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检索条件"机构=Department of Measurement Engineering and Sensor Technology"

共 102 条记录，以下是1-10 订阅

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Analytical Description of Transversally Symmetric Hinges with Semicircular Contours 16th

Analytical Description of Transversally Symmetric Hinges wi...

引用

16th International Federation of Theory of Machines and Mechanisms World Congress, IFToMM WC 2023

作者： Jahn, Hannes Fröhlich, Thomas Zentner, Lena TU Ilmenau Department of Mechanical Engineering Mechanics of Compliant Systems Group Ilmenau98693 Germany TU Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Ilmenau98693 Germany

ISBN: (纸本)9783031457081

Compliant mechanisms are becoming increasingly important, especially in force measurement and weighing technology, due to their zero backlash, wear resistance, and zero friction. Their deformation under external forces can be analyzed well with analytical calculations and FEM simulations. Analytically, only mechanisms with symmetrical and longitudinally symmetrical hinges are described. This paper presents a method that allows transversally symmetric hinges to be described analytically. The model must be computed numerically due to the built neutral fiber and the nonlinearities in the used calculation method. The developed method is then compared with FEM calculations in a parameter study and considered to be validated. Finally, outlooks are formulated on how the created method can for instance be used to develop load cells for later calculations. Moreover, it is shown to what extent it is possible to implement this method for general calculations of compliant mechanisms. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Hinges

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CENTRE OF GRAVITY MEASURING DEVICE 24

CENTRE OF GRAVITY MEASURING DEVICE

引用

24th IMEKO TC3 Conference on measurement of Force, Mass and Torque 2022, Together with the 14th TC5 Conference on the measurement of Hardness, the 6th TC16 Conference on Pressure and Vacuum measurement, and the 5th TC22 Conference on Vibration measurement

作者： Pabst, M. Fröhlich, T. Technical University of Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Process Measurement Technology Group Ilmenau Germany

ISBN: (纸本)9781713870203

This paper describes a new method to measure the height of the centre of gravity of high-sensitive mass artefacts. A measuring device is presented and tested with mass samples of various shapes and densities. The results of the measurements are compared to the geometrical estimated heights of the centre of gravity and further developments of the new instrument are presented. © 2023 *** All Rights Reserved.

关键词： Comparators (optical)

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Investigating the kinematic performance of a positioning device with subatomic resolution 23

Investigating the kinematic performance of a positioning dev...

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23rd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2023

作者： Hebenstreit, Roman Oertel, Erik Thier, Daniel Manske, Eberhard Theska, René Technische Universität Ilmenau Department of Mechanical Engineering Institute for Design and Precision Engineering Precision Engineering Group Germany Technische Universität Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Germany

ISBN: (纸本)9781998999132

This paper is a follow-up to the conceptual design [1] and the prototype introduction [2] of a linear positioning device with subatomic resolution. This device is designed as a monolithic system. The linear guiding is realized by a mechanism with concentrated compliances. The position measurement is performed by tip-based scanning of the surface of a scale fixed at the moving table. Considering this setup, it becomes clear that the strongest sensitivity for kinematic deviations exists for displacements collinear to the probing axis of the tip as well as corresponding tilting motions. Deviations from an ideal straight guiding axis are mainly a result of manufacturing-related geometric deviations in the guiding mechanism. These error motions are investigated and characterised for prototype devices using an optical focus sensor in combination with a nanomeasuring machine NMM-1. To distinguish dynamic influences and static contributions to error motion, a quasi-static sequence of varying positions of the system has been performed during the measurement procedure. The determined error motions are highly reproducible due to the monolithic design from monocrystalline silicon. Consequently, the systematic error contribution of manufacturing deviations to the kinematic accuracy of the positioning device can be subsequently corrected. © 2023 Euspen Headquarters.

关键词： Compliant mechanisms

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Vulnerabilities and Challenges in the Development of PUF-Based Authentication Protocols on FPGAs: A Brief Review 7

Vulnerabilities and Challenges in the Development of PUF-Bas...

