http://dx.doi.org/10.1017/s0263574720001204.
Повний текст джерелаАнотація:
SUMMARYIn this paper, mathematical models of kinematics, statics and inverse dynamics are derived firstly according to the mechanical structure of leg hydraulic drive system (LHDS). Then, all the above models are integrated with MATLAB/Simulink to build the LHDS simulation model, the model not only considers influence of leg dynamic characteristics on hydraulic system but also takes into account nonlinearity, variable load characteristics and other common problems brought by hydraulic system, and solves compatibility and operation time which brought by using multiple software simultaneously. The experimental results show the simulation model built in this paper can accurately express characteristics of the system.
23
Wang, Jing Fu, Li Hua Liang, and Lu Yang Wang. "Research on the Low Velocity Accuracy Control of the Direct Drive Volume Control Electro-Hydraulic Servo System." Applied Mechanics and Materials 419 (October 2013): 623–29. http://dx.doi.org/10.4028/www.scientific.net/amm.419.623.
Повний текст джерелаАнотація:
The Direct Drive Volume Control (DDVC) Electro-hydraulic Servo System is a new Electro-hydraulic Servo System. With the development of its application, how to improve the trajectory tracking precision of the DDVC system in low velocity motions becomes more important in the field. So that, the level of the low velocity characteristic impacted the system become to an important subject. In this paper, the mathematical mode of AC asynchronism motor Direct Torque Control was established, and the simulation mode was built. In addition, the idealized model of the DDVC system which based on united simulation of AMEsim/Simulink was established, simulation was executed. In order to make the research available, the low velocity characteristic of the DDVC system was also analyzed, and the low velocity characteristic simulation model was built. Computer simulation validated that the friction is seriously influenced the system performance when the system working on the low velocity mode. An integral back stepping adaptive control law is designed to realize the friction compensation and load disturbance estimation. From the Lyapunov theory, the stability of the closed-loop system is proved. Simulation results show that LuGre friction in servo systems will lead to the effect of limit cycles and stick-slip. Moreover, the proposed compensation method can greatly reduce the effect and improve the system tacking accuracy and robustness.
24
Zhang, Yi, Hongyang Zhang, Kuidong Gao, Qingliang Zeng, Fansheng Meng, and Jingyi Cheng. "Research on Intelligent Control System of Hydraulic Support Based on Position and Posture Detection." Machines 11, no. 1 (December 27, 2022): 33. http://dx.doi.org/10.3390/machines11010033.
Повний текст джерелаАнотація:
In the study of coal mining, the position and posture, the working status, and the straightness of the hydraulic support are critical to the safety of the coal mine. To detect and control the position of a hydraulic support, a model for solving the self-position and posture and a model for solving the relative position and pose of a hydraulic support based on the principle of three points determining a plane in space were established. Then, with the help of particle swarm optimization algorithm and Bang-Bang control algorithm, the hydraulic support position and the posture detection and control system are constructed. Finally, according to the requirements of sensor data collection and online monitoring of the position and posture of hydraulic support, a hydraulic support posture detection and control system is developed, and the simulation experiments of hydraulic support cylinder movement sample collecting, hydraulic support following motion and hydraulic support independent following machine are carried out on the self-developed three-machine intelligent control simulation experiment platform of the working face. However, the test under this simulation platform did not add the load of the top beam. The results show that the self-pose solution model and the relative-pose solution model of the hydraulic support can be used to quickly monitor the position and posture of the hydraulic support group. In the hydraulic support cylinder following motion movement, the largest following error of each cylinder is the balance cylinder, and its maximum error is 2.6 mm. In the hydraulic support independent following machine simulation, the maximum motion error of the support base is 2.2 mm. The position and posture detection and control system developed for hydraulic support can realize accurate detecting and control the position and posture of hydraulic support, as well as meet the requirements for industrial applications.
25
Hodgson, P. G., and J. K. Raine. "Computer Simulation of a Variable Fill Hydraulic Dynamometer Part 3: Closed-Loop Performance." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 206, no. 5 (September 1992): 327–36. http://dx.doi.org/10.1243/pime_proc_1992_206_135_02.
