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  • Impact time series for three dimensional cusped body (ref. Troesch and Wang, 1987)

    Creator:
    Troesch, Armin, W. and Kang, C.-G.
    Description:
    This scaled acceleration time series has been used in the graduate class, NA540, as an example of hydrodynamic impact. For a more detailed description of the tests, please see: Troesch, A.W. and Kang, C.-G., "Hydrodynamic Impact Loads on Three Dimensional Bodies," Proceedings of the 16th Symposium on Naval Hydrodynamics, Berkeley, July 1986, National Academy Press, Washington, D.C., 1987, pp. 537-558.
    Keyword:
    hydrodynamic impact
    Citation to related publication:
    Troesch, A.W. and Kang, C.-G., "Hydrodynamic Impact Loads on Three Dimensional Bodies," Proceedings of the 16th Symposium on Naval Hydrodynamics, Berkeley, July 1986, National Academy Press, Washington, D.C., 1987, pp. 537-558. This item is not available online due to copyright restrictions, but the text can be searched using Hathi Trust:  https://babel.hathitrust.org/cgi/pt?id=mdp.39015040312475
    Discipline:
    Science and Engineering
    Title:
    Impact time series for three dimensional cusped body (ref. Troesch and Wang, 1987)

  • A template model explains jerboa gait transitions across a broad range of speeds

    Creator:
    Ding, J, Moore, TY, and Gan, Z
    Description:
    Jerboas (Jaculus jaculus) are bipedal hopping rodents that frequently transition between gaits (running, hopping, and skipping) throughout their entire speed range. It has been hypothesized that these non-cursorial bipedal gait transitions are likely to enhance their maneuverability and predator evasion ability. However, it is difficult to use the underlying dynamics of these locomotion patterns to predict gait transitions due to the large number of degrees of freedom expressed by the animals. To this end, we used empirical jerboa kinematics and dynamics to develop a unified Spring Loaded Inverted Pendulum model with defined passive swing leg motions. The simulated trajectories from the model precisely matched the experimental data. Jerboas were observed to apply different neutral swing leg angles during locomotion. By investigating the gait structure of the model with coupled and uncoupled neutral swing leg, we found two set of mechanism may explain the frequent gait transitions of jerboas.
    Keyword:
    jerboa, legged locomotion, gait transition, Legged Robots, Dynamics, Bipedal locomotion, and Non-cursorial locomotion
    Citation to related publication:
    Ding, Moore, Gan (submitted) A template model explains jerboa gait transitions across a broad range of speeds. Frontiers in Bioengineering And Biotechnology
    Discipline:
    Engineering and Science
    Title:
    A template model explains jerboa gait transitions across a broad range of speeds

  • Bounce-Averaged Quasi-Linear Diffusion Model Simulation Input/Output on Mars’ Crustal Magnetic Field

    Creator:
    Alexander Shane
    Description:
    To study the effect of whistler mode waves on the superthermal electron velocity space at Mars, a numerical model was built to solve the bounce-averaged quasi-linear diffusion equation on a crustal field. This dataset includes the input and output variables to this model for the simulations performed in Shane and Liemohn, 2022. The studies using this dataset were conducted by Alex Shane in the Climate and Space Sciences and Engineering Department at the University of Michigan. This research was supported by the National Aeronautics and Space Administration (NASA) Grant NNX16AQ04G to the University of Michigan and the Rackham Predoctoral Fellowship.
    Keyword:
    Mars, Electron, and Crustal Fields
    Citation to related publication:
    Shane, A. D. and Liemohn, M W., (2022) Modeling Wave-Particle Interactions with Photoelectrons on the Dayside Crustal Fields of Mars, Geophysical Research Letters, In revision.
    Discipline:
    Science
    Title:
    Bounce-Averaged Quasi-Linear Diffusion Model Simulation Input/Output on Mars’ Crustal Magnetic Field

