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1
Maltezos, Evangelos, Michail Papoutsidakis, and V. J. De Negri. "A STUDY OF HYDRAULIC ACTUATOR CONTROL METHODS IN SIMULATION." International Journal of Engineering Applied Sciences and Technology 04, no. 05 (October 1, 2019): 455–62. http://dx.doi.org/10.33564/ijeast.2019.v04i05.066.
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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.
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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.
3
Domagała, Mariusz, Hassan Momeni, Joanna Fabis-Domagała, Mariusz Krawczyk, Grzegorz Filo, and Saeed Bikass. "Numerical Simulation of Fluid Flow inside the Flow Control Valve." Quality Production Improvement - QPI 1, no. 1 (July 1, 2019): 394–99. http://dx.doi.org/10.2478/cqpi-2019-0053.
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Abstract Hydraulic valves are widely used in many branches and they are still developed and improved. Due to the problem with verification of flow phenomena which appears during valves operation numerical simulations methods are tools which allows to improved valves design. This paper presents numerical simulation of fluid flow inside flow control valve.
4
Jensen, Konrad Johan, Morten Kjeld Ebbesen, and Michael Rygaard Hansen. "Adaptive Feedforward Control of a Pressure Compensated Differential Cylinder." Applied Sciences 10, no. 21 (November 5, 2020): 7847. http://dx.doi.org/10.3390/app10217847.
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This paper presents the design, simulation and experimental verification of adaptive feedforward motion control for a hydraulic differential cylinder. The proposed solution is implemented on a hydraulic loader crane. Based on common adaptation methods, a typical electro-hydraulic motion control system has been extended with a novel adaptive feedforward controller that has two separate feedforward states, i.e, one for each direction of motion. Simulations show convergence of the feedforward states, as well as 23% reduction in root mean square (RMS) cylinder position error compared to a fixed gain feedforward controller. The experiments show an even more pronounced advantage of the proposed controller, with an 80% reduction in RMS cylinder position error, and that the separate feedforward states are able to adapt to model uncertainties in both directions of motion.
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Huang, Zhipeng, Yuepeng Xu, Wang Ren, Chengwei Fu, Ruikang Cao, Xiangdong Kong, and Wenfeng Li. "Design of Position Control Method for Pump-Controlled Hydraulic Presses via Adaptive Integral Robust Control." Processes 10, no. 1 (December 23, 2021): 14. http://dx.doi.org/10.3390/pr10010014.
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This paper takes the position control performance of pump-controlled hydraulic presses as the research object. The control methods are designed respectively for the two motion stages of rapid descent and slow descent of hydraulic presses in order to improve the control performance of the system. First of all, the accuracy model of the pump-controlled hydraulic presses position servo system (the pump-controlled hydraulic presses position servo system, which is called PCHPS) and its MATLAB/Simulink simulation platform are established. Based on the theoretical analysis and experimental data, the interference factors affecting the tracking accuracy and positioning accuracy of the PCHPS are analyzed. Then, an adaptive integral robust control (the adaptive integral robust control, which is called AIRC) for PCHPS is designed to reduce the influence of nonlinear factors on the system, and the effectiveness of the controller is verified by simulation. Finally, the position control experiment of PCHPS is designed, and the experimental results show that the AIRC can effectively reduce nonlinear factors such as unknown interference in the slow-down stage of the system. The positioning accuracy is raised to within 0.008 mm, which improves the process level of the hydraulic presses.
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Taylor, S. E. M., D. N. Johnston, and D. K. Longmore. "Modelling of transient flow in hydraulic pipelines." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 211, no. 6 (September 1, 1997): 447–55. http://dx.doi.org/10.1243/0959651981540035.
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This paper describes a method of modelling time-varying flow in hydraulic pipelines which may be incorporated into time domain simulations of hydraulic systems operating with variable time steps. A previously reported finite element method is extended. New approximations to frequency-dependent friction for laminar and turbulent flow are presented. These are applicable to this finite element method as well as the method of characteristics and finite difference methods. Simulation results are compared against theory and excellent agreement is found.
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Liu, Rongsheng, Zekai Wang, Pengshuo Jia, Guishan Yan, Tiangui Zhang, Chunyu Jia, and Gexin Chen. "Research on Pressure Control of an Electro-Hydraulic Servo System Based on Sliding-Mode Variable-Structure Direct Torque Control." Processes 11, no. 1 (December 29, 2022): 92. http://dx.doi.org/10.3390/pr11010092.
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Taking a direct-drive volume control (DDVC) electro-hydraulic servo system as the research object and aiming at the problems of the servo motor torque fluctuation, high-precision system pressure control, and dynamic response of the system, based on traditional motor direct torque control (DTC), a motor direct torque control method based on a sliding-mode variable structure is proposed to control the system pressure. The motor torque loop is part of the inner control loop and has a rapid dynamic response speed, resulting in higher pressure control accuracy. A nonlinear mathematical model was established for the DDVC electro-hydraulic servo system. The switch meter hysteresis controller in the traditional DTC system was replaced with space vector pulse-width modulation technology. Then, the PID control module in space vector modulation technology was replaced with high-order sliding-mode variable-structure control. Through the coupling relationship between the electric machine and the constant-displacement pump, the pressure can be controlled with high precision using motor torque control. Finally, using the MATLAB/Simulink simulation platform and the DDVC electro-hydraulic servo system simulation model, the proposed theoretical approach to torque control was verified on the basis of simulations and experiments, and the performance with regard to pressure control in the hydraulic system was observed. The simulation and experimental results show that the designed torque control is able to effectively reduce the motor torque fluctuation and improve the dynamic response characteristics of the system. The system pressure control is superior to traditional pressure control methods based on speed regulation, and it has higher control accuracy and a better dynamic response.
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Zhao, Rui Ying, and Xin Wang. "Research on Power Adaptive Control Method for Hydraulic Motor Grader Based on Simulink/AMESim." Applied Mechanics and Materials 135-136 (October 2011): 793–99. http://dx.doi.org/10.4028/www.scientific.net/amm.135-136.793.
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A method of power adaptive control for hydraulic motor graders is provided, including the dynamic regulation methods of pump and motor and realization algorithms related. The simulation models of hydraulic transmission system and the control system are established in AMESim and Simulink respectively. By using these two softwares, the models are co-simulated. The co-simulation results verify the feasibility and effectiveness of the control system.
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Zhao, Guo Hua, and Jian Guo Chen. "Applications Research on the Synchronization Control of Multi Hydraulic Cylinders of Dump Truck." Applied Mechanics and Materials 220-223 (November 2012): 1653–56. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1653.
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Abstract: In this article, a three-hydraulic-cylinders synchronization control model of the hydraulic system of a large dump truck is discussed and the proportional integral (PI) control is used for the hydraulic system. Simulation and performances comparison between the improved and unimproved system have been done by using MATLAB 7.10. To meet different practical engineering requirements, different control methods are designed and selected，aiming to the practical purpose.
