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e-Journal of Nondestructive Testing 2024年第7期29卷

作者： Raorane, Siddhesh Ambrozinski, Lukasz Stepinski, Tadeusz Packo, Pawel Department of Robotics and Mechatronics Faculty of Mechanical Engineering and Robotics AGH University of Science and Technology Krakow30-059 Poland

The employment of guided waves for structural health monitoring applications has attracted substantial attention in recent years. Piezoelectric transducers are frequently employed in these systems for elastic wave generation and acquisition. Their dynamic properties, i.e., direction-dependent frequency characteristics such as directivity patterns, are an important feature for designing a reliable monitoring strategy. Although analysis of the transducer directivity pattern can be performed using finite element models, these usually tend to be computationally very expensive, especially for parametric and optimization studies. In this paper, a semi-analytical framework is proposed that can predict the far-field directivity patterns of complex transducers of arbitrary shape and structure mounted on a substrate. The framework described in this paper integrates analytical far-field predictions with a local finite element model evaluating the traction field produced by the transducer. Consequently, the FE model accurately captures near-field responses, whereas the analytical component predicts the far-field responses. The implementation of this semi-analytical framework requires the development of analytical and numerical approaches. The former includes computation of dispersion curves of the inspected plate, the stress and displacement profiles of wave modes, and ultimately, the excitability relations, while the latter includes estimation of the traction field between the transducer and the plate using the FE model. Owing to the popularity of piezoelectric macro-fiber composite (MFC) transducers, in this paper, we apply the proposed method to predict the directivity patterns of MFC M2807-P2 transducer. To validate the reliability of the proposed method, the predicted patterns are compared with experimental results obtained using Laser Doppler Vibrometer. © 2024, NDT. net GmbH and Co. KG. All rights reserved.

关键词： Forecasting

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Towards backward compatibility of ADRC: revisiting classical state-feedback control with integral compensator

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Bulletin of the Polish Academy of sciences: Technical sciences 2025年第2期73卷

作者： Mrotek, Mikolaj Michalski, Jacek Madonski, Rafal Pazderski, Dariusz Retinger, Marek Faculty of Control Robotics and Electrical Engineering Institute of Robotics and Machine Intelligence Poznan University of Technology Piotrowo 3a Poznan60-965 Poland Faculty of Automatic Control Electronics and Computer Science Department of Automatic Control and Robotics Silesian University of Technology Akademicka 16 Gliwice44-100 Poland Faculty of Control Robotics and Electrical Engineering Institute of Automatic Control and Robotics Poznan University of Technology Piotrowo 3a Poznan60-965 Poland

In this paper, the problem of backward compatibility of active disturbance rejection control (ADRC) is investigated. The goal is to contextualize ADRC to deliver its interpretations from the established field of linear control systems. For this study, a control algorithm, denoted here as integral disturbance rejection control (IDRC), is considered that combines classical state-feedback control with an integral compensator. At first, an interpretation of ADRC is involved in terms of existing state-space control approaches. Next, a transition to the frequency domain is performed, which is justified as a significant part of practical control engineering is conducted in that domain. For assumed specific plant structures, both ADRC and IDRC are then holistically compared in terms of transfer function representation and frequency characteristics, as well as steady-state convergence conditions. Such a juxtaposition helps to highlight the similarities and differences of both approaches, whereas the utilized bandwidth parameterization is shown to bring the control system to the same form, thus indicating some interesting practical aspects. Finally, the theoretical results concerning both considered control structures are validated in a set of numerical simulations and experiments conducted on a laboratory hardware testbed. © 2025 The Author(s).

关键词： Disturbance rejection

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Non-contact Assessment of Cardiovascular and Thermoregulatory Function during Exercise after Sleep Deprivation 46

Non-contact Assessment of Cardiovascular and Thermoregulator...

