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Force Control Compensation Method with Variable Load Stiffness and Damping of the Hydraulic Drive Unit Force Control System 被引量:10
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作者 KONG Xiangdong BA Kaixian +3 位作者 YU Bin CAO Yuan ZHU Qixin ZHAO Hualong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第3期454-464,共11页
Each joint of hydraulic drive quadruped robot is driven by the hydraulic drive unit(HDU), and the contacting between the robot foot end and the ground is complex and variable, which increases the difficulty of force... Each joint of hydraulic drive quadruped robot is driven by the hydraulic drive unit(HDU), and the contacting between the robot foot end and the ground is complex and variable, which increases the difficulty of force control inevitably. In the recent years, although many scholars researched some control methods such as disturbance rejection control, parameter self-adaptive control, impedance control and so on, to improve the force control performance of HDU, the robustness of the force control still needs improving. Therefore, how to simulate the complex and variable load characteristics of the environment structure and how to ensure HDU having excellent force control performance with the complex and variable load characteristics are key issues to be solved in this paper. The force control system mathematic model of HDU is established by the mechanism modeling method, and the theoretical models of a novel force control compensation method and a load characteristics simulation method under different environment structures are derived, considering the dynamic characteristics of the load stiffness and the load damping under different environment structures. Then, simulation effects of the variable load stiffness and load damping under the step and sinusoidal load force are analyzed experimentally on the HDU force control performance test platform, which provides the foundation for the force control compensation experiment research. In addition, the optimized PID control parameters are designed to make the HDU have better force control performance with suitable load stiffness and load damping, under which the force control compensation method is introduced, and the robustness of the force control system with several constant load characteristics and the variable load characteristics respectively are comparatively analyzed by experiment. The research results indicate that if the load characteristics are known, the force control compensation method presented in this paper has positive compensation effects on the load characteristics variation, i.e., this method decreases the effects of the load characteristics variation on the force control performance and enhances the force control system robustness with the constant PID parameters, thereby, the online PID parameters tuning control method which is complex needs not be adopted. All the above research provides theoretical and experimental foundation for the force control method of the quadruped robot joints with high robustness. 展开更多
关键词 quadruped robot force control system hydraulic drive unit force control compensation method variable load stiffness and damping simulation
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CONTROL STRATEGY FOR ELECTRO-HYDRAULIC POSITION SERVO SYSTEM WITH GENERALIZED PULSE CODE MODULATION 被引量:1
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作者 LIU Rong PAN Huachen CHEN Ying 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第3期50-53,共4页
A hybrid control strategy has been designed and developed for the electro-hydraulic posi-tion servo control system with generalized Pulse code modulation (GPCM), which is suitable for the area where the work conditi... A hybrid control strategy has been designed and developed for the electro-hydraulic posi-tion servo control system with generalized Pulse code modulation (GPCM), which is suitable for the area where the work condition is poor and a large flow rate is required. It is difficult to control the GPCM system because the system is discrete. With consideration of the stability and speediness of the GPCM position servo control system, a control strategy is developed through the theoretical and ex-perimental analyses. The control strategy integrates the merits of Bang-Bang control, PID control and fuzzy control. With this hybrid control strategy, the electro hydraulic control system has good per-formances, and the servo control is carried out with GPCM through on-off valves. 展开更多
关键词 Generalized pulse code modulation (GPCM) Position control Electro hydraulic control
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CONSTANT WORK-POINT CONTROL FOR PARALLEL HYBRID SYSTEM WITH CAPACITOR ACCUMULATOR IN HYDRAULIC EXCAVATOR 被引量:4
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作者 ZHANG Yanting WANG Qingfeng XIAO Qing FU Qiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第4期505-508,共4页
Limitations of various accumulators in hybrid hydraulic excavator are analyzed. A program using capacitor as the accumulator based on constant work-point control is put forward. A simulating experimental system of hyb... Limitations of various accumulators in hybrid hydraulic excavator are analyzed. A program using capacitor as the accumulator based on constant work-point control is put forward. A simulating experimental system of hybrid construction machinery is established, and experimental study on constant work-point control for parallel hybrid system with capacitor accumulator is carried out using the pressure and flow rate derived from boom cylinder of hydraulic excavator in actual work as the simulating loads. A program of double work-point control is proposed and proved by further experiments. 展开更多
