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Статті в журналах з теми "Military Hydraulic drive Computer simulation"
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Huang, Guoqin, Juncheng Mi, Cheng Yang, and Jin Yu. "CFD-Based Physical Failure Modeling of Direct-Drive Electro-Hydraulic Servo Valve Spool and Sleeve." Sensors 22, no. 19 (October 6, 2022): 7559. http://dx.doi.org/10.3390/s22197559.
Повний текст джерелаАнотація:
Direct-drive electro-hydraulic servo valves are used extensively in aerospace, military and control applications, but little research has been conducted on their service life and physical failure wear. Based on computational fluid dynamics, the main failure forms of direct-drive electro-hydraulic servo valves are explored using their continuous phase flow and discrete phase motion characteristics, and then combined with the theory of erosion for calculation. A mathematical model of the direct-drive electro-hydraulic servo valve is established by using Solidworks software, and then imported into Fluent simulation software to establish its physical failure model and carry out simulation. Finally, the physical failure form of the direct drive electro-hydraulic servo valve is verified by the simulation results, and the performance degradation law is summarized. The results show that temperature, differential pressure, solid particle diameter and concentration, and opening degree all have an impact on the erosion and wear of direct-drive electro-hydraulic servo valves, in which differential pressure and solid particle diameter have a relatively large impact, and the servo valve must avoid working in the range of high differential pressure and solid particle diameter of 20–40 um as far as possible. This also provides further theoretical support and experimental guidance for the industrial application and life prediction of electro-hydraulic servo valves.
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Popov, A. Y. U. "Simulation modeling of the volumetric hydraulic drive." Traktory i sel hozmashiny 85, no. 3 (June 15, 2018): 45–53. http://dx.doi.org/10.17816/0321-4443-66397.
Повний текст джерелаАнотація:
In the design of a variety of the modern agricultural machines, the hydraulic drive with reciprocating motion for lifting, lowering and moving the working bodies has obtained a wide application. One of the important stages in the design of hydraulic drives and transmissions is a simulation. In connection with the laboriousness of carrying out the full-scale experiment and the cumbersome calculation of mathematical models of hydrosystems, as well as the development of the computing machinery, the simulation modeling has obtained a widespread usage. This type of computer simulation allows to investigate complex systems based on the development of multilink factor models with the visualization of a numerical experiment. The article presents the procedure for the simulation modeling of dynamic processes occurring in the volumetric hydraulic drive. The model is developed on the basis of standard libraries of the computing system MATLAB Simulink. The volumetric hydraulic drive is presented in the form of a structural model and consists of interconnected blocks that on the base of differential equations modeling the operation of a pumping station with a mechanical drive, a safety valve, a three-section four-line hydraulic distributor, double-acting power cylinder with special rod, a hydraulic tank. During the calculation of the simulation model takes into account a change of the modulus of elasticity of the fluid depending on the pressure in the hydraulic system, the parameters of the working fluid, the stiff stop when the extreme positions are reached by the rod of the hydraulic cylinder, the friction between the moving parts in the power hydrocylinder. The developed program allows to simulate working processes at the design stage and obtain the necessary data on the dynamic properties of the hydraulic system in all modes of operation, to demonstrate in the form of graphs and oscillograms, to simplify the analysis of transient processes in the hydraulic system, and also to select the rational design parameters of constituent elements of the volumetric hydraulic drive.
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Zhu, Chenhui, Hongmei Zhang, Wanzhang Wang, Kang Li, and Wanru Liu. "Robust control of hydraulic tracked vehicle drive system based on quantitative feedback theory." International Journal of Distributed Sensor Networks 16, no. 2 (February 2020): 155014772090783. http://dx.doi.org/10.1177/1550147720907832.
Повний текст джерелаАнотація:
To improve the control precision of the drive system of hydraulic tracked vehicles, we established a mathematical model of the drive system based on the analysis of structural characteristics of the high-clearance hydraulic tracked vehicles and the dual-pump dual-motor drive system and developed a control strategy based on the quantitative feedback theory. First, the mutual independence of the two motor channels was achieved through channel decoupling. Then, the loop-shaping controller and the pre-filter were designed for the two channels. The result of a simulation experiment indicates that the proposed control method is very effective in suppressing external uncertainties and smoothening the speed-switching process of the hydraulic motor. Finally, an hydraulic tracked vehicle steering experimental test was carried out. The results show that under two different steering modes, the maximum standard deviation of the output speeds of the inner and outer motors of the hydraulic tracked vehicle is only 0.42, which meets the performance requirement on the hydraulic motor speed. The average steering track radii of the geometric centers of the inner and outer tracks are 1.828 and 0.033 m, respectively, and the relative errors are 1.56% and 3.19%, respectively. This demonstrates that the proposed control method achieves satisfactory results in the robust control of the hydraulic tracked vehicle drive system. It provides some references for the future control research of the hydraulic servo drive system of the high-clearance hydraulic tracked vehicles.