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46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2024

作者： Fumimoto, Kanaru Okada, Shima Manno, Masanobu Sakaue, Yusuke Makikawa, Masaaki Ritsumeikan University Graduate School of Science and Engineering Shiga Japan Ritsumeikan University Faculty of Science and Engineering Department of Robotics Shiga Japan Ritsumeikan University Ritsumeikan Global Innovation Research Organization Shiga Japan Ritsumeikan University Research Organization of Science and Technology Shiga Japan

ISBN: (纸本)9798350371499

The number of deaths due to heat stroke has been increasing rapidly in recent years, and it is predicted that by 2050 there will be 2.5 times as many deaths as at present. One of the major causes of heat stroke is loss of autonomic nervous system activity. Autonomic nervous system activity is a function of thermoregulation as well as cardiovascular regulation. However, the only index mainly used to control body condition is the cardiovascular index centering on heart rate. In addition, a noncontact, easy-to-use measurement system is needed for daily physical condition management. The purpose of this study was to evaluate autonomic nervous system activity in terms of both cardiovascular and thermoregulatory functions. We also aimed to construct a system that can measure these functions in a noncontact manner. To observe the effects of autonomic nervous system dysfunction more clearly, the subjects were asked to exercise. We focused on cutaneous blood vessels, which are commonly involved in cardiovascular and thermoregulatory functions. For the measurement of skin blood vessels, we used an index called the G/B ratio, which we have been developing for some time. This system uses differences in light absorbance to extract the contraction and dilation characteristics of facial capillaries. As a validation experiment, an exercise task using a bicycle ergometer was performed. The exercise intensity was set at 40% and calculated using the Karvonen method. Two conditions were used: normal sleep (control) and sleep deprivation for more than 24 hours (SD) to create a state of autonomic inactivity. The following parameters were measured: heart rate, blood pressure, peripheral vascular resistance, and cardiac output as cardiovascular indices, and deep body temperature, skin temperature, and facial animation as thermoregulatory indices. The G/B ratio also showed different variations between the control and SD conditions. The G/B ratio also varied differently between the control a

关键词： Blood vessels

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Weisfeiler and Leman Go Loopy: A New Hierarchy for Graph Representational Learning 38

Weisfeiler and Leman Go Loopy: A New Hierarchy for Graph Rep...

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38th Conference on Neural Information Processing Systems, NeurIPS 2024

作者： Paolino, Raffaele Maskey, Sohir Welke, Pascal Kutyniok, Gitta Department of Mathematics LMU Munich Germany Germany Faculty of Computer Science TU Wien Austria Institute for Robotics and Mechatronics DLR-German Aerospace Center Germany Department of Physics and Technology University of Tromsø Norway

We introduce r-loopy Weisfeiler-Leman (r-`WL), a novel hierarchy of graph isomorphism tests and a corresponding GNN framework, r-`MPNN, that can count cycles up to length r+2. Most notably, we show that r-`WL can count homomorphisms of cactus graphs. This extends 1-WL, which can only count homomorphisms of trees and, in fact, we prove that r-`WL is incomparable to k-WL for any fixed k. We empirically validate the expressive and counting power of r-`MPNN on several synthetic datasets and demonstrate the scalability and strong performance on various real-world datasets, particularly on sparse graphs. Our code is available on GitHub. © 2024 Neural information processing systems foundation. All rights reserved.

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A survey on the visual perception of humanoid robot

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Biomimetic Intelligence & robotics 2025年第1期5卷 3-14页

作者： Teng Bin Hanming Yan Ning Wang Milutin N.Nikolić Jianming Yao Tianwei Zhang The Shenzhen Institute of Artificial Intelligence and Robotics for Society Shenzhen 518172China College of Intelligent Systems Science and Engineering Harbin Engineering UniversityHarbin 150001China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China College of Mechatronics Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Faculty of Technical Sciences University of Novi SadNovi Sad 21102Serbia Electronic science and technology Guangdong University of TechnologyGuangzhou 510006China

In recent years,humanoid robots have gained significant attention due to their potential to revolutionize various industries,from healthcare to manufacturing.A key factor driving this transformation is the advancement of visual perception systems,which are crucial for making humanoid robots more intelligent and *** the progress,the full potential of vision-based technologies in humanoid robots has yet to be fully *** review aims to provide a comprehensive overview of recent advancements in visual perception applied to humanoid robots,specifically focusing on applications in state estimation and environmental *** summarizing key developments and analyzing the challenges and opportunities in these areas,this paper seeks to inspire future research that can unlock new capabilities for humanoid robots,enabling them to better navigate complex environments,perform intricate tasks,and interact seamlessly with humans.

