Journal articles on the topic 'Hydraulic control Mathematical models'
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1
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.
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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.
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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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Yuan, Rui Bo, Min He, and Zong Cheng Zhang. "Water Hydraulic Synchronous System Position Control of Modeling and Simulation." Applied Mechanics and Materials 52-54 (March 2011): 457–63. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.457.
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Introduction of a water synchronous hydraulic system , the special physical and chemical properties for water and the position requirements in Synchronous control , mathematical models is based on the system and simulate the position control performance of the system . there is a reference value of water hydraulic field application of synchronous controlling.
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CHERNYSHOV, Sergei, Vladislav GALKIN, Zoya ULYANOVA, and David Macdonald. "Development of mathematical models to control the technological properties of cement slurries." Journal of Mining Institute 242 (May 26, 2020): 179. http://dx.doi.org/10.31897/pmi.2020.2.179.
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Oil and gas producing enterprises are making increasingly high demands on well casing quality, including the actual process of injection and displacement of cement slurry, taking into account requirements for the annular cement level, eliminating possible hydraulic fracturing, with developing a hydraulic cementing program. It is necessary to prevent deep invasion of cement slurry filtrate into the formation to exclude bridging of productive layers. It is impossible to fulfill all these requirements at the same time without application of modifying additives; complex cement compositions are being developed and applied more often. Furthermore, need to adjust cement slurries recipes appears for almost every particular well.
In order to select and justify cement slurries recipes and their prompt adjustment, taking into account requirements of well construction project, as well as geological and technical conditions for cementing casing strings, mathematical models of the main technological properties of cement slurries for cementing production casing strings in the Perm Region were developed. Analysis of the effect of polycarboxylic plasticizer (Pl) and a filtration reducer (fluid loss additive) based on hydroxyethyl cellulose (FR) on plastic viscosity (V), spreadability (S) and filtration (F) of cement slurries is conducted. Development of mathematical models is performed according to more than 90 measurements.
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Puzanov, A. V. "Transdisciplinary models of hydraulic drives of mobile machinery." «System analysis and applied information science», no. 4 (February 6, 2019): 51–55. http://dx.doi.org/10.21122/2309-4923-2018-4-51-55.
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Modern drive engineering requires a comprehensive analysis of all work processes in hydraulic drives, solving the problems of modeling the technological processes of their production using mathematical and software tools of various physicality.The article proposes an approach to the development of hydrodrives of mobile equipment based on transdisciplinary models of instruments and control systems. These models are designed to unite in a single information space a methodical and mathematical apparatus of various physicality: mechanics, kinematic, hydromechanics, heat engineering, and methods for their solution. These measures will increase their adequacy, reduce assumptions and reduce the safety factor as a measure of imperfection of the scientific and technical understanding of the facility.The article gives an example of the use of this approach in the development of volumetric hydraulic drives of mobile equipment a technique for calculating the indicator diagram of an axial-plunger hydraulic machine at a micro level using the Matlab / Simulink, Autodesk Simulation CFD and Autodesk Simulation Mechanical software complexes. The indicator diagram of the hydraulic machine is a clear characteristic of the dynamic qualities of the product. From the correctness of the calculation of this characteristic, the dynamic properties, reliability and resource of the drive as a whole depend.
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Knezevic, Darko, Aleksandar Milasinovic, Zdravko Milovanovic, and Sasa Lalos. "The influence of thermodynamic state of mineral hydraulic oil on flow rate through radial clearance at zero overlap inside the hydraulic components." Thermal Science 20, suppl. 5 (2016): 1461–71. http://dx.doi.org/10.2298/tsci16s5461k.
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In control hydraulic components (servo valves, LS regulators, etc.) there is a need for precise mathematical description of fluid flow through radial clearances between the control piston and body of component at zero overlap, small valve opening and small lengths of overlap. Such a mathematical description would allow for a better dynamic analysis and stability analysis of hydraulic systems. The existing formulas in the literature do not take into account the change of the physical properties of the fluid with a change of thermodynamic state of the fluid to determine the flow rate through radial clearances in hydraulic components at zero overlap, a small opening, and a small overlap lengths, which leads to the formation of insufficiently precise mathematical models. In this paper model description of fluid flow through radial clearances at zero overlap is developed, taking into account the changes of physical properties of hydraulic fluid as a function of pressure and temperature. In addition, the experimental verification of the mathematical model is performed.
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Zhao, Teng, Peng Sun, and Yong Ding. "The Research on the Hydraulic-Control System for the Heave Compensation under the Deepwater Installation." Advanced Materials Research 468-471 (February 2012): 1806–9. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1806.
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Based on the heave compensation system during the installation in the deepwater, the performance of the hydraulic unit and the control unit is researched .The mathematical models which is about the flow characteristics ,the load pressure and the Mechanics balance on the hydraulic- Control system are built, and then the models are simulated by using the PID control method. The simulation results are showed under the different levels, and the best match of the control parameters is found by the different objects，to realize the intelligent designing in heave compensation system.
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Li, Yuesong. "Mathematical modeling and linearized analysis of the jet-pipe hydraulic amplifier applied to a servovalve." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 2 (November 21, 2017): 657–66. http://dx.doi.org/10.1177/0954410017740386.
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The accurate mathematical model of the jet-pipe hydraulic amplifier, which is the pilot control stage of a jet-pipe servovalve, is very necessary to analyze and control the performance of a jet-pipe servovalve. In this paper, based on the hydraulic bridge’s flow balance equations, an improved nonlinear explicit model with the absorption effect is developed. The linearized model and valve coefficients are derived from the nonlinear improve model. To test and verify the improved models, the pressure and flow characteristic model of jet-pipe hydraulic amplifier are verified by the experiment. The results show that the model is approximate to the experimental data. In addition, the influence of structural parameters on performance of jet-pipe hydraulic amplifier is analyzed by simulation.
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Yue, Jing Tao, Hui Pu, and Xiao Jun Wei. "The Transitional Simulation of Self-Propelled Winch System by the AMESim." Applied Mechanics and Materials 687-691 (November 2014): 228–31. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.228.
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The self-propelled winch system was studied taking the 20-ton transitional self-driven winch system as the engineering background. By the analysis of structural characteristics, control loops, speed solutions and hydraulic motor-driven forms of winch hydraulic system, The system of mathematical models was established which lay the foundation of the establishment of system simulation model. The walking hydraulic drive system simulation models were established by using AMESim software. On this basis, by setting different parameters, the simulation system operating conditions are simulated, which verified the rationality and stability of the design of the winch hydraulic transmission system.
