Sunil Kumar’s Post

#Article 📜 Experimental Validation of a Permanent Magnets Magnetorheological Device under a Standardized Worldwide Harmonized Light-Duty Test Cycle by Claudia Simonelli, Luca Sani, Nicolò Gori, Miguel Fernández-Muñoz, Antonino Musolino and Rocco Rizzo 🔗 https://lnkd.in/g3u3RmKU MDPI; Università di Pisa; Universidad de Alcalá #magnetorheologicalfluids #permanentmagnets #MRFclutch #vacuumpump #Abstract In this paper, the experimental validation of an innovative clutch based on magnetorheological fluids (MRFs) excited by permanent magnets is described. The device, used in automotive applications to engage and disengage the vacuum pump, is tested using a standardized Worldwide harmonized Light-duty Test Cycle (WLTC). A test bench is built, and the system is observed in its operation for one hour, considering two consecutive WLTCs. The temperature increase slightly impacts the clutch’s behavior; in particular, the on-state performance of the device, mainly determined by the magnetic field-induced torque, remains largely unaffected by the temperature increase. The results showed that the performance of the proposed MRF-based device is only marginally affected by the phenomena that take place during the actual operation (e.g., temperature increase, shaft slip), confirming the effectiveness of the design.

📢 📢 📢 Non-Destructive Testing of Carbon Fiber-Reinforced Plastics (CFRPs) Using a Resonant Eddy Current Sensor 🧑🔬 Ming Ma, Shiyu Liu, Ronghua Zhang, Qiong Zhang, Yi Wu, and Bailiang Chen 🏫 Tiangong University 💥 #Eddy #current #testing (#ECT) is commonly used for the detection of defects inside metallic materials. In order to achieve the effective testing of CFRP materials, increasing the operating frequency or improving the coil structure is a common method used by researchers. Higher or wider operating frequencies make the design of the ADC’s conditioning circuit complex and difficult to miniaturize. In this paper, an #LC #resonator based on inductance-to-digital converters (LDCs) is designed to easily detect the resonant frequency response to the state of the material under test. The reasonableness of the coil design is proven by simulation. The high signal-to-noise ratio (SNR) and detection sensitivity of the LC resonator are demonstrated through comparison experiments involving multiple probes. The #anti-interference capability of the LC resonator in CFRP #defect #detection is demonstrated through various interference experiments. https://lnkd.in/g-hdF2mC

SiC has a wide bandgap and excellent thermal and electrical properties, making it increasingly used in power devices. However, compared to Si devices, SiC faces the challenge of having more defects. Non-destructive defect analysis of SiC wafers is a critical technology for ensuring mass production quality. Among these methods, polarized light observation has gained attention. This non-destructive technique visualizes various defects such as TSD, TED, and BPD, which can significantly impact device performance and reliability, and analyzes stress fields induced in the SiC crystal structure. I would like to introduce a clear and informative paper outlining advancements in defect characterization of SiC wafers using polarized light observation. The study suggests that combining polarized light observation with X-ray topography enables detailed evaluation of threading dislocations. https://lnkd.in/gbvhMaAj

🚀 𝐈𝐧𝐭𝐫𝐨𝐝𝐮𝐜𝐢𝐧𝐠 𝐭𝐡𝐞 𝐒𝐂𝐈 𝐒𝐞𝐫𝐢𝐞𝐬: 𝐏𝐫𝐞𝐜𝐢𝐬𝐢𝐨𝐧 𝐑𝐞𝐝𝐞𝐟𝐢𝐧𝐞𝐝 Our latest SCI Series spectral confocal sensors are setting a new benchmark in measurement technology. Designed for speed, accuracy, and versatility, they tackle the toughest industrial challenges with ease. 🌟 What sets the SCI Series apart? 1️⃣ Record-Breaking Speed: Achieving 𝟑𝟑 𝐤𝐇𝐳 𝐬𝐚𝐦𝐩𝐥𝐢𝐧𝐠 𝐫𝐚𝐭𝐞, it’s perfect for dynamic environments requiring real-time precision. 2️⃣ Material Versatility: From shiny metals to transparent glass, no surface is too difficult. 3️⃣ Unmatched Accuracy: Linear precision of ±𝟎.𝟐 μ𝐦, ideal for applications like thin films or electrode analysis. 4️⃣ Integration-Ready: Smooth compatibility with multi-axis systems enables advanced setups. 5️⃣ Harsh Conditions? No Problem: Durable and thermally stable, it performs flawlessly under fluctuating temperatures. 🎯 Applications: ✅Medical Glass Bottle Thickness Detection ✅PCB Quality Control ✅Solar Panel Clearance Analysis ✅Curved Glass Surface Precision Ready to experience the future of measurement? Let’s redefine your production process. 📩 Contact us to learn more or schedule a demo today! Email: info@cnsszn.com