  • VISTA TEC database

    Creator:
    Sun, Hu, Ren, Jiaen, Chen, Yang, and Zou, Shasha
    Description:
    Our research focuses on providing a fully-imputed map of the worldwide total electron content with high resolution and spatial-temporal smoothness. We fill in the missing values of the original Madrigal TEC maps via estimating the latent feature of each latitude and local time along the 2-D grid and give initial guess of the missing regions based on pre-computed spherical harmonics map. The resulting TEC map has high imputation accuracy and the ease of reproducing. and All data are in HDF5 format and are easy to read using the h5py package in Python. The TEC map is grouped in folders based on years and each file contains a single-day data of 5-min cadence. Each individual TEC map is of size 181*361.
    Keyword:
    Total Electron Content, Matrix Completion, VISTA, Spherical Harmonics, and Spatial-Temporal Smoothing
    Citation to related publication:
    Sun, H., Hua, Z., Ren, J., Zou, S., Sun, Y., & Chen, Y. (2020). Matrix Completion Methods for the Total Electron Content Video Reconstruction. arXiv preprint arXiv:2012.01618. and Zou, S., Ren, J., Wang, Z., Sun, H., & Chen, Y. (2021). Impact of Storm-Enhanced Density (SED) on Ion Upflow Fluxes During Geomagnetic Storm. Frontiers in Astronomy and Space Sciences, 162.
    Discipline:
    Science
    Title:
    VISTA TEC database

  • A 3D Physics-based Particle Model of the Venus Oxygen Corona: Variations with Solar Activity

    Creator:
    Valeriy Tenishev
    Description:
    Here we present an investigation of the variability of Venus' extended oxygen corona. For that, we employ a combination of a fluid model VTGCM for simulating Venus' ionosphere and thermosphere and kinetic model AMPS. We have found excellent agreement of the model results with PVO observations of the corona when the modeling is done assuming the solar maximum conditions, which corresponds to the solar conditions during the observations. We also found that the oxygen density strongly depends on the solar conditions and varies by order of magnitude over a solar cycle. That explains why the extended oxygen corona was observed only at the solar maximum. The result presented in this paper will be used in a later study of the planet's interaction with the ambient solar wind, where the corona model defines the mass loading coefficient.
    Keyword:
    Venus, VTGCM, AMPS, and Venus extended corona
    Discipline:
    Science
    Title:
    A 3D Physics-based Particle Model of the Venus Oxygen Corona: Variations with Solar Activity

  • Neotropical snake photographs

    Creator:
    University of Michigan, Division of Herpetology, Davis Rabosky, Alison R, Larson, Joanna G, Moore, Talia Y, and Curlis, John David
    Description:
    This dataset includes dorsal and ventral photographs of Neotropical snakes collected in the Peruvian Amazon. These data were collected to survey and examine the diversity in color pattern evolution in Neotropical snakes.
    Keyword:
    snake, color, serpentes, and Peru
    Citation to related publication:
    (work in progress, not yet submitted)
    Discipline:
    Science
    Title:
    Neotropical snake photographs

  • BIRDS Lab Multipod robot motion tracking data - processed data and code

    Creator:
    BIRDS Lab, U. Michigan
    Description:
    These data were produced for ARO W911NF-14-1-0573 "Morphologically Modulated Dynamics" and ARO MURI W911NF-17-1-0306 "From Data-Driven Operator Theoretic Schemes to Prediction, Inference, and Control of Systems" to explore the trade-offs between various oscillator coupling models in modeling multilegged locomotion of Multipod robots with 6,8,10 and 12 legs. The data is stored in .csv.gz files, one file for each robot morphology. Details of how to run the processing code on the raw dataset to generate the processed files found here, as well as example code for loading the data found here, are in the README. This dataset is self contained and can be used on its own without running any of the provided code.
    Citation to related publication:
    Zhao, D. & Revzen, S. Multi-legged steering and slipping with low DoF hexapod robots Bioinspiration & biomimetics, 2020, 15, 045001  https://doi.org/10.1088/1748-3190/ab84c0, Zhao, D. Ph.D. Thesis "Locomotion of low-DOF multi-legged robots" University of Michigan 2021  https://deepblue.lib.umich.edu/handle/2027.42/169985, and BIRDS Lab Multipod robot motion tracking data - RAW data, doi:10.7302/m05a-0d90
    Discipline:
    Engineering and Science
    Title:
    BIRDS Lab Multipod robot motion tracking data - processed data and code

