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Control Strategies for Digital Twin Systems
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作者 Guo-Ping Liu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2024年第1期170-180,共11页
With the continuous breakthrough in information technology and its integration into practical applications, industrial digital twins are expected to accelerate their development in the near future. This paper studies ... With the continuous breakthrough in information technology and its integration into practical applications, industrial digital twins are expected to accelerate their development in the near future. This paper studies various control strategies for digital twin systems from the viewpoint of practical applications.To make full use of advantages of digital twins for control systems, an architecture of digital twin control systems, adaptive model tracking scheme, performance prediction scheme, performance retention scheme, and fault tolerant control scheme are proposed. Those schemes are detailed to deal with different issues on model tracking, performance prediction, performance retention, and fault tolerant control of digital twin systems. Also, the stability of digital twin control systems is analysed. The proposed schemes for digital twin control systems are illustrated by examples. 展开更多
关键词 digital twin control systems fault tolerant control model tracking performance prediction performance retention
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Digital Servo Control of a Robotic Excavator 被引量:4
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作者 GU Jun SEWARD Derek 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2009年第2期190-197,共8页
An electro-hydraulic control system is designed and implemented for a robotic excavator known as the Lancaster University Computerised and Intelligent Excavator (LUCIE). The excavator is being developed to autonomou... An electro-hydraulic control system is designed and implemented for a robotic excavator known as the Lancaster University Computerised and Intelligent Excavator (LUCIE). The excavator is being developed to autonomously dig trenches without human intervention. Since the behavior of the excavator arm is dominated by the nonlinear dynamics of the hydraulic actuators and by the large and unpredictable external disturbances when digging, it is difficult to provide adequate accurate, quick and smooth movement under traditional control methodology, e.g., PI/PID, which is comparable with that of an average human operator. The data-based dynamic models are developed utilizing the simplified refined instrumental variable (SRIV) identification algorithm to precisely describe the nonlinear dynamical behaviour of the electro-hydraulic actuation system. Based on data-based model and proportional-integral-plus (PIP) methodology, which is a non-minimal state space method of control system design based on the true digital control (TDC) system design philosophy, a novel control system is introduced to drive the excavator arm accurately, quickly and smoothly along the desired path. The performance of simulation and field tests which drive the bucket along straight lines both demonstrate the feasibility and validity of the proposed control scheme. 展开更多
关键词 robotic excavator nonlinear dynamics data-based model true digital control (TDC) proportional-integral-plus (PIP)
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Design and Implementation of Digital Fractional Order PID Controller Using Optimal Pole-Zero Approximation Method for Magnetic Levitation System 被引量:3
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作者 Amit S.Chopade Swapnil W.Khubalkar +2 位作者 A.S.Junghare M.V.Aware Shantanu Das 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2018年第5期977-989,共13页
The aim of this paper is to employ fractional order proportional integral derivative(FO-PID)controller and integer order PID controller to control the position of the levitated object in a magnetic levitation system(M... The aim of this paper is to employ fractional order proportional integral derivative(FO-PID)controller and integer order PID controller to control the position of the levitated object in a magnetic levitation system(MLS),which is inherently nonlinear and unstable system.The proposal is to deploy discrete optimal pole-zero approximation method for realization of digital fractional order controller.An approach of phase shaping by slope cancellation of asymptotic phase plots for zeros and poles within given bandwidth is explored.The controller parameters are tuned using dynamic particle swarm optimization(d PSO)technique.Effectiveness of the proposed control scheme is verified by simulation and experimental results.The performance of realized digital FO-PID controller has been compared with that of the integer order PID controllers.It is observed that effort required in fractional order control is smaller as compared with its integer counterpart for obtaining the same system performance. 展开更多
关键词 Approximation methods digital control dis-cretization fractional calculus fractional order PID controller(FO-PID) magnetic levitation particle swarm optimization(PSO) position control.