Повний текст джерелаАнотація:
An engine and hydraulic dynamometer system is dynamically modelled with two different control systems. The closed-loop system behaviour is studied for a hydromechanical back-pressure water outlet valve and for an electrohydraulic servo-controlled water outlet valve. This is an extension of the open-loop dynamic model of Part 2, which incorporates the mathematical model of the torque absorption processes in a variable fill Froude-type hydraulic dynamometer presented in Part 1. The models are based on a system of first-order differential equations which are solved numerically using an Adams predictor corrector method. Both the analogue hack-pressure valve and digital servo-controlled valve are accurately simulated. In both cases the influence of the dynamic dynamometer model on the transient response is apparent. Variation in digital control system parameters across the operating envelope illustrates the non-linearity of dynamometer response. The computer model and experimental results are compared and implications of the closed-loop behaviour discussed.
26
Zheng, Gang, Bin Ma, Zhe Yang, and Ding Liu. "Design of a Semi-Real Simulation Platform for the Cold Rolling Mill." Applied Mechanics and Materials 395-396 (September 2013): 1243–47. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.1243.
Повний текст джерелаАнотація:
We designed a semi-real simulation platform for the cold rolling mill that was composed of Simulation Computer, Simulation System of Field Signal, AGC Control System, Console of Rolling Mill and the Main Control Computer, and built the mathematical models in the Simulation Comuter, for the hydraulic servo system, rolling force and thickness of strip material. In the platform, the Simulation System of Field Signal output the simulation data as standard sensor signal; the AGC Control System is the same as that used in real rolling mill system. We simulated the milling process of real rolling mill system at this platform using the field-recorded online data. The differences between simulation results and those in real system were small. Simulation results show that this simulation platform can be used in the research and optimization of rolling mill control system.
27
Sepehri, N., P. D. Lawrence, F. Sassani, and R. Frenette. "Resolved-Mode Teleoperated Control of Heavy-Duty Hydraulic Machines." Journal of Dynamic Systems, Measurement, and Control 116, no. 2 (June 1, 1994): 232–40. http://dx.doi.org/10.1115/1.2899215.
Повний текст джерелаАнотація:
This paper addresses the control problem for a class of heavy-duty hydraulic machines in order to achieve coordinated motion control of the implement. A model and sensor-based control algorithm is proposed which is applied in conjunction with closed-loop components. The algorithm is basically a feedforward load compensating scheme which uses the measured hydraulic line pressures along with the appropriate portion of the hydraulic model to control the joint velocities. The effects of nonlinear dynamic coupling between the links, loading, coupled actuation and power limitations are compensated in this technique. The closed-loop part consists of PD components. A knowledge of some hydraulic parameters is the only requirement of this control scheme. The proposed approach has been examined through simulation and is supported by experimental evidence. The experiments were performed on a Caterpillar 215B excavator. The control program is written in the C language, running on a computer system which is interfaced between the human operator and the machine.
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Chen, Teng, Xuewen Rong, Yibin Li, Chao Ding, Hui Chai, and Lelai Zhou. "A compliant control method for robust trot motion of hydraulic actuated quadruped robot." International Journal of Advanced Robotic Systems 15, no. 6 (November 1, 2018): 172988141881323. http://dx.doi.org/10.1177/1729881418813235.
Повний текст джерелаАнотація:
A motion control approach is proposed for hydraulic actuated quadruped robots, aiming to achieve active compliance and robust motion control. The approach is designed with a structure of three layers. Servo valve-controlled asymmetric hydraulic cylinder model is established to obtain the relationship between the desired torque and the control current signal, which is the bottom layer. The middle layer is based on the virtual model of the leg for active compliance. The upper layer considers the torso posture and velocity into planning the foot trajectories based on the spring loaded inverted pendulum model. Trotting gait simulations are conducted based on the proposed framework in the simulation software environment Webots. The motion control approach has been implemented on a robot prototype SCalf-II (SDU calf), where experiments have been conducted including omnidirectional trotting gait, lateral impact recovery and climbing slopes. The experiments demonstrate that the proposed approach can effectively control the hydraulic actuated robots.
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Jiang, Chenyang, Shuai Sui, and Shaocheng Tong. "Adaptive NN Control of Electro-Hydraulic System with Full State Constraints." Electronics 11, no. 9 (May 5, 2022): 1483. http://dx.doi.org/10.3390/electronics11091483.