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7th IEEE Conference on Dependable and Secure Computing, DSC 2024

作者： Yavuz, Sinan Naroska, Edwin Daniel, Kai University of Siegen Department of Electrical Engineering and Computer Science Siegen Germany Niederrhein University of Applied Sciences Department of Electrical Engineering and Computer Science Krefeld Germany Institute of Measurement and Sensor Technology University of Applied Sciences Ruhr West Mülheim Germany

ISBN: (纸本)9798331540289

The security of IoT (Internet of Things) devices and the protection of sensitive information processed by these devices such as personal data, sensor values, process-related information is an important and difficult challenge. A major task in IoT communication is secure identification of devices. Unfortunately, traditional cryptographic methods are often not suitable for IoT devices due to their limited hardware resources. However, typical methods are computationally intensive, require a large amount of memory, and have a high-power consumption. On the other hand, Physical Unclonable Functions (PUFs) are low-cost and lightweight hardware-based primitives that can be used as a security component to protect data against third parties and thus increase security of a device. In this paper, the challenges and vulnerabilities in the development of PUF-based authentication protocols are presented. To this end, a security analysis of different approaches known from literature are discussed. Furthermore, possible attack vectors and prevention techniques are also considered. © 2024 IEEE.

关键词： Authentication Protocol

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Comparative Study of Transmitter and Resonator Coils for Wireless Power Transfer 19

Comparative Study of Transmitter and Resonator Coils for Wir...

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19th IEEE International Multi-Conference on Systems, Signals and Devices, SSD 2022

作者： Adawy, Abdallah Bouattour, Ghada Ibbini, Mohammed Kanoun, Olfa Chemnitz University of Technology Electrical Engineering and Information Technology Department Chemnitz Germany Chemnitz University of Technology Chair Measurement and Sensor Technology Chemnitz Germany

ISBN: (数字)9781665471084

ISBN: (纸本)9781665471084

Multi-coil wireless power transfer WPT systems have a lot of benefits compared to single coil WPT systems in the terms of power capacity, power transfer efficiency, and free position. In this paper, a comparative study of two different types of multi-coil WPT systems is proposed. The first system contains three transmitter coils on the primary side, while the other system contains one transmitter coil and two resonator coils. Both multi-coil WPT systems are studied in three different cases. The resonator coils lead to higher output power in addition to system efficiency when the receiver has misalignment with transmitter coils. When the receiver coil is aligned with the transmitter coil, resonator coils can decrease the output power and power transfer efficiency. The multi-coil WPT systems are working at a frequency of 6.78 MHz. Resonator coils are also designed under the operating resonance frequency. © 2022 IEEE.

关键词： Inductive power transmission

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Features Selection for Force Myography Based Hand Gesture Recognition

Features Selection for Force Myography Based Hand Gesture Re...

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2023 IEEE Jordan International Joint Conference on Electrical engineering and Information technology, JEEIT 2023

作者： Fora, Malak Jaradat, Manar Atitallah, Bilel Ben Wu, Congyu Kanoun, Olfa State University of New York Department of Systems Science and Industrial Engineering Binghamton United States Technische Universität Chemnitz Professorship of Measurement and Sensor Technology Chemnitz Germany

ISBN: (纸本)9798350324051

Hand gesture recognition has a wide range of applications in robotics, game control, and in communication with the deaf and people with trouble hearing. Recognition of American sign language (ASL) hand gestures has been extensively studied in the literature. Multiple data sources and different features extracted from these data were used to classify ASL gestures. In this study, we examined the features used in previous research to determine the minimum number of features that can give an accurate classification of ASL hand gestures. Force myography (FMG) signals captured for ASL gestures of digits 0-9 were used in this analysis of the selected features. Extracted features from the raw FMG signals were applied to K-nearest neighbors (KNN) and Extreme Learning Machine (ELM) to evaluate their efficiency in identifying the corresponding hand gesture. Results show that using only the mean value as input to classification algorithms yields the highest classification accuracy. The classification accuracy was 90% and 96.9% for KNN and ELM, respectively. © 2023 IEEE.