关键词 Hybrid hydraulic excavator Capacitor accumulator Constant work-point control Double work-point control
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HYDRAULIC ACTIVE GUIDE ROLLER SYSTEM FOR HIGH-SPEED ELEVATOR BASED ON FUZZY CONTROLLER 被引量:1
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作者 FENG Yonghui ZHANG Jianwu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第5期68-73,共6页
Increase of elevator speed brings about amplified vibrations of high-speed elevator. In order to reduce the horizontal vibrations of high-speed elevator, a new type of hydraulic active guide roller system based on fuz... Increase of elevator speed brings about amplified vibrations of high-speed elevator. In order to reduce the horizontal vibrations of high-speed elevator, a new type of hydraulic active guide roller system based on fuzzy logic controller is developed. First the working principle of the hydraulic guide system is introduced, then the dynamic model of the horizontal vibrations for elevator cage with active guide roller system and the mathematical model of the hydraulic system are given. A fuzzy logic controller for the hydraulic system is designed to control the hydraulic actuator. To improve the control performance, preview compensation for the controller is provided. Finally, simulation and experiments are executed to verify the hydraulic active guide roller system and the control strategy. Both the simulation and experimental results indicate that the hydraulic active guide roller system can reduce the horizontal vibrations of the elevator effectively and has better effects than the passive one, and the fuzzy logic controller with preview compensation can give superior control performance. 展开更多
关键词 High-speed elevator Horizontal vibrations hydraulic active guide roller system Fuzzy logic control
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OPTIMIZED DESIGN OF HYDRAULIC CONTROL PATTERN OF SYNCHRONOUS SYSTEM IN LARGE SCALE DIE-FORMING HYDRAULIC PRESS
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作者 Tan Jianping Zhong Jue Yan Jian 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1996年第1期125-129,140,共6页
The hydraulic control mode of the synchronous system in Chinese-built 300 MN dieforming hydraulic press was analysed comprehensively.To improve the deficiency of the existing system,a series investigations were put fo... The hydraulic control mode of the synchronous system in Chinese-built 300 MN dieforming hydraulic press was analysed comprehensively.To improve the deficiency of the existing system,a series investigations were put forward,such as the controlling of inclination angular-velocity,the pre-estimating of compensation,the synchronous cylinder's pressure signal protection,ratio pressure control and changing flow control etc,to increase the system's control accuracy and reliability greatly. 展开更多
关键词 synchronous system hydraulic control OPTIMIZATION
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Synchronization control for electro-hydraulic dual-cylinder system based on force/position switching
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作者 程宁波 Wang Liping +1 位作者 Guan Liwen Han Jian 《High Technology Letters》 EI CAS 2013年第3期221-227,共7页
If the rigidity of a mechanism is stiff enough, the position synchronous error of the two cylinders driving one degree-of-freedom (DOF) of the mechanism may be less than the resolution of position sensors. To handle... If the rigidity of a mechanism is stiff enough, the position synchronous error of the two cylinders driving one degree-of-freedom (DOF) of the mechanism may be less than the resolution of position sensors. To handle this synchronization problem this paper proposes a force/position switching scheme, which partitions the two cylinders into a master cylinder and a slave cylinder. The master cylinder is always position tracking controlled by a second-order sliding mode controller and the slave cylinder is integrated with a force tracking controller which is a first order sliding mode controller. When the position tracking error is less than a given value, the slave cylinder switches to be force controlled. Two synchronization control methods are presented based on the switching scheme: the master - master + force/position switching control and the master - slave + force/position switching control. Simulations show that the formance compared with two given proposed synchronization control position-based control methods. methods can get a better per- 展开更多
关键词 synchronization control hydraulic servo control nonlinear control force control sliding mode control
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Design of an aircraft autonomous traction taxiing system based on hydraulic secondary control
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作者 Xiaochao LIU Zhongyi QIU +4 位作者 Hao ZHANG Pengyuan QI Zhenyu WANG Yaoxing SHANG Zongxia JIAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第6期348-359,共12页