Повний текст джерелаАнотація:
This paper presents an adaptive neural network (NN) control approach for an electro-hydraulic system. The friction and internal leakage are nonlinear uncertainties, and the states in the considered electro-hydraulic system are fully constrained. In the control design, the NNs are utilized to approximate the nonlinear uncertainties. Then, by constructing barrier Lyapunov functions and based on the adaptive backstepping control design technique, a novel adaptive NN control scheme is formulated. It has been proven that the developed adaptive NN control scheme can sustain the controlled electro-hydraulic system to be stable and make the system output track the desired reference signal. Furthermore, the system states do not surpass the given bounds. The computer simulation results verify the effectiveness of the proposed controller.
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Su, Qiying, Zhongcai Pei, and Zhiyong Tang. "Nonlinear Control of a Hydraulic Exoskeleton 1-DOF Joint Based on a Hardware-In-The-Loop Simulation." Machines 10, no. 8 (July 25, 2022): 607. http://dx.doi.org/10.3390/machines10080607.
Повний текст джерелаАнотація:
Aiming at the difficulty of debugging the exoskeleton control system driven by a hydraulic cylinder, a research method of a nonlinear control strategy for the hydraulic exoskeleton system with 1 degree of freedom (DOF) joint is proposed. Based on a hardware-in-the-loop (HIL) simulation, this method establishes the dynamic model of the 1-DOF joint system of the hydraulic driven exoskeleton, constructs the HIL simulation test platform based on the Linux real-time kernel patch, and studies the nonlinear control strategy of the 1-DOF joint system on this platform system. The control effects of the PID control algorithm and the backstepping method on nonlinear control are compared, and the controller parameters are tested on the HIL simulation platform. From the experimental results of the HIL simulation, the research method has the advantages of low cost, high efficiency of system development, safety, and reliability. It has important reference value for the development and debugging of a hydraulic exoskeleton control system.
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Wang, Yan, Wen Xia Wei, Hui Ling Han, and Ying Wang. "Groundwater Migration Modeling and Parameter Sensitivity Analysis on Contaminated Site." Advanced Materials Research 878 (January 2014): 775–81. http://dx.doi.org/10.4028/www.scientific.net/amr.878.775.
Повний текст джерелаАнотація:
Contamination control and remediation of groundwater is one of the hotness points in environmental protection field. Groundwater contamination numerical simulation is widely used for groundwater contamination transportation. In this paper, we constructed an indoor sandbox to conduct hydraulic control experiment and tracer experiment. We also set up groundwater flow model and solute transport model by computer and chose the model's key parameters for sensitivity analysis. The results indicated that the sensitivity of hydraulic conductivity was highest, which was the key parameter in the groundwater flow model. The sensitivity analysis of solute transport model parameters showed that sensitivity from large to small was: longitudinal dispersion, porosity and hydraulic conductivity. This study can obtain the main parameters in groundwater simulation model and is helpful for the construction of groundwater contamination migration model.
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Li, Lan, Jiang Ye, and Xue Fei Zheng. "The Electro-Hydraulic Proportional Control and Simulation of the Radial Piston Pump Based on Proportional-Integral-Derivative Neural Network." Advanced Materials Research 139-141 (October 2010): 1749–52. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1749.
Повний текст джерелаАнотація:
In this paper a new control method has been studied in which PID control system was integrated into the neural network. It could overcome some disadvantages such as neural network’s slow rate of convergence and PID’s difficulty in application of multivariate nonlinear systems. A controller of the Electro-hydraulic proportional control stroking mechanism for radial piston pump was designed based on the PID neural network control algorithm. The system responses of system variable control signal of system track were achieved by computer simulation. It was found by PIDNN that the control system could reach steady state in a shorter time, compared with PID control system response time by 65% to 80%. The simulation results showed that the controller for the Electro-hydraulic proportional Radial Piston Pump based PID neural network control algorithm would have a good controlling performance.
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Duviella, Eric, Pascale Chiron, and Philippe Charbonnaud. "Hybrid Control Accommodation forWater-asset Management of Hydraulic Systems Subjected to Large Operating Conditions." International Journal of Computers Communications & Control 2, no. 3 (September 1, 2007): 241. http://dx.doi.org/10.15837/ijccc.2007.3.2357.