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Huang, Qitao, Peng Wang, Yudong Liu, and Bowen Li. "Modeling and Simulation of Hydraulic Power Take-Off Based on AQWA." Energies 15, no. 11 (May 26, 2022): 3918. http://dx.doi.org/10.3390/en15113918.
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The AQWA software is often used to perform hydrodynamic analysis, and it is highly convenient for performing frequency domain simulations of Pelamis-like wave energy converters. However, hydraulic power take-off (PTO) must be simplified to a linear damping model or a Coulomb torque model when performing a time domain simulation. Although these simulation methods can reduce the computational complexity, they may not accurately reflect the energy capture characteristics of the hydraulic PTO. By analyzing system factors such as the flow and pressure of each branch of the hydraulic PTO, the output torque of the hydraulic cylinder to the buoy, and the electromagnetic torque of the generator, a relatively complete hydraulic PTO model is obtained, and the model is applied to AQWA using the FORTRAN language. Comparing and analyzing the simulation results of the linear damping model, the Coulomb torque model, and the hydraulic PTO, we found that the simulation results obtained by the linear damping model are quite different from those of the hydraulic PTO, while the torque characteristics, kinematic characteristics and energy capture characteristics of the Coulomb torque model are closer to those of the hydraulic PTO model. Therefore, it is more appropriate to simplify hydraulic PTO to a Coulomb torque model based on AQWA.
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Na, Qi, Guosheng Feng, and Tixian Tian. "Real-Time Leak Detection in High Frequency Hydraulic Cylinder Based on Intelligent Control." Wireless Communications and Mobile Computing 2022 (September 25, 2022): 1–8. http://dx.doi.org/10.1155/2022/4753328.
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Most of the existing hydraulic cylinder internal leakage detection methods are laboratory testing methods, mainly the pressure-holding method, measurement of hydraulic cylinder settlement method, and measuring cup measurement method. The internal leakage of the hydraulic cylinder affects the damping characteristics of the control system. Therefore, real-time internal leakage detection plays an important role in the control characteristics. This paper first proposes a wavelet analysis-based extraction of hydraulic cylinder internal leakage fault eigenvalues for analysis, that is, data processing. A convolutional neural network-based detection method is also proposed, in which the pressure signal of a chamber of a hydraulic cylinder is first obtained through simulation under four operating conditions: no leakage, small leakage, medium leakage, and large leakage. Compared to traditional modelling methods, the method overcomes the difficulties in modelling nonlinear hydraulic systems, requires only pressure signal acquisition, is simple and reliable, and is compared with traditional BP neural networks to demonstrate its superiority.
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Shen, Wei, Jihai Jiang, Xiaoyu Su, and Hamid Reza Karimi. "A new type of hydraulic cylinder system controlled by the new-type hydraulic transformer." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 12 (December 12, 2013): 2233–45. http://dx.doi.org/10.1177/0954406213515646.
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In order to enhance the efficiency of the hydraulic system, one new-type hydraulic transformer is presented in this paper. First, the basic structure and the principle of the new-type hydraulic transformer are explained. Then, the mathematical models including both the inner and outer loops are analyzed. Moreover, two kinds of control methods are discussed corresponding to the two loops, respectively. Furthermore, the proposed strategies are translated into the simulation languages, and the simulation is made in Simulink. Finally, the prototypes of new-type hydraulic transformer and the test rig are constructed to test the performance. Both the simulated and experimental results show that the new-type hydraulic transformer can be used in the practical condition, and the proposed control algorithm is suitable.
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Zhou, Wen Chao, Wei Zhou, Cun Ping Liu, and Shan Hua Xiao. "Simulation and Optimization on Dynamic Hydraulic Drawing for Spiral Bottom Shell Parts." Applied Mechanics and Materials 496-500 (January 2014): 935–38. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.935.
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The dynamic hydraulic drawing simulation is a valid method that reduces costs, increases quality and discovers hydraulic forming process problems.The simulation process of hydraulic drawing for spiral bottom brake shell parts with space surface feature was investigated and the optimal processing parameters were acquired by using Dynaform software. The results showed that model approaches, model methods, meshing and parameters setting were the foundation of hydraulic drawing simulation and the optimized control of holder force and fluid pressure were the key factors for preventing defects during hydraulic deep drawing. Meanwhile, the suitable blank shape was found good for reducing the defects of Wall Thickness Unevenness and oral flange earing, etc.
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MILECKI, Andrzej, and Dominik RYBARCZYK. "Investigations of applications of smart materials and methods in fluid valves and drives." Journal of Machine Engineering 19, no. 4 (December 20, 2019): 122–34. http://dx.doi.org/10.5604/01.3001.0013.6235.
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In the paper the investigations performed at the Division of Mechtronic Devices at Poznan University of Technology in the area of application of both: smart materials in electro-hydraulic and electro-pneumatic valves, and new methods to control of hydraulic servo drives, are presented. In a first part the piezo bender actuator is shortly described and its application in servo valve is proposed. This actuator replaced the torque motor in the available on the market servo valve. The new valve simulation model is proposed. The simulation and investigations results of the servo valve with the piezo bending actuator are included. In the next part of the paper the application of piezo tube actuator in flapper-nozzle pneumatic valve is described. The test stand and investigations results are presented. Later, in the article, the Model Following Control (MFC) and Fractional order Control (FoC) methods are described. Their application in control of electrohydraulic servo drive is proposed. Some investigations results are included in the paper, showing the advantages of those control methods.
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Guo, Xu Sheng, Quan Cai Li, and Ju Liang Xiao. "Dynamic Characteristics Simulation of the Digital Hydraulic Cylinder Based on AMESim." Advanced Materials Research 625 (December 2012): 75–78. http://dx.doi.org/10.4028/www.scientific.net/amr.625.75.
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Hydraulic transmission has a wide range of applications and attains rapid development. As the traditional methods of mathematic modeling in the design of the electro-hydraulic control system are very complex, making the design and debugging cycle of the hydraulic system longer. Thus in this paper, using the AMESim which is a senior modeling software facing engineering task design, does the modeling and simulation calculations for one kind of digital hydraulic cylinder. We get its simulation in the application of the actual working condition. At the same time, we optimize the simulation parameters and analyze the simulation results. The simulation results and analysis can provide certain reference value for the design, debugging and subsequent improvement of the digital hydraulic cylinder. According to the simulation results, it can meet different operational requirements by making appropriate compensation and adjustment in practical applications.
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Abuowda, Karem, Siamak Noroozi, Mihai Dupac, and Phil Godfry. "A dynamic model and performance analysis of a stepped rotary flow control valve." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 233, no. 9 (January 10, 2019): 1195–208. http://dx.doi.org/10.1177/0959651818820978.