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Solar Energy System with Digital Controller for Grid Connected Systems 被引量:1
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作者 Abhijit V.Padgavhankar Sharad W.Mohod 《Journal of Electronic Science and Technology》 CAS 2014年第3期277-282,共6页
--The solar photovoltaic (PV) module output voltage changes according to the variation of light intensity and temperature. This paper presents the implementation of an automatic digital controller of a DC-DC boost c... --The solar photovoltaic (PV) module output voltage changes according to the variation of light intensity and temperature. This paper presents the implementation of an automatic digital controller of a DC-DC boost converter without batteries for a solar cell module by using a peripheral interface controller, which forms a closed loop, to control the ON-OFF period of the switching pulse. The output of DC-DC converter is maintained by automatically increasing or decreasing the pulse width. To produce the pulse width modulation (PWM), the microcontroller is programmed according to the required duty cycle for the power switch. The PWM ON period is increased with the decrease in the PV voltage and vice-versa. The input voltage to the inverter is maintained constantly and is converted into an AC signal by using the metal-oxide-semiconductor field effect transistor (MOSFET) H-bridge operated in the sinusoidal pulse width modulation mode by using a PIC (peripheral interface controller) microcontroller. The generated AC signal can be connected to the AC grid or to the AC load. The simulated results by using Proteus 8 and hardware implemented results verify the effectiveness of the proposed controller. 展开更多
关键词 Boost converter digital controller INVERTER renewable energy solar energy
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Kolmogorov-Chaitin Complexity of Digital Controller Implementations 被引量:1
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作者 James F. Whidborne John McKernan Da-Wei Gu 《International Journal of Automation and computing》 EI 2006年第3期314-322,共9页
The complexity of linear, fixed-point arithmetic digital controllers is investigated from a Kolmogorov-Chaitin perspective. Based on the idea of Kolmogorov-Chaitin complexity, practical measures of complexity are deve... The complexity of linear, fixed-point arithmetic digital controllers is investigated from a Kolmogorov-Chaitin perspective. Based on the idea of Kolmogorov-Chaitin complexity, practical measures of complexity are developed for statespace realizations, parallel and cascade realizations, and for a newly proposed generalized implicit state-space realization. The complexity of solutions to a restricted complexity controller benchmark problem is investigated using this measure. The results show that from a Kolmogorov-Chaitin viewpoint, higher-order controllers with a shorter word-length may have lower complexity and better performance, than lower-order controllers with longer word-length. 展开更多
关键词 controller complexity finite-precision arithmetic finite word length digital controller Kolmogorov-Chaitin complexity.
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Digital control of pulsed gas metal arc welding inverter using TMS320LF2407A 被引量:1
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作者 吴开源 黄石生 +1 位作者 李星林 吴水锋 《China Welding》 EI CAS 2008年第1期75-80,共6页
A digital control of pulsed gas metal arc welding inverter was proposed. A control system consisting of analogue parts was replaced with a new digital control implemented in a TMS320LF2407A DSP chip. The design and co... A digital control of pulsed gas metal arc welding inverter was proposed. A control system consisting of analogue parts was replaced with a new digital control implemented in a TMS320LF2407A DSP chip. The design and constructional features of the whole digital control were presented. The resources of the DSP chip were efficiently utilized and the circuits are very concise, which can enhance the stability and reliability of welding inverter. Experimental results demonstrate that the developed digital control has the ability to accomplish the excellent pulsed gas metal arc welding process and the merits of the developed digital control are stable welding process, little spatter and perfect weld appearance. 展开更多
关键词 pulsed gas metal arc welding inverter digital control digital signal processor TMS320LF2407A
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Finite-time Feedback Stabilization of a Class of Input-delay Systems With Saturating Actuators via Digital Control 被引量:2
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作者 Xiangze Lin Shuaiting Huang +1 位作者 Wanli Zhang Shihua Li 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2019年第5期1281-1290,共10页
In this paper, the problem of making an input-delay system with saturating actuators finite-time stable by virtue of digital control is investigated. A digital state feedback controller and digital observer-controller... In this paper, the problem of making an input-delay system with saturating actuators finite-time stable by virtue of digital control is investigated. A digital state feedback controller and digital observer-controller compensator are designed for two cases: when the state of the input-delay system are available or when it is unavailable. Sufficient conditions which guarantee finite-time stability of a closed-loop input-delay system are given and the proof procedure is presented in a heuristic way by constructing appropriate comparison functions. The condition can be transformed into the intersection of two curves satisfying some constraints, which reveals the relationship between designed parameters clearly. Finally, simulation results are presented to validate the method proposed in this paper. 展开更多