Повний текст джерелаАнотація:
The Hybrid Control Accommodation (HCA) strategy was proposed to improve the water-asset management of hydraulic systems by resource allocation and setpoint assignment. Hydraulic system dynamics are taken into account during the setpoint assignment step which consists in controlling gates for large operating conditions. For hydraulic systems subjected to strong disturbances, transfer delays are variable, thus different operating modes must be considered. A multimodelling method, associated to a selection technique of transfer delay, allowing for the determination of the number of models, is proposed. The simulation results on the first reach of the Neste canal show the effectiveness of the HCA strategy.
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Zhong, Bao Hua. "The Brake Guards against Holds the Dead (ABS) Teaching Laboratory Bench the Development." Advanced Materials Research 779-780 (September 2013): 1102–5. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.1102.
Повний текст джерелаАнотація:
This article studied one kind of automobile brake to guard against holds the dead examination test platform structure, the control design plan, and guarded against to the brake holds the dead system structure principle teaching to carry on the thorough discussion.This system wheel uses the hydraulic pressure actuation, through the adjustment hydraulic pressure parameter may in the simulation different vehicle speed, the different coefficient of adhesion road surface the automobile apply the brake well when ABS system working condition; Through the animation broadcast system, the brake hydraulic pressure test system and designs and so on vehicle speed examination system, can real, the comprehensive development ABS system work process; The breakdown establishment and the elimination system use in to the brake guard against hold the dead system to carry on the breakdown diagnosis and the elimination simulation training.This laboratory bench main innovation spot is the wheel uses the hydraulic pressure actuation; Uses the brake pressure parameter control animation broadcast; Uses the computer to carry on the breakdown establishment.
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KITAHARA, Takuo, Yoshiaki SATO, Masataka SHIRAKASHI, Akira OKADA, and Teruyoshi UMEMURA. "Development of snow-fraction control technique in hydraulic conveying of snow. Part II: Computer simulation." Journal of the Japanese Society of Snow and Ice 54, no. 3 (1992): 259–67. http://dx.doi.org/10.5331/seppyo.54.259.
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Liu, Zengguang, Linfei Li, Daling Yue, Liejiang Wei, Chao Liu, and Xiukun Zuo. "Dynamic Performance Improvement of Solenoid Screw-In Cartridge Valve Using a New Hybrid Voltage Control." Machines 10, no. 2 (January 29, 2022): 106. http://dx.doi.org/10.3390/machines10020106.
Повний текст джерелаАнотація:
Digital hydraulic technology as an emergent and important branch of fluid power offers good prospects for intelligence, integration, and energy saving of hydraulic systems. The high-speed on-off valve (HSV) that is a critical component of digital hydraulics has the drawbacks of specific design, narrow scope of application and high price compared to the commercial solenoid screw-in cartridge valve (SCV) widely used in the hydraulic industry at present. In this paper, a hybrid voltage control strategy composed of the preloading voltage, positive pulse voltage, holding voltage and negative pulse voltage is proposed to enhance the dynamic characteristics of the SCV, which makes it meet the demands of the digital hydraulics and achieve the end of replacing the HSV. Based on the structural analysis of the SCV, a mathematical model of the SCV is deduced. Subsequently, the simulation model of the SCV is developed in AMESim and validated by experimental measurements. The effects of the different duty ratios of the preloading voltage and holding voltage on the dynamic characteristics of SCV are studied, and the dynamic responses of the SCV under the normal voltage, positive and negative pulse and hybrid voltage control strategies are compared. The simulation results indicate that the increment of the preload voltage duty ratio and the reduction of the holding voltage duty ratio are conducive for decreasing the total opening and closing time of the SCV, especially the opening delay and closing delay time. The hybrid voltage control proposed has a better effect in dynamic characteristics than the other two strategies, using which the total opening time of the SCV reduces by 74.24% (from 29.5 ms to 7.60 ms), and the total closing time is drastically squeezed by 92.06% (from 136 ms to 10.8 ms). This provides a technical reference for improving the dynamic response speed of SCVs and popularizing digital hydraulic technology.
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Tang, Punan, Alan B. Palazzolo, Albert F. Kascak, and Gerald T. Montague. "Electromechanical Modeling of Hybrid Piezohydraulic Actuator System for Active Vibration Control." Journal of Dynamic Systems, Measurement, and Control 119, no. 1 (March 1, 1997): 10–18. http://dx.doi.org/10.1115/1.2801199.
