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841 results for “vibrations”
Vibration-Based Fault Detection in Drone using Artificial Intelligence
<p>Recent years have seen a huge increase in the study of drones. There is a lot of published articles regarding drone, focusing on control optimization, fault detection, safety mechanisms, etc. In fault detection, most of the studies focused on the effects of faulty propellers and rotors, and there is very limited academic research on drone arms. In this paper, a fault detection based on the vibration of the multirotor arms using artificial intelligence (AI) is proposed. There are some cases where due to an accident, the arm<br> of the multirotor crack or loose. This is normally unnoticeable without disassembly and if not taken care of, it would have likely resulted in a sudden loss of flight stability, which will lead to a crash.</p> <p>Two types of AI methods are incorporated in this study, namely, fuzzy logic and neuro-fuzzy, using the fuzzy logic and ANFIS toolbox in the MATLAB software, respectively. For the neuro-fuzzy approach, we use 100 and 1000 datasets to determine the effects of the dataset size on the neuro-fuzzy performance. Both datasets are divided into training (80%), testing (10%), and checking data (10%). The guidelines for constructing the AI algorithms are based on the experimental data for five experimental conditions; (i) (a) Original multirotor condition without modifying the multirotor arms, (b) 100% screwed multirotor arms condition (full tighten), (c) 50% screwed multirotor<br> arms condition (half tighten), (d) 10% screwed multirotor arms condition, and (e) Unscrewed multirotor arm conditions.</p> <p>Their results are compared to determine the best method in predicting the safety of the multirotor. Both methods provided acceptable decision making but the neuro-fuzzy approach depends on the dataset used as overfit model might give incorrect decision making. Because the vibration data are collected in an indoor environment, this framework is more suitable for early prediction before flying the multirotor outdoor. A video demonstrating the real-time deployment of our proposed method is included in the mp4 format.</p>
Molecular Dynamics Study of the Vibrational Energy Exchange Between Nanodiamond and N-butylpyridinium Tetrafluoroborate Ionic Liquid
<p>Nanofluids are composed of certain nanoscale object immersed in the molecular or ionic liquid. Nanofluids generally exhibit higher thermal conductivities, as compared to conventional fluids. Therefore, they are interesting to applications, in which thermal conductivity is a cornerstone. Hereby, molecular dynamics simulations were used to study an energy exchange in one of the possible nanofluids: N-butylpyridinium tetrafluoroborate based solution of nanodiamonds. The data are given in the form of energy components versus time and atomistic trajectories versus time at a number of temperatures. The simulations were conducted in the constant energy ensemble to avoid efects of temperature coupling and pressure coupling. The dataset possesses both research and educational values.</p>
Quantifying lattice vibrational modes in mixed magnetite-maghemite nanoparticles (dataset)
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Federated learning dataset: A case study of vibration analysis for desktop 3D printers
<p>This dataset contains the acceleration data collected from six low-cost 3D printers (same make and model) air-printing cubes with different printing speeds. This dataset can be used as a case study for federated learning, personalized learning, etc.</p>
Figure 3 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 3 Mean number of drumming bouts performed during different portions of calling songs in A. tinnulacita showing standard error of the means. The occurrence of drumming was variable from one calling song to the next. Consistently, more drumming bouts were given during the first 40 percent and the last 20 percent of the major echemes of calling song (n = 14 songs, 1218 drumming bouts total).
Figure 2 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 2 Percent usage of different length drumming bouts during calling songs in A. tinnulacita. (n = 24 songs; 1,503 tapping bouts; error bars are ±SD of the means).
Figure 6 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 6 Audio spectrograms of courtship songs of four species of Anaxipha showing drumming bouts (below 2 kHz) and tegminal sounds (above 4 kHz). Low frequencies (below 2 kHz) were enhanced to better show the low-frequency drumming bouts. A.Anaxipha exigua, dark areas below 1 kHz are drumming bouts; B.Anaxipha tinnulacita, fine, dark lines after 1:05 (min:sec) are the drumming bouts; C.Anaxipha tinnulenta, the dark areas after 5 sec and below 2 kHz are the drumming bouts; D.Anaxipha thomasi, the compact dark areas below 2 kHz are the drumming bouts. The clustered, individual taps between drumming bouts are sounds made by the insect jumping repeatedly and rapidly between echemes during the courtship display. Note that the time scales for each courtship song are different, as each species courtship song length is different and variable.
Figure 5 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 5 Audio spectrograms of three seconds of calling and courtship songs of the four species of Anaxipha. A1.A. exigua calling song; A2.A. exigua courtship song; B1.A. tinnulacita calling song; B2.A. tinnulacita courtship song; C1.A. tinnulenta calling song; C2.A. tinnulenta courtship song; D1.A. thomasi calling song; D2.A. thomasi courtship song. Compared to calling song, the individual syllables of courtship songs are shorter, patterned differently, with more sounds associated with wing-opening movements (wing-dragging).