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Liu, Tong. "Research on stability of hydraulic system based on nonlinear PID control." Nonlinear Engineering 11, no. 1 (January 1, 2022): 494–99. http://dx.doi.org/10.1515/nleng-2022-0222.
Повний текст джерелаАнотація:
Abstract In order to avoid the interference of the excavator hydraulic control system by external factors, the output stability of the hydraulic control system has to be improved. The method introduces a nonlinear Proportional integral differentiation (PID) controller with deviation correction parameters through the simulation verification of the control effect and the creation of excavator hydraulic drive diagram. PID, whose full English name is proportional integral derivative, is a mathematical and physical term. The controller is modeled in Matlab/Simulink. Finally, the whole hydraulic system is co-simulated by the interface of AMESim and Matlab. The simulation results show that the system model realizes the co-simulation through the interface combination of the two software, which is more accurate than the traditional PID control, and the pressure and flow fluctuation are smaller, which can suppress the interference of external load mutation, and improve the stability of the hydraulic drive output of the excavator. The validity of the experiment is verified.
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Yaryzhko, Alexander. "MODELING A FLUID POWER DRIVE OF THE EXCAVATOR EQUIPMENT." Bulletin of Kharkov National Automobile and Highway University 1, no. 92 (March 4, 2021): 178. http://dx.doi.org/10.30977/bul.2219-5548.2021.92.1.178.
Повний текст джерелаАнотація:
Problem. The hydraulic drive of modern construction and road machines is quite complex, and it takes a lot of time and effort to model the entire drive in full. However, improving the quality of design with reducing terms and costs becomes possible only with the use of modern technologies, computer hardware and software. The existing models of hydraulic system working processes in the physical modeling environment SimHydraulics are presented by block diagram layouts from standard library elements (slide valve, hydraulic pump, hydraulic cylinder, safety and reverse valves, hydraulic locks, etc.). However, they do not consider the influence of time-varying external forces, which are a reaction during transient processes in multi-link mechanical systems. Goal. The aim of the work is to develop a simulation model of the fluid power drive of the excavator working equipment mechanical system in the MATLAB & SimHydraulics package for studying the dynamics of transient processes of multilink mechanical objects. Methodology. The article describes an example of developing a physical simulation model of the excavator working equipment fluid power drive in the SimHydraulics package. Using the real technical characteristics of the hydraulic equipment of the Borex 2201 excavator, the performance of the developed model was checked and the power characteristics of the actuators were determined. Originality. Using the blocks described in the article, a simulation model of the interaction of the excavator working equipment mechanical system with its fluid power drive can be created. Practical value. The model proposed makes it possible to obtain values characterizing transient processes, including changes in the value of the generalized coordinates of the characteristic points in the working equipment, the rate of their change, and the effort in the hydraulic cylinder. A visual representation of the manipulator movement can be obtained using the SimScape built-in visualization function. The resulting model allows solving problems of analysis and synthesis of excavator operation control systems.
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Wang, Jing Fu, and Lu Yang Wang. "Simulation Research on Effects of Low Velocity Characteristics to Direct Drive Volume Control Systems." Applied Mechanics and Materials 464 (November 2013): 310–15. http://dx.doi.org/10.4028/www.scientific.net/amm.464.310.