Повний текст джерелаАнотація:
Electromechanical modeling of a hybrid piezohydraulic actuator system for active vibration control was developed. The transfer function of piezoelectric actuator was derived from the electromechanical potential energy law. This transfer function represents the dynamic relationship between input electric voltage and piezoelectric actuator displacement. The hydraulic actuator was characterized by impedance matching in which its transfer functions were experimentally determined. The transfer functions were transformed into a state-space representation, which is easily assembled into an active vibration control (AVC) closed-loop simulation. Good correlation of simulation and test was achieved for the hybrid system. A closed-loop dynamic simulation for imbalance response with/without AVC of a spinning rotor test rig at NASA Lewis was performed and showed excellent agreement with test results. The simulation couples the piezoelectric, hydraulic, and structural (rotor) components.
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Dindorf, Ryszard, and Piotr Wos. "Energy-Saving Hot Open Die Forging Process of Heavy Steel Forgings on an Industrial Hydraulic Forging Press." Energies 13, no. 7 (April 2, 2020): 1620. http://dx.doi.org/10.3390/en13071620.
Повний текст джерелаАнотація:
The study deals with the energy-saving process of hot open die elongation forging of heavy steel forgings on an 80 MN industrial hydraulic forging press. Three innovative energy-saving power supply solutions useful for industrial hydraulic forging presses were analyzsed. The energy-saving power supply of hydraulic forging presses consists in reducing electricity consumption by the electric motor driving the pumps, reducing the noise emitted by pumps and reducing leaks in hydraulic piston cylinders. The predicted forging force as a function of heavy steel forging heights for various deformation temperatures and strain rates was determined. A simulation model of the 80 MN hydraulic forging press is presented, which is useful for determining the time-varying parameters during the forging process. An energy-saving control for the hydraulic forging press based on the forging process parameters’ prediction has been developed. Real-time model predictive control (MPC) was developed based on multiple inputs multiple outputs (MIMO), and global predictive control (GPC). The GPC has been implemented in the control system of an 80 MN industrial hydraulic forging press. The main advantage of this control system is the repeatability of the forging process and minimization of the size deviation of heavy large steel forgings
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Jia, Zhi Xuan, Hui Gang Zhang, and Jie Li. "Simulation of Hydraulic Semi-Active Suspension System Based on the Adaptive Fuzzy Control." Applied Mechanics and Materials 48-49 (February 2011): 1065–68. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.1065.
Повний текст джерелаАнотація:
According to vehicle suspension structure, a 2-DOF (degrees of freedom) semi-active hydraulic suspension model for 1/4 vehicle is built. Fuzzy control as a result of simple modeling, with high precision control and non-linear adaptive advantages of the vehicle active suspension control strategy, has been a wider application. In this paper, the body’s speed and acceleration were selected for the fuzzy controller inputs, damper output, to realize the semi-active suspension control. Taking some type of vehicle as the simulation object, this paper uses Matlab/Simulink for computer simulation in the same road conditions. And the performance parameters of improving vehicle vertical vibration are compared to the passive suspension. The results show that the semi-active suspension system strategy by fuzzy control can obviously improve the comfortable and safe ride.
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Dobson, A., A. P. Roskilly, and E. Jones. "Development of a model and simulation of a water hydraulic manipulator joint." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 217, no. 2 (June 1, 2003): 71–78. http://dx.doi.org/10.1243/147509003321921328.
Повний текст джерелаАнотація:
Increasingly, governments are passing stringent laws on the use of environmentally damaging substances, and the success of alternative fluids has been short lived as the limitations of each has become evident which will ultimately result in their redundancy. History has shown that water is a more than viable fluid for use in hydraulic machinery, taking the place of oil and competing favourably with other power media. This paper details the development of a MATLAB-based computer simulation of the dynamic operation of a water hydraulic actuation system used in the development of a reduced rule self-organizing fuzzy logic control system.
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Nie, Yong, Jiajia Liu, Gang Liu, Litong Lyu, Jie Li, and Zheng Chen. "Force Tracking Impedance Control of Hydraulic Series Elastic Actuators Interacting with Unknown Environment." Mathematics 10, no. 18 (September 18, 2022): 3383. http://dx.doi.org/10.3390/math10183383.
