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Journal articles on the topic 'Delay compensator'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Wang, Hui Yu, Yong Zhang, and Jian Zhang. "Study on Real-Time Control of Power System Stability." Applied Mechanics and Materials 511-512 (February 2014): 1137–40. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.1137.

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This paper presents the design method Delays affect static var compensator WAN additional damping controller, containing static var compensator new power system, for example, through a controlled modal analysis to select Static Analysis conventional additional damping drawing's power compensator WAN input signal is calculated using the residue method to get its parameters, and then analyzed using delay-dependent stability criterion of conventional reactive power compensator damping controller contains additional stationary Delay power system stability, finalized the SVC gain additional damping controller based on delay stability analysis, the results show Delay Considered static var compensator additional damping controller not only can improve the damping characteristics of the system, but also has a certain time lag robustness.

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2

Li, Ge, Gang Shen, Zhen-Cai Zhu, Xiang Li, and Wan-Shun Zang. "Sine phase compensation combining an amplitude phase controller and a discrete feed-forward compensator for electro-hydraulic shaking tables." Transactions of the Institute of Measurement and Control 40, no. 11 (September 5, 2017): 3377–89. http://dx.doi.org/10.1177/0142331217723702.

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This article presents a novel control strategy on an electro-hydraulic shaking table under the acceleration control combining an amplitude phase controller and a zero phase error tracking controller with a discrete feed-forward compensator. Because of the electro-hydraulic system’s nonlinearity, phase delay and amplitude attenuation exist in the acceleration response signal inevitably when the electro-hydraulic shaking table system is excited by a sine vibration signal. Moreover, the phase delay of the electro-hydraulic shaking table is composed of phase deviation and actuator delay. For improving the acceleration tracking accuracy, an amplitude phase controller is employed to compensate the phase deviation and amplitude attenuation by introducing weights to adjust the reference signal. Meanwhile, the discrete feed-forward compensator is applied to compensate the actuator delay. As an offline compensator, the zero phase error tracking controller is employed to compensate the phase delay of the response signal and improve the convergence speed of the proposed controller. Overall, the proposed control strategy combines the merits of these three controllers with better tracking performance demonstrated by simulation and experimental results.

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3

Wang, Yaoyao, Bai Chen, and Hongtao Wu. "Practical continuous fractional-order nonsingular terminal sliding mode control of underwater hydraulic manipulators with valve deadband compensators." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 232, no. 4 (February 1, 2018): 459–69. http://dx.doi.org/10.1177/1475090217753900.

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For the multi-degrees of freedom control problem of underwater hydraulic manipulators with non-ignorable valve deadband and strong lumped nonlinearities and uncertainties, a practical continuous fractional-order nonsingular terminal sliding mode control design together with a deadband compensator is presented and studied. The presented method contains three parts a time delay estimation utilized to nearly estimate and compensate the extremely complicated system dynamics, a continuous fractional-order nonsingular terminal sliding mode used to ensure high control performance against the strong lumped nonlinearities and uncertainties, and a valve deadband compensator used to compensate for the non-ignorable valve deadband. The proposed method is model-free thanks to the time delay estimation, and can ensure satisfactory control performance thanks to the continuous fractional-order nonsingular terminal sliding mode and deadband compensator. Stability of the closed-loop control system including the deadband compensator is proved rigorously. Finally, practical 2-degrees of freedom experiments are performed, and corresponding results effectively demonstrate the superiorities of the newly presented controller with deadband compensator.

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4

Li, Zhenyu, Bin Wang, Haitao Yang, and Hong Liu. "Rapid satellite capture by a space robot based on delay compensation." Industrial Robot: An International Journal 44, no. 3 (May 15, 2017): 363–76. http://dx.doi.org/10.1108/ir-07-2016-0193.

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Purpose Rapid satellite capture by a free-floating space robot is a challenge problem because of no-fixed base and time-delay issues. This paper aims to present a modified target capturing control scheme for improving the control performance. Design/methodology/approach For handling such control problem including time delay, the modified scheme is achieved by adding a delay calibration algorithm into the visual servoing loop. To identify end-effector motions in real time, a motion predictor is developed by partly linearizing the space robot kinematics equation. By this approach, only ground-fixed robot kinematics are involved in the predicting computation excluding the complex space robot kinematics calculations. With the newly developed predictor, a delay compensator is designed to take error control into account. For determining the compensation parameters, the asymptotic stability condition of the proposed compensation algorithm is also presented. Findings The proposed method is conducted by a credible three-dimensional ground experimental system, and the experimental results illustrate the effectiveness of the proposed method. Practical implications Because the delayed camera signals are compensated with only ground-fixed robot kinematics, this proposed satellite capturing scheme is particularly suitable for commercial on-orbit services with cheaper on-board computers. Originality/value This paper is original as an attempt trying to compensate the time delay by taking both space robot motion predictions and compensation error control into consideration and is valuable for rapid and accurate satellite capture tasks.