关键词： Audition

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Automated Ortho- Planar Spring Design for Vibration Energy Harvesters

Automated Ortho- Planar Spring Design for Vibration Energy H...

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IEEE sensors Applications Symposium, SAS

作者： Tra Nguyen Phan Ye Xu Olfa Kanoun Bengt Oelmann Sebastian Bader Department of Computer and Electrical Engineering Mid Sweden University Sundsvall Sweden Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9798350369250

ISBN: (纸本)9798350369267

Energy harvesting has been proposed to support or replace battery-based energy supplies in low-power loT systems. However, manual design and optimization is currently required to implement energy harvesters. This implies significant time and cost requirements, reducing the competitiveness of energy harvesting solutions in many applications. In this paper, we propose and study a method for the automated design of ortho-planar springs in vibration energy harvesters. The proposed method uses a Python tool that has been developed to translate parametric descriptions of the spring into 2D and 3D spring CAD models. The tool is combined with a black-box optimization algorithm in order to identify optimized spring parameters. An evaluation of the proposed method on a case study of an electromagnetic vibration energy harvester demonstrates that the approach successfully results in spring designs that perform well in the energy harvesting application. Consequently, the requirement of expert competence to adjust an energy harvester to new application constraints is significantly reduced, contributing to the availability and competitiveness of energy harvesting solutions in real world applications.

关键词： Vibrations Solid modeling Three-dimensional displays Closed box Voltage Energy harvesting Springs

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A Polynomial Curve Fitting of Bioimpedance Data for Parameter Estimation of the Cole-Impedance Model 17

A Polynomial Curve Fitting of Bioimpedance Data for Paramete...

引用

17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Simic, Mitar Freeborn, Todd J. Seoane, Fernando Kanoun, Olfa University of Novi Sad Faculty of Technical Sciences Novi Sad21000 Serbia University of Alabama Department of Electrical and Computer Engineering TuscaloosaAL35401 United States Karolinska University Hospital Department of Clinical Physiology Stockholm17176 Sweden Karolinska University Hospital Department of Medical Technology Stockholm17176 Sweden University of Borås Department of Textile Technology Borås50190 Sweden Chemnitz University of Technology Measurement and Sensor Technology Chemnitz09126 Germany

ISBN: (纸本)9798331507626

The rapid advancements in technology have led to a significant increase in the number of portable and wearable devices, driving the demand for efficient and reliable methods for bioimpedance analysis suitable for compact embedded-hardware platforms. In this paper, a method for complex bioimpedance curve fitting with the second order polynomial is derived and validated with synthetic datasets as well as experimentally obtained bioimpedance. The main advantages are independence of the frequency data (which results in reduction of the dataset by 1/3), and the elimination of dependence on characteristic frequency estimation. More importantly, it is possible to estimate parameters of the Cole-impedance model (R∞, R1 and a) from obtained polynomial coefficients in a very efficient micro controller-based realization. Raspberry Pi Pico-based execution time was around 9 ms for 256 datapoints, which is more than 1000 times shorter when compared to the relevant references. Moreover, here presented method required 22.05% less flash memory and 43.64% less SRAM. Experimental bioimpedance of human volunteer was obtained using the ImpediMed SFB7 device. Relative deviations of the estimated values of the Cole-impedance model with the proposed method and BioImp software were around 5%. The proposed method's suitability for applications involving portable and cost-effective bioimpedance measurement and processing units was demonstrated by achieving a mean relative deviation of less than 2% between the fitted and measured bioimpedance of pear slices over a three-hour period. © 2024 IEEE.

关键词： Frequency estimation

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Enhanced Dielectric and Mechanical Properties of PVDF-HFP/Zn-BCZT Composite 19

Enhanced Dielectric and Mechanical Properties of PVDF-HFP/Zn...

