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Imbalance fault detection in BLDC motors through audio signals using the density of maxima and CNN

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Imbalance fault detection in BLDC motors through audio signa...

Brazilian Symposium on Computing System engineering (SBESC)

作者： Yuri C. Gouveia Alisson V. Brito Tiago P. Nascimento Jorge Gabriel Ramos Abel Lima Filho Graduate Program in Informatics Universidade Federal da Paraiba Joao Pessoa Brazil Laboratory of System Engineering and Robotics Universidade Federal da Paraiba Joao Pessoa Brazil Department of Physics Universidade Federal da Paraiba Joao Pessoa Brazil Department of Mechanical Engineering Universidade Federal da Paraiba Joao Pessoa Brazil

Unmanned Aerial Vehicles (UAVs), commonly known as drones, are increasingly used for various tasks. However, increased usage leads to more failures, posing risks to humans and the environment. This study identifies propeller imbalance faults in Brushless DC (BLDC) motors of UAVs. It compares two fault detection methodologies based on chaotic behavior: the alreadyknown CNN approach, and the SAC-DM+CNN approach. Both methods involve acquiring audio signals, generating spectrograms, and training a Convolutional Neural Network (CNN) model. Results show that the CNN approach achieves 98.18% accuracy, while the SAC-DM+CNN approach achieves 71.43% accuracy in classifying propeller balance faults.

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Synthetic helicoidal rotation of a quasielectrostatic ring resonator for ultrabroadband magnet-free nonreciprocity

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Physical Review Applied 2024年第6期22卷 064020-064020页

作者： Aravind Nagulu Ahmed Mekawy Mykhailo Tymchenko Dimitrios Sounas Harish Krishnaswamy Andrea Alù Department of Electrical and Systems Engineering Washington University in St. Louis St. Louis Missouri 63130 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Department of Electrical Engineering Wayne State University Detroit Michigan 48202 USA Department of Electrical Engineering Columbia University New York New York 10027 USA Physics Program Graduate Center City University of New York New York New York 10016 USA

Suitably tailored forms of spatiotemporal modulation in electronic circuit networks have been recently employed to overcome fundamental challenges in modern electronic systems, including breaking reciprocity, squeezing the footprint of high-Q resonators, and overcoming the delay-bandwidth limit. Rotating patterns of temporal modulations have been used to synthesize angular momentum, which replaces magnetic bias to break reciprocity in integrated circuits. However, this approach is limited by trade-offs between modulation speed, footprint, and bandwidth of operation. Rotating switching patterns in commutated capacitor networks also enables compact filters and quasielectrostatic wave propagation, overcoming the delay-bandwidth limit. In this paper, we combine these mechanisms in an integrated-circuit ring that synthetically rotates in two dimensions, realizing an effective helicoidal motion that provides ultrabroadband quasielectrostatic nonreciprocal responses fitting within a theoretically infinitesimal size. We also analyze the impact of modulation signal noise on time-modulated nonreciprocal components and unveil the role of a dynamic noise mechanism based on which the noise level increases in the presence of a strong signal passing through the component, along with methods to mitigate this effect. We experimentally verify these principles in a three-port integrated circulator based on a 65-nm CMOS process that operates from dc to 1 GHz with a miniaturization factor of 2 × 106.

关键词： Metamaterials Non-reciprocal transmission Photonics Topolectrical circuits

An enzyme-free and ultrafast cell-dissociation technique for cell culture applications using acoustofluidics 24

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An enzyme-free and ultrafast cell-dissociation technique for...

24th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2020

作者： Salari, Alinaghi Appak-Baskoy, Sila Coe, Imogen R. Tsai, Scott S.H. Kolios, Michael C. Canada Biomedical Engineering Graduate Program Ryerson University Canada Department of Chemistry and Biology Ryerson University Canada Molecular Science Graduate Program Ryerson University Canada Department of Mechanical and Industrial Engineering Ryerson University Canada Department of Physics Ryerson University Canada

ISBN: (纸本)9781733419017

Cell-culture techniques are widely used for in-vitro drug screening and biochemical analyses. The classical models for dissociating cell monolayers into single-cell suspensions include enzymatic techniques (e.g., trypsinization). All available enzymatic and non-enzymatic techniques require long treatment duration, typically on the order of minutes (5-10 min). Here, we report a novel, ultrafast, and high-throughput technique, using acoustofluidics, that enables the detachment of adhered cells into suspensions within seconds, while maintaining cellular viability similar to that of the trypsinization method. In our technique, only the adhered cells experience the acoustic waves, minimizing any detrimental effects of the dissociating agent on the detached cells. © 2020 CBMS-0001

关键词： Cells

Mass Relations, Unification, and Proton Decay in the Mirror GUT Model

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arXiv 2022年

作者： Shimizu, Yusuke Takeshita, Shonosuke Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8526 Japan Core of Research for the Energetic Universe Hiroshima University Higashi-Hiroshima739-8526 Japan