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5

Agamennoni, O. E., A. C. Desages, and J. A. Romagnoli. "A multivariable delay compensator scheme." Chemical Engineering Science 47, no. 5 (April 1992): 1173–85. http://dx.doi.org/10.1016/0009-2509(92)80239-9.

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6

Wang, Wen, Fuming Han, Zhanfeng Chen, Ruijin Wang, Chuanyong Wang, Keqing Lu, Jiahui Wang, and Bingfeng Ju. "Modeling and Compensation for Asymmetrical and Dynamic Hysteresis of Piezoelectric Actuators Using a Dynamic Delay Prandtl–Ishlinskii Model." Micromachines 12, no. 1 (January 16, 2021): 92. http://dx.doi.org/10.3390/mi12010092.

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Piezoelectric actuators are widely used in micro- and nano-manufacturing and precision machining due to their superior performance. However, there are complex hysteresis nonlinear phenomena in piezoelectric actuators. In particular, the inherent hysteresis can be affected by the input frequency, and it sometimes exhibits asymmetrical characteristic. The existing dynamic hysteresis model is inaccurate in describing hysteresis of piezoelectric actuators at high frequency. In this paper, a Dynamic Delay Prandtl–Ishlinskii (DDPI) model is proposed to describe the asymmetrical and dynamic characteristics of piezoelectric actuators. First, the shape of the Delay Play operator is discussed under two delay coefficients. Then, the accuracy of the DDPI model is verified by experiments. Next, to compensate the asymmetrical and dynamic hysteresis, the compensator is designed based on the Inverse Dynamic Delay Prandtl–Ishlinskii (IDDPI) model. The effectiveness of the inverse compensator was verified by experiments. The results show that the DDPI model can accurately describe the asymmetrical and dynamic hysteresis, and the compensator can effectively suppress the hysteresis of the piezoelectric actuator. This research will be beneficial to extend the application of piezoelectric actuators.

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7

Prasanna, Velpula Lakshmi. "Controlling the Mitigating Impacts of Communication Delay on Load Frequency Control with an Adaptive Method." International Journal for Research in Applied Science and Engineering Technology 9, no. 11 (November 30, 2021): 1521–36. http://dx.doi.org/10.22214/ijraset.2021.39052.

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Abstract: Load Frequency Control is one of the most essential frequency management technologies in modern power systems (LFC). When employing LFC over a vast region, communication latency is unavoidable. A delay might not only affect system performance but also cause system instability. An alternate design strategy for constructing delay compensators for LFC in one or more control areas utilising an AFPI controller and ANFIS is proposed in this paper. For one-area LFC, a sufficient and required condition for designing a delay compensator is described. It is demonstrated that for multi-area LFC with Area Control Errors (ACEs), each control area can have its own delay controller designed as if it were a one-area system if the index of coupling among the areas is less than the small gain theorem's threshold value. The effectiveness of the proposed technique is validated by simulation experiments on LFCs with communication delays in one and multiple interconnected areas with and without time variable delays.

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8

Xia, Qiu, Long Chen, Xing Xu, Yingfeng Cai, Haobin Jiang, and Guangxiang Pan. "Expected yaw rate–based trajectory tracking control with vision delay for intelligent vehicle." Science Progress 103, no. 3 (July 2020): 003685042093427. http://dx.doi.org/10.1177/0036850420934274.

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Accurate and real-time position of preview point is significant to trajectory tracking control of vision-guided intelligent vehicle. The unavoidable delay of road automatic identification system weakens trajectory tracking control performance, and even deteriorates the vehicle stability. Therefore, a compensator for the delay of road automatic identification system was proposed which combines the current statistical model and adaptive Kalman predictor to estimate the state of preview point position. The trajectory tracking sliding mode controller of intelligent vehicle is established through a 2–degrees of freedom vehicle dynamic model and motion model by using MATLAB/Simulink and CarSim. The trajectory tracking performance under 20–100 ms delay is analyzed. The simulation results show that the trajectory tracking performance of intelligent vehicle will be affected by the delay of road automatic identification system, reducing tracking accuracy. And when the delay is too large, it will deteriorate the vehicle stability and safety. In addition, the simulation results also verify the effectiveness of current statistical–adaptive Kalman predictor compensator at different delays.

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9

Wójcik, Waldemar, Piotr Kisała, Gulbahar Yussupova, Nazym Kussambayeva, Gulzhan Kashaganova, and Damian Harasim. "Analysis of the Possibilities for Using a Uniform Bragg Grating in a Tunable Dispersion Compensator." International Journal of Electronics and Telecommunications 61, no. 4 (December 1, 2015): 381–87. http://dx.doi.org/10.2478/eletel-2015-0050.

