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Robust-optimal control of electromagnetic levitation system with matched and unmatched uncertainties:experimental validation

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Control Theory and Technology 2025年第1期23卷 28-48页

作者： Amit Pandey Dipak M.Adhyaru Department of Electronics and Instrumentation Engineering Institute of TechnologyNirma UniversityAhmedabadGujarat382481India

The electromagnetic levitation system(EMLS)serves as the most important part of any magnetic levitation ***,its characteristics are defined by its highly nonlinear dynamics and ***,the uncertainties in the dynamics of an electromagnetic levitation system make the controller design more ***,it is necessary to design a robust control law that will ensure the system’s stability in the presence of these *** this framework,the dynamics of an electromagnetic levitation system are addressed in terms of matched and unmatched *** robust control problem is translated into the optimal control problem,where the uncertainties of the electromagnetic levitation system are directly reflected in the cost *** optimal control method is used to solve the robust control *** solution to the optimal control problem for the electromagnetic levitation system is indeed a solution to the robust control problem of the electromagnetic levitation system under matched and unmatched *** simulation and experimental results demonstrate the performance of the designed control *** performance indices such as integral absolute error(IAE),integral square error(ISE),integral time absolute error(ITAE),and integral time square error(ITSE)are compared for both uncertainties to showcase the robustness of the designed control scheme.

关键词： Nonlinear system Robust control Optimal control HJB equation Lyapunov stability Electromagnetic levitation system

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Multi head attention based conditional progressive GAN for colon cancer histopathological images analysis

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Multimedia Tools and Applications 2025年 1-33页

作者： Mulam, Harikrishna Chikati, Venkata Rambabu Kulkarni, Anita Electronics and Instrumentation Engineering VNR Vignana Jyothi Institute of Engineering & Technology Telangana Hyderabad500090 India

Lung and Colon Cancers (LCC) are primary reasons of impermanence though imaging investigative techniques are at an advanced stage, detailed cellular-level examinations continue to require gold-standard histopathology. Traditional methods are often time-consuming and costly, leading to delays in diagnosis and potential inter-observer errors. To tackle these challenges, this research proposes a novel Multi-head Attention-based Conditional progressive Generative Adversarial Network (MACGAN) approach to analyze histopathological images effectively. This approach integrates wavelet denoising for preprocessing to effectively remove noise while preserving crucial information, enhancing image quality before classification. Then, the introduced model classifies lung colon cancer using a combination of the multi-head attention mechanism and conditional progressive generative adversarial network, which is specifically combined to strengthen the crucial details of the histopathology images and improve the classification accuracy. Subsequently, the Adaptive Trees Social Relations Optimization (ATSRO) algorithm was utilized to significantly enhance computational efficiency and model performance. Moreover, an accessible graphical user interface has been created to show the outcome of the model. The experimentations are directed through Python on Lung and Colon cancer histopathological image (LC25000) dataset, demonstrate robust performance, achieving 99.95% accuracy,99.95% precision,99.94% sensitivity, 99.94% F-measure, 99.98% specificity and 99.93% Matthews correlation coefficient. Additionally, the proposed method achieves superior efficiency, with the lowest computation time of 30 s and a minimal number of trainable parameters (329,863), surpassing previous techniques. Additionally, color space transformations are evaluated across three different datasets to assess their impact on model performance. These advantages underscore the method's suitability for histopathology image a

关键词： Lung cancer

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Coupling angle vibration model and error suppression method for INS

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IEEE Sensors Journal 2025年第12期25卷 22729-22738页

作者： Yan, Lin Wang, Lei Ye, Jiangnan Beihang University School of Instrumentation Science and Opto-electronics Engineering Beijing100191 China

In order to avoid the decrease in navigation accuracy and damage to system brought by severe vibration, airborne, and missile-borne. Inertial Navigation System (INS) is often mounted with vibration isolators. However, if the elastic center of the vibration damping system does not coincide with the center of mass of the INS, when only linear vibration input is available, the introduction of the shock absorber will produce angular vibration, and angular vibration and linear vibration will be coupled, that is, coupled angular vibration will be generated, resulting in additional navigation errors. This paper aims at solving this problem for a rotational INS (RINS). Firstly, to theoretically analyze the cause of coupled angular vibration, the six degree of freedom coupled angular vibration model of INS is derived. We also analyze the relationship between the misalignment angle of vibration isolators and vertical angular vibration. Secondly, a vibration suppression method for RINS is proposed. We use the angular velocity measured by the gyro as feedback to control the rotational gimbals of RINS to isolate the coupled angular motion. Experimental results show that the velocity oscillation of RINS caused by the vibration is greatly suppressed and thus proves the validity of the proposed method. © 2001-2012 IEEE.