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Grachev, S. I., A. V. Strekalov, and A. T. Khusainov. "IMPROVEMENT OF THE LEVEL OF CONTROL AND MONITORING OF THE RESERVOIR PRESSURE MAINTENANCE SYSTEM THROUGH CREATION OF THE UNIVERSAL MODEL." Oil and Gas Studies, no. 3 (July 1, 2016): 52–60. http://dx.doi.org/10.31660/0445-0108-2016-3-52-60.
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The waterflooding process is provided by the technical hydraulic system (THS) of reservoir pressure maintenance, including water intake facilities, treatment systems, pumping stations, pipeline network, shut-off and throttling valves, wellhead equipment of injectors, drained (by boreholes) and flooded (by injection wells) zones of the formation or the system as a whole. The obvious THS interconnection with the productive strata system required a creation of the THS model and the model of productive strata hydraulic system, which should be integrated into a comprehensive model. In the sphere of simulation of hydraulic systems at present there is no theoretical basis formed for building unified hydraulic models related to productive strata systems. Also, there is no unified approach to the mathematical and algorithmic description of models of hydraulic systems with arbitrary properties of elements, due to which the created models and their software implementations are used exclusively in the industry context with large restrictions on description of the properties of the system elements and the boundary conditions.
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Richard, Edouard, and Jean C. Vivalda. "Mathematical Analysis of Stability and Drift Behavior of Hydraulic Cylinders Driven by a Servovalve." Journal of Dynamic Systems, Measurement, and Control 124, no. 1 (May 18, 2001): 206–13. http://dx.doi.org/10.1115/1.1433482.
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Hydraulic cylinders are commonly used and many works deal with modeling and control of such devices. This article deals with the stability properties of hydraulic cylinders drift in various situations. The study is based on a classic nonlinear model of these physical systems. The cases of system models without leakages and models with cylinder leakages or servovalve leakages are distinguished and lead to distinct behaviors. The stability properties are proven by various mathematical arguments such as first integrals, Lyapunov theorems, LASALLE invariance principle, BARBALAT’s lemma, and the center manifold theory.
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Sidders, J. A., D. G. Tilley, and P. J. Chappie. "Thermal-Hydraulic Performance Prediction in Fluid Power Systems." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 210, no. 4 (November 1996): 231–42. http://dx.doi.org/10.1243/pime_proc_1996_210_462_02.
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This paper presents a modelling approach to the study of thermal-hydraulic performance in fluid power systems. A set of lumped parameter mathematical models are developed which are based on conservation of mass and energy for the system. The theoretical basis and modelling strategy are discussed for an open circuit containing a hydraulic pump, loading valve, heat exchanger and reservoir. Simulation results are presented which show a comparison of model/rig performance, and the agreement obtained demonstrates the validity of the modelling approach. It is shown that the thermal response is dominated by the reservoir heat capacity and that close correspondence between the model and rig is only achievable with accurate hydraulic performance models.
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Xu, Ming, Cheng Rong, and Long He. "Design and Modeling of a Bio-Inspired Flexible Joint Actuator." Actuators 10, no. 5 (April 30, 2021): 95. http://dx.doi.org/10.3390/act10050095.
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Spiders rely on a hydraulic system to stretch their legs but use muscles to make their legs flex. The compound drive of hydraulics and muscle makes an integrate dexterous structure with powerful locomotion abilities, which perfectly meets the primary requirements of advanced robots. Inspired by this hydraulics-muscle co-drive joint, a novel flexible joint actuator was proposed and its driving characteristics were preliminarily explored. The bio-inspired flexible joint manifested as a double-constrained balloon actuator, which was fabricated by the composite process of 3D printing and casting. To evaluate its performance, the mathematical model was deduced, as well as the finite element analysis (FEA) model. A series of experiments on the rotation angles, driving forces, and efficiencies of the flexible joint were carried out and compared with the mathematical calculations and FEA simulations. The results show that the accuracy of the two theoretical models can be used to assess the joint actuator. The locomotion test of a soft arthropod robot with two flexible joints was also implemented, where the moving speed reached 22 mm/s and the feasibility of the proposed flexible joint applied to a soft robot was demonstrated.
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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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Wu, Hong Xia, and Li Li Wan. "Research on the Modeling of Hydraulic Turbine Governing System." Advanced Materials Research 1037 (October 2014): 253–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.253.
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The turbine prime mover and its control system have a significant impact on the dynamic stability and long-term stability of power system. On calculation of power system stability, the calculation results have great difference when using different model and parameters of prime mover and its speed governor control system. We can choose the mathematical models and parameters which can reflect the actual running status of equipment in order to make the calculation result is true and reliable. This paper takes a hydropower station as an example, determines the mathematical model and the parameter which can be used for power system stability calculation through the adoption of modeling, parameter identification and testing methods to its prime mover, excitation system and governor 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.
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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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Vanin, Viktor, Mykola Kruhol, and Oleksandr Lasurenko. "MATHEMATICAL MODELLING OF ONE-GROUP GAS-HYDRAULIC CIRCUIT OF THERMAL POWER PLANT STEAM BOILER AUXILIARIES." Bulletin of the National Technical University "KhPI". Series: Mathematical modeling in engineering and technologies, no. 1 (March 5, 2021): 3–14. http://dx.doi.org/10.20998/2222-0631.2020.01.01.
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The paper presents algebraic mathematical models of centrifugal mechanisms that operate in the power boiler gas-hydraulic circuit. The models have been built by means of head-flow curve approximation. The head-flow curve depends on the centrifugal mechanism blade rotating speed and guide vane angle. The least squares method has been applied for centrifugal mechanism head-curve approximation on the basis of experimental or numerical data. Different configurations for the connections of centrifugal mechanisms in the power boiler gas-hydraulic circuit have been considered, relationships for their performance assessment obtained, and efficiency factors for various methods of their capacity control introduced. The state equation for a complex gas-hydraulic network in the problem of its efficiency analysis has been obtained with application of Kirchhoff laws. Numerical algorithms have been developed to solve group control parameter optimization problems for the considered connections of centrifugal mechanisms. Features of mathematical models for groups of series-, parallel- and complex-connected centrifugal mechanisms with different head curves in the power boiler maintenance system have been specified. An optimal group control problem for a group of centrifugal mechanisms has been formulated and solved under various power boiler modes. For the feed pumps, individual frequency control proves to be the most effective method, while for the boiler draft mechanisms group frequency regulation turns out to be the most efficient. In a typical summer month, implementation of energy-efficient centrifugal mechanism capacity regulation method in a Thermal Power Plant is shown to result in auxiliary electricity consumption reduction by 10.96 % as compared with available actual data.
