{"title":"Three-dimensional robust prescribed-time cooperative guidance for leader-follower strategy based on state observer: Simultaneous attack with impact angle control.","authors":"Sayed Bagher Fazeliasl, Seyyed Sajjad Moosapour, Saleh Mobayen","doi":"10.1016/j.isatra.2025.05.016","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.016","url":null,"abstract":"<p><p>This paper proposes a robust Prescribed-Time Cooperative Guidance (PTCG) method for leader-follower interceptors, enabling simultaneous attacks on maneuvering targets in Three-Dimensional (3D) space while satisfying impact angle constraint. Existing methods, such as fixed-time and finite-time approaches, due to their dependence on control parameters, are unable to arbitrarily predefine the convergence time and estimate the system states at a desired time. This limitation reduces their flexibility for application in complex operational scenarios, such as simultaneous attacks on maneuvering targets with specific constraints. To address this limitation, a robust Prescribed-Time Consensus Control (PTCC) is first designed for nominal nonlinear Multi-Agent Systems. Subsequently, a Prescribed-Time State Observer (PTSO) is introduced to derive leader states. Finally, after modeling the relative motion equations within the Line-Of-Sight (LOS) framework, using the proposed PTSO and PTCC approaches, and advanced Sliding Mode Control (SMC), robust guidance laws are presented in the LOS direction and perpendicular to it. These laws ensure that leader and followers simultaneously attack the maneuvering target at the prescribed-time with desired impact angles. Comparative simulations and experimental results validate the efficiency and effectiveness of the designed guidance laws.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-11DOI: 10.1016/j.isatra.2025.05.013
Zhaoji Wang, Shouzhao Sheng
{"title":"Finite time disturbance observer-based adaptive composite control for disturbed unmanned helicopter.","authors":"Zhaoji Wang, Shouzhao Sheng","doi":"10.1016/j.isatra.2025.05.013","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.013","url":null,"abstract":"<p><p>In this paper, a composite control scheme integrating finite time disturbance observer (FTDO) and adaptive control is presented to solve the trajectory tracking issues of unmanned helicopters with matched and mismatched disturbances. Firstly, an FTDO is employed to accurately estimate the disturbance information within finite time, thereby mitigating the impact of lumped disturbances on the helicopter system and enhancing the anti-disturbance capability of the control scheme. Subsequently, the disturbance compensation term is incorporated into the controller, and a data-driven adaptive proportional-derivative (APD) controller is designed to track the desired signals of yaw angle and position. The introduction of the adaptive mechanism enables real-time parameter adjustment based on system data, effectively eliminating parameter deviations, improving control accuracy, and enhancing the adaptability of controller in complex environments. In addition, the disturbance estimation error is embedded into the closed-loop stability analysis, and the system stability is rigorously demonstrated using Lyapunov theory. Finally, simulation experiments compare the proposed method with improved active disturbance rejection control (ADRC) and FTDO-based continuous terminal sliding mode control (CTSMC). The results demonstrate that the proposed scheme achieves strong robustness and high control accuracy even in the presence of both matched and mismatched disturbances.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-10DOI: 10.1016/j.isatra.2025.05.014
Bin Guo, Xingxing You, Songyi Dian, Yuqi Zhu
{"title":"Adaptive safety critical compensation control for nonlinear jump systems with its application.","authors":"Bin Guo, Xingxing You, Songyi Dian, Yuqi Zhu","doi":"10.1016/j.isatra.2025.05.014","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.014","url":null,"abstract":"<p><p>In this article, the problem of adaptive safety critical tracking control for nonlinear Markovian jump systems (NMJSs) is addressed, and an event-observer-based compensation strategy is proposed. The main innovation of the presented approach is to effectively cope with the unexpected actuator faults, lumped disturbances, nonlinear uncertainties, and limited computation resources for the NMJSs. In the most existing compensation schemes, only the bias fault without jump dynamics is addressed. Here, the combined faults, disturbances and limited measurable conditions are considered. To solve the limited variable measurable problem, an integrated dynamic event-based state observer scheme is constructed. With the help of state estimation error, a high-order lumped disturbance observation scheme is established without the prior knowledge of disturbance. By virtue of observation values, an event-observer-based system performance recovery controller is proposed. In this control framework, to achieve the disturbance rejection and tracking convergence purposes, an observer-aided sliding mode surface is established. What's more, to reduce the communication burden, a novel dynamic trigger scheme in control channel and a multi-choice-based trigger condition in sensor channel are proposed, and the controller is reconstructed with the event choice. Finally, two numerical examples and the application to a robot system show the safety compensation abilities of the developed approach.