关键词： advanced technologies visual perception autonomous navigation human robot interaction environmental interaction state estimation humanoid robots advancement visual perception systemswhich

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Automated Ultrasonic Testing of Carbon-Carbon Composite Materials 7

Automated Ultrasonic Testing of Carbon-Carbon Composite Mate...

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7th International Conference on Information, Control, and Communication Technologies, ICCT 2023

作者： Pavlukhin, Evgeniy A. Kinzhagulov, Igor Y. Fedorov, Alexey V. Omarov, Magomed A. Itmo University Faculty of Control Systems and Robotics ST Petersburg Russia Inst. of Science 'Engineering and Design Center for Support of the Operation of Space Technology ST Petersburg Russia

ISBN: (纸本)9798350340945

The quality of products made of carbon-carbon composite materials (CCCM) is influenced by many factors, including the parameters of the technological process and the technical level of equipment for the manufacture of materials and structures. One of the most important moments in the process of creating products from CCCM is the formation of reinforcing components, matrix and their structural bonds. The efficiency of the system of structural bonds depends on the homogeneity (heterogeneity) of the material structure. The required mechanical and thermal properties of CCCM are ensured by the uniformity (continuity) of the structure, the change of which affects the properties of the material as a whole. In the event of discontinuity, an uneven distribution of mechanical and thermal fields can occur, which will jeopardize the performance of the entire structure, so non-destructive testing (NDT) of CCCM is an important task. The ultrasonic shadow method of control was chosen as the NDT method. This method makes it possible to detect structural inhomogeneities in the material of the test object - accumulations of pores and microcracks (at the microlevel), cracks, zones of low density, local heterogeneity of the structure (at the macrolevel). This article discusses the automation and ultrasonic testing of products from CCCM. © 2023 IEEE.

关键词： Nondestructive examination

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Extremely Weak Feedback Method for Controlling Chaotic Resonance

Extremely Weak Feedback Method for Controlling Chaotic Reson...

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2023 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2023

作者： Iinuma, Takahiro Ebato, Yudai Nobukawa, Sou Tran, Anh Tu Wagatsuma, Nobuhiko Inagaki, Keiichiro Doho, Hirotaka Yamanishi, Teruya Nishimura, Haruhiko Graduate School of Information and Computer Science Chiba Institute of Technology Chiba Japan Chiba Institute of Technology Department of Computer Science Japan Toho University Faculty of Science Department of Information Science Chiba Japan Chubu University Department of Artificial Intelligence and Robotics Aichi Japan Kouchi University Faculty of Education Teacher Training Division Kochi Japan Osaka Seikei University Faculty of Data Science Osaka Japan Yamato University Faculty of Informatics Osaka Japan

ISBN: (纸本)9798350337020

Chaotic resonance, resembling stochastic resonance, is induced by internal fluctuations (i.e., chaos). This phenomenon has been observed in numerous systems. The most representative form of chaotic resonance is the synchronization with respect to weak applied signals under chaos-chaos intermittency, where a chaotic orbit moves among multiple attractors. Chaotic resonance exhibits higher sensitivity than stochastic resonance, but its engineering applications are limited by concerns such as the requirement to adjust the state of chaos by internal system parameters to induce chaotic resonance rather than the external noise strength. However, achieving this adjustment is challenging, especially in biological systems. Therefore, to handle this limitation, we proposed a novel double-Gaussian-filtered reduced region of orbit (RRO) method (called the DG-RRO method) for obtaining perturbed feedback signals lower than the conventional RRO method. This DG-RRO feedback signal is determined by the inverse sign of the map function and double-Gaussian filters around the local maximum/minimum values of the map. Because of its fine local specification, the DG-RRO feedback signal induces a chaotic resonance by one-third the feedback strength of the conventional signal. This method may pave the way for using chaotic resonance in engineering applications. © 2023 IEEE.