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The hydraulic independent metering is an advanced actuator driving technique that allows the implementation of advanced control algorithms or methods. The main concept of independent metering is to control hydraulic actuators ports, which are the meter-in and meter-out, separately. In this article, a novel stepped rotary type valve has been developed for embedding in hydraulic independent metering systems, instead of conventional types such as poppet and spool. The insertion leads to developing different and novel control techniques, which require software-in-the-loop simulation and hardware-in-the-loop simulation of the proposed system. The paper explores the dynamic representation of this valve and defines its own performance limitations. This includes the development of a linear model comprising its two main subparts which are the stepper motor and the rotary orifice. Consequently, the linear time-invariant methods are used to explore the performance of the valve by considering the effect of different parameters namely the pressure drop, friction coefficient, damping coefficient, and bristle coefficient.
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Ren, Ziqiang, Feng Zhou, Hai Zhu, Peihao Zhang, Jiawang Chen, Peng Zhou, Lieyu Tian, Chunhu Liu, and Xiaochao Zhang. "Analysis and Research on Mobile Drilling Rig for Deep Seabed Shallow Strata." Marine Technology Society Journal 55, no. 2 (March 1, 2021): 81–93. http://dx.doi.org/10.4031/mtsj.55.2.7.
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Abstract Drilling rigs for deep seabed shallow strata are commonly used to explore ocean cobalt-rich crust resources and other fields. This paper mainly presents the structure and mechanism of a mobile drilling rig for use in acquiring seafloor cores that are up to 1.5 m in length. The software Simcenter Amesim is used to establish the mobile drilling rig's hydraulic propulsion system model, which is the basis and a core part of the rig. Moreover, closed-loop and PID (proportion-integral-differential) control methods are separately used to control the hydraulic propulsion system for simulation analysis. Comparison of the simulation results shows that the PID control method is more convincing in verifying the design rationality of the hydraulic propulsion system. In the simulation of the PID-controlled hydraulic propulsion system, the co-simulation technology of Simcenter Amesim and MATLAB/Simulink not only establishes the hydraulic and control models but also determines the relevant simulation parameters, thereby helping improve system simulation efficiency. In its verification deployment in the South China Sea, the mobile drilling rig has been operated many times at different depths, and some cores have been successfully obtained. It was also used during the 55th Voyage of China Oceanic Scientific Expedition, which was supported by the China Ocean Mineral Resources R&D Association. Several sites were explored, and a large number of cobalt-rich crust cores were obtained. Theory and sea trials are explained to support further research on the survey of abyssal resources.
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Kroll, Stefan, Geert Dirckx, Brecht M. R. Donckels, Mieke Van Dorpe, Marjoleine Weemaes, and Patrick Willems. "Modelling real-time control of WWTP influent flow under data scarcity." Water Science and Technology 73, no. 7 (December 23, 2015): 1637–43. http://dx.doi.org/10.2166/wst.2015.641.
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In order to comply with effluent standards, wastewater operators need to avoid hydraulic overloading of the wastewater treatment plant (WWTP), as this can result in the washout of activated sludge from secondary settling tanks. Hydraulic overloading can occur in a systematic way, for instance when sewer network connections are extended without increasing the WWTP's capacity accordingly. This study demonstrates the use of rule-based real-time control (RTC) to reduce the load to the WWTP while restricting the overall overflow volume of the sewer system to a minimum. Further, it shows the added value of RTC despite the limited availability of monitoring data and information on the catchment through a parsimonious simulation approach, using relocation of spatial system boundaries and creating required input data through reverse modelling. Focus was hereby on the accurate modelling of pump hydraulics and control. Finally, two different methods of global sensitivity analysis were employed to verify the influence of parameters of both the model and the implemented control algorithm. Both methods show the importance of good knowledge of the system properties, but that monitoring errors play a minor role.
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Dubonjić, LJubiša, Novak Nedić, Vojislav Filipović, and Dragan Pršić. "Design of PI Controllers for Hydraulic Control Systems." Mathematical Problems in Engineering 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/451312.
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The paper proposes a procedure for design of PI controllers for hydraulic systems with long transmission lines which are described by models of high order. Design is based on the combination of the IE criterion and engineering specifications (settling time and relative stability) as well as on the application ofD-decomposition. In comparison with some known results, the method is of graphical character, and it is very simple (solving nonlinear algebraic equations is eliminated). The paper presents the algorithm of software procedure for design of the controller. The method is compared with other methods at the level of simulation, and its superiority is shown. By applying the Nyquist criterion, it is shown that the method possesses robustness in relation to non modelled dynamics.
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Lan, Zhi Kun, Jian Su, and Heng Mei. "Study on Dynamical Simulation of Railway Vehicle Bogie Parameters Test-Bench Electro-Hydraulic Servo System." Applied Mechanics and Materials 644-650 (September 2014): 863–66. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.863.
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Dynamical mathematical model was established for accurately positioning, fast response and real-time tracing of electro-hydraulic servo control system in railway vehicle bogie parameters test system with elastic load. The model could precisely control the output of position and force of the hydraulic cylinders. Induction methods was proposed in the paper. Dynamical simulation verified the mathematical model by software simulink. Meanwhile the key factors affecting the dynamical characteristics of the system were discussed in detail. Through the simulation results, high precision is obtained in application and the need of real-time control on the railway vehicle bogie parameters test-bench is realized .
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Birajdar, Ravindra S., Appasaheb A. Keste, and Shravan H. Gawande. "Critical Hydraulic Eccentricity Estimation in Vertical Turbine Pump Impeller to Control Vibration." International Journal of Rotating Machinery 2021 (July 31, 2021): 1–11. http://dx.doi.org/10.1155/2021/6643282.
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In many applications, pumps are tested against standard specifications to define the maximum allowable vibration amplitude limits of a pump. It is essential to identify the causes of vibration and methods to attenuate the same to ensure the safe and satisfactory operation of a pump. Causes of vibration can be classified mainly into mechanical and hydraulic nature. Respective unbalance masses are the two major factors which cause dynamic effects and excitation forces leading to undesirable vibrations. In this paper, the procedure of vibration magnitude measurement of a vertical turbine pump at site and the process of dynamic balancing to measure mechanical unbalance of an impeller are explained. After that, the impact of hydraulic eccentricity on the vibration displacement of a vertical turbine pump has been explained using numerical simulation procedure based on “One-way Fluid Structure Interaction (FSI).” The experimental results from a pump at site are used to compare the numerical results. After the solver validation, the one-way FSI approach is used to find the critical hydraulic eccentricity magnitude of a vertical turbine pump impeller to limit the vibration magnitudes on motor component to less than 100 μm. From the numerical simulations, it is deduced that the critical hydraulic eccentricity should be limited to 400 μm in X and Y direction. The process can be used as a guideline procedure for limiting the hydraulic unbalance in vertical turbine pumps by limiting the hydraulic eccentricity.
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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.
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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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Li, Jun, Huanliang Li, Hongxin Cui, and Yawei Zhu. "Nonlinear dynamics characteristics and influence factors analysis of servo hydraulic cylinder." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 20 (November 6, 2017): 3629–38. http://dx.doi.org/10.1177/0954406217740166.