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Achitaev, Andrey, Pavel Ilyushin, Konstantin Suslov, and Sergey Kobyletski. "Dynamic Simulation of Starting and Emergency Conditions of a Hydraulic Unit Based on a Francis Turbine." Energies 15, no. 21 (October 29, 2022): 8044. http://dx.doi.org/10.3390/en15218044.
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The Francis hydro-turbine is a typical nonlinear system with coupled hydraulic, mechanical, and electrical subsystems. It is difficult to understand the reasons for its operational failures, since the main cause of failures is due to the complex interaction of the three subsystems. This paper presents an improved dynamic model of the Francis hydro-turbine. This study involves the development of a nonlinear dynamic model of a hydraulic unit, given start-up and emergency processes, and the consideration of the effect of water hammer during transients. To accomplish the objectives set, existing models used to model hydroelectric units are analyzed and a mathematical model is proposed, which takes into account the dynamics during abrupt changes in the conditions. Based on these mathematical models, a computer model was developed, and numerical simulation was carried out with an assessment of the results obtained. The mathematical model built was verified on an experimental model. As a result, a model of a hydraulic unit was produced, which factors in the main hydraulic processes in the hydro-turbine.
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Jablonská, Jana, and Milada Kozubková. "Evaluation of the Characteristics of the Control Valves." MATEC Web of Conferences 328 (2020): 03011. http://dx.doi.org/10.1051/matecconf/202032803011.
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When designing pipeline networks, the knowledge of loss coefficient respectively resistance coefficient when flowing through various types of fluids through hydraulic elements, e.g. control valves, which are often used in the engineering and energy industry. Their specification is performed mainly experimentally. However, there are applications where the experimental approach of their determination is unrealistic and then mathematical methods can be considered. The article presents a methodology for determining the static characteristics of the DN25 control valve for different opening. The measurement of the characteristics was performed with an incompressible flowing medium - water and with a compressible flowing medium - air. Subsequently, a comparison of measurement and evaluation of loss and flow coefficients was performed. The measured values will be further used to verify the results of modelling and to precisely define mathematical models, so that the models can be subsequently used at vapour flow, where the experimental method of determination is difficult. Frequent applications are found in the flow of saturated and superheated vapour through control valves.
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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.
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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.
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Răsvan, Vladimir. "Control of Conservation Laws – An Application." Tatra Mountains Mathematical Publications 71, no. 1 (December 1, 2018): 155–74. http://dx.doi.org/10.2478/tmmp-2018-0014.
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Abstract We present here three types of controlled boundary value problems for conservation laws arising from energy co-generation, hydraulic flows and water hammer for hydroelectric power plants and control of the open channel flows (shallow water). The novelty of these models, from the mathematical point of view, is that they are described by nonlinear hyperbolic partial differential equations of the conservation laws with (possibly) nonlinear boundary conditions. At their turn these boundary conditions are controlled by some systems of ordinary differential equations. The engineering requirements for such systems are asymptotic stability and disturbance rejection: these properties have to be achieved by feedback control. In our setting the main tool for tackling these problems is a suitable Lyapunov functional arising from the energy identity. The hints for “guessing” this functional are to be found in the linearized version of the aforementioned mathematical objects.
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A. A., Yuldashov, and Karimov G. X. "Models of Distribution of Flow Parameters in Intensive Garden Irrigation, System Pipes." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 838–44. http://dx.doi.org/10.22214/ijraset.2022.40692.
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Annotation: The mathematical description of the movement of water in the systems of irrigation pipelines, based on the equation of continuity of the medium, the system of Navy-Stokes equations. The resulting mathematical package describes a system with distributed parameters and is performed based on the condition of dynamic balance at the point of flow, taking into account the dependence on the nature of the flow and the physical properties of the environment. Calculation is executed with use of functions Besseliya. Methodology for calculating the hydrodynamic component of water movement in irrigation water supply systems. Pipelines are universal in nature and can be used in the calculation, construction and assessment of the stability of water supply hydraulic systems; the technique can be used to describe the object of operation in the construction of control systems for the hydraulic parameters of the water supply system. Keywords: pipeline, irrigation systems, non-uniformity, liquid, water, strength, function, three-dimensional, water supply, hydrodynamics, hydrostatics, quasi-one-dimensional, unsteady, flow, potential, surface, coordinate system, stresses, projection, velocity, cylindrical coordinates, unsteady motion , asymmetric, viscous, compressible fluid, plastic pipe
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Rubin, Oleg D., Anton S. Antonov, Evgeny N. Bellendir, Ekaterina M. Kobochkina, and Oleg N. Kotlov. "Development of the design module of the software and hardware complex to ensure the safety of mutually influencing HPS." Structural Mechanics of Engineering Constructions and Buildings 15, no. 2 (December 15, 2019): 96–105. http://dx.doi.org/10.22363/1815-5235-2019-15-2-96-105.
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Relevance. As part of the implementation of the Federal Law No. 117-FZ “On the Safety of Hydraulic Structures”, it is necessary to continuously monitor the state of hydraulic structures and related facilities by equipping with control and measuring instruments. The development of modern computer complexes allows us to carry out and predict the state of objects by combining computational research and field observations. The work is aimed at organizing a comprehensive assessment of the state of the HPS and ensuring the safety of existing and projected mutually influential complexes. Aims of research. Improving the safety of the operated (under construction) complex of interfering hydraulic structures. Assessment of sufficient and highquality engineering and repair work carried out on the HPS. Development of recommendations for improving the efficiency of construction of new and modernization of operated hydropower facilities. HPS on the example of the Zagorsk HPS. Methods. Representation of the interaction ideology of various software systems of mathematical modeling, using control and measuring instruments data for calibration and verification of mathematical models. Results. The structure of the HSC calculation module was updated, systematization of the calculation models was carried out, interaction and transfer of the initial data to the calculation module of the software and hardware complex was revealed. The implementation of scientific research is aimed at improving the safety of the complex hydraulic structures.
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Beltran-Carbajal, Francisco, Antonio Valderrabano-Gonzalez, Antonio Favela-Contreras, Jose Luis Hernandez-Avila, Irvin Lopez-Garcia, and Ruben Tapia-Olvera. "An Active Vehicle Suspension Control Approach with Electromagnetic and Hydraulic Actuators." Actuators 8, no. 2 (April 24, 2019): 35. http://dx.doi.org/10.3390/act8020035.