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Abstract The article presents a tunable fibre optic dispersion compensator system, consisting of a specially designed cantilever beam and a uniform Bragg grating. It analyses the group delay and dispersion characteristics in the case that there is no apodization of the grating and also for a grating with apodization used for modulation of the refractive index. Various apodization parameters were tested, along with their effects on the dispersion characteristics of the entire system properties. It is demonstrated in the paper that the apodization parameter affects the compensator’s group delay characteristic. The finite elements method was used to design a compensator of such a shape that enabled chirp to be induced in a grating of a specified shape. A new design is presented for the system, in which the dispersion properties are tuned by the maximum value of the heterogeneous deformation of the compensator. The paper also includes results showing the effect of the maximum value of heterogeneous stress of the grating on the dispersion characteristics of the proposed construction.

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10

Murakami, Iwanori, Nghia Thi Mai, Kou Yamada, Takaaki Hagiwara, Yoshinori Ando, and Hideharu Yamamoto. "A Design Method for Modified Smith Predictors for Non-Minimum-Phase Time-Delay Plants with Multiple Feedback-Connected Time-Delays." Applied Mechanics and Materials 36 (October 2010): 253–62. http://dx.doi.org/10.4028/www.scientific.net/amm.36.253.

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In this paper, we examine a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays. The Smith predictor is proposed by Smith to overcome time-delay and known as an effective time-delay compensator for a plant with large time-delay. The Smith predictor by Smith cannot be used for plants having an integral mode, because a step disturbance will result in a steady state error. Several papers considered the problem to design modified Smith predictors for unstable plants. However, no paper examines a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays. In this paper, we examine a design method for modified Smith predictors for non-minimum-phase time-delay plants with multiple feedback-connected time-delays.

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11

Saito, Eiichi, and Seiichiro Katsura. "Compensation of Integrated Resonant and Time Delay System by Using Wave Compensator." Automatika 54, no. 1 (January 2013): 28–38. http://dx.doi.org/10.7305/automatika.54-1.322.

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12

Fite and, Kevin B., Michael Goldfarb, and Angel Rubio. "Loop Shaping for Transparency and Stability Robustness in Time-Delayed Bilateral Telemanipulation." Journal of Dynamic Systems, Measurement, and Control 126, no. 3 (September 1, 2004): 650–56. http://dx.doi.org/10.1115/1.1790539.

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This paper presents a control methodology that provides transparency and stability robustness in bilateral telemanipulation systems that include a significant time delay in the communication channels. The method utilizes an adaptive Smith predictor to compensate for the time delay, and incorporates a previously published loop shaping approach to design a compensator for transparency and stability robustness of the loop. The method is experimentally demonstrated on a single degree-of-freedom telemanipulation system, and is shown to effectively provide stability and performance robustness.

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13

Wang, Xiuqin, Rui Zhang, Guoli Li, Qunjing Wang, and Yan Wen. "Time Delay Estimation Control of Permanent Magnet Spherical Actuator Based on Gradient Compensation." Electronics 11, no. 1 (December 26, 2021): 66. http://dx.doi.org/10.3390/electronics11010066.

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A multi-degree-of-freedom Permanent Magnet Spherical Actuator (PMSpA) has a special mechanical structure and electromagnetic fields, and is easily affected by nonlinear disturbances such as modeling errors and friction. Therefore, the quality of a PMSpA control system may be deteriorated. In order to keep the PMSpA with good trajectory tracking performance, this paper designs a time delay estimation controller based on gradient compensation. Firstly, the dynamic model of the PMSpA with nonlinear terms is derived. The nonlinear terms in the complex dynamic model can be simplified and estimated by the time delay estimation method. Secondly, for the estimation errors caused by time delay control, a gradient compensator is introduced to further correct and compensate for it. Furthermore, the stability of the designed controller is proved by the Lyapunov equation. Finally, the correctness and effectiveness of the controller are validated by comparison with other controllers through simulation. In addition, experimental results have also shown that the control accuracy of the spherical motor can be effectively improved using the proposed controller.

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14

Rao, A. Seshagiri, and M. Chidambaram. "Smith delay compensator for multivariable non-square systems with multiple time delays." Computers & Chemical Engineering 30, no. 8 (June 2006): 1243–55. http://dx.doi.org/10.1016/j.compchemeng.2006.02.017.

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15

Mai, Nghia Thi, Kou Yamada, Yoshinori Ando, Iwanori Murakami, and Tatsuya Hoshikawa. "A Design Method for Two-Degree-of-Freedom Modified Smith Predictors for Multiple-Input/Multiple-Output Time-Delay Plants." Key Engineering Materials 497 (December 2011): 221–33. http://dx.doi.org/10.4028/www.scientific.net/kem.497.221.

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The modified Smith predictor is well known as an effective time-delay compensator fora plant with large time-delays, and several papers on the modified Smith predictor have been published.Recently, the parameterization of all stabilizing modified Smith predictors for time-delay plantswas obtained by Yamada et al. But, their method cannot specify the input-output characteristic andthe feedback characteristic separately. From the practical point of view, it is desirable that the inputoutputcharacteristic and the feedback characteristic are specified separately. In this paper, we proposethe parameterization of all stabilizing two-degree-of-freedom modified Smith predictors for multipleinput/multiple-output time-delay plants.