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Aiming at problems of vibration, impact, and noise, the nonlinear dynamic characteristics of servo hydraulic cylinder are studied by using combination of theoretical derivation and simulation experiment methods. The nonlinear effect rules of spring force and friction force are analyzed based on nonlinear dynamic theory; it can be derived that the coupling effect rules of nonlinear spring force and friction force can be described by Duffing–Van Der Pol equation. The dynamic simulation model of servo hydraulic cylinder is established by using SimHydraulics software. The numerical simulation and experiment results showed that nonlinear vibration of servo hydraulic cylinder is mainly caused by exciting force, spring force, and friction force; the system has different motion states when the parameters take different values, which lays a good foundation for the optimal designs and precise control of hydraulic cylinder.
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Han, Bin, and Hongyan Gao. "Linear Parameter-Varying Model Predictive Control for Hydraulic Wind Turbine." Actuators 11, no. 10 (October 12, 2022): 292. http://dx.doi.org/10.3390/act11100292.
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Wind speed uncertainty and measurement noise affect the control effect in hydraulic wind turbine systems. This paper proposes a model predictive control (MPC) method with a dynamic Kalman filter (KF) based on a linear parameter-varying (LPV) model to address this problem. First of all, the LPV model for a nonlinear system of a hydraulic wind turbine is established using function substitution. Then, a LPV-based KF is introduced into the MPC to provide more precise estimated results and improve the anti-interference ability of the system. According to the current condition of the hydraulic wind turbine, the method updates the Kalman state estimator at each sampling instant and computes the optimal control input by solving a quadratic programming (QP) optimization problem. The performance and the efficiency of the proposed method is validated in simulation and compared with other methods.
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Jin, Liyang, and Qingfeng Wang. "Accurate model identification of the inertial mass dynamic of hydraulic cylinder with model uncertainty." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 233, no. 5 (October 4, 2018): 501–10. http://dx.doi.org/10.1177/0959651818802113.
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In this study, a novel double-layered network scheme is proposed for accurate and efficient identification of hydraulic cylinder. The model of real hydraulic cylinder is usually partly known. If gray-box methods or black-box methods are used alone for this kind of system, parameter accuracy, simulation accuracy, the conciseness of identified result and the ease of implementation usually cannot be satisfied at the same time. The proposed double-layered network combines the advantages of gray-box and black-box methods. Accurate parameters of known model are obtained by random sample consensus algorithm in the first layer, even with modeling error. Thus, the value of unknown model can be obtained. Then the unknown model is identified by a simple black-box method in the second layer. Therefore, complete model can be obtained precisely and concisely. The overall method is easy to implement and the obtained physical parameters and model can help the controller design in industries. The proposed method is verified through simulation and real system tests, compared with several existing identification methods. Remarkable results are achieved by double-layered network in the identifications of inertial mass dynamic of hydraulic cylinder.
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Zhao, Jinsong, Gang Shen, Weidong Zhu, Chifu Yang, and Sunil K. Agrawal. "Force tracking control of an electro-hydraulic control loading system on a flight simulator using inverse model control and a damping compensator." Transactions of the Institute of Measurement and Control 40, no. 1 (June 10, 2016): 135–47. http://dx.doi.org/10.1177/0142331216651326.
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The electro-hydraulic control loading system (EHCLS) of a flight simulator is mainly used to simulate the force feel of flying a real airplane. A double-loop model, including control and hydraulic mechanism of the EHCLS, is established and its force–displacement impedance is analysed to evaluate force tracking performances and its stability. An approximated feed-forward inverse model controller is designed using a zero phase error compensation method for expanding the frequency bandwidth of the inner loop because the identified force closed-loop model is a nonminimum phase system and its direct inverse model is unstable. Modelling error between the designed feed-forward inverse model and the actual plant is discussed and a damping compensator is presented to increase stability of the EHCLS. Theoretical analysis, simulation and experimental results show that the control methods presented are feasible and can effectively improve force feel fidelity and stability of the EHCLS.
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Cedeno, Rogger José Andrade, Jesús Alberto Pérez Rodríguez, Carlos David Amaya Jaramillo, Ciaddy Gina Rodríguez Borges, Endrickson Ramón Vera Cedeno, Luis Santiago Quiroz Fernández, and Yolanda Eugenia Llosas Albuerne. "Comparative study by numerical simulation of two methods for automatic flow control in centrifugal pumps." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 3 (September 1, 2022): 1365. http://dx.doi.org/10.11591/ijpeds.v13.i3.pp1365-1379.
Повний текст джерелаАнотація:
Flow rate and pressure are variables of great interest in the process control industry, especially in pumping systems. With the help of modeling and simulation, it is possible to understand the operation of these systems prior to their construction, in addition to allowing their behavior to be analyzed in various operational scenarios and testing different control strategies. In this work, the hydraulic, mechanical, electrical and electronic models of the different components of the system are studied. Two study cases for automatic flow control are assembled, using Simscape library from MATLAB/Simulink R2019b. This study cases are: i) with a control valve and ii) with a variable speed drive. The simulations determined that both cases keep the flow constant in the face of pressure disturbances, with a good dynamic response. Case 2 consumes less power than case 1, between 24 and 64% less, especially at low flow rates. It also reduce unwanted mechanical and electrical problems due to sudden starts and stops. Case 2 produced harmonic pollution on both the grid and motor sides, which implies a potential risk for the motor and the electrical grid. Case 2 was experimentally validated, obtaining errors of less than 10%.
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Fang, Xu, Youmin Wang, and Bo Zhu. "Research on the Control Method of Force Servo System of Liquid Hydrostatic Guide Oil Film Thickness Test Bench for Machine Tools." Shock and Vibration 2022 (October 6, 2022): 1–18. http://dx.doi.org/10.1155/2022/6221067.
Повний текст джерелаАнотація:
The test bench was designed to solve the problem of measuring the oil film thickness of the liquid hydrostatic guideway of machine tools. And based on the fast overshoot of the classical PID control, introducing the self-antidisturbance control algorithm, this study established a mathematical model of the test bench electro-hydraulic servo control system. At the same time, this paper also designed a specific structure of the self-turbulence controller, which adopts optimal quadratic control, pole configuration, PID control, and self-turbulence control to study the control methods of the test bench electro-hydraulic servo system, respectively, and uses the SIMULINK module to establish the system simulation model of the above-mentioned four control methods of the test bench. Simulation results of the test bench control system show that the response speed of the self-turbulence control is 0.4 seconds, 0.2 seconds, and 4.4 seconds faster than PID control, pole configuration, and optimal quadratic control, respectively, and the overshoot is significantly reduced. Finally, the test bench was built to complete the experiments, and the experimental results showed that the followability of the loading force and thickness detection accuracy of the test bench were better after adding the self-turbulence control algorithm and the stability of the oil film thickness was significantly improved by the test bench electro-hydraulic servo control system.