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An active vibration control approach from an online estimation perspective of unavailable feedback signals for a quarter-vehicle suspension system is introduced. The application of a new signal differentiation technique for the online estimation of disturbance trajectories due to irregular road surfaces and velocity state variables is described. It is assumed that position measurements are only available for active disturbance suppression control implementation. Real-time signal differentiation is independent of detailed mathematical models of specific dynamic systems and control force generation mechanisms. Active control forces can be supplied by electromagnetic or hydraulic actuators. Analytical and simulation results prove the effective and fast dynamic performance of the online signal estimation as well as a satisfactory active disturbance attenuation on a quarter-vehicle active suspension system.
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Li, Guo Ping, Lu Wei Wang, and Li Sheng Shu. "Design and Simulation of Electric Pallet Truck Hydraulic Anti-Skid System." Applied Mechanics and Materials 37-38 (November 2010): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.299.
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Based on electric pallet truck skids in the process of moving because of low road attachment coefficient, this paper proposed an anti-skid method by changing the proportion of enduring pressure between the driving wheel and trundles. Anti-skid control theory of the new method is researched and mathematical models of the main modules are established. Anti-skid control system is simulated by using AMESim and Matlab / Simulink software. Simulation results show that, this hydraulic anti-skid system can respond quickly and precisely.
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Du, Heng, Lin Wang, Jinda Chen, Hui Huang, and Yunchao Wang. "Adaptive fuzzy radial basis function neural network integral sliding mode tracking control for heavy vehicle electro-hydraulic power steering systems." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 2-3 (May 6, 2019): 872–86. http://dx.doi.org/10.1177/0954407019846378.
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Due to parametric uncertainties, unknown nonlinearities, and dynamic external disturbances, it is a challenging and valuable task for heavy vehicle electro-hydraulic power steering systems to realize high-precision tracking control. To cope with this complex nonlinear tracking control problem, the integral sliding mode control is an extremely potential control method, which has strong robustness to model uncertainties and unknown disturbances, and can effectively reduce the steady-state error in tracking control process. However, the inherent chattering phenomenon of integral sliding mode control seriously affects its control performance. In order to suppress the chattering while ensuring robustness, adaptive fuzzy technique is adopted as an effective auxiliary means, which can not only deal with the inherent chattering problem of integral sliding mode control and a priori knowledge of the disturbance upper bound in controller design but also dynamically adjust the parameters in the fuzzy rules. Moreover, the designed adaptive fuzzy–integral sliding mode control scheme still needs the precise mathematical models of the control systems. But it is difficult to obtain the model for heavy vehicle electro-hydraulic power steering systems with highly complex and coupling properties. Therefore, to further improve the method, this paper presents a novel adaptive fuzzy–radial basis function neural network–integral sliding mode control method for the complex systems to achieve timely and accurate steering angle tracking control. In addition to the advantages of adaptive fuzzy–integral sliding mode control, the modified controller no longer requires the precise mathematical models of heavy vehicle electro-hydraulic power steering systems and realizes the continuous adaptive updating of weights. Finally, the effectiveness and superiority of the proposed control scheme is illustrated by comparisons and extensive simulations.
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Smirnov, Yu M., B. M. Kenzhin, N. S. Smakova, and M. A. Zhurunova. "Optimized control over modes of hydraulic percussion cutting heads of mining machines." Mining informational and analytical bulletin, no. 6 (May 20, 2020): 95–104. http://dx.doi.org/10.25018/0236-1493-2020-6-0-95-104.
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The main cause of the disagreement between the actual and calculated output data of hydraulic percussion mining machines is the erroneous feed of manipulation signals by the control units. For the maximal fitting of the calculated and actual figures, the continuous method of control action using the third time derivative of the law of motion of the main function element is accepted, namely, the accuracy. The mathematical models of control using displacement, velocity and acceleration are developed. The service factors of mining machines are found. Based on the theory of control and the mathematical logic theory, the logical circuits of formation of manipulation signals in each phase of the working cycle are developed. The main elements are converters, integrators and accumulators ensuring decomposition of elements of the logical circuits and further generation of appropriate control action. It is found that the simplest way is to generate the control action for acceleration of the key function element. For the developed circuits, it is recommended to use general charts of the control action change, implementable for a certain design of hydraulic percussion cutting heads in certain operating conditions.
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Liu, Jun Long, and Jing Hui Dai. "Simulation Research of the Direct Driving Active Mass Driver System." Applied Mechanics and Materials 602-605 (August 2014): 1287–90. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1287.
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In order to solve the problem of the traditional AMD(Active Mass Drive system), the DDVC(DAMD,Direct Driving Volume Control) AMD is presented in this paper. Firstly, the mathematical models of the electric motor, hydraulic power system and the hydraulic actuators are constructed respectively. Then, the whole model integrated with different parts is analyzed. Finally, the critical factors which can affect the dynamic characteristics are introduced by using numerical simulation. The results show that the new system has a good performance.
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Wang, Zhong Wen, Rui Zhen Duan, Wan Li Xu, Fu Chun Tao, and Xiao Qiu Xu. "Research on Control Strategy of Oil Film Stiffness Control System of Hydrostatic Center Frame." Applied Mechanics and Materials 274 (January 2013): 629–33. http://dx.doi.org/10.4028/www.scientific.net/amm.274.629.
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Design a new type of electro-hydraulic servo control system of oil film in hydrostatic center frame, regulate and control oil film thickness adopting various controllable oil chambers, build mathematical models of control system and carry on system model identification and verification. Propose a control strategy about fuzzy sliding model variable structure, and it is applied in the model achieved by identification, adopt the method of fuzzy control system approximating equivalent control and design switching controller based on fuzzy control gain dynamic regulation, which could inhabit buffeting existing in sliding model variable structure control. Simulation results show that the controller can’t only effectively inhabit buffeting and reduce steady-state error, but also has strong robustness for structure parameter uncertainty.
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Ye, Min, Quan Wang, and Shengjie Jiao. "RobustH2/H∞Control for the Electrohydraulic Steering System of a Four-Wheel Vehicle." Mathematical Problems in Engineering 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/208019.
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To shorten the steer diameter and to improve the maneuverability flexibility of a construction vehicle, four wheels’ steering system is presented. This steering system consists of mechanical-electrical-hydraulic assemblies. Its diagram and principle are depicted in detail. Then the mathematical models are derived step by step, including the whole vehicle model and the hydraulic route model. Considering the nonlinear and time-varying uncertainty of the steering system, robustH2/H∞controller is put forward to guarantee both the system performance and the robust stability. TheH∞norm of the sensitive function from the parameter perturbation of the hydraulic system to the yaw velocity of the vehicle is taken as the evaluating index of the robustness and theH2norm of the transfer function from the external disturbance to the steering angle of the wheel as the index of linear quadratic Gaussian. The experimental results showed that the proposed scheme was superior to classical PID controller and can guarantee both the control performance and the robustness of the steering system.