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16

FUJITA, Masayoshi, and Katsuhisa OHBA. "204 Improvement of Delay Compensator for Thermo-Anemometer." Proceedings of Conference of Tokai Branch 2010.59 (2010): 79–80. http://dx.doi.org/10.1299/jsmetokai.2010.59.79.

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17

Albertos, P., P. García, Q. Chen, and X. Luan. "Dead-Time Compensator for State-delay Stable Systems." IFAC-PapersOnLine 51, no. 18 (2018): 672–77. http://dx.doi.org/10.1016/j.ifacol.2018.09.346.

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18

Cheung, Yushing, Jae H. Chung, and Daehie Hong. "Adaptive force reflecting teleoperation with local force compensators." Robotica 25, no. 4 (February 14, 2007): 433–44. http://dx.doi.org/10.1017/s0263574706003225.

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SUMMARYThis paper addresses problems to achieve transparency and contact stability for teleoperation that consists of unconstrained and constrained motions. The adaptive bilateral control with a local force compensator is developed, based on adaptive impedance control and contact force driven compensation with auto-switching functions. Without any knowledge about robotic and environment dynamics and with a communication delay, the developed method guarantees good adaptive tracking performance in unconstrained motion and reduction of oscillating contacts in constrained motion. Based on an actual haptic device and a virtual manipulator, haptic simulations are presented to demonstrate adaptive transparency and contact stability in the presence of communication delay.

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19

Lei, Jing, Xin Wang, Yu-Mei She, and Tian-Jun Zhang. "Variable Structure Disturbance Rejection Control for Nonlinear Uncertain Systems with State and Control Delays via Optimal Sliding Mode Surface Approach." Abstract and Applied Analysis 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/141058.

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The paper considers the problem of variable structure control for nonlinear systems with uncertainty and time delays under persistent disturbance by using the optimal sliding mode surface approach. Through functional transformation, the original time-delay system is transformed into a delay-free one. The approximating sequence method is applied to solve the nonlinear optimal sliding mode surface problem which is reduced to a linear two-point boundary value problem of approximating sequences. The optimal sliding mode surface is obtained from the convergent solutions by solving a Riccati equation, a Sylvester equation, and the state and adjoint vector differential equations of approximating sequences. Then, the variable structure disturbance rejection control is presented by adopting an exponential trending law, where the state and control memory terms are designed to compensate the state and control delays, a feedforward control term is designed to reject the disturbance, and an adjoint compensator is designed to compensate the effects generated by the nonlinearity and the uncertainty. Furthermore, an observer is constructed to make the feedforward term physically realizable, and thus the dynamical observer-based dynamical variable structure disturbance rejection control law is produced. Finally, simulations are demonstrated to verify the effectiveness of the presented controller and the simplicity of the proposed approach.

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20

Yoo, Sung Jin. "Adaptive State-Quantized Control of Uncertain Lower-Triangular Nonlinear Systems with Input Delay." Mathematics 9, no. 7 (April 1, 2021): 763. http://dx.doi.org/10.3390/math9070763.

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In this paper, we investigate the adaptive state-quantized control problem of uncertain lower-triangular systems with input delay. It is assumed that all state variables are quantized for the feedback control design. The error transformation method using an auxiliary time-varying signal is presented to deal with the compensation problem of input delay. Based on the error surfaces with the auxiliary variable, a neural-network-based adaptive state-quantized control scheme is constructed with the design of the input delay compensator. Different from existing results in the literature, the proposed method exhibits the following features: (i) compensating for the input delay effect by using quantized states; and (ii) establishing the stability of the adaptive quantized feedback control system in the presence of input delay. Furthermore, the boundedness of all the signals in the closed-loop and the convergence of the tracking error are analyzed. The effectiveness of the developed control strategy is demonstrated through the simulation on a hydraulic servo system.

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21

Hussain, Muntazir, and Muhammad Rehan. "Nonlinear time-delay anti-windup compensator synthesis for nonlinear time-delay systems: A delay-range-dependent approach." Neurocomputing 186 (April 2016): 54–65. http://dx.doi.org/10.1016/j.neucom.2015.12.078.

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22

Saffer, Daniel R., Jorge J. Castro, and Francis J. Doyle. "A variable time delay compensator for multivariable linear processes." Journal of Process Control 15, no. 2 (March 2005): 215–22. http://dx.doi.org/10.1016/j.jprocont.2004.05.005.

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23

Lamrabet, Ouarda, El Houssaine Tissir, and Fatima El Haoussi. "Anti-windup Compensator Synthesis for Sampled-Data Delay Systems." Circuits, Systems, and Signal Processing 38, no. 5 (October 29, 2018): 2055–71. http://dx.doi.org/10.1007/s00034-018-0971-9.