Повний текст джерелаАнотація:
The Direct Drive Volume Control (DDVC) Electro-hydraulic Servo System is a new Electro-hydraulic Servo System. It has the advantages of flexibility of AC servo motor control and high power of hydraulic servo system. Compared with the traditional electro-hydraulic servo system, the DDVC system is efficient, miniaturized integrated, convenient operated and economical. It has been used in many domains, and made great economic benefits. So it is widely considered to be one of the most important developing directions of the hydraulic control system. It will be widely used in more and more areas in the future. With the development of its application, how to improve the trajectory tracking precision of the DDVC system in low velocity motions becomes more important in the field. So that, the level of the low velocity characteristic impacted the system become to an important subject. In this paper, the mathematical mode of AC asynchronism motor Direct Torque Control was established, and the simulation mode was built. In addition, the idealized model of the DDVC system which based on united simulation of AMEsim/Simulink was established, simulation was executed. In order to make the research available, the low velocity characteristic of the DDVC system was also analyzed, and the low velocity characteristic simulation model was built. Computer simulation validated that the friction, the leakage and the mechanical losses are seriously influenced the system performance when the system working on the low velocity mode.
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Жукевич, А. Б., та О. А. Жукевич. "СИНТЕЗ І НАПІВНАТУРНЕ МОДЕЛЮВАННЯ СИСТЕМИ УПРАВЛІННЯ ГІДРОПРИВОДУ З КОВЗНИМИ РЕЖИМАМИ". Open Information and Computer Integrated Technologies, № 87 (30 червня 2020): 121–36. http://dx.doi.org/10.32620/oikit.2020.87.06.
Повний текст джерелаАнотація:
We consider the construction of servo-hydraulic drive of volumetric regulation system control relay type. A volumetric hydraulic actuator is used in agriculture, construction, transport machine, coal harvesters, rigs, airplanes, military machinery, etc. Hydraulic bulk drive have several advantages, most important of which are the possibility of obtaining a great effort, smooth operation, low inertia hydraulic machines, relatively high efficiency (up to 80%), high reliability. At the same time, he has a number of drawbacks, chief of which is the change in the properties of the working liquid during operation and under the influence of external factors. The disadvantages include loss of hydraulic oil, contamination of the liquid during operation. These shortcomings can lead to loss of quality control loss of accuracy, speed of working off of the set of control actions. One of the classes of systems which structurally provide high dynamic accuracy, there are systems operating in the sliding mode. In addition, due to the introduction of sliding mode in some cases it is possible to increase the degree of astaticism of the system, and hence to improve the playback quality of the input job. Proposed the implementation of a control system of hydraulic drive, is invariant to parametric and external disturbances through the use of sliding modes. To study the proposed control system with hydraulic drive constructed model of the developed system, which is the natural object of a hydraulic drive using its mathematical model, at the same time the control system is implemented physically is one that can be used in a real device. Hill simulation has allowed answering the questions of realization of sliding modes when controlling hydraulic drive of volumetric regulation through a DC motor. The behavior of a control system of hydraulic drive when changing the parameters of the control object (the moment of inertia, viscosity), which showed that the change of damping ratio within a wide range (up to 50% of the design) does not disrupt the sliding mode, the quality of the regulatory process does not deteriorate significantly. At the same time, the change to 100% conversion rate can lead to instability of the control system that allows to make a conclusion about the establishment of the position controller on the lesser of the possible damping coefficients. Also a study of digital implementation of the synthesized control law by introducing in the control loop time delay has been carried out, which is possible with the use of microprocessor-based calculator.
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Fang, Delei, Junhong Yang, Jianzhong Shang, Zhuo Wang, and Yong Feng. "A Novel Energy-Efficient Wobble Plate Hydraulic Joint for Mobile Robotic Manipulators." Energies 11, no. 11 (October 26, 2018): 2915. http://dx.doi.org/10.3390/en11112915.
Повний текст джерелаАнотація:
At present, mobile robotic manipulators have been greatly developed. However, these further promotions are limited by a low load capacity and short operation time. The above problems can be improved by using a hydraulic drive mode and increasing the system energy efficiency. In this paper, a novel energy-efficient wobble plate hydraulic joint is presented, which has the characteristics of having a small size, lightweight, large load capacity, and high energy efficiency. Based on the efficiency analysis in traditional robotic manipulators, this paper presents a novel hydraulic joint with a multi-chamber drive structure. Kinematics model and dynamics model are both established for the analysis of the mechanical characteristics, and the functional relationship between the input and output is depicted by numerical simulation. Based on the structural characteristics and control principle, the load matching controller is designed and specific control processes are formulated. Combined with a strategy of load matching, the servo control system is established and the energy-saving effect is verified by simulation. The result shows that the wobble plate hydraulic joint can change connections between a high-pressure circuit and different working chambers, which realizes the match between the output torque and load torque. With the load matching controller, the energy consumption of the wobble plate joint is greatly reduced, which contributes to a considerably improved energy efficiency. The research in this paper not only lays a theoretical foundation for the development of a wobble plate hydraulic joint, but also provides guidance for the improvement of the hydraulic system energy efficiency in mobile robotic manipulators.