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Berestovitsky, Erlen Grigorievich, and Michael Solovyev. "SIMULATION OF ACOUSTIC WAVE PROPAGATION IN HYDRAULIC CONTROL SYSTEMS WITH OBTAINING SPECTRAL CHARACTERISTICS OF SOUND POWER DISTRIBUTION IN THE SOFTWARE PACKAGE SIMHYDRAULICS MATLAB." Journal of Dynamics and Vibroacoustics 7, no. 1 (January 17, 2021): 21–27. http://dx.doi.org/10.18287/2409-4579-2021-7-1-21-27.
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Modern hydraulic systems are subject to stringent noise and vibration requirements. In the existing scope of work a lot of attention is paid to a variety of factors, often without taking into account their mutual influence. In General, they can be divided into schematic design, system and principle. Currently, the development of science and technology is at a level where further improvement of the acoustic quality of individual elements and systems as a whole is possible in the study of emerging processes at the intersection of Sciences. In this regard, the paper considers the possibility of modeling wave processes in hydraulic control systems with the subsequent obtaining of acoustic characteristics, which is a joint use of the mathematical apparatus of the control theory and methods of acoustics. The simhydraulics Matlab software package is considered as one of the most suitable means of solving the tasks. Along with mathematical models of control system elements, the paper proposes acoustic models of elements that are taken into account when modeling transients in the system. Based on the results obtained, additional criteria for assessing the quality of management systems are proposed.
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Liu, Jun Long, and Jing Hui Dai. "Model and Simulation of New Driving Active Mass Driver System." Advanced Materials Research 1079-1080 (December 2014): 922–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1079-1080.922.
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Aimingto improve the shortcomings of the AMD control system, new direct drivingactive mass driver (DAMD) is developed.The mathematical models of hydraulic power mechanismand hydraulic actuator of DAMD are set up, which leads to the whole equation ofrotation speed-drive force is constructed and the rotational speed of the pump(the driving voltage of servo motor) as input and the active control force asoutput is used. From the above derivation and analysis, the state equation forcontroller structure-DAMD control system is presented. Numerical analysis iscarried out on the structure responding control of the DAMD control system structurewhich is a top designed study object under earthquake load action. Results showthat in some degree,DAMD control system can be used to substitute thetraditional AMD control system for large-span structure to realized activecontrol of structural vibration.
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Novitsky, Nikolay. "Mathematical modeling of hydraulic chains as cyber-physical objects." E3S Web of Conferences 216 (2020): 01091. http://dx.doi.org/10.1051/e3sconf/202021601091.
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The article attempts to substantiate a new direction of scientific research of pipeline systems (PLS) of the energy sector as cyber-physical objects. The relevance of this direction is determined by the practical formation of new properties of PLSs in the process of their renovation, intellectualization and digitalization, along with the absence of a general theory of classification of the goals pursued, emerging problems and solution methods. It is proposed to base such studies on the theory of hydraulic circuits, the subject of which is the general methods of mathematical modelling, calculation and optimization, applicable in principle for any PLS (heat, water, oil and gas supply, etc.). The concepts of controlled and cybernetic hydraulic circuit are introduced as a new object of study of this theory. The content of new classes of problems of research and modelling of hydraulic circuits as cybernetic is revealed. The characteristics of the available results in the field of methods of analysis and synthesis of PLSs as cyber-physical objects are given. Mathematical models and methods of analysis of the consequences of regime control in conditions of stochastic of external influences and uncertainty of the internal state are presented. A set of indicators for the integral assessment of the controllability of the PLS is proposed, reflecting the main aspects of management: admissibility, reliability and efficiency. Integral indices of PLS identifiability and methods of their calculation are proposed. The interrelation of these indicators, which can be used to develop methods of analysis, synthesis, norms and standards of controllability and identifiability, as the main cybernetic properties of PLS, is disclosed.
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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.
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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.
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Allen, R. F., T. Davies, and C. D. Horn. "The design of a control system for small hydraulic models." Measurement Science and Technology 3, no. 11 (November 1, 1992): 1098–102. http://dx.doi.org/10.1088/0957-0233/3/11/014.
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Yang, Chi Fu, Shu Tao Zheng, Peter O. Ogbobe, and Jun Wei Han. "Approximate Feedback Linearization Control for High Precision Hydraulic Parallel Machine Tool." Advanced Materials Research 148-149 (October 2010): 126–29. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.126.
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Traditional feedback linearization approach (TFL) requires a priori knowledge of plant, which is difficult and the computational efficiency of controller is low due to complex dynamics of plant. In order to improve the tracking performance of hydraulic parallel machine tool and limit the drawbacks of TFL, a novel approximate feedback linearization approach is proposed in this paper. The mathematical models of hydraulic parallel machine tool are established using Kane method and hydromechanics. The approximate feedback linearization control is designed for the parallel machine tool in joint space, with the position and the stored data in the previous time step are employed, as a learning tool to yield improved performance. Under Lyapunov theorems, the stability of the presented algorithm is confirmed in the presence of uncertainties. Simulation results show the proposed control is readily and effective to realize path tracking, it exhibits excellent performance and high efficiency without a precision dynamics of plant. Moreover, the presented algorithm is well suitable for most industrial applications.
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Xia, Bi Zhong, Ping Fa Feng, and Hua Yong Yang. "Modeling and Analysis on Servo Adjustment of Bidirectional Variable Displacement Pump in Hydraulic Drive System of the Cutter Head in a Shield Tunneling Machine." Applied Mechanics and Materials 44-47 (December 2010): 1380–86. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.1380.
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Based on introduction of the basic configuration, working features of hydraulic drive system of the cutter head in a shield machine, the internal structure of the bidirectional variable displacement pump, BVDP, as the kernel element in the above hydraulic system, is depicted and compared with the ordinary variable plunger pump. Then the working principle and process of hydraulic pilot operated servo displacement adjustment about the BVDP are discussed in detail, and then the mathematical models and its transfer functions of the positive and negative displacement adjustments are established respectively. Also, the relationships between the primary performance indices such as stability condition, positioning stiffness, steady-state error, as well as initial control pressure and system parameters are analysis and concluded.