#Article 📜 Non-Inchworm Electrostatic Cooperative Micro-Stepper-Actuator Systems with Long Stroke by Lisa Schmitt, Peter Conrad, Alexander Kopp, Christoph Ament and Martin Hoffmann 🔗 https://lnkd.in/gU9vA2tn MDPI; Ruhr University Bochum; University of Augsburg #actuators #longstroke #stepperactuators #EWOD #digitalmicrofluidics #Abstract In this paper, we present different microelectromechanical systems based on electrostatic actuators, and demonstrate their capacity to achieve large and stepwise displacements using a cooperative function of the actuators themselves. To explore this, we introduced micro-stepper actuators to our experimental systems, both with and without a guiding spring mechanism; mechanisms with such guiding springs can be applied to comb-drive and parallel-plate actuators. Our focus was on comparing various guiding spring designs, so as to increase the actuator displacement. In addition, we present systems based on cascaded actuators; these are converted to micromechanical digital-to-analog converters (DAC). With DACs, the number of actuators (and thus the complexity of the digital control) are significantly reduced in comparison to analog stepper-actuators. We also discuss systems that can achieve even larger displacements by using droplet-based bearings placed on an array of aluminum electrodes, rather than guiding springs. By commutating the voltages within these electrode arrays, the droplets follow the activated electrodes, carrying platforms atop themselves as they do so. This process thus introduces new applications for springless large displacement stepper-actuators.

Fast, accurate, precise orientation of wafers, boules, and single crystalline samples? You can make it a reality with our crystal orientation range ✨ This range is based on azimuthal scan, a smart geometrical measurement technique to orient the crystal. With this technique, we can find not only the tilt of the main axis, but also all in-plain directions - in as little as 10 seconds. Plus, the instruments can measure any material, as long as its a single crystalline one 💎 They are designed to fit into manufacturing, research and quality control applications - so you can be sure you have the properties you need for your next process steps. Find out more: https://bit.ly/3XP5TTt #Semiconductors #CrystalOrientation #Innovation

#Article 📜 Multi-Objective Optimal Design of μ–Controller for Active Magnetic Bearing in High-Speed Motor by Yuanwen Li and Changsheng Zhu 🔗 https://lnkd.in/drNJM5Af MDPI; Zhejiang University #activemagneticbearing #gyroscopiceffect #multiobjectiveoptimization #Abstract In this paper, a control strategy based on the inverse system decoupling method and μ-synthesis is proposed to control vibration in a rigid rotor system with active magnetic bearings that are built into high-speed motors. First, the decoupling method is used to decouple the four-degrees-of-freedom state equation of the electromagnetic bearing rigid rotor system; the strongly coupled and nonlinear rotor system is thus decoupled into four independent subsystems, and the eigenvalues of the subsystems are then configured. The uncertain parametric perturbation method is used to model the subsystem, and the multi-objective ant colony algorithm is then used to optimize the sensitivity function and the pole positions to obtain the optimal μ-controller. The closed-loop system thus has the fastest possible response, the strongest internal stability, and the best disturbance rejection capability. Then, the unbalanced force compensation algorithm is used to compensate for the high-frequency eccentric vibration; this algorithm can attenuate the unbalanced eccentric vibration of the rotor to the greatest extent and improve the robust stability of the rotor system. Finally, simulations and experiments show that the proposed control strategy can allow the rotor to be suspended stably and suppress its low-frequency and high-frequency vibrations effectively, providing excellent internal and external stability.

A thermocouple is a device that utilizes the Seebeck Effect, which generates a voltage proportional to the temperature difference between two dissimilar metal junctions. This temperature-dependent voltage enables thermocouples to measure temperatures with precision, making them essential in industrial, scientific, and engineering applications. #Thermocouple #SeebeckEffect #TemperatureMeasurement #IndustrialApplications #EngineeringTools #ScientificInstruments #PrecisionMeasurement #ThermoelectricDevices #HeatMonitoring #EngineeringInnovation

Happy to share that the journal paper submitted to journal of ocean engineering few months ago got accepted for publication after the peer review process with insightful comments to improve the paper quality. It will be published in couple of weeks. The detailed discussion was made  on frequency domain analysis of vortex induced vibration of cantilever cylinder subjected to uniform flow using two-way-fluid-structure-CFD approach. The capable of capturing the mode transition process was discussed. #VIV #Vortex-induced-vibration

We’ve just published a paper that delves into an important question: How does the thickness of ALD coatings influence the surface of electrode materials and their electrochemical properties? Our study demonstrates that the thickness of ALD coatings is crucial in determining the surface characteristics of electrode materials. This has significant implications for Li diffusion during cycling, directly affecting volume changes and surface mechanical properties. These insights are vital for optimizing battery performance and longevity. I am deeply grateful to my supervisor, Prof. Tanja Kallio, and my advisor, Prof. Ville Miikkulainen, as well as Dr. Miia Mäntymäki, for their unwavering support and guidance. Special thanks to Prof. Simo Huotari and all our co-authors and collaborators for their invaluable contributions. Explore our full paper to uncover the potential of ALD technology in advancing electrochemical applications: https://lnkd.in/db7JwwHK #Chemistry #Electrochemistry #ALD #BatteryTechnology #Sustainability