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Ma, Guoliang, Kaixian Ba, Zhiwu Han, Zhengguo Jin, Bin Yu, and Xiangdong Kong. "A Mathematical Model Including Mechanical Structure, Hydraulic and Control of LHDS." Robotica 39, no. 7 (January 20, 2021): 1328–43. http://dx.doi.org/10.1017/s0263574720001204.
Повний текст джерелаАнотація:
SUMMARYIn this paper, mathematical models of kinematics, statics and inverse dynamics are derived firstly according to the mechanical structure of leg hydraulic drive system (LHDS). Then, all the above models are integrated with MATLAB/Simulink to build the LHDS simulation model, the model not only considers influence of leg dynamic characteristics on hydraulic system but also takes into account nonlinearity, variable load characteristics and other common problems brought by hydraulic system, and solves compatibility and operation time which brought by using multiple software simultaneously. The experimental results show the simulation model built in this paper can accurately express characteristics of the system.
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Grechikhin, Valeriy V., Galina A. Galka, Anatoliy I. Ozerskiy, and Mikhail E. Shoshiashvili. "The method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning executive elements." MATEC Web of Conferences 226 (2018): 04024. http://dx.doi.org/10.1051/matecconf/201822604024.
Повний текст джерелаАнотація:
The article describes the method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning output element. The method is the evolution of the fundamental positions of the mechanics of continuous media with moving boundaries as applied to the research of non-stationary processes accompanying the operation of hydraulic drive systems with piston hydraulic machines. The method is based on generalized modeling (technical, physical, mathematical and computer), takes into account the peculiarities of mutual influence of electric and hydraulic machines during their joint work as part of the electrohydraulic drive, which raises the level and adequacy of actuators simulation, as well as the reliability of the assessment of their technical condition. The method extends the field of research, improves the accuracy of the calculation of the positioning of the executive elements, taking into account the different dynamic modes of the drives under study.
Дисертації з теми "Military Hydraulic drive Computer simulation"
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League, Richard B. "Bond graph model and computer simulation of a hydrostatic drive test stand." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50042.
Повний текст джерелаАнотація:
A hydrostatic drive test stand was constructed to aid in the instruction of the characteristics of hydrostatic transmissions and to develop a time-varying load in a shaft to compare torque transducers. A mathematical model of the device was derived using the bond graph approach and was implemented using the Advanced Continuous Simulation Language (ACSL). The test stand was used to obtain experimental data to try to refine the model parameters. To facilitate the measurement of system flows, a microprocessor-based digital flow indicator was developed. Steady-state tests were performed at various constant pump swashplate angles; for the dynamic tests, the pump swashplate angle was cycled from zero degrees to 6.5 degrees.Master of Science
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Тези доповідей конференцій з теми "Military Hydraulic drive Computer simulation"
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Huran Liu. "The computer simulation for the hydraulic motor with planetary drive of bevel gear." In 2nd International Conference on Computer and Automation Engineering (ICCAE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccae.2010.5451713.
Повний текст джерела
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Wu, Shuai, Richard Burton, Zongxia Jiao, Juntao Yu, and Rongjie Kang. "Feasibility Study on the Use of a Voice Coil Motor Direct Drive Flow Rate Control Valve." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2631.
Повний текст джерелаАнотація:
This paper considers the feasibility of a new type of voice coil motor direct drive flow control servo valve. The proposed servo valve controls the flow rate using only a direct measurement of the spool position. A neural network is used to estimate the flow rate based on the spool position, velocity and coil current. The estimated flow rate is fed back to a closed loop controller. The feasibility of the concept is established using simulation techniques only at this point. All results are validated by computer co-simulation using AMESim and Simulink. A simulated model of a VCM-DDV (Voice Coil Motor-Direct Drive Valve) and hydraulic test circuit are built in an AMESim environment. A virtual digital controller is developed in a Simulink environment in which the feedback signals are received from the AMESim model; the controller outputs are sent to the VCM-DDV model in AMESim (by interfacing between these two simulation packages). A LQR (Linear Quadratic Regulator) state feedback and nonlinear compensator controller for spool position tracking is considered as this is the first step for flow control. A flow rate control loop is subsequently included via a neural network flow rate estimator. Simulation results show that this method could control the flow rate to an acceptable degree of precision, but only at low frequencies. This kind of valve can find usage in open loop hydraulic velocity control in many industrial applications.