Повний текст джерелаАнотація:
Force tracking control for hydraulic series elastic actuators (SEAs) is the demand in robots interacting with the surrounding world. However, the inherent nonlinearities and uncertainties of the hydraulic system, as well as the unknown environment, make it difficult to achieve precise contact force control of hydraulic SEAs. Therefore, in this study, force tracking impedance control of hydraulic SEAs is developed considering interaction with an unknown environment in which the force tracking performance can be guaranteed in theory. Based on the typical force tracking impedance frame, the force tracking performance is improved by introducing backstepping control into the inner position controller to deal with the high-order nonlinear dynamics of the hydraulic SEA. In addition, the environment parameters are also estimated online by the adaptive method. Finally, comparative simulation is conducted with different interacting environments, which verifies the advantages of the proposed method.
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Zhang, Bin, Shuang Wang, Yuting Liu, and Huayong Yang. "Research on Trajectory Planning and Autodig of Hydraulic Excavator." Mathematical Problems in Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/7139858.
Повний текст джерелаАнотація:
As the advances in computer control technology keep emerging, robotic hydraulic excavator becomes imperative. It can improve excavation accuracy and greatly reduce the operator’s labor intensity. The 12-ton backhoe bucket excavator has been utilized in this research work where this type of excavator is commonly used in engineering work. The kinematics model of operation device (boom, arm, bucket, and swing) in excavator is established in both Denavit-Hartenberg coordinates for easy programming and geometric space for avoiding blind spot. The control approach is based on trajectory tracing method with displacements and velocities feedbacks. The trajectory planning and autodig program is written by Visual C++. By setting the bucket teeth’s trajectory, the program can automatically plan the velocity and acceleration of each hydraulic cylinder and motor. The results are displayed through a 3D entity simulation environment which can present real-time movements of excavator kinematics. Object-Oriented Graphics Rendering Engine and skeletal animation are used to give accurate parametric control and feedback. The simulation result shows that a stable linear autodig can be achieved. The errors between trajectory planning command and simulation model are analyzed.
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Bartenev, Ivan, Leonid Bukhtoyarov, Petr Popikov, and A. Pridvorova. "CAD SIMULATOR MODEL OF A CUTTER." Forestry Engineering Journal 10, no. 1 (April 6, 2020): 153–60. http://dx.doi.org/10.34220/issn.2222-7962/2020.1/20.
Повний текст джерелаАнотація:
When caring for forest crops, it is necessary to prune the branches. Cutting of top branches is carried out in nurseries, removal of shrubs - on clearings, the formation of crowns - in forest shelterbelts. It is difficult for the operator to simultaneously control several hydraulic cylinders and maintain the required position of the working body. It becomes possible to automate the process of pruning branches with the development of digital means of visual and automatic
control. It is necessary to determine the control actions on the hydraulic cylinders of the branch cutter to automate the work of the operator. Modern technological equipment is designed in computer-aided design (CAD) systems. It enables using a numerical method to conduct a computer experiment on a simulation model. The design of the cutter in Solidworks have
been made. A simulation model has been compiled. The simulation model takes into account geometric, kinematic and inertial parameters of the cutter chains. The movement of the cutter working body from the transport position to the working one has been studied. Virtual displacement sensors have been installed on the chains in the Motion Solidworks
module, and cutter paths have been obtained. The resulting control actions can be used as an input parameter for simulation models in other mathematical environments, and when creating prototypes of cutting control mechanisms
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Ning, Xizhan. "Mixed Sensitivity-Based Robust H∞ Control Method for Real-Time Hybrid Simulation." Symmetry 13, no. 5 (May 10, 2021): 840. http://dx.doi.org/10.3390/sym13050840.