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Ma, Wei, Shoulei Ma, Wenhua Qiao, Donghui Cao, and Chenbo Yin. "Research on PID Controller of Excavator Electro-Hydraulic System Based on Improved Differential Evolution." Machines 11, no. 2 (January 20, 2023): 143. http://dx.doi.org/10.3390/machines11020143.
Повний текст джерелаАнотація:
An electrical hydraulic control system (electro-hydraulic system) is thought to be a key component in excavator operation systems. Control methods with fixed parameters may not yield optimal system performances because a hydraulic system has various nonlinear uncertainties due to the leakage and compressibility of the fluid medium. Hence, a novel PID controller based on improved differential evolution (IDE) is introduced to excavator electro-hydraulic systems for interconnected hydraulic systems. The proposed algorithm not only adjusts the PID parameters of the different working conditions but also adjusts the scaling factor and crossover probability. Then, the proposed PID controller based on IDE and the excavator bucket control system are modeled and simulated on the MATLAB simulation platform. The simulation results demonstrate that the proposed controller has better performance in settling time, rise time, and convergence speed compared to the PID controller based on standard differential evolution and the Ziegler–Nichols (ZN) PID controller with a novel object function. Eventually, the IDE-PID controller is assessed on a 23-ton excavator, and good transient behavior and trajectory accuracy are obtained in comparison to the SDE-PID controller.
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ShengQing, Yang, Ji Hong, Li SenLin, Sun Fei, and Wang SuYan. "Prediction and verification for the models of temperature rising by medium bubbles in hydraulic system." Advances in Mechanical Engineering 14, no. 3 (March 2022): 168781322210854. http://dx.doi.org/10.1177/16878132221085431.
Повний текст джерелаАнотація:
In order to obtain the influence of the medium bubble contents on temperature rising characteristics of a hydraulic system, the working hydraulic system of a wheel loader was taken as the research object. By carrying out the comparison experiments of the hydraulic system with and without de-aeration devices on a 5-ton wheel loader, the air bubble contents and concerning temperatures were obtained. To identify the factors which have impact on temperature rising of the hydraulic system, the head chamber of boom cylinder is taken to analyze, and the temperature rising expression in a volume were deduced. By the utilization of the thermal hydraulic library, combining with mechanism and control libraries on AMESim simulation platform, the integrated simulation model of the whole system was established and verified, meanwhile, the simulation was carried out from aspects in different air contents and initial chamber temperatures. From the simulation, the prediction models of the air contents to temperature rising, and the pressures to temperature rising were predicted. Finally, the correctness of the prediction models are verified by experiment data and showing good results, which can be used to enrich and improve the calculation and evaluation methods of heat generation to any other hydraulic systems.
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Li, Wending, and Guanglin Shi. "Redundancy management strategy for electro-hydraulic actuators based on intelligent algorithms." Advances in Mechanical Engineering 12, no. 6 (June 2020): 168781402093045. http://dx.doi.org/10.1177/1687814020930455.
Повний текст джерелаАнотація:
This paper explores three methods for electro-hydraulic actuator redundancy management strategies based on fuzzy aggregation, Mamdani’s fuzzy logic rules, and fuzzy neural network theory. These intelligent management schemes and implementation strategies are studied for a designed hardware-independent redundancy loop. Fault identification and isolation and system reconstruction are performed by combining fuzzy clustering with Mamdani’s fuzzy control, a fuzzy neural network, and redundancy management. Simulation analyses of the three algorithms are performed and loop simulation models are established based on the analysis algorithm. The methods proposed in this paper can solve the problem of misjudgment encountered in traditional methods and can also avoid uncertain states in the system.
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Li, Hua Peng, Dong Wang, Jian Hui Xi, and Yi Bo Li. "Review on Modeling Control System of Earth Pressure Balance Shield Machine." Advanced Materials Research 181-182 (January 2011): 389–94. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.389.
Повний текст джерелаАнотація:
Analysis and design cannot be solved until a proper model of hydraulic control system of earth pressure balance shield machine is built. There are two kinds of modeling methods in common use. (1) Dynamic mathematical modeling. Two models, transfer function and state space, are mainly included. For linear system, the two methods can be provided with a fairly complete theoretical framework. However, if the system is in the complicated working environment or it is non-linear, the modeling process needs a mass of mathematical verification. This has become a limitation for application of these methods; (2) Graphical Modeling. It is more direct for the complex hydraulic control system of earth pressure balance shield machine. First, the main components are separately modeled. Then connect them according to the flow direction of signal. Some special software, such as AMESim, can be used to simplify the simulation process.
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Kitayceva, Elena. "METHODS AND ALGORITHNS FOR INCREASING THE SPEED OF COMPU-TING PROCESSES FOR CALCULATING HYDRAULIC NETWORKS." Construction and Architecture 7, no. 3 (September 28, 2019): 55–61. http://dx.doi.org/10.29039/2308-0191-2019-7-3-55-61.
Повний текст джерелаАнотація:
The article is devoted to mathematical modeling of flow distribution in hydraulic net-works. Calculations of hydraulic networks are carried out at the stage of their design and operation. The results of numerical simulation are used to control the operation of the hy-draulic network in real time. The mathematical model of the distribution of flows in the hydraulic network is a system of nonlinear equations. The nodal pressures method used to solve the system of equations numerically is the n-dimensional Newton method. To ensure stable and fast convergence of the iterative process, it is proposed to use the initial approx-imation taking into account the network topology and parameters of its objects, use the lower relaxation factor and optimize the structure of the Maxwell matrix. The algorithms presented in the paper allow one to significantly reduce the dimension of the system of nonlinear equations being solved.
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Urban, Ondřej, Michaela Kurková, and Pavel Rudolf. "Application of Computer Graphics Flow Visualization Methods in Vortex Rope Investigations." Energies 14, no. 3 (January 26, 2021): 623. http://dx.doi.org/10.3390/en14030623.
Повний текст джерелаАнотація:
Computer graphics visualization techniques for application on data from Computational Fluid Dynamics (CFD) simulations of the vortex rope, a phenomenon present in hydraulic turbines operating in off-design conditions, were devised. This included not only objects for visualization (what to visualize) but also methods of the visualization itself (how to do it). By means of advanced methods based particularly on volume rendering of Eulerian fields in combination with Lagrangian objects, various phenomena were captured, such as the motion of the vortex rope or the backflow zone. The data came from simulations using a scale-resolving hybrid turbulence model, the Stress-Blended Eddy Simulation. In such detailed simulations and other applications involving complex three-dimensional structures, proper visualization methods are needed to leverage the content captured in the resultant data.
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Rundo, Massimo, Paolo Casoli, and Antonio Lettini. "Experimental Methods for Measuring the Viscous Friction Coefficient in Hydraulic Spool Valves." Sustainability 13, no. 13 (June 25, 2021): 7174. http://dx.doi.org/10.3390/su13137174.