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24

Torrico, Bismark Claure, Wilkley Bezerra Correia, and Fabrício Gonzalez Nogueira. "Simplified dead-time compensator for multiple delay SISO systems." ISA Transactions 60 (January 2016): 254–61. http://dx.doi.org/10.1016/j.isatra.2015.10.018.

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25

Liu, J. Z., J. K. Pieper, and B. W. Surgenor. "Deadtime Compensation and Zero Frequency Decoupling of a Thermal Hydraulic Process." Journal of Dynamic Systems, Measurement, and Control 114, no. 3 (September 1, 1992): 527–31. http://dx.doi.org/10.1115/1.2897382.

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This brief details the design and experimental implementation of a practical multivariable controller applied to a thermal hydraulic process. Features of the design include a first-order plus deadtime process model, zero frequency decoupling, and multivariable deadtime compensation. The deadtime compensator allowed higher loop gains and consequently improved overall performance. Practical first order prediction based on an estimated delay and process time constant achieved the deadtime compensation. The high gain controller effectively handled both setpoint changes and disturbance rejection. An intelligent choice of estimation schemes yielded a simple but accurate model.

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26

Jin, Qibing, Wu Cai, and Xinghan Du. "Improved disturbance observer-based control for multivariable processes with time delays based on modified inverse model." Transactions of the Institute of Measurement and Control 42, no. 3 (September 5, 2019): 339–50. http://dx.doi.org/10.1177/0142331219869429.

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In this paper, a modified multivariable disturbance observer-based (MDOB) design method is proposed to improve disturbance rejection performance for multiple-input-multiple-output (MIMO) processes with multiple time delays. Two important issues in MDOB control are studied here: computation of the inverse model and design of the filter. First, to reduce the influence of time delays, the nominal process is factorized as a diagonal time delay matrix and a remaining transfer function matrix, and the remaining part is used to design the inverse model in MDOB. Considering the difficulty of matrix inversion, the Nyquist set is used to describe the dynamic of the inverse model, and accordingly, the simplified inverse model is obtained by the curve fitting technique. In addition, to guarantee the properness and stability of the simplified inverse model, a compensator is introduced. Rules for selecting compensator parameters are given. Finally, with the proposed inverse model and compensator, the filter [Formula: see text] is optimized by minimizing the H∞ norm of the disturbance estimation error. The filter constants are determined by fully consider the disturbance rejection performance and robustness of the system. Simulation examples are presented to illustrate the effectiveness and merits of the proposed method.

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27

Yamada, Kou, Nghia Thi Mai, Yoshinori Ando, Takaaki Hagiwara, Iwanori Murakami, and Tatsuya Hoshikawa. "A Design Method for Stabilizing Modified Smith Predictors for Multiple-Input/Multiple-Output Time-Delay Plants." Key Engineering Materials 459 (December 2010): 221–33. http://dx.doi.org/10.4028/www.scientific.net/kem.459.221.

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The modified Smith predictor is well known as an effective time-delay compensator for a plant with large time-delays, and several papers on the modified Smith predictor have been published. The parameterization of all stabilizing modified Smith predictors for single-input/single-output time-delay plants is obtained by Yamada et al. However, they do not examine the parameterization of all stabilizing modified Smith predictors for multiple-input/multiple-output time-delay plants. The purpose of this paper is to expand the result by Yamada et al. and to propose the parameterization of all stabilizing modified Smith predictors for multiple-input/multiple-output time-delay plants. Control characteristics of the control system using obtained parameterization of all stabilizing modified Smith predictors are also given. Finally, a numerical example is illustrated to show the effectiveness of proposed parameterization of all stabilizing modified Smith predictors.

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28

Ning, Xizhan, Zhen Wang, and Bin Wu. "Kalman Filter-Based Adaptive Delay Compensation for Benchmark Problem in Real-Time Hybrid Simulation." Applied Sciences 10, no. 20 (October 13, 2020): 7101. http://dx.doi.org/10.3390/app10207101.

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Real-time hybrid simulation (RTHS) is a versatile, effective, and promising experimental method used to evaluate the structural performance under dynamic loads. In RTHS, the emulated structure is divided into a numerically simulated substructure (NS) and a physically tested substructure (PS), and a transfer system is used to ensure the force equilibrium and deformation compatibility between the substructures. Owing to the inherent dynamics of the PS and transfer system (referred to as a control plant in this study), there is a time-delay between the displacement command and measurement. This causes de-synchronization between the boundary of the PS and NS, and affects the stability and accuracy of the RTHS. In this study, a Kalman filter-based adaptive delay compensation (KF-ADC) method is proposed to address this issue. In this novel method, the control plant is represented by a discrete-time model, whose coefficients are time-varying and are estimated online by the KF using the displacement commands and measurements. Based on this time-varying model, the delay compensator is constructed employing the desired displacements. The KF performance is investigated theoretically and numerically. To assess the performance of the proposed strategy, a series of virtual RTHSs are performed on the Benchmark problem in RTHS, which was based on an actual experimental system. Meanwhile, several promising delay-compensation strategies are employed for comparison. Results reveal that the proposed time-delay compensation method effectively enhances the accuracy, stability, and robustness of RTHS.