Повний текст джерелаАнотація:
Real-time hybrid simulation (RTHS), dividing the emulated structure into numerical substructures (NS) and physical substructures (PS), is a powerful technique to obtain responses and then to assess the seismic performance of civil engineering structures. A transfer system, a servo-hydraulic actuator or shaking table, is used to apply boundary conditions between the two substructures. However, the servo-hydraulic actuator is inherently a complex system with nonlinearities and may introduce time delays into the RTHS, which will decrease the accuracy and stability of the RTHS. Moreover, there are various uncertainties in RTHS. An accurate and robust actuator control strategy is necessary to guarantee reliable simulation results. Therefore, a mixed sensitivity-based H∞ control method was proposed for RTHS. In H∞ control, the dynamics and robustness of the closed-loop transfer system are realized by performance weighting functions. A form of weighting function was given considering the requirement in RTHS. The influence of the weighting functions on the dynamics was investigated. Numerical simulations and actual RTHSs were carried out under symmetric and asymmetric dynamic loads, namely sinusoidal and earthquake excitation, respectively. Results indicated that the H∞ control method used for RTHS is feasible, and it exhibits an excellent tracking performance and robustness.
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Fang, Delei, Junhong Yang, Jianzhong Shang, Zhuo Wang, and Yong Feng. "A Novel Energy-Efficient Wobble Plate Hydraulic Joint for Mobile Robotic Manipulators." Energies 11, no. 11 (October 26, 2018): 2915. http://dx.doi.org/10.3390/en11112915.
Повний текст джерелаАнотація:
At present, mobile robotic manipulators have been greatly developed. However, these further promotions are limited by a low load capacity and short operation time. The above problems can be improved by using a hydraulic drive mode and increasing the system energy efficiency. In this paper, a novel energy-efficient wobble plate hydraulic joint is presented, which has the characteristics of having a small size, lightweight, large load capacity, and high energy efficiency. Based on the efficiency analysis in traditional robotic manipulators, this paper presents a novel hydraulic joint with a multi-chamber drive structure. Kinematics model and dynamics model are both established for the analysis of the mechanical characteristics, and the functional relationship between the input and output is depicted by numerical simulation. Based on the structural characteristics and control principle, the load matching controller is designed and specific control processes are formulated. Combined with a strategy of load matching, the servo control system is established and the energy-saving effect is verified by simulation. The result shows that the wobble plate hydraulic joint can change connections between a high-pressure circuit and different working chambers, which realizes the match between the output torque and load torque. With the load matching controller, the energy consumption of the wobble plate joint is greatly reduced, which contributes to a considerably improved energy efficiency. The research in this paper not only lays a theoretical foundation for the development of a wobble plate hydraulic joint, but also provides guidance for the improvement of the hydraulic system energy efficiency in mobile robotic manipulators.
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Dmitriev, Dmitry S., and Alexander A. Uchevatkin. "Mathematical simulation in the system of safety monitoring of hydraulic structures and automated control systems of stress-strain state." Vestnik MGSU, no. 12 (December 2021): 1582–91. http://dx.doi.org/10.22227/1997-0935.2021.12.1582-1591.
Повний текст джерелаАнотація:
Introduction. The article describes the features of the systems for monitoring the safety of hydraulic structures, which are based on the apparatus of mathematical and computer modeling. Prospects for the use of automated control systems for the stress-strain state of building structures of hydraulic structures are considered.
Materials and methods. An analytical review of foreign examples of the implementation of monitoring systems for high-pressure hydraulic structures based on mathematical models is presented. The results of computational studies of the Zagorsk PSPP complex within the framework of the hardware and software complex for safety monitoring are shown. The concept of automated stress-strain state control systems is described.
Results. The advantages and limitations of widely used, domestic and foreign automated information and diagnostic systems are outlined. On specific examples of the integration of numerical models of hydraulic structures into integrated systems for monitoring the safety of hydraulic structures, methods of expanding the capabilities of monitoring systems in terms of analyzing the stress-strain state of structures and predictive estimates are demonstrated. Insufficient elaboration of the issues of management of the stress-strain state of structures is noted, but the need to develop special structural elements with variable parameters to influence the stress-strain state of hydraulic structures is substantiated.
Conclusions. The data presented in the article confirm the need to develop systems for monitoring the safety of hydraulic structures based on complex, multiphysics mathematical models, which can significantly expand the functionality of monitoring systems and, as a result, improve the safety of hydraulic structures. The analysis of world experience indicates the growing lag of the Russian hydropower industry in terms of the integration of mathematical models into the safety monitoring systems for hydraulic structures, which obviously requires additional research and practical work in this area.
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Zhu, Chenhui, Hongmei Zhang, Wanzhang Wang, Kang Li, and Wanru Liu. "Robust control of hydraulic tracked vehicle drive system based on quantitative feedback theory." International Journal of Distributed Sensor Networks 16, no. 2 (February 2020): 155014772090783. http://dx.doi.org/10.1177/1550147720907832.