Повний текст джерелаАнотація:
In hydraulic components, nonlinearities are responsible for critical behaviors that make it difficult to realize a reliable mathematical model for numerical simulation. With particular reference to hydraulic spool valves, the viscous friction coefficient between the sliding and the fixed body is an unknown parameter that is normally set a posteriori in order to obtain a good agreement with the experimental data. In this paper, two different methodologies to characterize experimentally the viscous friction coefficient in a hydraulic component with spool are presented. The two approaches are significantly different and are both based on experimental tests; they were developed in two distinct laboratories in different periods of time and applied to the same flow compensator of a pump displacement control. One of the procedures was carried out at the Fluid Power Research Laboratory of the Politecnico di Torino, while the other approach was developed at the University of Parma. Both the proposed methods reached similar outcomes; moreover, neither method requires the installation of a spool displacement transducer that can significantly affect the results.
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Huber, David, Viktoria Illyés, Veronika Turewicz, Gregor Götzl, Andreas Hammer, and Karl Ponweiser. "Novel District Heating Systems: Methods and Simulation Results." Energies 14, no. 15 (July 23, 2021): 4450. http://dx.doi.org/10.3390/en14154450.
Повний текст джерелаАнотація:
Fifth-generation district heating and cooling (5th DHC) systems offer promising approaches to decarbonizing space heating, cooling and domestic hot water supply. By using these systems, clustered buildings combined with industrial waste heat can achieve a net-zero energy balance on a variety of time scales. Thanks to the low exergy approach, these systems are highly efficient. As part of the Smart Anergy Quarter Baden (SANBA) project, the thermal energy grid simulation tool TEGSim has been further developed and used to design an ultra-low-temperature district heating (ULTDH) network with hydraulic and thermal components fitted to the specific regional characteristics of the investigated case. Borehole thermal energy storage (BTES) used as seasonal storage ensures long-term feasibility. The annual discrepancy of input of thermal energy provided by space cooling and output of energy demanded by space heating and domestic hot water is supplied by an external low-grade industrial waste heat source. This paper presents the functionality of the simulation and shows how to interpret the findings concerning the design of all components and their interplay, energy consumption and efficiencies.
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Song, Haoju, Guiqin Li, Zhen Li, and Xin Xiong. "Trajectory Control Strategy and System Modeling of Load-Sensitive Hydraulic Excavator." Machines 11, no. 1 (December 22, 2022): 10. http://dx.doi.org/10.3390/machines11010010.
Повний текст джерелаАнотація:
Accurate control of excavator trajectory is the foundation for the intelligent and unmanned development of excavators. The excavator operation process requires multiple actuators to cooperate to complete the response action. However, the existing control methods to realize a single actuator of the excavator can no longer meet the practical demand. Based on this, a hybrid adaptive quantum particle swarm optimization algorithm (HAQPSO) is proposed to tune the proportional integral derivative (PID) controller parameters for enhancing the trajectory control accuracy of excavator actuators. To increase particle randomization and search speed and avoid the local convergence of QPSO, the QPSO is combined with circle chaotic mapping, Gaussian mutation operators, and adaptive adjustment factors, while the linear transformation of the contraction-expansion coefficient (CE) is improved to the dynamic adjustment mode. Through the interface block, a co-simulation platform for the load-sensitive system excavator is constructed, and trajectory experiments of multiple actuator compound actions are carried out. The simulation results show that—compared with ZN-PID, PSO-PID, and QPSO-PID—the trajectory error accuracy of the boom is improved by 26.59%, 32.95%, and 9.44%, respectively, which proves the high control accuracy of HAQPSO-PID in controlling the trajectory of multiple actuators.
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Wan, Hui Xiong, Hui Huang, and Hai Bo Huang. "Research on Multi-Actuators Speed Control Methods in Large-Scale Vessel." Key Engineering Materials 419-420 (October 2009): 85–88. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.85.
Повний текст джерелаАнотація:
For multi-actuators speed control system driven by single pump, several effective control methods have been proposed, such as flow feedback control, etc. These methods are effective only to the engineering equipment with fewer actuators. As for large vessels with more than ten actuators required for speed control, using traditional control methods will result in that costs much, the structure of the hydraulic system is very complicated, even unable to realize. In order to meet the coordinate action of many actuators, two ways based on throttle control and pressure compensation control are introduced in this paper. The research results based on the theoretical analysis of speed control error and adaptability, simulation research and experimental confirmation indicate that the throttle control method is limited by the number of actuators, load size and the speed error, but the pressure compensation control method is helpful to enhance rationality and the coordination of flow distribution between various actuators.
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Li, Dongmin, Yanqiang Zhang, Jia Li, and Shangfei Xia. "Investigation on sticking for drill rod based on finite element analysis and fuzzy proportion–integration–differentiation." Advances in Mechanical Engineering 11, no. 10 (October 2019): 168781401988071. http://dx.doi.org/10.1177/1687814019880710.
Повний текст джерелаАнотація:
In order to investigate the essence of sticking for drill rod served in underground coal mine, a comprehensive solution combing finite element analysis with fuzzy proportion–integration–differentiation on the drilling rig is proposed. First, the structure and working mechanism of the drilling rig are studied; then, the static and modal analyses on the drill rod with finite element analysis are performed according to the actual working conditions of the drilling rig. Furthermore, a load-sensing hydraulic power system of the drilling rig is built, and the co-simulation with AMESim and Simulink is performed on the response, overshoot, and vibration, when the hydraulic power is controlled with the conventional control method, proportion–integration–differentiation control method, and fuzzy proportion–integration–differentiation method, respectively. The simulation results show that the strength, stiffness, and vibration frequency of the drilling rig model meet the working requirements, and no resonance occurs; furthermore, the load-sensing hydraulic power system with fuzzy proportion–integration–differentiation method is preferable than the other two control methods.
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Zheng, Jingzhong, and Jianyong Yao. "Robust adaptive tracking control of hydraulic actuators with unmodeled dynamics." Transactions of the Institute of Measurement and Control 41, no. 14 (May 12, 2019): 3887–98. http://dx.doi.org/10.1177/0142331219841122.
Повний текст джерелаАнотація:
Traditional control methods for precise motion control of electro-hydraulic servo systems are primarily based on rigid-body dynamics of the system. Considering that structural flexibility of the mechanical components have a certain impact on all drive systems, the neglected high-frequency dynamics caused by structural flexibility have become one of the major obstacles when developing better control performance. In this paper, a high-accuracy tracking control is concerned for hydraulic actuators with unmodeled flexible dynamics. Firstly, a damping term is utilized to counterweigh the unmodeled nonlinear flexible function and a dynamic signal is designed to control the dynamic flexible disturbance. Then, in order to process parametric uncertainties along with unmodeled flexible dynamics, an adaptive backstepping controller is proposed. The controller theoretically guarantees global bounded tracking performance via Lyapunov analysis. The experimental and simulation results illustrate the high-performance nature of the proposed controller.