At present,aircraft taxiing at ground airports needs to be provided with a thrust by the main engine.The taxiing process is inefficient,has high fuel consumption and serious pollution,and is prone to safety risks.In t... At present,aircraft taxiing at ground airports needs to be provided with a thrust by the main engine.The taxiing process is inefficient,has high fuel consumption and serious pollution,and is prone to safety risks.In this paper,a new configuration of aircraft autonomous traction taxiing system is proposed based on the principle of hydraulic secondary control,in which a hydraulic motor drive device is installed at the front wheels of the aircraft to drive the wheels to rotate forward or backward.Based on this,autonomous taxiing can be realized without relying on the main engines,thus greatly improving airport operation efficiency.Meanwhile,this paper analyzes the influencing factors of the autonomous traction taxiing process,and investigates the parameter matching design of the new configuration system.Besides,this paper develops the ground principle prototype,designs the aircraft longitudinal bonding force observer and the aircraft wheel disturbance moment observer,and proposes the speed control method of the aircraft front wheel autonomous traction taxiing by considering the ground bonding force saturation characteristics.Finally,the ground taxiing test is conducted,and the results show that the new configuration proposed in this paper presents a new solution for aircraft autonomous traction taxiing. 展开更多
关键词 Autonomous traction taxi-ing hydraulic secondary control hydraulic motors Saturation characteristics Disturbance observation Speed control
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Simulation and experimental research of digital valve control servo system based on CMAC-PID control method 被引量:5
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作者 赵劲松 Zhao Zining +2 位作者 Wang Zhipeng Zhang Chuanbi Yao Jing 《High Technology Letters》 EI CAS 2017年第3期306-314,共9页
Digital valve control servo system is studied in this paper. In order to solve the system problems of poor control precision and slow response time,a CMAC-PID( cerebellar model articulation controller-PID) compound co... Digital valve control servo system is studied in this paper. In order to solve the system problems of poor control precision and slow response time,a CMAC-PID( cerebellar model articulation controller-PID) compound control method is proposed. This compound controller consists of two components: one is a traditional PID for the feedback control to guarantee stability of the system; the other is the CMAC control algorithm to form a feed-forward control for achieving high control precision and short response time of the controlled plant. Then the CMAC-PID compound control method is used in the digital valve control servo system to improve its control performance. Through simulation and experiment,the proposed CMAC-PID compound control method is superior to the traditional PID control for enhancing stability and robustness,and thus this compound control can be used as a new control strategy for the digital valve control servo system. 展开更多
关键词 electro-servo system digital hydraulic digital valve CMAC-PID compound control rapid control prototyping technology
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NEW HYDRAULIC ACTUATOR'S POSITION SERVOCONTROL STRATEGY 被引量:3
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作者 KE Zunrong ZHU Yuquan LING Xuan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第5期46-53,共8页
A new hydraulic actuator-hydraulic muscle (HM) is described, and the actuator's features and applications are analyzed, then a position servocontrol system in which HM is main actuator is set up. The mathematical m... A new hydraulic actuator-hydraulic muscle (HM) is described, and the actuator's features and applications are analyzed, then a position servocontrol system in which HM is main actuator is set up. The mathematical model of the system is built up and several control strategies are discussed. Based on the mathematical model, simulation research and experimental investigation with subsection PID control, neural network self-adaptive PID control and single neuron self-adaptive PID control adopted respectively are carried out, and the results indicate that compared with PID control, neural network self-adaptive PID control and single neuron self-adaptive PID control don't need controlled system's accurate model and have fast response, high control accuracy and strong robustness, they are very suitable for HM position servo control system. 展开更多
关键词 hydraulic muscle (HM) Position servocontrol control strategies Subsection PID control Neural network self-adaptive PID control Single neuron self-adaptive PID control
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Identification and optimization for hydraulic roll gap control in strip rolling mill
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作者 孙杰 陈树宗 +3 位作者 韩欢欢 陈兴华 陈秋捷 张殿华 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2183-2191,共9页
In order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control(HGC) system was established. HGC system offline identification scheme was designed for a tandem cold st... In order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control(HGC) system was established. HGC system offline identification scheme was designed for a tandem cold strip mill, the system model parameters were identified by ARX model, and the identified model was verified. Taking the offline identified parameters as the initial values, online identification using recursive least square was carried out with model parameters changing. For the purpose of improving system robustness and decreasing the sensitivity due to model errors, the HGC system based on generalized predictive control(GPC) was designed, and simulation experiments for traditional controller and GPC controller were conducted. The results show that both controllers acquire good control effect with model matching. When the model mismatches, for the traditional controller, the overshot will increase to 76.7% and the rising time will increase to 165.7 ms, which cannot be accepted by HGC system; for the GPC controller, the overshot is less than 8.5%, and the rising time is less than 26 ms in any case. 展开更多