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Zhu, Zhen, Xiang Gao, Daoyuan Pan, Yu Zhu, and Leilei Cao. "Study on the Control Strategy of Shifting Time Involving Multigroup Clutches." Mathematical Problems in Engineering 2016 (2016): 1–17. http://dx.doi.org/10.1155/2016/9523251.
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This paper focuses on the control strategy of shifting time involving multigroup clutches for a hydromechanical continuously variable transmission (HMCVT). The dynamic analyses of mathematical models are presented in this paper, and the simulation models are used to study the control strategy of HMCVT. Simulations are performed in SimulationXplatform to investigate the shifting time of clutches under different operating conditions. On this basis, simulation analysis and test verification of two typical conditions, which play the decisive roles for the shifting quality, are carried out. The results show that there are differences in the shifting time of the two typical conditions. In the shifting process from the negative transmission of hydromechanical ranges to the positive transmission of hydromechanical ranges, the control strategy based on the shifting time is switching the clutches of shifting mechanism firstly and then disengaging a group of clutches of planetary gear mechanism and engaging another group of the clutches of planetary gear mechanism lastly. In the shifting process from the hydraulic range to the hydromechanical range, the control strategy based on the shifting time is switching the clutches of hydraulic shifting mechanism and planetary gear mechanism at first and then engaging the clutch of shifting mechanism.
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Wu, Wen Hai, Jian Ke, Huan Long Liu, Yu Lan Yang, and Hui Zheng. "Study on Energy Saving of Hybrid Hydraulic Excavator." Applied Mechanics and Materials 312 (February 2013): 158–62. http://dx.doi.org/10.4028/www.scientific.net/amm.312.158.
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For the high energy consumption and poor emission of a medium-sized hydraulic excavator, energy consumption point is analyzed combined with the advantages of the electric hybrid system. The energy recovery schematic of the system is designed. Mathematical models of the slewing system are established and theoretical simulation is conducted, and it is compared with the traditional structure. The velocity, displacement, and energy consumption curves of the two systems are concluded under the same conditions. The comparison shows that: energy saving of the electric hybrid slewing system is 37.27% compared with the traditional system. And the electric hybrid slewing system has the characteristics of the better control function and the higher energy utilization.
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Qian, Yu, Lin Wang, Zhun Cheng, Yirong Zhao, Xingwei Wang, and Zhixiong Lu. "Research on Optimal Oil Filling Control Strategy of Wet Clutch in Agricultural Machinery." Actuators 11, no. 11 (October 30, 2022): 315. http://dx.doi.org/10.3390/act11110315.
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To improve the wet clutch engagement quality, which is widely used in agricultural machinery, the oil filling control strategy of a wet clutch is studied based on the method of simulation and experiment in detail in this paper. Firstly, this paper carries out the dynamic analysis of the wet clutch engagement process, establishes the mathematical model of the mechanical domain and the hydraulic domain of the hydraulic execution system, and designs the backstepping oil pressure controller. The controllability of the output oil pressure of the clutch hydraulic actuator is verified on the joint simulation platform of Matlab/Simulink (Version R2017b, MathWorks, Natick, MA, USA) and AMESim (Version 2019.1, Simcenter Amesim, Siemens Digital Industries Softwares, Berlin&Munuch, Germany). Then, this paper analyzes the clutch engagement process, extracts five factors affecting the oil filling process, and selects four clutch engagement quality evaluation indexes. An amount of 50 groups of experiments are carried out on the wet clutch oil filling test simulation platform built by SimulationX (Version 3.8, ESI ITI GmbH, Dresden, Germany). The response surface method (RSM) and stepwise regression analysis method are used to explore the mathematical models of the quality evaluation index and influencing factors of the oil filling process. Through 15 groups of random tests, the prediction accuracy of the stepwise regression model and the RSM model of each index is compared, and the models with high accuracy are selected to establish the comprehensive prediction mathematical model of clutch engagement quality, combined with the variance weight method. Finally, according to the working condition of the 3 MPa oil filling pressure studied in this paper, the optimal oil filling control strategy is obtained by the proposed clutch engagement quality prediction model. Under the target condition, when the oil filling rate of stage 1 is the highest and the proportion of phase 1’s duration to the total oil filling time is 69.65%, the oil filling rate of stage 2 is the lowest and the proportion of phase 2’s duration to the total oil filling time is 21.85%, and the proportion of phase 3’s duration to the total oil filling time is 8.51%, the engagement quality of wet clutch is the best. The research method of wet clutch optimal oil filling control strategy proposed in this paper provides a reliable method for the ride comfort research of agricultural machinery and clutch control.
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Rutkevych, Volodymyr, Serhiy Shargorodskiy, Vitaliy Kushnir, and Oleksandr Ostapchuk. "DETERMINATION OF THE RANGE OF SPEED REGULATION OF WORKING BODIES OF THE MECHANISM FOR SEPARATION OF STEM FEEDS BY MATHEMATICAL MODE." ENGINEERING, ENERGY, TRANSPORT AIC, no. 2(117) (August 30, 2022): 135–45. http://dx.doi.org/10.37128/2520-6168-2022-2-14.
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The issue of increasing the efficiency and reducing the energy consumption of the technological operation of unloading stem fodder (silage and haylage) from trench storage by block-batch method, due to the development and justification of parameters and modes of operation of the adaptive hydraulic drive system. Recommendations for determining the range of speed control of the working bodies of the mechanism for separation of stem forages on the basis of the developed system of hydraulic actuators of the separator mechanism with maintenance of energy saving mode of the pumping station and investigated nonlinear mathematical models mechanism and features of functioning of executive hydraulic motors of drives of the cutting mechanism in the mode of adaptation to real character of process of separation of a stalk forage. According to the results of mathematical modeling rational values of parameters of the developed hydraulic system of the mechanism for separation of a stalk forage corresponding to area of steady work of system are established, influence of components of hydraulic units of system of hydraulic drives of the separator mechanism regulation of speeds of the working bodies which are put in action by executive hydraulic motors. Based on theoretical and experimental studies, it was found that reducing the width of the working edges of the spool leads to the most effective expansion of the technological range of speed control of the separation mechanism driven by the hydraulic motor - cutting mechanism and hydraulic cylinder - drive P - shaped frame. As a result of research of influence of parameters of the developed hydraulic system of the mechanism for separation of stem forages on the range of technical regulation of speed of working bodies, constructive and technological parameters of the developed hydraulic drive are revealed. Determining the most optimal values of these parameters will increase the sensitivity and efficiency of the proposed hydraulic drive mechanism for the separation of stem forage. According to the results of the research, recommendations for the choice of structural and technological parameters of the developed hydraulic system of the mechanism for the separation of stem forages are provided.