关键词： Inertial navigation systems

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High resolution beam-forming for wide-band LFM chirps using super nested arrays

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Sadhana - Academy Proceedings in engineering Sciences 2025年第2期50卷 1-11页

作者： Sreekumar, G. Kunampilavu, Sanjana Shaju Vani Lakshmi, V. Thomas, Sneha Palakunnal Reji, Rebecca Elizabeth Sreekumar, Shyama Department of Applied Electronics and Instrumentation Engineering Rajagiri School of Engineering and Technology Kerala Kochi India Department of Electronics and Communication Engineering Rajagiri School of Engineering and Technology Kerala Kochi India

In sensor array processing mutual coupling between sensors makes it difficult for estimation of parameters such as directions of arrival (DoA), resolution etc. Non-uniform sparse linear arrays have several advantages over conventional uniform linear arrays particularly in terms of reduced mutual coupling, better degrees of freedom, improved resolution, and enhanced target detection. However, it is crucial to validate the effectiveness of these array configurations using non-stationary signals like a chirp. This is because natural signals and signals employed in radar, sonar, and imaging systems demonstrate non-stationary characteristics. Chirp signals employed in passive and active systems of sonars and radars provide good noise immunity at the receiver and better range resolution. This paper explores beam-forming in the context of DoA estimation for linear frequency modulated (LFM) chirp signals using super nested arrays, by taking into account the effect of mutual coupling. Also, the performance of super nested arrays on signal detection, resolution and accuracy is compared using other popular sparse array configurations viz. co-prime and nested arrays. It is seen from the computer simulations that super nested arrays excels other non-uniform sparse arrays in terms of resolution and accuracy, intercepting LFM chirp signals. Also the development of steering vector based on fractional Fourier transform, corresponding to the center frequency of the chirp had demonstrated performance supremacy of DoA estimation algorithms over conventional Fourier transform method. © Indian Academy of Sciences 2025.

关键词： Chirp modulation

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A Novel Method for Power Theft Detection Using PLC and GOT and Cyber Physical Attack Protection System 2

A Novel Method for Power Theft Detection Using PLC and GOT a...

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2nd International Conference on Recent Trends in Microelectronics, Automation, Computing, and Communications Systems, ICMACC 2024

作者： Subhadra, Harivardhagini Vakiti, Sreelatha Reddy Electronics & Instrumentation Engineering Hyderabad India

ISBN: (纸本)9798350366570

Programmable Logic Controllers (PLCs) have significantly advanced industrial automation by replacing traditional computing systems. A comprehensive approach is proposed for securing critical power systems through a Power Theft Detection and Cyber-Physical Attack Protection System that employs PLCs and Graphical Operator Terminals (GOTs). As power grids increasingly integrate with SCADA systems, the vulnerabilities of unauthorized access, power theft, and cyber-physical attacks become more pronounced. Our system addresses these challenges by continuously monitoring power grid data in real-time using PLCs, incorporating robust encryption, and promptly responding to potential threats. The integration of PLCs and GOTs provides operators with a user-friendly interface, thereby enhancing the protection of modern power distribution networks against cyber threats and power theft. Traditional methods of power theft detection, such as manual inspections orbasic metering techniques, are vulnerable to manipulation and evasion. In contrast, our solution leverages PLCs for real-time monitoring of power consumption patterns and deviations, enabling early detection of suspicious activities indicative of power theft. The inclusion of a Graphical Operator Terminal facilitates intuitive visualization and control of the detection system, while the integration of cyber-physical attack protection mechanisms ensures the system's resilience against malicious intrusions and manipulations. © 2024 IEEE.