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19th IEEE International Multi-Conference on Systems, Signals and Devices, SSD 2022

作者： Ayed, Amina Ben Bouhamed, Ayda Abdelmoula, Najmeddine Khemakhem, Hamadi Kanoun, Olfa Faculty of Sciences of Sfax University of Sfax Laboratory of Multifunctional Materials and Application Sfax Tunisia Professorship of Measurement and Sensor Technology Chemnitz Germany Department of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9781665471084

ISBN: (纸本)9781665471084

The use of flexible and environmentally friendly materials to replace lead materials-based energy harvesters could lead to a big breakthrough in wearable electronics. Polymeric composites including organic polymer and inorganic nanoparticles are suitable candidates. To this aim, lead-free Zinc doped Ba0.85Ca0.15Zr0.10Ti0.90O3 (Zn-BCZT) nanoparticles were produced using a sol-gel technique and embedded into a polymer matrix (PVDF-HFP) (poly(vinylidene fluoride cohexafluoropropylene) via solution casting process in N, N-dimethylformamide (DMF) solvent with different ratio in order to enhance their electrical, and mechanical properties. The results illustrate that the real part of permittivity increased as a function of solvent volume and the tangent loss tends to increase. The Young's modulus is increased with the addition of solvent from 226 to 319 MPa and tensile strength increased from 13.5 to 17.5 MPa as well. The improved tensile were may attributed to the uniform dispersion and good interfacial interaction between PVDF-HFP polymer and Zn-BCZT particles. The findings show that solvent has an influence on the modification of dielectric and mechanical characteristics. © 2022 IEEE.

关键词： Dimethylformamide

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Simulation Study of Surface Acoustic Wave sensors for Soil Parameter Monitoring

Simulation Study of Surface Acoustic Wave Sensors for Soil P...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Zhenyu Wu Tianqi Lu Ammar Al-Hamry Anurag Adiraju Ge Shi Siqi Liu Swaranpreet Kaur Surinder Singh Olfa Kanoun Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany Department of Physics Sant Longowal Institute of Engineering & Technology Longowal Sangrur Punjab India Department of Electronics and Communication Engineering Sant Longowal Institute of Engineering & Technology Longowal Sangrur Punjab India

ISBN: (数字)9798331542726

ISBN: (纸本)9798331542733

Soil parameters such as moisture, pH, and salinity are essential for agricultural productivity and environmental management. However, traditional monitoring methods, while accurate, are time-consuming and lack real-time capabilities, limiting their suitability for precision agriculture. Surface acoustic wave (SAW) sensors offer a promising alternative due to their high sensitivity, robustness, and real-time monitoring capabilities. In this study, a SAW sensor was designed and simulated using COMSOL Multiphysics to detect soil moisture. The sensor design employs a lithium tantalate piezoelectric substrate and interdigitated transducers (IDTs), with graphene oxide (GO) as a functional coating to enhance sensitivity. Simulation results showed that at a GO coating thickness of 350 nm, the sensor achieved the highest frequency shift at 70% relative humidity, demonstrating optimal sensitivity. Additionally, dynamic response analysis revealed that as humidity increased from 0% to 100%, the response time grew nonlinearly from 2.5 seconds to 42.2 seconds. The simulation results of the nonlinear growth trend of the optimal coating thickness and response time provide a clear direction for practical humidity sensor design optimization, dynamic environmental adaptation analysis, and future experimental validation and development. This study provides a theoretical foundation for the development of SAW-based soil sensors and outlines future directions for expanding functionality to monitor pH and salinity. Future work will focus on transitioning to 3D FEM models, experimental validation, and advanced material development. Fabricating actual sensors and validating simulations with experimental data will ensure reliability, supporting the broader application of SAW sensors in precision agriculture and environmental management.

关键词： Temperature sensors Precision agriculture Solid modeling Sensitivity Simulation Surface acoustic waves Humidity sensors Finite element analysis Monitoring

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