关键词 hydraulic roll gap control MODELING system identification generalized predictive control
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A Multi-mode Electronic Load Sensing Control Scheme with Power Limitation and Pressure Cut-off for Mobile Machinery
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作者 Min Cheng Bolin Sun +1 位作者 Ruqi Ding Bing Xu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第1期157-170,共14页
In mobile machinery,hydro-mechanical pumps are increasingly replaced by electronically controlled pumps to improve the automation level,but diversified control functions(e.g.,power limitation and pressure cut-off)are ... In mobile machinery,hydro-mechanical pumps are increasingly replaced by electronically controlled pumps to improve the automation level,but diversified control functions(e.g.,power limitation and pressure cut-off)are integrated into the electronic controller only from the pump level,leading to the potential instability of the overall system.To solve this problem,a multi-mode electrohydraulic load sensing(MELS)control scheme is proposed especially considering the switching stability from the system level,which includes four working modes of flow control,load sensing,power limitation,and pressure control.Depending on the actual working requirements,the switching rules for the different modes and the switching direction(i.e.,the modes can be switched bilaterally or unilaterally)are defined.The priority of different modes is also defined,from high to low:pressure control,power limitation,load sensing,and flow control.When multiple switching rules are satisfied at the same time,the system switches to the control mode with the highest priority.In addition,the switching stability between flow control and pressure control modes is analyzed,and the controller parameters that guarantee the switching stability are obtained.A comparative study is carried out based on a test rig with a 2-ton hydraulic excavator.The results show that the MELS controller can achieve the control functions of proper flow supplement,power limitation,and pressure cut-off,which has good stability performance when switching between different control modes.This research proposes the MELS control method that realizes the stability of multi-mode switching of the hydraulic system of mobile machinery under different working conditions. 展开更多
关键词 hydraulic control Load sensing MULTI-MODE Power limitation Mobile machinery
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SOLUTION FOR PRESSURE DISTRIBUTION IN SQUEEZE FILM DAMPER WITH ELECTROHYDRAULIC ACTIVE CONTROL
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作者 Li Yunhua Wang Zhanlin Beijing University of Aeronautics and Astronautics Chen Jieli Taiwan Cheng Kung University 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1999年第1期28-32,共5页
Aiming at the problems existed in the squeeze film damper of the rotating machinery utilizing traditional passive dynamic pressure film bearing, a project of dynamic pressure and static pressure hybrid oil film bearin... Aiming at the problems existed in the squeeze film damper of the rotating machinery utilizing traditional passive dynamic pressure film bearing, a project of dynamic pressure and static pressure hybrid oil film bearing with piezoelectric crystal electrohydraulic active control supply orifice hole is proposed. For this kind of hybrid film bearing, the π film assumption can not hold true. In order to solve the pressure distribution, a new kind of solving method is proposed. 展开更多
关键词 hydraulic control Squeeze film damper Rotor dynamics
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Research on Energy Conversion System of Floating Wave Energy Converter 被引量:6
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作者 张亚群 盛松伟 +2 位作者 游亚戈 吴必军 刘洋 《China Ocean Engineering》 SCIE EI CSCD 2014年第1期105-113,共9页
A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydrauli... A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydraulic power take-off system, which suits for the floating wave energy devices, includes hydraulic system and power generation system. The hydraulic control system uses a special“self-hydraulic control system”to control hydraulic system to release or save energy under the maximum and the minimum pressures. The maximum pressure is enhanced to 23 MPa, the minimum to 9 MPa. Quite a few experiments show that the recent hydraulic system is evidently improved in efficiency and reliability than our previous one, that is expected to be great significant in the research and development of our prototype about wave energy conversion. 展开更多
关键词 hydraulic power take-off system (PTO) second transfers conversion efficiency hydraulic control
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Modeling and identification of HAGC system of temper rolling mill 被引量:5
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作者 贺尚红 钟掘 《Journal of Central South University of Technology》 EI 2005年第6期699-704,共6页