关键词： SCADA systems

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A Novel Molecularly Imprinted 4-Vinyl Pyridine Electrode for Detection and Quantification of Cinnamic Acid in Food Samples

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IEEE Sensors Journal 2025年第12期25卷 21085-21092页

作者： Bhattacharjee, Ipshita Firdoushi, Shreya Dasgupta, Samhita Ahmed, A.H.M. Toufique Biswas, Don Ghorai, Santanu Tudu, Bhimsen Chatterjee, Arpitam Bandyopadhyay, Rajib Tudu, Bipan Jadavpur University Department of Instrumentation and Electronics Engineering Kolkata700106 India Aliah University Department of Electronics and Communication Engineering Kolkata700160 India HNB Garhwal University Instrumentation Engineering Garhwal Srinagar246174 India Heritage Institute of Technology Department of Applied Electronics and Instrumentation Engineering Kol 700107 India Jadavpur University Department of Power Engineering Kol 700106 India Jadavpur University Department of Printing Engineering Kol 700106 India

Cinnamic acid (CA) is a key intermediate in the biosynthesis of various plant metabolites and is widely present in food products such as tea, cinnamon, and fruits. It also possesses several pharmacological benefits, including antioxidant, anti-inflammatory, antibacterial, and anticancer properties. However, excessive or unregulated intake of CA can have adverse health effects, necessitating precise and reliable detection methods. In this study, a 4-Vinyl Pyridine polymerized graphite electrode (4-VP@G) has been fabricated to detect and quantify the Cinnamic acid (CA) in black tea and cinnamon powder samples. The molecularly imprinted polymer (MIP) material was synthesized using 4-Vinyl Pyridine (4-VP) as the monomer, and ethylene glycol dimethacrylate (EGDMA) as cross-linker in graphite bed. The synthesized material was characterized using Ultra Violet-Visible (UV-Vis) spectroscopy and scanning electron microscopy (SEM) techniques. The analytical performance of the fabricated electrode was evaluated by 3-electrode configuration using cyclic voltammetry (CV) as well as differential pulse voltammetry (DPV). The fabricated electrode (4-VP@G) has shown a wide range of linearity from 1 μM to 1000 μM with a limit of detection (LOD) of 8.2 nM. The electrode shows satisfactory repeatability, reproducibility and stability properties with relative standard deviation (RSD) values of 1.01%, 1.14% and 1.013%, respectively. Furthermore, to assess the performance of the developed electrode in real samples- three black tea and two cinnamon powder samples were experimented. To detect CA in comparison with the high-performance liquid chromatography (HPLC), the MIP electrode showed satisfactory results (94% ~ 98%) when used with real samples. Moreover, from the t-test, calculated statistical data were satisfactory for CA concentration present in real samples. © 2001-2012 IEEE.

关键词： High performance liquid chromatography

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Enhancing Pulmonary Embolism Segmentation Through Optimized SwinUnet with Resnet 152

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Journal of The Institution of Engineers (India): Series B 2024年 1-9页

作者： Mulam, Harikrishna Chikati, Venkata Rambabu Kulkarni, Anita Electronics and Instrumentation Engineering VNR Vignana Jyothi Institute of Engineering & ampTechnology Telangana Hyderabad500090 India

Pulmonary embolism arises when blood clots migrate to the lungs. The fusion of computer vision and deep learning enhances diagnostic capabilities, supporting medical research goals of reducing mortality rates, optimizing healthcare costs, and improving treatment outcomes. Despite progress, challenges persist in accurately segmenting pulmonary embolism, with current methods prone to underfitting and overfitting issues. To address these challenges, this research introduces an innovative approach to enhance pulmonary embolism segmentation. By leveraging the Radiological Society of North America Society of Thoracic Radiology (RSNA STR) pulmonary embolism detection dataset, strategically employ Color Wiener Filtering (CWF) to enhance image quality during preprocessing. The SwinUNet model, with its Swin Transformers attention mechanism, generates detailed segmentation crucial for accuracy. The hybrid SwinUNet with ResNet 152 (SURN-152) combines features, especially beneficial for intricate details in pulmonary embolism. Kepler optimization fine-tunes SURN-152 parameters, significantly improving segmentation capabilities. Evaluation metrics, including precision of 99.33%, accuracy of 99.95%, recall of 99.66% and specificity of 99.12%, ensure robust validation using Python, providing insights into segmentation accuracy. © The Institution of Engineers (India) 2024.