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Oshikawa, Hideo. "A Simple Mathematical Model for Flood Control by a Dry Dam." Journal of Sustainable Engineering: Proceedings Series 1, no. 2 (September 30, 2019): 207–17. http://dx.doi.org/10.35793/joseps.v1i2.29.
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At the same time that the estimated risk of natural disasters is increasing due to global warming, the capacity to prevent disasters in Japan has been weakened due to infrastructure degradation and population aging. To reduce the damage caused by flooding, flood control dams without a slide gate in a spillway, known as “dry dams,” have been planned and built on some sites in Japan. In this study, a simple mathematical model for flood control by a dry dam is proposed, aiming to encourage the construction of such dams. An implicit integral equation that is based on the continuity equation and simulates flood control by a dry dam is analytically derived. This equation can be easily solved by a spreadsheet program, making the mathematical models widely accessible, particularly to hydraulic engineers and students. The model’s results are compared with laboratory experimental results and the output of a numerical simulation. The results show that the accuracy of the model is quite good, especially in its prediction of the maximum water level of dam reservoirs, meaning that the peak discharge during a flood can be predicted to high accuracy by using this simple mathematical model.
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Mazur, I., and M. Shcherbinin. "Investigation of dynamic processes in the hydraulic system of clamping the staffs of the segment unwinder of the unit of aggregation of rolls pipe welding machine 20-114." System technologies 1, no. 138 (March 30, 2022): 98–114. http://dx.doi.org/10.34185/1562-9945-1-138-2022-09.
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In the technological line for the production of small diameter pipes used segment un-winder staffs with a cantilever drum and additional support. The experience of its operation has shown that one of its main shortcomings is the unsatisfactory operation of the hydraulic system clamping staffs. In the hydraulic clamping system of the staffs there are increased dynamic loads, which lead to the failure of components and elements of the hydraulic system. The layout of the hydraulic clamping system of the headquarters is made for design and technological rea-sons, without taking into account the influence of pipeline lengths on the nature of dynamic processes in the hydraulic system. In addition, the hydraulic system uses spool hydrodistributors with electro-hydraulic control, the operation time of which is practically not subject to regulation. Based on the analysis of known mathematical models for the study of dynamic processes in hydraulic systems, it was concluded that as a mathematical model that takes into account the design and operation of the hydraulic clamping system staffs finite-difference method in a sys-tem of ordinary differential equations with boundary conditions described by algebraic equations. A basic dynamic model has been created, which allows to analyze with high relia-bility the behavior of the hydraulic system of the clamping mechanism of the staff in the segment unwinder of the rolls, which is exposed to different nature in a wide range of mode parameters. Simulink MATLAB software environment was used to effectively solve this problem. During the implementation of the mathematical model, a study of the modes of operation of the hydraulic system of the clamping mechanism of the staff was performed. It was found that at the end of the working and reverse strokes of the clamping mechanism of the roll in the end posi-tions there are dynamic loads in the hydraulic system that reach the maximum allowable values. In addition, it was found that during the acceleration of the piston of the hydraulic cylinder during operation and reverse, although there are no dangerous loads, but there are rapid fluctuations in pressure in the cavities of the hydraulic cylinder. Theoretical studies of the modes of operation of the hydraulic clamping system of the staff in the segment unwinder with different operating times of the control valve. As a result of the study of transients in the unwinding hydraulic system with different operating times of the hydraulic distributor, its ra-tional operating time was recommended, which is 0.20 seconds when opening and 0.15 sec-onds when closing.
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Ramos, Nilton de Freitas Souza, Alisson Carraro Borges, Eder Carlos Lopes Coimbra, Gustavo Castro Gonçalves, Ana Paula Ferreira Colares, and Antonio Teixeira de Matos. "Swine Wastewater Treatment in Constructed Wetland Systems: Hydraulic and Kinetic Modeling." Water 14, no. 5 (February 22, 2022): 681. http://dx.doi.org/10.3390/w14050681.
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The use of constructed wetland systems (CWS) is presented as an alternative for the treatment of effluents since these have reduced implementation costs and relative ease of operation. The present research was undertaken to evaluate to study the hydrodynamic and the fitting of first-order mathematical kinetic models for the removal of pollutants in CWS. Three CWS were built, using expanded clay as filter support: one cultivated with Polygonum punctatum (CWSw), another cultivated with Chrysopogon zizanioides (CWSV), and a control unit (CWSc). The actual retention time was 3.12 days in the CWSc, whereas, in the CWSw and CWSv, we observed values of 4.14 and 4.11 days, respectively. The dispersion values were high in all CWS. The values of chemical oxygen demand (COD) across the length of the CWS were used to fit the kinetic models that describe the first-order decay of organic matter over the CWS. The models that showed a better fit to the experimental data were the plug-flow with residual concentration, the continuous stirred tank reactor, and Shepherd’s models.
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DAVLETSHIN, Filyus F., and Ramil F. SHARAFUTDINOV. "INVESTIGATION OF THE NON-STATIONARY TEMPERATURE FIELD IN A RESERVOIR WITH A HYDRAULIC FRACTURING BASED ON AN ANALYTICAL MODEL." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 7, no. 3 (2021): 8–24. http://dx.doi.org/10.21684/2411-7978-2021-7-3-8-24.
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Currently, well temperature studies are widely used to solve various problems of control and monitoring of hydraulic fracturing. Temperature data measured in production wells during and after hydraulic fracturing provide important information about non-stationary filtration and thermal processes that are sensitive to fracture parameters — position and orientation, geometry and filtration characteristics. Mathematical models developed for calculating non-stationary pressure and temperature fields with known geometry and filtration-capacitive properties of the fracture and reservoir, in the general case, can be numerical and analytical. In the quantitative interpretation of temperature measurements and solving inverse problems for estimating fracture parameters, the speed of calculating the temperature field is important, in this regard, the development of analytical mathematical models of non-isothermal filtration in a reservior with a hydraulic fracturing is relevant. The paper presents the results of a study of a non-stationary formation temperature field in a reservoir with a hydraulic fracture based on an analytical model. The developed analytical model takes into account convective heat transfer, heat and mass transfer between the fracture and the formation, thermodynamic (adiabatic and Joule — Thomson) effects. To control the calculation correctness and adequacy of the temperature field, the analytical solution was compared with numerical calculations in the Ansys Fluent software package. The non-stationary temperature formation features of the fluid flowing into the well in the constant withdrawal mode at various parameters of the fracture (width and permeability) are investigated. It was found that the temperature of the fluid flowing into the well increases in inverse proportion to the width and permeability of the fracture, and in the first hour after putting the well into operation, negative dynamics of the flowing liquid temperature is observed, the duration of which increases with the growth of the fracture width.