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144121925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multi-bearing fault diagnosis method based on convolutional autoencoder causal decoupling domain generalization.","authors":"Xinyang Cui, Hongfei Zhan, Kang Han, Junhe Yu, Rui Wang, Guojun Huang","doi":"10.1016/j.isatra.2025.05.008","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.008","url":null,"abstract":"<p><p>Currently, most transfer learning (TL) methods for solving bearing fault diagnosis primarily focus on diagnosing a single bearing. However, in practical engineering scenarios, multi-bearing co-occurrence is often encountered, and joint diagnostic research under such conditions has received less attention. Additionally, it is challenging to collect sufficient fault samples for training, and due to changes in working conditions, the collected signals often follow different distributions. These factors limit the generalization ability of transfer learning models. Furthermore, most fault diagnosis methods for domain generalization primarily model the statistical correlation between time-series data and labels without effectively predicting the actual data, resulting in a relatively superficial description of the data generation process, which may introduce personal bias. To address these challenges, this paper proposes a causal decoupling network based on convolutional autoencoder (CDN-CAE) to diagnose and locate faults in multi-bearing systems using vibration signals from auxiliary bearings. First, maximum entropy optimization and mutual information neural estimation are introduced to decouple the time-series data into causal and non-causal factors, thereby reconstructing the data generation process comprehensively. On this basis, an aggregation loss is proposed to separate causal and non-causal factors, enabling better aggregation of the same fault type and improving the generalization ability of the method. Finally, a reconstruction loss is introduced to ensure the completeness of the information within the decoupled factors and to enhance the network's robustness. Experiments conducted on a multi-bearing device demonstrate that the proposed method achieves high accuracy and overall stability.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-09DOI: 10.1016/j.isatra.2025.05.012
Zi-Yun Wang, Yue Wang, Yan Wang
{"title":"ZSM-IMM and ZPRM-IMM: Two novel interacting multiple model based state estimation algorithms for stochastic switching systems under unknown but bounded noise.","authors":"Zi-Yun Wang, Yue Wang, Yan Wang","doi":"10.1016/j.isatra.2025.05.012","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.012","url":null,"abstract":"<p><p>In this study, two novel state-estimation algorithms based on an interacting multiple model (IMM) are proposed for stochastically switched linear systems. First, a zonotopic filter is derived from segment minimization. Then, the zonotopic segment minimization based IMM algorithm is proposed, which comprises four steps: input interaction, segment minimization filtering, model probability updating, and output fusion. In addition, to avoid the upper and lower bounds of the zonotope at individual moments from wrapping around the true value, the zonotopic P-radius minimization based IMM algorithm is also studied, which creatively employs the P-radius minimization process in the zonotopic updating step and converts it into a linear matrix inequalities problem. Finally, the two proposed algorithms are verified by numerical simulation and an experimental analysis of a buck-boost circuit.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144087119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-08DOI: 10.1016/j.isatra.2025.05.011
Sepideh Jahani VakilKandi, Farhad Bayat, Abolfazl Jalilvand, Andrzej Bartoszewicz
{"title":"Cyber-physical systems under hybrid cyber-attacks: Resilient event-triggered H<sub>∞</sub> control approach.","authors":"Sepideh Jahani VakilKandi, Farhad Bayat, Abolfazl Jalilvand, Andrzej Bartoszewicz","doi":"10.1016/j.isatra.2025.05.011","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.011","url":null,"abstract":"<p><p>This article introduces a novel adaptive event-triggered finite-time H<sub>∞</sub> control approach for Cyber-Physical Systems (CPSs) under the influence of bounded disturbances, actuator faults, and randomly occurring hybrid cyber-attacks, including aperiodic DoS attacks, deception attacks, and replay attacks. This paper presents a novel integrated framework for hybrid attacks that consists of aperiodic DoS attacks, deception attacks, and replay attacks. To minimize continuous data transmissions in the network and maximize the utilization of limited resources, an adaptive periodic event-triggered mechanism (APETM) is developed by employing the DoS-dependent adaptive varying threshold. Compared to common event-triggered mechanisms, this method allows for periodic monitoring and effectively increases the lower bound of event intervals, making it well-suited for real-world applications. Initially, a new theoretical framework for cyber-physical systems is proposed, incorporating an adaptive periodic event-triggered mechanism under hybrid cyber-attacks, external disturbances, and actuator faults. Based on the established model, the Lyapunov-Krasovskii stability theory is employed to establish sufficient conditions for ensuring the finite-time stability with an H<sub>∞</sub> performance level. Additionally, a linear matrix inequality technique is utilized to determine the controller gains and triggering parameters. The effectiveness of the proposed method is demonstrated through a simulation of the one-link flexible joint robot systems.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-08DOI: 10.1016/j.isatra.2025.05.004
Yang Qu, Zhou Liu, Lilong Cai