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Qiao, Zhong Yun, and Fu Zhou Zhao. "Simulink on Hydraulic System of Engineering Vehicle." Applied Mechanics and Materials 201-202 (October 2012): 499–502. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.499.
Повний текст джерелаАнотація:
Traditional energy saving methods for engineering vehicle cannot raise the effect on a large scale if there are no major technology breakthrough. Hybrid system has the potential of improving fuel economy by operating the engine in an optimum efficiency range and it has been successfully applied in engineering vehicles. So equipping engineering vehicle with the hybrid system provides a new way to achieve energy savings. Simulation results of vehicles based on backward modelling shows that the energy control strategy can achieve a variety of reasonable operating mode switching and meet the vehicle at power.
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Kolsi-Gdoura, E., M. Feki, and N. Derbel. "Observer Based Robust Position Control of a Hydraulic Servo System Using Variable Structure Control." Mathematical Problems in Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/724795.
Повний текст джерелаАнотація:
This paper deals with the position control of a hydraulic servo system rod. Our approach considers the surface design as a case of virtual controller design using the backstepping method. We first prove that a linear surface does not yield to a robust controller with respect to the unmatched uncertainty and perturbation. Next, to remedy this deficiency, a sliding controller based on the second-order sliding mode is proposed which outperforms the first controller in terms of chattering attenuation and robustness with respect to parameter uncertainty only. Next, based on backstepping a nested variable structure design method is proposed which ensures the robustness with respect to both unmatched uncertainty and perturbation. Finally, a robust sliding mode observer is appended to the closed loop control system to achieve output feedback control. The stability and convergence to reference position with zero steady state error are proven when the controller is constructed using the estimated states. To illustrate the efficiency of the proposed methods, numerical simulation results are shown.
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Nie, Yong, Jiajia Liu, Zhenhua Lao, and Zheng Chen. "Modeling and Extended State Observer-Based Backstepping Control of Underwater Electro Hydrostatic Actuator with Pressure Compensator and External Load." Electronics 11, no. 8 (April 18, 2022): 1286. http://dx.doi.org/10.3390/electronics11081286.
Повний текст джерелаАнотація:
Electro hydrostatic actuator (EHA) has been successfully developed for flight control applications to replace the cumbersome centralized hydraulic system. It also has excellent potential for ocean applications due to its advantages on miniaturization and energy-savings. One of the special technologies for EHA’s underwater application is pressure compensation, which is used to equalize the return pressure of the hydraulic system and the seawater pressure. This paper investigates the modeling and control design of underwater EHA to improve performance, especially considering the effect of additional pressure compensator and uncertain external load. The nonlinear hydraulic model is extended by the dynamic characteristics of the pressure compensator. Two low-order extended state observers were constructed to cope with the external load fore and the effect of the pressure compensator, respectively. The backstepping methods were designed to guarantee the robust stability of the entire high-order nonlinear hydraulic system. Finally, the theoretical proving and simulation on Matlab/Simulink are conducted to demonstrate the high tracking performance of the proposed control strategy.
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Zhang, Hao, Yuhu Bai, Bingxiang Xu, Xulin Du, and Shaohua Gai. "Numerical Simulation and Sensitivity Analysis of Hydraulic Fracturing in Multilayered Thin Tight Sandstone Gas Reservoir." Geofluids 2023 (January 6, 2023): 1–26. http://dx.doi.org/10.1155/2023/8310206.
Повний текст джерелаАнотація:
Hydraulic fracturing is a necessary measurement to realize the commercial exploitation of oil and gas, but its application in multilayered thin tight sandstone gas reservoirs is still not perfect, which usually have thin gas layers mixed with complex intervals, and shows a dramatic variation in geological and geomechanical properties in the vertical direction. When conventional hydraulic fracturing methods are applied to this kind of reservoir, it is hard to get proper fracture propagation, especially for fracture height control. Facing this situation, this paper proposes a numerical study of the hydraulic fracturing mechanism and analyzes its influencing factors in the multilayered thin tight sandstone gas reservoir. Relying on a real reservoir in the Ordos Basin in China, relevant geological and geomechanical parameters of major gas layers and interlayers are obtained. According to these parameters, the hydraulic fracturing simulation in the multilayered thin tight gas reservoir model is carried out, based on which, the sensitivity analysis of different geological and fracturing parameters which affect the fracture propagation is performed. Furthermore, a real low-production well after fracturing in this kind of reservoir is selected as an example, and based on the analysis, an optimized fracturing scheme is proposed to adapt to the characteristics of the reservoir. According to the comparison of fracturing and production simulations, the optimized fracturing scheme can prevent hydraulic fractures from breaking through thin interlayers, control the fracture height, and prevent fractures from communicating strata with a high water-bearing layer. At the same time, with the same amount of proppant and fracturing fluid, longer fracture length and better fracture conductivity are created, so that the productivity of the optimized fracture has been greatly improved.
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Liu, Huanlong, Dafa Li, Guanpeng Chen, Chixin Xie, Jiawei Wang, and Lei Feng. "Research on power coupling characteristics and acceleration strategy of electro-hydrostatic hydraulic hybrid power system." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 235, no. 8 (January 25, 2021): 1445–59. http://dx.doi.org/10.1177/0959651820987729.
Повний текст джерелаАнотація:
Aiming at the adverse effect of the peak power of the electric motor of the battery-powered rail vehicles on the battery life and the driving range when starting or accelerating, a new type of electro-hydrostatic hydraulic hybrid powertrain is designed. This article proposes a novel power form that assists the vehicle to start or accelerate through two power coupling methods: torque coupling circuit and flow rate coupling circuit which have good power performance and energy-saving performance. A mathematical model for power coupling of hybrid power system is constructed, and the effects of key parameters of the system and different power coupling ratios on electric power consumption and power coupling characteristics are studied. Based on the simulation and test platform, the power coupling characteristics of the electro-hydrostatic hydraulic hybrid powertrain are simulated and experimentally researched. The results show that compared with the traditional electro-hydrostatic series system, the novel electro-hydrostatic hydraulic hybrid powertrain can effectively avoid the impact of electric motor power and reduce the power consumption. Based on the characteristics of power coupling, the acceleration strategy of minimum peak power is studied to control the key components of the power coupling process. Simulation and experimental results show that under the control of the new acceleration strategy, the electro-hydrostatic hydraulic hybrid powertrain has good electro-hydraulic power coupling characteristics. The electric power of the power system is greatly reduced during acceleration, which has better energy-saving characteristics and value for engineering applications.
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Liu, Difei, Zhiyong Tang, and Zhongcai Pei. "Variable Structure Compensation PID Control of Asymmetrical Hydraulic Cylinder Trajectory Tracking." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/890704.
