{"title":"Adaptive Finite-time Tracking Control for Constrained Pure-feedback Systems With Time-varying Delays and Unknown Initial States","authors":"Tian Xu, Yuxiang Wu","doi":"10.1007/s12555-022-1206-1","DOIUrl":"https://doi.org/10.1007/s12555-022-1206-1","url":null,"abstract":"<p>This paper investigates the adaptive finite-time tracking control problem for a class of constrained pure-feedback systems with time-varying delays and unknown initial states. By designing a novel shifting function and using the state transformation, there is no need to know the initial value of states. Instead of employing barrier Lyapunov functions, the modified nonlinear state-dependent functions are constructed to solve the deferred state constraints, avoiding the feasibility conditions on virtual controllers. The effect of time-varying delays is eliminated by combining the radial basis function neural networks with a finite covering lemma, and the requirement that the derivative of time-varying delays should be less than one in Lyapunov-Krasovskii functional method is relaxed. The asymmetric saturation nonlinearity is solved by designing an auxiliary system. The system coordinate transformation is employed to solve the design difficulty brought by the nonaffine structure. Then, an adaptive finite-time tracking control scheme is developed based on the command filtered backstepping technique. The developed control scheme can not only make all states satisfy the asymmetric time-varying constraints after a predefined time, but also guarantee the finite-time tracking performance. Finally, simulation examples are given to demonstrate the effectiveness of the proposed scheme.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"59 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Robust Gradient Iterative Estimation Algorithm for ExpARX Models With Random Missing Outputs","authors":"Chuanjiang Li, Wei Dai, Ya Gu, Yanfei Zhu","doi":"10.1007/s12555-023-0555-8","DOIUrl":"https://doi.org/10.1007/s12555-023-0555-8","url":null,"abstract":"<p>This study presents a LookAhead-RAdam gradient iterative algorithm to identify ExpARX models with random missing outputs. The LookAhead-RAdam gradient iterative algorithm is used to optimize the step size of each element and adjust the direction to effectively update the ExpARX model parameter estimation through the estimated outputs. Compared to the classical gradient iterative algorithm, this study improves the estimation accuracy of the missing outputs and the parameter estimation convergence rate by introducing the LookAhead algorithm and RAdam algorithm. To validate the algorithm developed, a series of bench tests were conducted with computational experiments. Finally, the effectiveness of the proposed design approach is demonstrated by a simulation example.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"37 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Hybrid Systems Approach to Consensus of Nonlinear Multi-agent Systems With Self-triggered Output Feedback Control","authors":"Wenliang Pei, Changchun Hua, Hailong Cui, Guanglei Zhao","doi":"10.1007/s12555-023-0409-4","DOIUrl":"https://doi.org/10.1007/s12555-023-0409-4","url":null,"abstract":"<p>This paper develops a hybrid systems approach to address the self-triggered leader-following consensus problem of nonlinear multi-agent systems. First, a distributed dynamic output feedback consensus control protocol is proposed, and a novel hybrid dynamic self-triggering mechanism (HDSTM), which can provide a pre-designable minimum triggering interval (MITI) for the adjacent events, is developed to reduce the usage of communication resources. Then, by means of internal variables, a hybrid model, including both flow and jump dynamics, is constructed to describe the closed-loop dynamics. Based on this hybrid model, Lyapunov-based consensus analysis and HDSTM design results are derived. Compared to the existing related works, the main superiority of the proposed approach is that the inter-event communication intervals can always be computed in advance and no less than the given MITI. Finally, a numerical example is provided to show the effectiveness.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"25 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Application of a Hybrid Improved Particle Swarm Algorithm for Prediction of Cutting Energy Consumption in CNC Machine Tools","authors":"Jidong Du, Yan Wang, Zhicheng Ji","doi":"10.1007/s12555-022-0784-2","DOIUrl":"https://doi.org/10.1007/s12555-022-0784-2","url":null,"abstract":"<p>Estimation and analysis of energy consumption for machine tool is the basis of energy efficiency improvement. To improve the accuracy of ELM algorithm in CNC machine tool energy consumption prediction, a prediction method based on an improved particle swarm optimization (CAPSO) algorithm and an extreme learning machine (ELM) is proposed. The contribution of the algorithm includes the following three aspects. First, sobol sequence is used to initialize the PSO population to make distribution of initial population more even in solution space. Second, the