Повний текст джерелаАнотація:
To improve the control precision of the drive system of hydraulic tracked vehicles, we established a mathematical model of the drive system based on the analysis of structural characteristics of the high-clearance hydraulic tracked vehicles and the dual-pump dual-motor drive system and developed a control strategy based on the quantitative feedback theory. First, the mutual independence of the two motor channels was achieved through channel decoupling. Then, the loop-shaping controller and the pre-filter were designed for the two channels. The result of a simulation experiment indicates that the proposed control method is very effective in suppressing external uncertainties and smoothening the speed-switching process of the hydraulic motor. Finally, an hydraulic tracked vehicle steering experimental test was carried out. The results show that under two different steering modes, the maximum standard deviation of the output speeds of the inner and outer motors of the hydraulic tracked vehicle is only 0.42, which meets the performance requirement on the hydraulic motor speed. The average steering track radii of the geometric centers of the inner and outer tracks are 1.828 and 0.033 m, respectively, and the relative errors are 1.56% and 3.19%, respectively. This demonstrates that the proposed control method achieves satisfactory results in the robust control of the hydraulic tracked vehicle drive system. It provides some references for the future control research of the hydraulic servo drive system of the high-clearance hydraulic tracked vehicles.
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Zhou, Rulin, Lingyu Meng, Xiaoming Yuan, and Zishi Qiao. "Research and Experimental Analysis of Hydraulic Cylinder Position Control Mechanism Based on Pressure Detection." Machines 10, no. 1 (December 21, 2021): 1. http://dx.doi.org/10.3390/machines10010001.
Повний текст джерелаАнотація:
This paper studies the precise position control of the hydraulic cylinder in the hydraulic support. The aim of this paper is to develop a method of hydraulic cylinder position control based on pressure and flow coupling, which takes the coupling feedback of load and flow into account, especially in the scene of cooperative control under the condition of multiple actuators and variable load. This method solves the problems of slow movement and sliding effect of hydraulic support in the traditional time-dependent hydraulic position control, as well as better realizes the intelligent and unmanned development of the fully mechanized mining face. First, based on the flow continuity equation and Newton Euler dynamic equation, the flow and stroke control model with the input and output pressure of hydraulic cylinder is established. Then, the effectiveness and correctness of the control model are verified by the comparison between the hydraulic system simulation software, AMESim, and the experiment. Finally, a test system is built. When the system pressure is large than 10 MPa, the error between the data determined by the fitting algorithm and the actual detection data is within 5%, which verifies the effectiveness of the theory and simulation model.
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LIU, WenZheng, Jun YAO, and QingDong ZENG. "Numerical simulation of hydraulic fracture propagation in deep reservior." SCIENTIA SINICA Technologica 49, no. 2 (December 6, 2018): 223–33. http://dx.doi.org/10.1360/n092017-00207.
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Deghal Cheridi, Amina Lyria, Amel Dadda, Abdellah Bouam, and Ahmed Dahia. "Transient Simulation of an Industrial Steam Boiler." Algerian Journal of Signals and Systems 7, no. 2 (June 30, 2022): 77–83. http://dx.doi.org/10.51485/ajss.v7i2.164.
Повний текст джерелаАнотація:
The safety analysis of an industrial installation is extensively based on modeling and simulation. However, the analysis of simulation using realistic computer codes like RELAP5/Mod3.2 will help understand thermal-hydraulic behavior of an installation during normal and accidental conditions. In a steam boiler operation, it is very important to evaluate numerous accident scenarios under real plant conditions. One of the main accidental transients is tube rupture of steam boiler. The main objective of this study consists toinvestigate the behavior of an industrial steam boiler installed in the complex of natural gas liquefaction (LNG) at Skikda in Algeria during feed water line break accident. A RELAP5 model was set up to simulate the entire system, the model represents all steam boiler components to be suitable for the analysis of the several accidents. The control and regulation systems are also considered. The model was qualified against the steam boiler data at steady-state conditions. As seen from the results, a good agreement was obtained. The transient simulation results show that the thermal-hydraulic code correctly predicts the behavior of the main steam boiler parameters and how the control system, when required, can successfully mitigate the accident.