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Vantsevich, Vladimir V., Jesse R. Paldan, and Jeremy P. Gray. "A Hybrid-Electric Power Transmitting Unit for 4x4 Vehicle Applications: Modeling and Simulation." In ASME 2014 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/dscc2014-5855.
Повний текст джерелаАнотація:
In this paper, a technical concept is described for a hybrid-electric power transmitting unit (HE-PTU) to control the split of power between the drive axles of a 4×4 hybrid-electric vehicle. This new power transmitting unit is a mechatronic systems by its design and uses a planetary gear set and eddy current brake to provide a continuously variable (dynamic) gear ratio that can be integrated into the vehicle driveline between the transfer case and front axle. The paper details the electrical and mechanical characteristics of the device, including its various operation modes, its mathematical model built from the equations of the planetary gear set and eddy current brake, an optimization condition by which the device will be controlled to improve vehicle energy efficiency, as well as its torque and electrical current usage. Computer simulations are performed on a mathematical model of a 4×4 military truck using the power transmitting unit in conjunction with a series hybrid-electric configuration transmission.
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Shusheng, Zang, Zheng Hongtao, Li Shuying, and Sun Haiou. "Research Into the Drive Transition of Combined Diesel or Gas Turbine Plant." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-171.
Повний текст джерелаАнотація:
A small test installation of Combined Diesel or Gas turbine (CODOG) was made, its primary aimed at investigating the changes of various operational parameters of the two engines in the change-over process. First, the computer simulation of this process is carred out in the paper. Variations of torque and rotational speed on the transmission shafts under different rates of fuel supply and the effect of hydraulic coupling on the change-over process are investigated. Then, the comparison is made of variation of speed and torque by PI governing with that by PID governing. The result shows that the rate of increase or decrease of diesel engine fuel supply has significant effect on the variation of torque, and the change of parameters in governing system has markable effect on the speed and torque in change-over process, especially on the peake value of diesel engine torque.
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Xiros, Nikolaos I., Georgios Tsakyridis, Marco Scharringhausen, and Lars Witte. "Control of a DC-DC Boost Converter for Fuel-Cell-Powered Marine Applications." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78171.
Повний текст джерелаАнотація:
Economic factors together with protection laws and policies pertaining to marine pollution drive research for improved power generation. Fuel cells, being fuel efficient and environmentally friendly, could provide a desirable option and suitable alternative to conventional propulsion systems based on fossil fuels or even nuclear fission. Fuel cells are becoming fast a mature technology and employed in many various other areas. Flexibility of special purpose watercraft, power autonomy and modularity can all benefit from the use of fuel cells. Specifically, proton exchange membrane fuel cells are considered among the most promising options for marine propulsion applications. Switching converters are the common interface intermitted between fuel cells and the load in order to provide a stable regulated voltage. DC-DC converters have been widely used since the advent of semiconductors. These devices are typically adopted to accomplish voltage regulation tasks for a multitude of applications: from renewable energy power-plants to military, medical and transportation systems. Nonetheless voltage regulators exhibit the need for consistent closed- and open-loop control. Most common approaches are PID controllers, sliding mode controllers and artificial neural networks that are considered in this work. An artificial neural network (ANN) is an adaptive, often nonlinear system that learns to perform a functional mapping from data. In our approach, a typical example of a fuel cell, a power converter outfitted with an ANN controller, and a resistive load configuration is investigated. Simulation studies are crucial in power electronics to essentially predict the behavior of the device before any hardware implementation. General requirements, design specification together with control strategies can be iteratively tested using computer simulations. This paper shows the simulation results of the full system behavior, as described above, under dynamic conditions. Initially, an open-loop simulation of the system is performed. Next, an appropriately trained ANN is incorporated to the switching model of the DC-DC converter to perform simulations for validation. Conversely, during design and calibration of the ANN controller, instead of the switching model of the DC-DC converter, a trained ANN equivalent is employed.