Including servo valve, hydraulic cylinder, mill and sensor and ignoring nonlinear factors, the linear dynamic model of hydraulic automatic gage control(HAGC) system of a temper rolling mill was theoretically derived. ... Including servo valve, hydraulic cylinder, mill and sensor and ignoring nonlinear factors, the linear dynamic model of hydraulic automatic gage control(HAGC) system of a temper rolling mill was theoretically derived. The order of the model is 4/4, and can be reduced to 2/2. Based on modulating functions method, utilizing numerical integration, we constructed the equivalent identification model of HAGC, and the least square estimation algorithm was established. The input and output data were acquired on line at temper rolling mill in Shangshai Baosteel Group Corporation, and the continuous time model of HAGC system was estimated with the proposed method. At different modulating window intervals, the estimated parameters changed remarkably. When the frequency bandwidth of modulating filter matches that of estimated system, the parameters can be estimated accurately. Finally, the dynamic model of the HAGC was obtained and validated based on the spectral analysis result. 展开更多
关键词 hydraulic automatic gage control MODELING IDENTIFICATION temper rolling mill
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Design and implementation of a nonlinear robust controller based on the disturbance observer for the active spray boom suspension
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作者 Longfei Cui Xinyu Xue +3 位作者 Wei Kong Suming Ding Wei Gu Feixiang Le 《International Journal of Agricultural and Biological Engineering》 SCIE CAS 2023年第1期153-161,共9页
Spray boom vibrations are one of the main causes of the uneven distribution of agrochemicals.Using active suspension to maintain the correct height of nozzles is critical for obtaining a uniform spray pattern and mini... Spray boom vibrations are one of the main causes of the uneven distribution of agrochemicals.Using active suspension to maintain the correct height of nozzles is critical for obtaining a uniform spray pattern and minimizing the possibility of spray drift.However,the electro-hydraulic active pendulum boom suspension has nonlinear uncertain factors such as parameter uncertainties,external disturbances,model error,etc.,which complicate the design of the controller.Therefore,this paper proposes a nonlinear robust feedback control method with disturbances compensation,which integrates a robust controller and disturbance observers through the backstepping method.Initially,to verify the performance of the controller,the Lyapunov stability theory is used to prove that the proposed controller can guarantee the given transient performance and the final tracking accuracy.Furthermore,taking the active suspension of a 28 m wide boom driven by a single-rod hydraulic actuator as an implementation case,the proposed NRCDC controller was compared with a variety of control schemes through a rapid control prototype of a pendulum active suspension.Finally,the proposed control scheme is implemented on a self-propelled sprayer with a boom of 12 m in length.The field test results show that all the performance indicators of the NRCDC controller are better than the other three conventional controllers.Both laboratory and field tests have verified the effectiveness and high performance of the proposed controller. 展开更多
关键词 robust control sprayer boom boom suspension hydraulic control system disturbance observer
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A practical nonlinear robust control approach of electro-hydraulic load simulator 被引量:10
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作者 Wang Chengwen Jiao Zongxia +1 位作者 Wu Shuai Shang Yaoxing 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第3期735-744,共10页
This paper studies a nonlinear robust control algorithm of the electro-hydraulic load simulator (EHLS). The tracking performance of the EHLS is mainly limited by the actuator's motion disturbance, flow nonlinearity... This paper studies a nonlinear robust control algorithm of the electro-hydraulic load simulator (EHLS). The tracking performance of the EHLS is mainly limited by the actuator's motion disturbance, flow nonlinearity, and friction, etc. The developed controller is developed based on the nonlinear motion loading model. The problems of the actuator's disturbance and flow nonlinearity are considered. To address the friction problem, the friction model of the loading motor is identified experimentally. The friction disturbance is compensated using the obtained friction model. Therefore, this paper considers the main three factors comprehensively. The developed algorithm is easy to apply since the controller can be obtained just with one step back-stepping design. The stability of the developed algorithm is proven via Lyapunov analysis. Both co-simulation and experiments are performed to verify the effectiveness of this method. 展开更多
关键词 CO-SIMULATION Electro-hydraulic load simulator hydraulic control equipment Nonlinear robust control Parametric uncertainty
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Optimization Based on Convergence Velocity and Reliability for Hydraulic Servo System 被引量:5
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作者 Muhammad Babar Nazir 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2009年第4期407-412,共6页
This article presents an optimal hybrid fuzzy proportion integral derivative (HFPID) controller based on combination of proportion integral derivative (PID) and fuzzy controllers, by which the parameters could be ... This article presents an optimal hybrid fuzzy proportion integral derivative (HFPID) controller based on combination of proportion integral derivative (PID) and fuzzy controllers, by which the parameters could be evaluated by global optimization either in convergence velocity or in convergence reliability. Focusing on the nonlinear factors of hydraulic servo system, this article takes advantage of PID and fuzzy logic controller integrated with scaling factors to acquire precise tracking performances. To further improve the performances, it provides new developed optimization with rapid convergence to attain reliable approach probability. Focusing on the performance indictors of evolutionary algorithm, this article presents a new technique to predict reliability of the optimization algorithm. Statistics authenticates the effectiveness and robustness of the optimization. Further, many simulation and experimental results indicate that the optimal HFPID could acquire perfect immunity against parametric uncertainties with external disturbance. 展开更多