关键词 digital control FINITE-TIME STABILITY input-delay system saturating ACTUATOR
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Design and Experimental Evaluation of PID Controller for Digital Electro-Pneumatic Cabin Pressure Control System 被引量:3
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作者 Nie Jinfang Pan Quan +2 位作者 Shen Hao Song Zhitao Zhang Dalin 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2016年第5期576-583,共8页
The performance of the designed digital electro-pneumatic cabin pressure control system for the cabin pressure schedule of transport aircraft is investigated.For the purpose of this study,an experimental setup consist... The performance of the designed digital electro-pneumatic cabin pressure control system for the cabin pressure schedule of transport aircraft is investigated.For the purpose of this study,an experimental setup consisting of a simulated hermetic cabin and altitude simulation chamber is configured for cabin pressure control system operation.A series of experimental tests are executed to evaluate the performance of the cabin pressure control system.The parameters of the PID controller are optimized.In the optimization process,the variation regularity of the rate of cabin pressure change under various conditions is considered.An approach to prioritize the control of the rate of change of cabin pressure based on the flight status model is proposed and verified experimentally.The experimental results indicate that the proposed approach can be adopted for the designed digital electro-pneumatic cabin pressure control system to obtain a better cabin pressure schedule and rate of cabin pressure change. 展开更多
关键词 CABIN pressure control digital electro-pneumatic PID controller
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Development of Digital-Controlled Measuring Instrument for Hearing 被引量:3
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作者 Longcong Chen Gaiqin Liu +2 位作者 Bin Gao Ping Chen Xingliang Xiong 《Journal of Signal and Information Processing》 2012年第4期421-426,共6页
A digital-controlled measuring instrument for hearing, which is mainly composed of STC11F16EX, AD9833, ISD400416MS and LM1972, is introduced in this paper. It may output highly accurate and purified sine signal whose ... A digital-controlled measuring instrument for hearing, which is mainly composed of STC11F16EX, AD9833, ISD400416MS and LM1972, is introduced in this paper. It may output highly accurate and purified sine signal whose frequency and amplitude are controlled by digital data. Specially, the displaying number of decibel is equal to actual number of decibel because that frequency response of earphone is corrected through software of microcontroller. Additionally, touching buttons, which is simple and convenience to use, is selected. Hence this instrument is convenient to measure and teach about hearing specially, research and study on frequency characteristic of human ear and impedance characteristic of human body in medical science. 展开更多
关键词 STC11F16EX digital-controlled HEARING AD9833
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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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Application study of digital PID controller in cockpit temperature auto-regulating system 被引量:1
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作者 周坦胜 董建军 宋宗权 《Journal of Measurement Science and Instrumentation》 CAS 2013年第2期190-193,共4页
Aiming at the inherent blemish existi ng currently in airplane cockpit temperature regulating system,a digital temperatu re auto-regulating design scheme of the system is put forward,namely,a digita l proportional-int... Aiming at the inherent blemish existi ng currently in airplane cockpit temperature regulating system,a digital temperatu re auto-regulating design scheme of the system is put forward,namely,a digita l proportional-integral-derivative(PID) controller used for temperature contr ol is designed.And then it is applied in airpl ane cockpit temperature regulating system by adopting the way of cascade control.Experiment results indicate that the design scheme is reasonable and practical. 展开更多
关键词 inherent blemish digital proportional-integral-derivative (PID) controller cascade control auto-regulating
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Simple Push-Type Wave Generating Method Using Digital Rotary Valve Control 被引量:6
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作者 Yi Liu Jiafei Zheng +3 位作者 Ruiyin Song Qiaoning Xu Junhua Chen Fangping Huang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2020年第1期221-231,共11页
The important parameters to describe waves are their amplitude and length.In order to make it easier to improve wave amplitude and facilitate wave experiment,a simple push-type wave generating method using digital rot... The important parameters to describe waves are their amplitude and length.In order to make it easier to improve wave amplitude and facilitate wave experiment,a simple push-type wave generating method using digital rotary valve control was proposed and different wave amplitudes were generated by the new method.After the mathematical model of the new method had been established,numerical analysis based on the linear wave theory was carried out by means of Matlab/Simulink software tools,and experiments were conducted on the push-type wave maker to ascertain the validity of the established model and the numerical simulation results.It shows that both experimental and theoretical results agree relatively well,and the plate motion frequency and amplitude of the push-type wave maker can be continuously adjusted and the various required regular waves can be obtained.Although the wave amplitude and length descends with the increasing of working frequency,the wave amplitude can be improved conveniently by setting the axial opening width of the valve and the oil supply pressure of system.The wave length remains unchanged with the axial opening width and the oil supply pressure change.The research indicates that different regular waves can be easily generated by the new method and the wave amplitude can be further improved in a certain plate motion frequency range. 展开更多