{"title":"Simultaneous planning and executing (SPAE) control for a fourth-order underactuated inverted pendulum with double-layer asynchronous convergence.","authors":"Yang Qu, Zhou Liu, Lilong Cai","doi":"10.1016/j.isatra.2025.05.004","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.004","url":null,"abstract":"<p><p>The cart-type inverted pendulum is a typical fourth-order underactuated system that has been widely used in diverse industrial applications. This paper presents a new control method to handle the stability problem of a cart-type inverted pendulum. The system is divided into two second-order subsystems: an inner-layer dynamic system of the rod and an outer-layer dynamic system of the cart. Then a simultaneous planning and executing (SPAE) control method based on double-layer polynomial planning is proposed to make the inner-layer and outer-layer systems asynchronously converge in different time intervals. To achieve this asynchronous convergence, the outer-layer system adjusts the cart displacement. Its goal is to provide a smooth reference angle. The inner-layer system should track this angle quickly and precisely. In contrast to existing control approaches, the proposed method does not require parameter optimization or an accurate nonlinear model. Simulated and experimental results have verified that the proposed control method can achieve the double-layer asynchronous convergence in different time intervals, indicating its superiority over other feedback control approaches.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-07DOI: 10.1016/j.isatra.2025.05.001
Tao Wang, Yapeng Li, Jikun Li
{"title":"Observer-based fault detection for large-scale systems with event-triggered protocols.","authors":"Tao Wang, Yapeng Li, Jikun Li","doi":"10.1016/j.isatra.2025.05.001","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.001","url":null,"abstract":"<p><p>In this note, the problem of continuous linear large-scale systems fault detection based on event-triggered interval observers is considered. First, an interval observer-based fault detection scheme is proposed. The interval observer design process is mainly implemented based on positive system theory and Lyapunov stability theory, and the residual interval is constructed to determine whether the system behavior is normal. To improve the fault sensitivity and maximize the impact of the fault signal on the residual signal, the corresponding performance indicators are introduced in the interval observer design process. Second, an event-triggered protocol is added to the interval observer design to reduce the occupation of communication resources. The solution conditions of the observer matrix are derived by constructing an augmented system. In addition, it is demonstrated that no Zeno behavior occurs under the adopted event-triggered protocol. Finally, the correctness of conclusions is verified by a practical example of a large-scale system consisting of several F-18 aircraft and a numerical example.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144133328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-07DOI: 10.1016/j.isatra.2025.05.002
Yang Yang, Huang Cuicui, Dai Chunhui, Long Zhiqiang
{"title":"An active resisting disturbance control method for high-speed maglev train with weak model dependence.","authors":"Yang Yang, Huang Cuicui, Dai Chunhui, Long Zhiqiang","doi":"10.1016/j.isatra.2025.05.002","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.002","url":null,"abstract":"<p><p>With the speed of high-speed maglev increasing, external disturbances will be further aggravated, leading to a deterioration in the stability and dynamic performance of the electromagnetic levitation (EML) system. Improving the disturbance rejection capability of EML systems is crucial for ensuring safe and stable train operation. To address this challenge, this paper proposes an active resisting disturbance control method with weak model dependence, combining model reference adaptive control (MRAC) and active disturbance rejection control (ADRC). First, MRAC is used to approximate the plant to the reference model to avoid problems caused by model uncertainty. Then, a linear extended state observer (LESO) is constructed based on nominal model parameters to estimate and compensate for disturbances. Additionally, a tracking differentiator (TD) is incorporated to extract system states for constructing the MRAC law. The Lyapunov stability theory is used to prove that the EML system can achieve stability under the proposed control law. Finally, the simulation experiment and physical verification experiment are designed. The experimental results show that the proposed control method outperforms PID, SMC, and ADRC in disturbance rejection and its control performance is insensitive to the changes in model parameters and equilibrium point.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144087111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ISA transactionsPub Date : 2025-05-06DOI: 10.1016/j.isatra.2025.05.006
Mohammad Hosein Sabzalian
{"title":"Safety-critical controller design for nonlinear systems: Stabilization and robustness.","authors":"Mohammad Hosein Sabzalian","doi":"10.1016/j.isatra.2025.05.006","DOIUrl":"https://doi.org/10.1016/j.isatra.2025.05.006","url":null,"abstract":"<p><p>This study proposes innovative closed-form solutions for designing safe controllers for nonlinear affine control systems, thereby eliminating the need for real-time quadratic programming optimization. We first focus on asymptotic stabilization using a Lyapunov-based control law, referred to as the \"unsafe control\", and introduce an additional state variable alongside a \"safeguarding control\" to guarantee safe operation of the closed-loop system. The proposed closed-form scheme limits the impact of the safeguarding control on the functionality of the closed-loop system, ensuring the derivative of a control Lyapunov function remains at least negative semi-definite. User-defined parameters provide flexibility in managing safety constraints, while the method's adaptability allows for integration with existing control techniques. Furthermore, we extend our results to robust safety control for nonlinear systems subject to external disturbances, ensuring both safety and input-to-state stability. In addition to theoretical developments, the effectiveness of the proposed controllers is validated through three comprehensive case studies, demonstrating their potential in real-world applications. The results highlight the controllers' ability to maintain safety and stability without the computational burden of real-time quadratic programming, thereby enhancing their suitability for systems with fast dynamics.</p>","PeriodicalId":94059,"journal":{"name":"ISA transactions","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}