关键词 adaptive control system novel evolutionary algorithm hydraulic control equipment convergence velocity convergencereliability OPTIMIZATION
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FOUR-PARAMETER AUTOMATIC TRANSMISSION TECHNOLOGY FOR CONSTRUCTION VEHICLE BASED ON ELMAN RECURSIVE NEURAL NETWORK 被引量:6
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作者 ZHANG Hongyan ZHAO Dingxuan +1 位作者 TANG Xinxing Ding Chunfeng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第1期20-24,共5页
From the viewpoint of energy saving and improving transmission efficiency, the ZL50E wheel loader is taken as the study object. And the system model is analyzed based on the transmission system of the construction veh... From the viewpoint of energy saving and improving transmission efficiency, the ZL50E wheel loader is taken as the study object. And the system model is analyzed based on the transmission system of the construction vehicle. A new four-parameter shift schedule is presented, which can keep the torque converter working in the high efficiency area. The control algorithm based on the Elman recursive neural network is applied, and four-parameter control system is developed which is based on industrial computer. The system is used to collect data accurately and control 4D180 power-shift gearbox of ZL50E wheel loader shift timely. An experiment is done on automatic transmission test-bed, and the result indicates that the control system could reliably and safely work and improve the efficiency of hydraulic torque converter. Four-parameter shift strategy that takes into account the power consuming of the working pump has important operating significance and reflects the actual working status of construction vehicle. 展开更多
关键词 Construction vehicle hydraulic transmission and control Automatic transmission Elman recursive neural network
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Design of a Hydraulic Control Unit for a Two-Speed Dedicated Electric Vehicle Transmission 被引量:4
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作者 Xiangyang Xu Wenbo Sun +2 位作者 Tianyuan Cai Yanfang Liu Xiao Han 《Automotive Innovation》 EI 2018年第4期300-310,共11页
Two-speed automatic transmission is one solution to increase the economic efficiency and dynamic performance of battery electric vehicles(BEV).Hydraulic control unit(HCU)is a key component in automatic transmissions,w... Two-speed automatic transmission is one solution to increase the economic efficiency and dynamic performance of battery electric vehicles(BEV).Hydraulic control unit(HCU)is a key component in automatic transmissions,which determines the quality of shifting directly.Based on the structural scheme and shift logic of a two-speed dedicated electric vehicles transmission(2DET)with two wet clutches,we designs a 2DET hydraulic control unit composed of three subsystems:pressure regulating and flow control system,shift operated and control system and cooling and lubrication system.The results of the experiments,including the valve body bench test,transmission bench test and vehicle test,show that the design of hydraulic control unit meets the requirements. 展开更多
关键词 Battery electric vehicle Automatic transmission hydraulic control unit Dynamic simulation
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Motion synchronization in a dual redundant HA/EHA system by using a hybrid integrated intelligent control design 被引量:4
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作者 Waheed Ur Rehman Wang Shaoping +2 位作者 Wang Xingjian Fan Lei Kamran Ali Shah 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2016年第3期789-798,共10页
This paper presents an integrated fuzzy controller design approach to synchronize a dis- similar redundant actuation system of a hydraulic actuator (HA) and an electro-hydrostatic actu- ator (EHA) with system unce... This paper presents an integrated fuzzy controller design approach to synchronize a dis- similar redundant actuation system of a hydraulic actuator (HA) and an electro-hydrostatic actu- ator (EHA) with system uncertainties and disturbances. The motion synchronous control system consists of a trajectory generator, an individual position controller for each actuator, and a fuzzy force tracking controller (FFTC) for both actuators. The trajectory generator provides the desired motion dynamics and designing parameters of the trajectory which are taken according to the dynamic characteristics of the EHA. The position controller consists of a feed-forward controller and a fuzzy position tracking controller (FPTC) and acts as a decoupled controller, improving posi- tion tracking performance with the help of the feed-forward controller and the FPTC. The FFTC acts as a coupled controller and takes into account the inherent coupling effect. The simulation results show that the proposed controller not only eliminates initial force fighting by synchronizing the two actuators, but also improves disturbance rejection performance. 展开更多
关键词 Dissimilar redundant:Electro-hydrostatic actuator Fuzzy controlhydraulic actuator Motion synchronization Redundant systems
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