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Yang, Mingkun, Gexin Chen, Jianxin Lu, Cong Yu, Guishan Yan, Chao Ai, and Yanwen Li. "Research on Energy Transmission Mechanism of the Electro-Hydraulic Servo Pump Control System." Energies 14, no. 16 (August 10, 2021): 4869. http://dx.doi.org/10.3390/en14164869.
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The electro-hydraulic servo pump control system (EHSPCS) is a volume control system that uses a permanent magnet synchronous motor (PMSM) with a fixed displacement pump to directly drive and control the hydraulic cylinder. The energy transmission law of the system is very complicated due to the transformation of electrical, mechanical and hydraulic energy as well as other energy fields, and qualitative analysis of the energy transfer efficiency is difficult. Energy transfer analysis of the EHSPCS under different working conditions and loads is proposed in this paper. First, the energy flow transfer mechanism was analyzed, and the mathematical and energy transfer models of the key components of the system were established to explore the energy characteristic state transition rule. Second, a power bond diagram model was built, its state equation and state matrix were deduced, and a system simulation model was built. Finally, combined with the EHSPCS experimental platform, simulation experiments were carried out on the dynamic position following and steady-state position holding conditions of the system, and the variation rules of the power of each energy characteristic state and the system energy transfer efficiency under different loads were obtained. The research results provide a foundation for the study of power matching and energy-saving mechanism of the EHSPCS.
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Pan, J., G. L. Shi, and X. M. Zhu. "Force tracking control for an electro-hydraulic actuator based on an intelligent feed forward compensator." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 4 (April 1, 2010): 837–49. http://dx.doi.org/10.1243/09544062jmes1795.
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This article presents a scheme for the control of an electro-hydraulic passive force tracking system using the compound controller with an intelligent feed forward compensator (IFFC), which is designed as a test equipment to reproduce on-ground aerodynamics load for reverse thrust system on a certain kind of plain. Through detailed analysis, the mathematical and simulation models are established. Since the conventional proportion integration (PI) method is unsatisfactory due to its bad adaptability to the parametric uncertainties, an IFFC with an off-line self-tuning mechanism is proposed. The related simulations are made and the results show that the compound controller will have good performance after training even though the parameters of the PI part are not optimal. To validate the feasibility of the proposed control strategy, the experiments are carried out on an electro-hydraulic test platform and the experimental results demonstrate the effectiveness of the proposed controller with IFFC for different tracking tasks.
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Yang, Shi-Bin, Li-Bao Wang, and Dan Xu. "Computational analysis on actuator failures of flexible aircraft." International Journal of Computational Materials Science and Engineering 07, no. 01n02 (June 2018): 1850014. http://dx.doi.org/10.1142/s2047684118500148.
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A coupled model of aeroservoelasticity and hydraulic actuator used for failure simulation is presented. The mathematical model composites rigid-body modes, elastic modes, control surface modes, unsteady aerodynamic forces and failure models (jam, loss of control (LOC), oscillatory failure, and hydraulic fluid leakage). A clear framework of coupling method of airplane aeroelastic equation and control surface dynamic equation is provided to study the impacts of surface failures on rigid-elastic motion of airplane. The coupled model is shown to be effective in evaluation of gust response in both discrete gust and continuous turbulence conditions compared with results obtained from the 3-order simplified actuator. Examples of gust load alleviation (GLA) system with LOC of ailerons are given. Results show that total loss of function of GLA system is caused by the LOC. With continuous turbulence excitation, the failure loads is several times larger than that without GLA system.
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Hui, Ji, Nie Song-Lin, and Bai Xiao-Rong. "Simulation on mechanism of contamination mitigation through Higee and hydrocyclone techniques in fluid power system." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 1 (December 13, 2016): 77–93. http://dx.doi.org/10.1177/0954408916684161.
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In this study, an innovative Higee hydraulic oil purification device capable of removing the solid particle contaminants and water moisture simultaneously is developed for dealing with the contamination control problem of fluid power systems. The purification device is considered as a combination of two units (hydrocyclone separator and rotating packed bed) according to different separation functions. The mathematical models about the migration regularity and dynamic behavior of different phases have been established, in which discrete phase model model is employed to simulate the solid particles – hydraulic oil separation, and Eulerian model is selected as the multiphase simulation model to simulate the hydraulic oil – water moisture separation. Simulation results demonstrate that the hydrocyclone separator can remove solid particles of 5 to 15 µm, while the rotating packed bed can mitigate water moisture. The results indicate that the developed Higee hydraulic oil purification device can provide an effective and efficient manner for controlling the contamination level of fluid power systems.
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Kotzev, A., D. B. Cherchas, P. D. Lawrence, and N. Sepehri. "Generalized predictive control of a robotic manipulator with hydraulic actuators." Robotica 10, no. 5 (September 1992): 447–59. http://dx.doi.org/10.1017/s0263574700010651.
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SUMMARYThis paper presents some aspects of the behavior of hydraulically actuated heavy duty manipulators. This category of manipulators is used extensively in large resource based industries and any improvement in efficiency may result in major financial benefits. In this paper an adaptive control algorithm is used for a two rigid link manipulator driven by hydraulic actuators. The dynamic model of the manipulator is derived as well as the models of the hydraulic actuators including compliance, dead time and full dynamics of the servo valves. An adaptive control algorithm is considered since changes occur on-line in the system's parameters. The adaptive algorithm used is Generalized Predictive Control (GPC). The GPC uses a controlled autoregressive integrated moving average (CARIMA) type model and a cost function that minimizes a predicted future output error and future weighted control inputs to the plant, resulting in a sequence of future control increments. The procedure, in this work, does not separate the hydraulic actuator and the link dynamics into separate sub-systems, but controls them as one system. The changes in the system's parameters due to the hydraulics or the link dynamics can be estimated and the coefficients of the model adjusted without the necessity of identifying the exact cause of the changes.It was found in this work that the variations of the GPC control horizon can lead to faster response during transients and significantly reduced overshoot in the nonlinear hydraulic actuation system. An on-line change of the maximum output horizon is also introduced.This work shows the analysis and results of a two link manipulator with hydraulic actuators. It can be implemented on any hydraulically actuated manipulator with any number of links and actuators.Numerical simulations are performed on a Vax 3200 computer and the results are presented.