We propose an SU(5)×U(1)X×U(1)PQ model without SUSY because the SUSY particles have not been observed yet. The U(1)X gauge symmetry is the generalization of the U(1)B−L gauge symmetry and U(1)PQ symmetry is the global Peccei-Quinn symmetry. We introduce three mirror families in order to unify the SM gauge couplings and avoid the restriction of proton lifetime. In order to obtain the difference of the masses for the down-type quarks and charged leptons, we also introduce the 45 representation Higgs in addition to the 5 representation one. In this paper, we discuss the mass relations between the SM and mirror particles and identify the mass scales of the mirror particles. Since the new particles exist in the intermediate energy scale and contribute to the renormalization group equation, the SM gauge couplings unify successfully at high energy. Our model can be tested by the future proton decay search, e.g., the Hyper-Kamiokande experiment expected as τp(p → π0e+) 35 years. Also, by using the mass relations between the active and mirror neutrinos, we estimate the lower bound of the heavy neutrino masses. © 2022, CC BY.

关键词： Mirrors

Atomic excitation delocalization at the clean to disordered interface in a chirally-coupled atomic array

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arXiv 2023年

作者： Wu, C.-C. Lin, K.-T. Handayana, I.G.N.Y. Chien, C.-H. Goswami, S. Lin, G.-D. Chen, Y.-C. Jen, H.-H. Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics Center for Quantum Science and Engineering National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Department of Physics National Central University Taoyuan City320317 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Trapped-Ion Quantum Computing Laboratory Hon Hai Research Institute Taipei11492 Taiwan

In one-dimensional quantum emitter systems, the dynamics of atomic excitations are influenced by the collective coupling between emitters through photon-mediated dipole-dipole interactions. By introducing positional disorders in a portion of the atomic array, we investigate the delocalization phenomena at the interface between disordered zone and clean zone. The excitation is initialized as symmetric Dicke states in the disordered zone, and several measures are used to quantify the excitation localization. We first use population imbalance and half-chain entropy to investigate the excitation dynamics under time evolutions, and further investigate the crossover of excitation localization to delocalization via the gap ratio from the eigenspectrum in the reciprocal coupling case. In particular, we study the participation ratio of the whole chain and the photon loss ratio between both ends of the atomic chain, which can be used to quantify the delocalization crossover in the non-reciprocal coupling cases. Furthermore, by increasing the overall size or the ratio of the disordered zone under a fixed number of the whole chain, we observe that excitation localization occurs at a smaller disorder strength in the former case, while in the latter, a facilitation of the delocalization appears when a significant ratio of clean zone to disordered zone is applied. Our results can reveal the competition between the clean zone and the disordered zone sizes on localization phenomenon, give insights to non-equilibrium dynamics in the emitter-waveguide interface, and provide potential applications in quantum information processing. Copyright © 2023, The Authors. All rights reserved.

关键词： Photons

Embedding quantum optimization problems using AC driven quantum ferromagnets

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arXiv 2023年

作者： Mossi, Gianni Oganesyan, Vadim Kapit, Eliot KBR Inc. 601 Jefferson St. HoustonTX77002 United States NASA Ames Research Center Moffett Field CA94035 United States Department of Physics and Astronomy College of Staten Island CUNY Staten Island NY10314 United States Physics program and Initiative for the Theoretical Sciences The Graduate Center CUNY New YorkNY10016 United States Department of Physics and Quantum Engineering Program Colorado School of Mines GoldenCO80401 United States

Analog quantum optimization methods, such as quantum annealing, are promising and at least partially noise tolerant ways to solve hard optimization and sampling problems with quantum hardware. However, they have thus far failed to demonstrate broadly applicable quantum speedups, and an important contributing factor to this is slowdowns from embedding, the process of mapping logical variables to long chains of physical qubits, enabling arbitrary connectivity on the short-ranged 2d hardware grid. Beyond the spatial overhead in qubit count, embedding can lead to severe time overhead, arising from processes where individual chains "freeze" into ferromagnetic states at different times during evolution, and once frozen the tunneling rate of this single logical variable decays exponentially in chain length. We show that this effect can be substantially mitigated by local AC variation of the qubit parameters as in the RFQA protocol (Kapit and Oganesyan, Quant. Sci. Tech. 6, 025013 (2021)), through a mechanism we call Symphonic Tunneling. We provide general arguments and substantial numerical evidence to show that AC-driven multi-qubit tunneling is dramatically faster than its DC counterpart, and since ST is not a 1d-specific mechanism, this enhancement should extend to clusters of coupled chains as well. And unlike a uniform transverse field, in higher dimensions this method cannot be efficiently simulated classically. We explore schemes to synchronize the AC tones within chains to further improve performance. Implemented at scale, these methods could significantly improve the prospects for achieving quantum scaling advantages in near-term hardware. © 2023, CC BY.