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COMMUNICATION MANAGEMENT FOR THE ACQUISITION OF DATA BETWEEN THE PC AND A DEVICE CALLED THE HYDROELECTRIC TURBINE DEPLOYED LINEARLY ON THE COURSE OF FLOWING WATER

International Journal of Mechatronics and Applied Mechanics

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International Journal of Mechatronics and Applied Mechanics 2024年第17期2024卷 166-177页

作者： Țîțu, Aurel Mihail Bogorin-Predescu, Adrian Lucian Blaga University of Sibiu 10 Victoriei Street Sibiu Romania Academy of Romanian Scientists 3 Ilfov Street Bucharest050044 Romania National University of Science and Technology POLITEHNICA Bucharest Faculty of Industrial Engineering and Robotics Splaiul Independenţei no. 313 6th District Bucharest Romania

The present paper deals with the data communication between a computer and a hydroelectric renewable energy system called a Hydroelectric Turbine. The purpose of the communication is to obtain data from the turbine to diagnose how it is operating. In terms of physical data transport, the two points, which are composed of a computer and a turbine, communicate via radio frequency through two transceivers operating at the frequency of 433 MHz. One is on the turbine and the second is on an electronic system with a microcontroller. The microcontroller serves as an interface to transmit information from the computer's USB port to the turbine. The communication protocol is a request-response type, and the length of the data packet transmitted between the turbine and the computer is fixed. This paper outlines the internal communication processes from the software level of the microcontroller and the PC. These methods enable the PC and the turbine to establish half duplex connection for data acquisition. In the last section of the paper, the advantages, and results of using this type of communication are presented. © 2024, Cefin Publishing House. All rights reserved.

关键词： Microcontrollers

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Functional Analysis: A Case Study of an IoT-Based Health Monitoring System

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Macromolecular Symposia 2024年第3期413卷 2300207-2300207页

作者： Ulmeanu, Mihaela-Elena Doicin, Cristian-Vasile Dugăeșescu, Ileana Zaharia, Cristin Pârvu, Gabriela-Marina Faculty of Industrial Engineering and Robotics National University of Science and Technology POLITEHNICA Bucharest Splaiul Independentei 313 Bucharest Romania

This paper focuses on the application of technical functional analysis in the early development stages of an advanced Internet of Things (IoT) system designed for remote monitoring of patients' health parameters. The primary objective of this work is to enhance healthcare efficiency and accessibility, addressing the increasing demand for optimized medical services. Function identification is a pivotal aspect of this endeavor as it plays a crucial role in the successful development of the IoT system and often leads to the identification of competitive advantages. The methodology employed in this study involves identifying the basic need, together with the primary, secondary, and tertiary functions. These functions are then hierarchically organized, weighed, and assessed in both technical and economic dimensions. The cost–value relationship of the functions is analyzed using the least-squares method and an optimal concept framework for an advanced IoT system tailored for remote health parameter monitoring of patients is proposed. © 2024 Wiley-VCH GmbH.

关键词： Internet of things

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Dimensional and Weight Characterization of 3D Printed PET Specimens Designed for Compliant Mechanisms

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Macromolecular Symposia 2024年第3期413卷 2300194-2300194页

作者： Nicolescu, Alexandru-Ionut Hadăr, Anton Baciu, Florin Stochioiu, Constantin Ulmeanu, Mihaela-Elena Faculty of Industrial Engineering and Robotics National University of Science and Technology POLITEHNICA Bucharest Splaiul Independentei 313 Bucharest Romania

The paper presents a study on the dimensional and weight characterization of 3D printed polyethylene terephthalate specimens designed specifically for compliant mechanisms. Compliant mechanisms find applications in various industries, including medical, consumer goods, education, and research and development. Ensuring these mechanisms meet the required functional needs is crucial, particularly when customizing medical devices. The research focuses on material selection, a critical aspect for 3D printed compliant mechanisms. To investigate the influence of the material deposition angle on the quality and precision of 3D printing, the study considers traction and bending specimens. For each specimen type, three sets of five specimens are manufactured, incorporating different deposition angles: 0°, ±45°, and 90°. In total, 30 specimens are produced, labeled, weighted, and measured. The results reveal that specimens printed at a deposition angle of 45° exhibit the smallest dimensional and mass deviations, indicating higher precision and accuracy. Those printed at 0° follow closely in terms of deviation, while specimens printed at 90° display larger deviations. © 2024 Wiley-VCH GmbH.

关键词： 3D printing

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