center wanders and boundary neighborhood updates strategy are used to improve the population quality and convergence rate of PSO. Then, to avoid the optimal local solution, the adaptive inertia weight is introduced to achieve the stochastic perturbation of the population. The performance of the algorithm is tested by ten benchmark function, indicating that the CAPSO ensures the search accuracy and improves the algorithm’s convergence rate. Finally, the CAPSO algorithm is used to optimize the weights and thresholds of an ELM, and the CAPSO-ELM cutting energy consumption prediction model is established. Case analysis and comparative experiments show that the stability, prediction accuracy and generalization ability of CAPSO-ELM model are better than those of other models.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"10 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Convergence of a Democratic System Controlled by Dynamic Social Networks","authors":"Seong-Jin Park","doi":"10.1007/s12555-023-0515-3","DOIUrl":"https://doi.org/10.1007/s12555-023-0515-3","url":null,"abstract":"<p>This paper presents some graph-theoretic conditions for a democratic system controlled by a social network to converge to a regressive or progressive system over time. The democratic system is modeled as a finite state automaton, and a social network of agents is modeled as a directed graph. Agents are controllers making decisions to enable or disable events such that their objectives are to be met. Based on the individual decisions of agents, the final decision is made by the majority rule. Specifically, the conditions obtained imply two strategies for the groups of regressive or progressive agents to achieve their objectives: one is to prevent informed agents in other groups from influencing uninformed agents, and the other is to make at least one uninformed agent in every cycle follow the decisions of the group.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"2016 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"General Decay Synchronization of State and Spatial Diffusion Coupled Delayed Memristive Neural Networks With Reaction-diffusion Terms","authors":"Yanli Huang, Xin Zhao","doi":"10.1007/s12555-023-0122-3","DOIUrl":"https://doi.org/10.1007/s12555-023-0122-3","url":null,"abstract":"<p>This paper aims at the study of the general decay synchronization of state and spatial diffusion coupled delayed reaction-diffusion memristive neural networks (CDRDMNNs). At first, we present the general decay synchronization concept for the considered network based on <i>ψ</i>-type stability, then we go deeply into the establishment of general decay synchronization criterion of state CDRDMNNs by excogitating a proper controller and utilizing an opportune Lyapunov functional, thereby gain a sufficient condition for attaining general decay synchronization of state CDRDMNNs. Subsequently, we devote ourselves to investigating the general decay synchronization of spatial diffusion CDRDMNNs and derive an adequate condition for realizing the general decay synchronization of this type of network. Next, some sufficient conditions which ensure robust general decay synchronization of state CDRDMNNs and spatial diffusion CDRDMNNs with uncertain parameters are concluded by utilizing various types of inequality techniques. Ultimately, the efficacy of the acquired general decay synchronization results are certified via numerical simulations of two examples.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"25 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Output Feedback Based Adaptive Continuous Sliding Mode Control for Mechanical Systems With Actuator Faults","authors":"Tao Jiang, Yan Yan, Shuang-He Yu, Tie-Shan Li","doi":"10.1007/s12555-023-0490-8","DOIUrl":"https://doi.org/10.1007/s12555-023-0490-8","url":null,"abstract":"<p>In this article, an adaptive continuous sliding mode control (SMC) scheme is presented for the trajectory tracking problem of mechanical systems with parameter uncertainties, external disturbances and actuator faults. The hyperbolic tangent function is widely used to replace the signum function in SMC to ensure that the robust term is continuous and to reduce chattering. Since such an approach is difficult for SMC schemes with adaptive gain to induce system stability through Lyapunov functions, we reconstruct the hyperbolic tangent function by taking both the adaptive control gain and sliding variables as inputs. The designed gain dynamics do not require a priori upper bound on lumped uncertainties, including parameter uncertainties, external disturbances and actuator faults, and ensure no overestimated gains. Besides, an adaptive dual-layer super-twisting (ADLST) observer is adopted to accurately estimate unmeasurable velocities, which achieves the synthesis of an adaptive sliding mode observer and the continuous SMC method with adaptive gain. It is proven through the Lyapunov function that all closed-loop signals are ultimately bounded. Comparative simulations are conducted on a two-link rigid manipulator to demonstrate the effectiveness of the adopted observer and the proposed scheme.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"70 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaohan Fang, Rong Cheng, Songsong Cheng, Yuan Fan