关键词 Push-type WAVE MAKER digitAL rotary valve control Mathematical modeling WAVE amplitude WAVE frequency
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Frequency Control System with Digital Signal Processing Techniques 被引量:1
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作者 Iku Hirano Jun Ishikawa 《Journal of Energy and Power Engineering》 2012年第2期304-308,共5页
The frequency of digitally controlled iodine stabilized He-Ne laser locked to a hyperfine component in ^127I2 was measured using the National Metrology Institute of Japan's reference iodine stabilized He-Ne laser. Th... The frequency of digitally controlled iodine stabilized He-Ne laser locked to a hyperfine component in ^127I2 was measured using the National Metrology Institute of Japan's reference iodine stabilized He-Ne laser. This laser is operated under the conditions of the practical implementation and its frequency with respect to the International Committee for Weights and Measure recommended value is known from international comparisons. Adopting a sampling rate of 120 kHz for the control system of an iodine stabilized He-Ne laser enables frequency deviation of the test laser from the reference laser by + 5 kHz (relative accuracy of 1 ×10^11) thus limited only by the reproducibility of the iodine stabilized He-Ne laser itself. 展开更多
关键词 FREQUENCY iodine stabilized He-Ne laser hyperfine component the third harmonic digital control system.
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A digital controlled alternating electromagnetic stirring generator based on dual inverter structure
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作者 张芩 谢芳祥 +2 位作者 朱磊 叶惠 王振民 《China Welding》 EI CAS 2015年第4期74-80,共7页
A digital controlled alternating electromagnetic stirring generator is proposed in this paper. The main circuit of the generator makes use of dual inverter structure among which the former inverter uses full bridge ze... A digital controlled alternating electromagnetic stirring generator is proposed in this paper. The main circuit of the generator makes use of dual inverter structure among which the former inverter uses full bridge zero voltage switching topology and the latter inverter uses full bridge inverter circuit. To improve the dynamic response performance, the inverting frequency of the former inverter is as high us 100 kHz. The Cortex-M3 kernel based ARM microcontroller LM3S818 is adopted as the cybernetics core of the digital control system to achieve accurate, stable and flexible control of the generator. All the PWM signals for the former and latter inverters are generated by the LM3S818 directly. The constant current characteristic of the former inverter is obtained through current close-loop feedback control, and can ensure the operation safety when the output current waveform is at zero crossing point. Both simulation and experiment results show that the proposed generator is with such advantages as wide soft-switching range, perfect control accuracy and flexible waveform modulation, and can fulfill the requirements of electromagnetic stirring process. 展开更多
关键词 electromagnetic stirring generator dual inverter digital control SOFT-SWITCHING ARM
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Design of low-power high-frequency digital controlled DC-DC switching power converter
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作者 高艳霞 郭水保 《Journal of Shanghai University(English Edition)》 CAS 2008年第5期450-456,共7页
This paper models a low-power high-frequency digitally controlled synchronous rectifier (SR) OUCK converter. The converter is a hybrid system with three operation modes. Digital PID controler is used. Key problems s... This paper models a low-power high-frequency digitally controlled synchronous rectifier (SR) OUCK converter. The converter is a hybrid system with three operation modes. Digital PID controler is used. Key problems such as quantization resolution of digital pulse-width modulation (DPWM) and steady-state limit cycles of digital control switching model power supply (SMPS) are discussed, with corresponding solutions presented. Simulation of a digital control synchronous buck is performed with a fixed-point algorithm. The results show that the described approach enables high-speed dynamic performance. 展开更多
关键词 digital control digital pulse-width modulation (DPWM) limit cycle buck converter
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Software Development for Digital Control of WDW Series Testing Machine and Measurement of K_(IC)
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作者 黄兴 马杭 程昌钧 《Journal of Shanghai University(English Edition)》 CAS 2005年第1期58-61,共4页
Software has been developed for digital control of WDW series testing machine and the measurement of fracture toughness by modularized design. Development of the software makes use of multi-thread and serial communica... Software has been developed for digital control of WDW series testing machine and the measurement of fracture toughness by modularized design. Development of the software makes use of multi-thread and serial communication techniques, which can accurately control the testing machine and measure the fracture toughness in real-time. Three-point bending specimens were used in the measurement. The software operates stably and reliably, expanding the function of WDW series testing machine. 展开更多
关键词 testing machine digital control measurement of fracture toughness software development.