  • BIRDS Lab Multipod robot motion tracking data - VIDEOS dataset

    Creator:
    BIRDS Lab U. Michigan
    Description:
    This dataset contains the videos used for  https://doi.org/10.7302/m05a-0d90 (the "raw" motion tracking dataset), and is intended to be unpacked into the same directory tree. The data were produced for ARO W911NF-14-1-0573 "Morphologically Modulated Dynamics" and ARO MURI W911NF-17-1-0306 "From Data-Driven Operator Theoretic Schemes to Prediction, Inference, and Control of Systems" to explore the trade-offs between various oscillator coupling models in modeling multilegged locomotion. The data were also used extensively in examining multi-contact slipping, in the studying the influence of number of legs on otherwise identical locomotion patterns, and in the use of geometric mechanics models for multilegged locomotion. Folder and file names encode the meta-data, with names following an informative naming convention documented in the README.
    Keyword:
    phase, multilegged, robot, and locomotion
    Citation to related publication:
    BIRDS Lab U. Michigan. BIRDS Lab Multipod robot motion tracking data - RAW dataset [Data set], University of Michigan - Deep Blue Data.  https://doi.org/10.7302/m05a-0d90, Zhao, D. Ph.D. Thesis "Locomotion of low-DOF multi-legged robots" University of Michigan 2021  https://deepblue.lib.umich.edu/handle/2027.42/169985, and Zhao, D. & Revzen, S. Multi-legged steering and slipping with low DoF hexapod robots Bioinspiration & biomimetics, 2020, 15, 045001  https://doi.org/10.1088/1748-3190/ab84c0
    Discipline:
    Engineering and Science
    Title:
    BIRDS Lab Multipod robot motion tracking data - VIDEOS dataset

  • BIRDS Lab Multipod robot motion tracking data - RAW dataset

    Creator:
    BIRDS Lab U. Michigan
    Description:
    These data were produced for ARO W911NF-14-1-0573 "Morphologically Modulated Dynamics" and ARO MURI W911NF-17-1-0306 "From Data-Driven Operator Theoretic Schemes to Prediction, Inference, and Control of Systems" to explore the trade-offs between various oscillator coupling models in modeling multilegged locomotion. The data were also used extensively in examining multi-contact slipping, in the studying the influence of number of legs on otherwise identical locomotion patterns, and in the use of geometric mechanics models for multilegged locomotion. Folder and file names encode the meta-data, with names following an informative naming convention documented in the README.
    Keyword:
    phase, multilegged, robot, and locomotion
    Citation to related publication:
    Zhao, D. & Revzen, S. Multi-legged steering and slipping with low DoF hexapod robots Bioinspiration & biomimetics, 2020, 15, 045001  https://doi.org/10.1088/1748-3190/ab84c0 and Zhao, D. Ph.D. Thesis "Locomotion of low-DOF multi-legged robots" University of Michigan 2021  https://deepblue.lib.umich.edu/handle/2027.42/169985
    Discipline:
    Engineering and Science
    Title:
    BIRDS Lab Multipod robot motion tracking data - RAW dataset

  • CT Data of UMMP VP 85286, Carpodaptes stonleyi left dentary I/1-2, P/4

    Creator:
    University of Michigan Museum of Paleontology and CTEES
    Description:
    Reconstructed CT slices for a left dentary of Carpodaptes stonleyi (University of Michigan Museum of Paleontology catalog number UMMP VP 85286) as a series of TIFF images. Raw projections are not included in this dataset.
    Keyword:
    Paleontology, Fossil, CT, Carpolestidae, UMMP, University of Michigan Museum of Paleontology, Paleocene, CTEES, and ed7da511-d04c-fd32-09ef-0ea552966545
    Discipline:
    Science
    Title:
    CT Data of UMMP VP 85286, Carpodaptes stonleyi left dentary I/1-2, P/4