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29

Wang, Yan Ping, Qi Xin Zhu, and Zhi Ping Li. "Optimal State Feedback Control in Operator Domain for Multi-Rate Networked Control Systems with Long Time Delay." Applied Mechanics and Materials 241-244 (December 2012): 1672–76. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1672.

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By multi-rate networked control systems (NCS), we mean the sampling periods of the sensor, the controller and the actuator in networked control systems are not the same, that is to say there are more than one sampling rate in networked control systems. For the long time delay multi-rate NCS with event-driven controller and actuator, a stochastic discrete model is established under operator. The state feedback control laws for the multi-rate NCS in operator domain are designed by using a dynamic programming approach. The derived optimal LQG controller can be used as a delay-compensator for multi-rate NCS with long time delays. An example is given to verify the theory results of this paper.

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30

Li, Binbin, Yaoyao Wang, Kangwu Zhu, Bai Chen, and Hongtao Wu. "Structure design and control research of a novel underwater cable-driven manipulator for autonomous underwater vehicles." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, no. 1 (June 4, 2019): 170–80. http://dx.doi.org/10.1177/1475090219851948.

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Aiming at the requirements of lightweight, low energy consumption and low inertia of the manipulators for autonomous underwater vehicles, this article presents a novel underwater cable-driven manipulator for autonomous underwater vehicles. Thanks to the cable-driven mechanism, the motors are installed remotely from joints, which can reduce the disturbance of the motion of the manipulator to the system and extend the operation time under the premise of limited energy. Cable–sheath mechanism is used to realize the motors to be fixedly mounted on the base (postposition). A prototype named Polaris-II is assembled, and experiments are carried out with the time-delay control scheme. Although the control effect of a single time-delay controller is good, there exist large errors caused by the reversing of joints. Therefore, a fuzzy compensator is designed and added to the time-delay controller to suppress the large errors. The experimental results show that the time-delay controller with a fuzzy compensator has a good inhibitory effect on the large errors while maintaining good control effect.

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31

SHIMEMURA, Etsujiro, Kenko UCHIDA, and Akira KOJIMA. "Design of Finite Dimensional Compensator for a System with Delay." Transactions of the Society of Instrument and Control Engineers 25, no. 7 (1989): 818–20. http://dx.doi.org/10.9746/sicetr1965.25.818.

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32

Braig, Christoph, and Alexei Erko. "Broadband Time-Delay and Chirp Compensator for X-ray Pulses." Photonics 9, no. 5 (April 28, 2022): 302. http://dx.doi.org/10.3390/photonics9050302.

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A new type of aberration-corrected time-delay compensating monochromator (TDCM) for soft X-rays is presented. Composed of two identical reflection zone plates (RZPs) on spherical substrates and an intermediate flat mirror for band-pass selection, the TDCM can operate in a wide energy range of about ±20% around the design energy of 410eV. Assuming a source size of 50μm and an angular acceptance of 1 mrad, the spectral resolving power may reach 6×102, at a pulse length as short as 4.3femtoseconds(fs). In the case of μm-sized sources, the resolution can be better than 0.1eV and the sub-fs regime could become accessible. The overall transmission efficiency varies within (4.2–6.0)% across the energy range (310–510) eV. In the complementary mode, chirped-pulse compression works as well. Depending on the properties of the source, simulations predict an up to 9-fold reduction in pulse duration, whereas ≤50% of the peak intensity is maintained.

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Cao, Yue, Xinyi Liu, and Wei-Tao Liu. "A broadband and compact femtosecond delay compensator with birefringent crystals." Laser Physics Letters 14, no. 3 (January 24, 2017): 035302. http://dx.doi.org/10.1088/1612-202x/aa5692.

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Chen, Yu-Chuan, Xiao-Jun Fang, Jian Li, Xiao-Yan Liang, Heng-Li Zhang, Bao-Hua Feng, Xiu-Lan Zhang, Ling-An Wu, and Zu-Yan Xu. "Efficient femtosecond optical parametric generator with a birefringent delay compensator." Applied Optics 40, no. 15 (May 20, 2001): 2579. http://dx.doi.org/10.1364/ao.40.002579.

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Li, Ji, and Xue Song Zhou. "Linear Feedback Control Research on Hopf Bifurcation in Wind Power System." Advanced Materials Research 512-515 (May 2012): 728–31. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.728.