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THE FEEDBACK DELAY IN DIGITAL CONTROL
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作者 刘宜 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 1993年第2期211-217,共7页
It is a fact that the feedback delay actually arises in digital control systems. It is necessary to modify the structure of digital control systems and develop new control algorithms, which is done in this paper. A gr... It is a fact that the feedback delay actually arises in digital control systems. It is necessary to modify the structure of digital control systems and develop new control algorithms, which is done in this paper. A great number of digital computer simulation experiments have shown the obvious advantage of the new algorithms. 展开更多
关键词 Feedback Delay digital control System control Algorithm.
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Digital close loop control system for current-programmed mode arc welding inverter
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作者 李阳 黄石生 +1 位作者 陆沛涛 石永华 《China Welding》 EI CAS 2013年第2期76-82,共7页
A small-signal model of current programmed mode pulse width modulation converter including the equivalent sampling effect is introduced and analyzed. In this model, an addition pole is brought out by the sampling effe... A small-signal model of current programmed mode pulse width modulation converter including the equivalent sampling effect is introduced and analyzed. In this model, an addition pole is brought out by the sampling effect in the current loop gain, and it affects dynamic bandwidth and stability of the inner current loop. By selecting the appropriate stability parameter which determines the additional pole and describes the degree of peaking in closed loop transfer function, a control model of current programmed full bridge arc welding inverter with maximum frequency bandwidth and stability can be obtained. Small and large amplitude pulse current outputs are employed in simulations and experiments and results validate the design method. 展开更多
关键词 current-programmed mode pulse width modulation digital control slope compensation arc welding inverter
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Digital control system for pulsed MIG welding power based on STM32
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作者 吴开源 章涛 +2 位作者 何祖伟 李华佳 程佳 《China Welding》 EI CAS 2015年第2期75-80,共6页
Digital control system for pulsed MIG welding power based on STM32 is set up with 32-bit STM32FlO3ZET6 directing against the pulse waveform modulation of pulsed MIG welding. High-frequency inverter and medium-low freq... Digital control system for pulsed MIG welding power based on STM32 is set up with 32-bit STM32FlO3ZET6 directing against the pulse waveform modulation of pulsed MIG welding. High-frequency inverter and medium-low frequency pulse waveform modulation of pulsed MIG welding are realized by using the integrated PWM module within STM32 to generate PWM signals of phase-shifted full-bridge soft-switching and constant-current control of output current is achieved by means of anti-windup PI control algorithm to improve the stability and reliability of control system. Experimental results demonstrate that the designed digital control system based on STM32 can achieve pegrect pulsed MIG welding technique with stable welding process and good weld appearance, fully demonstrating the advantages of digital control based on STM32. 展开更多
关键词 pulsed MIG welding digital control STM32 phase-shifted full-bridge soft-switching
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Study of modeling and simulation of full digital controlled PMIG/MAG welding system based on Matlab/Simulink
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作者 王伟明 刘嘉 +2 位作者 苏建中 殷树言 马德 《China Welding》 EI CAS 2004年第1期31-35,共5页
This paper presents an integrated simulation model for full digital controlled PMIG/MAG welding system with Matlab/Simulink, and it consists of power inverter, digital control system and dynamic arc-load model. An int... This paper presents an integrated simulation model for full digital controlled PMIG/MAG welding system with Matlab/Simulink, and it consists of power inverter, digital control system and dynamic arc-load model. An integrated simulation study was done for full digital PMIG/MAG welding, and a method of connecting dynamic arc-load model to the system with controlled current source was presented, in addition, the simulation results were utilized to study the issues of digital control PMIG/MAG welding in this paper. The experimental results validated the developed simulation model, and this simulation study can be applied in implementation of the full digital PMIG/MAG welding and analysis of system dynamic process. 展开更多
关键词 PMIG/MAG welding full digital control system(DSP) SIMULINK dynamic arc-load model 2-PI regulator
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