关键词： Image segmentation

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Discrimination of Various Pine Essential Oils Using Alpha Terpineol Selective Quartz Crystal Microbalance Sensor

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Journal of The Institution of Engineers (India): Series B 2024年 1-7页

作者： Gangopadhyay, Deepam Kundu, Sumit Banerjee, Mahuya Bhattacharyya Nag, Shreya Roy, Runu Banerjee Department of Instrumentation and Electronics Engineering Jadavpur University Kolkata700106 India Department of Electronics and Communication Engineering Institute of Engineering and Management University of Engineering and Management Kolkata700160 India

This study presents a novel approach for the precise detection of alpha-terpineol (α-Te), a naturally occurring bioactive phytochemical found in fruits and plant-derived Pine essential oil. Renowned for its potential health benefits, including anti-inflammatory, antioxidant, and anti-cancer properties, α-Te demands a reliable, cost-effective, and real-time measurement technique. Addressing this need, an accurate α-Te detection method is proposed employing a Quartz Crystal Microbalance (QCM) with a heterogeneous functional polymer as the sensing layer. The developed sensor exhibited an expansive linear range of operation (5–600 ppm) with a lowest detection limit of 5.98 ppm, along with commendable repeatability and reproducibility. Sensitivity of the fabricated sensor towards α-Te was found to be 0.069 Hz/ppm with linear regression coefficient (R2) of 0.9831. The sensor’s potential to differentiate various pine essential oil samples based on α-Te content has been explored, and validated through Principal Component Analysis. This innovation holds promise for enhanced α-Te detection and classification of essential oils, showcasing the versatility of QCM-based sensing technology. © The Institution of Engineers (India) 2024.

关键词： Quartz

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Prediction and Regulation of Delamination at Flexible Film/Finite-Thickness-Substrate Structure Interfaces

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Acta Mechanica Solida Sinica 2024年第2期37卷 238-251页

作者： Yutang Zhou Yunlong Xu Haoran Gong Chenyu Wang Department of Engineering Mechanics Northwestern Polytechnical UniversityXi’an710072China School of Instrumentation Science and Opto-Electronics Engineering Beihang UniversityBeijing100191China

Regulating the surface instability of thin film/substrate structures has been successfully applied to prepare new ductile electronic ***,such electronic devices need to be subjected to external loads during operation,which can easily induce delamination of the thin-film electronic device from the *** study aims to investigate the instability characteristics of hard films on flexible substrate surfaces from theoretical analysis and numerical simulation *** finite-thickness substrates,this paper establishes theoretical models for pure bending,bent wrinkle,partial delamination,and total delamination buckling of film/substrate structures based on the nonlinear Euler–Bernoulli beam theory and the principle of minimum energy;then the effects of material and geometric parameters of the structure,interfacial adhesion strength,and pre-strain on the evolutionary path of the four patterns are *** study results show that:the greater Young’s modulus of the substrate is,the larger the parameter region where partial delamination of the film/substrate structure occurs,and the smaller the parameter region where bent wrinkle *** varying Young’s modulus,thickness of the film and substrate,interfacial adhesion coefficient,and pre-strain,the buckling pattern of the structure can be predicted and *** parametric design intervals for each pattern are summarized in the phase *** results of this paper provide theoretical support for the design and reliability evaluation of flexible electronic devices.

关键词： Thin film/finite-thickness-substrate structure Delamination Surface instability Pattern evolution

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A novel temperature-compensation method based on correlation analysis for multi-FOG INS

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Chinese Journal of Aeronautics 2023年第6期36卷 279-287页

作者： Longjie TIAN Yanxiong NIU Chenwei HUANG Haoyang LI Yang PANG Yanqiang YANG Institute of Optics and Electronics School of Instrumentation Science and Optoelectronics EngineeringBeihang UniversityBeijing 100191China

Aimed at improving the bias stability of Fiber-Optic Gyroscope(FOG)-based inertial navigation systems in environments of various ambient temperatures,a novel temperaturecompensation method based on a correlation analysis of the same batch of FOGs is *** empirical mode decomposition method was employed to filter the high-frequency noises of the ***,the correlation information of the multiple FOGs was used to analyze the feasibility of the ***,the same residual error of the FOGs was compensated via the simple piecewise linear *** experimental results indicate that excellent compensation effects for both high-and low-accuracy FOGs are achieved using the proposed ***,the accuracies of high-accuracy FOGs are improved by approximately 33.9%,20%,and 31.2%,while those of low-accuracy FOGs are improved by approximately 39.1%,20.8%,and 26.1%.The method exhibits the merits of simplicity,validity,and stability,and thus is expected to be widely used in engineering applications.

关键词： Correlation methods Empirical mode decomposition Inertial navigation systems Temperature Fiber-Optic Gyroscope(FOG)

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