关键词： Embeddings

Statistical biases in parameterized searches for gravitational-wave polarizations

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arXiv 2025年

作者： Imafuku, Hayato Takeda, Hiroki Nishizawa, Atsushi Watarai, Daiki Cannon, Kipp Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Graduate School of Science The University of Tokyo Tokyo113-0033 Japan The Hakubi Center for Advanced Research Kyoto University Yoshida Ushinomiyacho Sakyo-ku Kyoto606-8501 Japan Department of Physics Kyoto University Kyoto606-8502 Japan Physis Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Astrophysical Science Center Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan

In tests of gravity using gravitational waves (GWs), GW events analyzed are often selected based on specific criteria, particularly the signal-to-noise ratio (SNR). However, such event selection can introduce bias into parameter estimation unless the selection effect is appropriately taken into account in the analysis. In this paper, we investigate how event selection with certain prior information affects parameter inference within the scalar-tensor polarization framework, focusing on the measurement of the scalar mode amplitude parameters. We find that for the Tensor+Scalar(dipole) model, the amplitude of the scalar dipole radiation is overestimated when its true value is nonzero while there is no false deviation in the absence of the scalar mode. The same bias is expected to occur also for the Tensor+Scalar(quadrupole) model. However, error typically exceeds the bias as the scalar quadrupole mode is difficult to be distinguished from the tensor mode. © 2025, CC BY.

关键词： Signal to noise ratio

Steady-state phases and interaction-induced depletion in a driven-dissipative chirally-coupled dissimilar atomic array

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arXiv 2023年

作者： Chung, Shao-Hung Handayana, I. Gusti Ngurah Yudi Tsao, Yi-Lin Wu, Chun-Chi Lin, G.-D. Jen, H.H. Department of Physics Center for Quantum Science and Engineering National Taiwan University Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan Department of Physics National Central University Taoyuan City320317 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Trapped-Ion Quantum Computing Laboratory Hon Hai Research Institute Taipei11492 Taiwan

A nanophotonic waveguide coupled with an atomic array forms one of the strongly-coupled quantum interfaces to showcase many fascinating collective features of quantum dynamics. In particular for a dissimilar array of two different interparticle spacings with competing photon-mediated dipole-dipole interactions and directionality of couplings, we study the steady-state phases of atomic excitations under a weakly-driven condition of laser field. We identify a partial set of steady-state phases of the driven system composed of combinations of steady-state solutions in a homogeneous array. We also reveal an intricate role of the atom at the interface of the dissimilar array in determining the steady-state phases and find an alteration in the dichotomy of the phases strongly associated with steady-state distributions with crystalline orders. We further investigate in detail the interaction-induced depletion in half of the dissimilar array. This blockaded region results from two contrasting interparticle spacings near the reciprocal coupling regime, which is evidenced from the analytical solutions under the reciprocal coupling. Our results can provide insights in the driven-dissipative quantum phases of atomic excitations with nonreciprocal couplings and pave the avenues toward quantum simulations of exotic many-body states essential for quantum information applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Atoms

Wavelength dependence of laser-induced nanowelded microstructures assembled from metal nanoparticles

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arXiv 2023年

作者： Rogers, Ariel Niyonshuti, Isabelle I. Ou, Jun Shrestha, Diksha Chen, Jingyi Wang, Yong Department of Physics University of Arkansas FayettevilleAR72701 United States Department of Chemistry and Biochemistry University of Arkansas FayettevilleAR72701 United States School of Engineering California State Polytechnic University Humboldt ArcataCA95521 United States Mechanical Engineering Program California State Polytechnic University Humboldt ArcataCA95521 United States Cell and Molecular Graduate Program University of Arkansas FayettevilleAR72701 United States Materials Science and Engineering Program University of Arkansas FayettevilleAR72701 United States

Light-based nanowelding of metallic nanoparticles is of particular interest because it provides convenient and controlled means for the conversion of nanoparticles into microstructures and fabrication of nanodevices. Here, we demonstrated the wavelength dependence of laser-induced nanowelded shapes of silver nanoparticles (AgNPs). We observed that the nanowelded microstructures illuminated by the 405 nm laser only were more branched than those formed with illumination of both the 405 nm and 532 nm lasers. We quantified this observation by several compactness descriptors and examined the dependence of the power of the 532 nm laser. More importantly, to understand the experimental observations, we formulated and tested a hypothesis by calculating the wavelength-dependent electric field enhancement due to surface plasmon resonance of the AgNPs and nanowelded microstructures when illuminated with lights at the two wavelengths. Based on the different patterns of "hot spots" for welding AgNPs from these calculations, numerical simulations successfully "reproduced" the different shapes of nanowelded microstructures, supporting our hypothesis. This work suggests the possibility of light-based controlling the shapes of laser-induced nanowelded microstructures of metallic nanoparticles. This work is expected to facilitate the development of better nanowelding strategies of metallic nanoparticles for broader applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Surface plasmon resonance