{"title":"Nonsingular Fixed-time Fault-tolerant Sliding Mode Control of Robot Manipulator With Disturbance Observer","authors":"Xiaohan Fang, Rong Cheng, Songsong Cheng, Yuan Fan","doi":"10.1007/s12555-022-0594-6","DOIUrl":"https://doi.org/10.1007/s12555-022-0594-6","url":null,"abstract":"<p>This paper presents a nonsingular sliding mode fault-tolerant control method with fixed-time convergence for a class of robot manipulators with uncertainties, external disturbances, and actuator failures. We estimate self-friction and external disturbances by designing a disturbance observer. Furthermore, based on the disturbance observer, we propose a sliding mode control method for the considered uncertain robot manipulator. Finally, the effectiveness of the proposed method is demonstrated by a numerical example.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"23 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Event-triggered Hybrid Force Feedback Architecture With Tank-based Stabilization Method for Complicated Bilateral Teleoperation Tasks","authors":"Zhitao Gao, Fangyu Peng, Chen Chen, Yukui Zhang, Yu Wang, Rong Yan, Xiaowei Tang","doi":"10.1007/s12555-023-0173-5","DOIUrl":"https://doi.org/10.1007/s12555-023-0173-5","url":null,"abstract":"<p>Bilateral teleoperation with force feedback allows the operators to apply their skills to accomplish challenging tasks safely. Most teleoperation bilateral systems are designed for single interaction scenarios and low-frequency force feedback, which limits their overall performance in complex interaction tasks. Furthermore, the use of passive controllers to ensure system stability can lead to further reductions in force transparency. This paper addresses the hybrid force feedback problem in complex interaction tasks with multiple stages, aiming at enhancing the practicality and robustness of teleoperation systems for complex interaction tasks, as well as reducing the force distortion caused by passive controllers. Firstly, an event-triggered hybrid force feedback architecture is proposed. Within this architecture, we introduce a two-channel fully transparent method with an explicit force controller (FT2-EFC), to enable model-free force tracking during both free motion and vibration contact stages. Besides, an adaptive impedance matching (AIM) algorithm is proposed to improve the physical interaction characteristics in the contact transient stage. Secondly, we present the operator passivity reference dual boundary energy tank (OPRDB-ET) method, which not only ensures the delay stability of the force architecture but also minimizes force distortion resulting from passive damping injection. Finally, experiments demonstrated that the proposed methods ensure the accurate tracking ability of hybrid forces in all stages of complicated interaction tasks and the slight force distortion under communication delay.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"98 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Method of Predicting Braking Intention Using LSTM-CNN-Attention With Hyperparameters Optimized by Genetic Algorithm","authors":"Wei Yang, Yu Huang, Kongming Jiang, Zhen Zhang, Ketong Zong, Qin Ruan","doi":"10.1007/s12555-021-1113-x","DOIUrl":"https://doi.org/10.1007/s12555-021-1113-x","url":null,"abstract":"<p>Prediction of a driver’s braking intention enables the advanced driver assistance system (ADAS) to intervene in the braking system as early as possible, which may shorten braking distance and improve driving safety. This paper proposes a novel deep learning model called LSTM-CNN-Attention that combines a long short-term memory (LSTM) neural network, convolutional neural network (CNN), and Attention mechanism for extracting spatiotemporal features of multi-sensor data to improve prediction accuracy. The proposed model inherits both temporal and spatial feature extraction abilities from LSTM and CNN. The LSTM-CNN-Attention model has a parallel architecture, which enhances the feature extraction ability of the model for multi-sensor time series data and improves the prediction accuracy of the driver’s braking intention before the braking action. Furthermore, a driving simulator is set up to sample driving data for training and evaluating the proposed method. According to the results of the experiment, the model obtains up to 3.16% higher accuracy than the baseline models such as LSTM, CNN, and bidirectional LTSM (Bi-LSTM). Additionally, the influence of sliding window size and prediction horizon on the performance of the method is investigated. A method of tuning hyperparameters using the genetic algorithm is presented. The results demonstrate that the prediction accuracy increases by about 2% after being optimized by GA.</p>","PeriodicalId":54965,"journal":{"name":"International Journal of Control Automation and Systems","volume":"33 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}