Повний текст джерелаАнотація:
A novel variable structure compensation PID control, VSCPID in short, is proposed for trajectory tracking of asymmetrical hydraulic cylinder systems. This new control method improves the system robustness by adding a variable structure compensation term to the conventional PID control. The variable structure term is designed according to sliding mode control method and therefore could compensate the disturbance and uncertainty. Meanwhile, the proposed control method avoids the requirements for exact knowledge of the systems associated with equivalent control value in SMC that means the controller is simple and easy to design. The stability analysis of this approach is conducted with Lyapunov function, and the global stability condition applied to choose control parameters is provided. Simulation results show the VSCPID control can achieve good tracking performances and high robustness compared with the other control methods under the uncertainties and varying load conditions.
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Gao, Bingwei, Hao Guan, Wenming Tang, Wenlong Han, and Shilong Xue. "Research on Position Recognition and Control Method of Single-leg Joint of Hydraulic Quadruped Robot." (Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 14, no. 8 (December 23, 2021): 802–11. http://dx.doi.org/10.2174/2352096514666211027150816.
Повний текст джерелаАнотація:
: In order to obtain the precise mathematical model of the position control system of the hydraulic quadruped robot, and to meet the requirements of the system parameters in different stages of motion, this paper studies the position control system of the single-leg joint of the hydraulic quadruped robot: First of all, this paper uses the closed-loop indirect identification method to identify the position of the leg joints of the hydraulic quadruped robot to obtain the mathematical model of the system; And then, the speed PID control algorithm and speed planning algorithm are designed, so that the system can quickly respond to the changes of system input according to the requirements of different speeds; Finally, the joint position control system of the hydraulic quadruped robot is simulated and verified by experiments. Background: The mathematical model of the positioning system of the hydraulic quadruped robot is clear, but the parameters in the model have the characteristics of uncertainty and time-variation. In the joint position control system of a hydraulic quadruped robot, different motion stages have different requirements for system parameters. Objective: The purpose of this study is to obtain the precise mathematical model of the position control system of the hydraulic quadruped robot and to meet the requirements of the system parameters in different stages of motion. Methods: This research takes the hydraulic quadruped robot single-leg system as the research object and uses the closed-loop indirect identification method to identify the position of the leg joints of the hydraulic quadruped robot to obtain the mathematical model of the system. Then, the speed PID control method is designed and compared with the ordinary PID control by taking the positioning control accuracy of the robot before touching the ground as a standard to carry out the controlled trial. Results: In this research, the identification method and control algorithm are designed, and finally, the simulation and experimental research are carried out. The results of the simulation and experiment verify the correctness of the identification method and the effectiveness of the control algorithm. Conclusion: First of all, this paper uses the closed-loop indirect identification method to identify the position of the leg joints of the hydraulic quadruped robot to obtain the mathematical model of the system. Then, the speed PID control algorithm and speed planning algorithm are designed so that the system can quickly respond to the changes of system input according to the requirements of different speeds.
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Qin, Binbin, Fulian He, Xiaobing Zhang, Xuhui Xu, Wei Wang, Liang Li, and Chen Dou. "Stability and Control of Retracement Channels in Thin Seam Working Faces with Soft Roof." Shock and Vibration 2021 (September 13, 2021): 1–12. http://dx.doi.org/10.1155/2021/8667471.
Повний текст джерелаАнотація:
To reduce the risk of roof falling and rib spalling during equipment retracement in thin coal seam faces with soft roofs, the 25070 working face of Xuehu Coal Mine was taken as the research object, and theoretical analysis, numerical simulation, and field practice methods were used. Under different space relationships between retracement channels and main roof fracture, the load of hydraulic supports was quantitatively analyzed. The relationship between the working resistance of the hydraulic support and the sinking rotation angle of the immediate roof was analyzed, and a reasonable time for the arrangement of the retracement channel was determined. The sublevel excavation technology and the combined support technology of roof anchor cables and coal rib anchors were proposed. The field application shows that the falling height and rate of movable prop of the hydraulic supports, working resistance of the hydraulic supports, and the roof subsidence all meet the requirements of safety production during the terminal mining period, and the surrounding rock control effect of retracement channel was determined to be good. The safe and efficient mining of the coal mine is ensured, and the research results can provide guidance for similar working faces.
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Kler, Aleksandr M., and Danil V. Apanovich. "Numerical simulation of the water hammer phenomenon taking into account the hydraulic friction of the pipeline by the control point method." Analysis and data processing systems, no. 3 (September 29, 2022): 59–74. http://dx.doi.org/10.17212/2782-2001-2022-3-59-74.
Повний текст джерелаАнотація:
The calculations of dynamic processes in the pipeline are necessary for modeling the processes of fluid movement in the pipeline, for example, for predicting loads on the pipeline when compression and rarefaction waves move in it. These tasks are reduced to solving systems of partial differential equations. The calculation of the phenomenon excluding hydraulic friction can be carried out by the method of characteristics, however, the calculation, taking into account the friction forces, is complicated for known methods, such as the finite difference method and the final element method. The article provides a brief description and an example of using the control point method for the task of modeling the water hammer phenomenon, taking into account the hydraulic friction forces of the pipeline. The main idea of the proposed method is to reduce the solution of these systems of equations to solving linear programming problems. The purpose of this work is to solve the problem of water hammerwith friction by the control point method. This method, developed jointly with A.S. Maksimov by the authors of this article at the Melentiev Energy Systems Institute, has shown good results in solving systems of partial differential equations of a periodic heat exchanger with ceramic ball filling. Moreover, heat transfer inside these elements was taken into account. With large values of thermal conductivity coefficients, this system is also rigid, which complicates its solution by the control volume method, but the control point method has shown good results. This gives reason to consider it promising in calculations of hydraulic friction. The results of modeling a hydraulic shock to a pipe filled with an incompressible liquid at different friction coefficients have been obtained. The results make it possible to make a numerical assessment of the effect of the o hydraulic friction coefficient on the attenuation of oscillatory processes during a hydraulic shock.
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Zhang, Peng, and Yunhua Li. "Research on Control Methods for the Pressure Continuous Regulation Electrohydraulic Proportional Axial Piston Pump of an Aircraft Hydraulic System." Applied Sciences 9, no. 7 (April 1, 2019): 1376. http://dx.doi.org/10.3390/app9071376.
Повний текст джерелаАнотація:
The objective of this paper is to design a pump that can match its delivery pressure to the aircraft load. Axial piston pumps used in airborne hydraulic systems are required to work in a constant pressure mode setting based on the highest pressure required by the aircraft load. However, the time using the highest pressure working mode is very short, which leads to a lot of overflow lose. This study is motivated by this fact. Pressure continuous regulation electrohydraulic proportional axial piston pump is realized by combining a dual-pressure piston pump with electro-hydraulic proportional technology, realizing the match between the delivery pressure of the pump and the aircraft load. The mathematical model is established and its dynamic characteristics are analyzed. The control methods such as a proportional integral derivative (PID) control method, linear quadratic regulator (LQR) based on a feedback linearization method and a backstepping sliding control method are designed for this nonlinear system. It can be seen from the result of simulation experiments that the requirements of pressure control with a pump are reached and the capacity of resisting disturbance of the system is strong.