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Hopf bifurcation frequently results in periodical oscillation instability in the nonlinear system. For Hopf bifurcation at equilibrium point in the wind power system, Hopf bifurcation point of the wind power system with static var compensator is calculated based on the continuation method. The analysis shows that the increase of reactive power will lead to Hopf bifurcation, static var compensation can delay Hopf bifurcation and improve voltage stability region via reactive power compensation, in order to eliminate Hopf bifurcation, a unified and simple linear feedback control method is adopted. The results indicate that the method put forward in the research is effective to eliminate Hopf bifurcation in the wind power system

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36

Okuya, Akihiro, Osamu Kaneko, and Shigeru Yamamoto. "FRIT of the Smith Compensator for MIMO Time Delay Systems―The Case of Output Delays." Transactions of the Institute of Systems, Control and Information Engineers 28, no. 2 (2015): 58–65. http://dx.doi.org/10.5687/iscie.28.58.

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Kaithamalai, Udhayakumar, Lakshmi Ponnusamy, and Boobal Kandasamy. "Hybrid posicast controller for a DC-DC buck converter." Serbian Journal of Electrical Engineering 5, no. 1 (2008): 121–38. http://dx.doi.org/10.2298/sjee0801121k.

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A new Posicast compensated hybrid controller for the DC-DC Buck converter is investigated. Posicast is a feed forward compensator, which eliminates the overshoot in the step response of a lightly damped system. However, the traditional method is sensitive to variations in natural frequency. The new method described here reduces this undesirable sensitivity by using Posicast within the feedback loop. Design of the Posicast function is independent of computational delay. The new controller results in a lower noise in the control signal, when compared to a conventional PID controller.

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Molina-Cabrera, Alexander, Mario A. Ríos, Yvon Besanger, Nouredine Hadjsaid, and Oscar Danilo Montoya. "Latencies in Power Systems: A Database-Based Time-Delay Compensation for Memory Controllers." Electronics 10, no. 2 (January 18, 2021): 208. http://dx.doi.org/10.3390/electronics10020208.

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Time-delay is inherent to communications schemes in power systems, and in a closed loop strategy the presence of latencies increases inter-area oscillations and security problems in tie-lines. Recently, Wide Area Measurement Systems (WAMS) have been introduced to improve observability and overcome slow-rate communications from traditional Supervisory Control and Data Acquisition (SCADA). However, there is a need for tackling time-delays in control strategies based in WAMS. For this purpose, this paper proposes an Enhanced Time Delay Compensator (ETDC) approach which manages varying time delays introducing the perspective of network latency instead dead time; also, ETDC takes advantage of real signals and measurements transmission procedure in WAMS building a closed-loop memory control for power systems. The strength of the proposal was tested satisfactorily in a widely studied benchmark model in which inter-area oscillations were excited properly.

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Pană, Valentin. "Pilot-Induced Oscillations Prevention Using Anti-Windup Compensation in the Presence of Time-Delay." Applied Mechanics and Materials 325-326 (June 2013): 1262–66. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.1262.

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The paper presents a compensator design technique for systems with saturating actuators in order to recover as much as possible the performance of the unsaturated case. This anti-windup scheme is obtained using H-infinity optimization methodology. The proposed design approach allows to obtain a anti-windup controller that accounts for time-delays in the control system. Comparative result are presented for the two design methods and time simulation of the nonlinear system are used to analyze the performances of both designs. A reduced order anti-windup controller procedure is also investigated. Keywords: PIO, anti-windup, rate saturation, compensator.

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Bas¸er, Ulviye. "Output Feedback H∞ Control Problem for Linear Neutral Systems: Delay Independent Case." Journal of Dynamic Systems, Measurement, and Control 125, no. 2 (June 1, 2003): 177–85. http://dx.doi.org/10.1115/1.1567316.

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This paper presents the solution of output feedback H∞ control problem for linear neutral systems with unknown constant multiple state delays in delay independent case, without any restrictions on plant matrices D12 and D21. First, some sufficient conditions for the solution of this problem are obtained in closed-loop system matrices in both linear matrix inequality (LMI) and algebraic Riccati inequality (ARI) forms, by standard Lyapunov-Krazovskii functional in delay independent multi-delay case. Because of the complexity of the solution of the compensator from these inequalities, equivalent sufficient conditions are derived for designing output feedback controller which stabilizes the closed-loop neutral system under consideration and guarantees an H∞-norm bound constraint on the disturbance attenuation. These conditions are of the form two ARIs and, for simplicity in computation equivalent LMIs are given. Finally, output feedback H∞ controller design is achieved and the results are illustrated in some numerical examples.

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Wu, Chia-Hsuan, Guan-Rong Huang, Cheng-Chih Chou, Ching-Ming Lai, and Liang-Rui Chen. "A Compensated Peak Current Mode Control PWM for Primary-Side Controlled Flyback Converters." Energies 14, no. 22 (November 9, 2021): 7458. http://dx.doi.org/10.3390/en14227458.