Figure 4 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 4 Oscillograms of the calling and courtship songs of the four species of Anaxipha. A1.A. exigua calling song; A2.A. exigua courtship song; B1.A. tinnulacita calling song; B2.A. tinnulacita courtship song; C1.A. tinnulenta calling song; C2.A. tinnulenta courtship song; D1.A. thomasi calling song; D2.A. thomasi courtship song. All audio files were normalized to -3 dBFS for comparison. Y-axis represents amplitude and is analogous to dBFS (full scale).
Figure 7 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 7 Examination of the means of the average power of the combined first two and the combined last two taps of drumming bouts in courtship songs ±SD. In nearly all instances, tapping becomes louder during an individual drumming bout within courtship songs across all four species. Numbers closer to the abscissas are louder. a = average of the first two taps, b = average of the last two taps in bouts of four taps or more. * = t-tests comparing the means of first two taps to the last two taps, within each species, showed the p-values were all < 0.0001, showing that the taps are significantly louder at the end of drumming bouts (A. exigua n = 5 songs, 45 drumming bouts; A. tinnulacita n = 4, 29; A. tinnulenta n = 4, 98; A. thomasi n = 5, 75).
Figure 1 from: Hershberger WL (2021) Substrate-borne vibrations used during acoustic communication and the existence of courtship songs in some species of the genus Anaxipha (Saussure) (Orthoptera: Trigonidiidae: Trigonidiinae). Journal of Orthoptera Research 30(2): 185-191. https://doi.org/10.3897/jor.30.70990
Figure 1 A typical drumming bout showing the low-frequency and brief nature of these sounds. The figure is the selection of a drumming bout from a courtship song of A. thomasi showing the selection window spanning from the middle of the first tap to the middle of the last tap. This tapping bout consists of 12 taps.
Original data for publication: Molecule-like and Lattice Vibrations in Metal Clusters
<p>Original Data for publication Molecule-like and Lattice Vibrations in Metal Clusters</p> <p> </p>
Data: How Crystal Symmetry Dictates Non-Local Vibrational Circular Dichroism in the Solid State
<p>This data supplements our article <a href="https://onlinelibrary.wiley.com/doi/10.1002/anie.202215599">How Crystal Symmetry Dictates Non-Local Vibrational Circular Dichroism in the Solid State</a></p> <p>We provide a <em>Jupyter</em> notebook and the data files to generate IR and VCD spectra in solid-state using our python package <a href="https://doi.org/10.5281/zenodo.4775330"><em>ChirPy</em></a>.</p>
Raw Raman Vibrational Spectra from Hydrothermal Diamond Anvil Cell Experiments Involving Silicate Melt - Fluid Equilibria for the H2-H2O-silicate system
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The Vibrations of Ancient Incarnations
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APPLICATION OF DIFFERENTIAL EQUATIONS TO PHYSICAL EXAMPLES IN THE STUDY OF FORCED VIBRATIONS WITHOUT TAKING INTO ACCOUNT THE RESISTANCE OF THE MEDIUM.
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APPLICATION OF DIFFERENTIAL EQUATIONS TO PHYSICAL EXAMPLES IN THE STUDY OF HARMONIC VIBRATIONS.
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APPLICATION OF DIFFERENTIAL EQUATIONS TO PHYSICAL EXAMPLES IN THE STUDY OF DAMPED VIBRATIONS.
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vibration-shear simulations
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Data from: Get off my back: vibrational assessment of homeowner strength
Animals may use a variety of sensory modalities to assess ownership and resource holding potential (RHP). However, few studies have experimentally tested whether animals can assess these key variables through a purely vibrational modality, exclusively involving substrate-borne vibrations. Here we studied social terrestrial hermit crabs (Coenobita compressus), where competitors assess homeowners by climbing on top of a solid external structure—an architecturally remodelled shell home, inside of which the owner then produces vibrations. In the field, we used a miniature vibratory device, hidden within an empty shell, to experimentally simulate a 'phantom owner', with variable amplitudes of vibration representing different levels of homeowner strength. We found that assessors could use these vibrations to deduce the owner's RHP: for strong vibrations (indicative of a high RHP owner) assessors were least likely to escalate the conflict; for weak vibrations (indicative of a low RHP owner) assessors showed intermediate escalation; and in the absence of vibration (indicative of an extremely weak or absent owner) assessors were most likely to escalate. These results reveal that animals can assess homeowner strength based solely on substrate vibrations, thereby making important decisions about whether to escalate social conflicts over property.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
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