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In this paper, a feedback compensator (FBC) and a Feedforward compensator (FFC) are proposed to construct a novel compensated peak current mode control pulse width modulation (CPC-PWM) for primary-side controlled flyback converters. Using the proposed FBC, the PWM duty cycle of an abnormal operating flyback converter would be descended to limit the output current for reducing power dissipation. Using the proposed FFC, the effect of delay time would be descended to reduce the over-flow current for increasing the current accuracy. In this paper, the operating principle and mathematical model are described and analyzed. Then, the component values are well designed to satisfy the electrical specifications. Finally, a prototype is designed and realized to access system performance. The experimental results show that the proposed CPC-PWM can validate in a wide input voltage range and output short conditions, which also has good current accuracy and reduces power dissipation by about 68%.

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Rawashdeh, Laith, Igor Zakharov, and Oleg Zaporozhets. "Nonlinearity Correction in Dynamic Measuring Devices Using Neural Network Models." Pomiary Automatyka Robotyka 24, no. 4 (December 30, 2020): 57–60. http://dx.doi.org/10.14313/par_238/57.

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A neural network compensator for the nonlinearity of a dynamic measuring instrument is proposed, which allows restoring the value of the measured input signal. The inverse model of a nonlinear dynamic measuring device is implemented based on a three-layer perceptron supplemented by delay lines of input signals. The properties of the proposed neural network compensator are studied through simulation computer modelling using various types of calibration input signals for the training of an artificial neural network.

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Song, De-Ning, Jian-Wei Ma, Zhen-Yuan Jia, Feng-Ze Qin, and Xiao-Xuan Zhao. "Synergistic real-time compensation of tracking and contouring errors for precise parametric curved contour following systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 19 (October 17, 2017): 3367–83. http://dx.doi.org/10.1177/0954406217736340.

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The tracking and contouring errors are inevitable in real computer numerical control contour following because of the reasons such as servo delay and dynamics mismatch. In order to improve the motion accuracy, this paper proposes a synergistic real-time compensation method of tracking and contouring errors for precise parametric curve following of the computer numerical control systems. The tracking error for each individual axis is first compensated, by using the feed-drive models with the consideration of model uncertainties, to enhance the tracking performances of all axes. Further, the contouring error is estimated and compensated to improve the contour accuracy directly, where a high-precision contouring-error estimation algorithm, based on spatial circular approximation of the desired contour neighboring the actual motion position, is presented. Considering that the system structure is coupled after compensation, the stability of the coupled system is analyzed for design of the synergistic compensator. Innovative contributions of this study are that not only the contouring-error can be estimated with a high precision in real time, but also the tracking and contouring performances can be simultaneously improved although there exist modeling errors and disturbances. Simulation and experimental tests demonstrate the effectiveness and advantages of the proposed method.

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Chou, Jyh-Horng, Ing-Rong Horng, and Bor-Sen Chen. "Dynamical feedback compensator for uncertain time-delay systems containing saturating actuator." International Journal of Control 49, no. 3 (March 1989): 961–68. http://dx.doi.org/10.1080/00207178908559678.

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Bahk, Seung-Whan, Jake Bromage, and Jonathan D. Zuegel. "Offner radial group delay compensator for ultra-broadband laser beam transport." Optics Letters 39, no. 4 (February 14, 2014): 1081. http://dx.doi.org/10.1364/ol.39.001081.

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Salloum, Rafik, Bijan Moaveni, and Mohammad Reza Arvan. "RobustH∞feedback compensator design for an electromechanical actuator with time delay." Journal of the Chinese Institute of Engineers 38, no. 6 (May 28, 2015): 751–59. http://dx.doi.org/10.1080/02533839.2015.1027741.

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Xu, Jian-Xin, Qiuping Hu, Tong Heng Lee, and Shigehibo Yamamoto. "Iterative learning control with Smith time delay compensator for batch processes." Journal of Process Control 11, no. 3 (June 2001): 321–28. http://dx.doi.org/10.1016/s0959-1524(00)00034-2.

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Beiraghi, M., and A. M. Ranjbar. "Adaptive Delay Compensator for the Robust Wide-Area Damping Controller Design." IEEE Transactions on Power Systems 31, no. 6 (November 2016): 4966–76. http://dx.doi.org/10.1109/tpwrs.2016.2520397.

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Sadalla, Talar, Dariusz Horla, Wojciech Giernacki, and Piotr Kozierski. "Dynamic anti‐windup compensator for fractional‐order system with time‐delay." Asian Journal of Control 22, no. 5 (September 4, 2019): 1767–81. http://dx.doi.org/10.1002/asjc.2200.

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us Saqib, Najam, Muhammad Rehan, Muntazir Hussain, Naeem Iqbal, and Haroon ur Rashid. "Delay-range-dependent static anti-windup compensator design for nonlinear systems subjected to input-delay and saturation." Journal of the Franklin Institute 354, no. 14 (September 2017): 5919–48. http://dx.doi.org/10.1016/j.jfranklin.2017.07.028.

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