DOI: 10.25403/upresearchdata.13476525
title: Towards a hybrid approach for diagnostics and prognostics of planetary gearboxes

description: <br>Data measured for the completion of masters in mechanical engineering thesis "Towards a hybrid approach for diagnostics and prognostics of planetary gearboxes" under the supervision of Prof P.S. Heyns and Dr S. Schmidt.<br>The data set consist of accelerometer measurements on the gearbox housing of a planetary gearbox with varying degrees of seeded damage.<br>README.md:# Folders and files<br>- g1_crack: Gear 1, 8 different damage states (crack lengths) tested at different operating conditions.<br> - .MAT files contain the measured data. G1 refers to gear 1, P refers to the testing phase or degree of damage (crack length) tested at.<br> - G1_microscope_images is a folder with photos of the gear with different crack lengths tested.<br>- g2_crack: Gear 2, 6 different damage states at different operating conditions.<br> - .MAT files contain the measured data. G2 refers to gear 2, P refers to the testing phase or degree of damage<br> (crack length) tested at.<br> - G2_microscope_images is a folder with photos of the gear with different crack lengths tested.<br>- missing_tooth: Data for a planet gear with a missing planet gear tooth.<br> This dataset's original purpose was to see if it is possible to grow a crack in one of the gear teeth in situ (It<br> was not possible).<br> There is, therefore, in addition to the missing gear teeth, one of the gear teeth that is cracked (crack depth ~20%<br> of gear width).<br> However, the vibration response is dominated by the excitation due to the missing tooth.<br> - compare_healthy_with_missing_tooth: Two example datasets measured in healthy and damaged condition.<br> Provides simple way to get exposed to the diagnostics problem for planetary gearboxes. This dataset is valuable for learning how about how a fault manifests in the vibration response of a planetary gearbox.<br> However, there are independent variables (see below) that are not kept constant between the healthy and damaged cases. Therefore, these datasets should only be used as a convenient introduction to the planetary gearbox diagnostics problem,<br> and not for publication.<br><br> -Healthy.h5 is the vibration response of the gearbox in healthy condition, but the gearbox housing is not yet modified<br> as is the case with the missing_tooth.h5 dataset (See dissertation).<br> The vibration signature of the housing may therefore be slightly different from the missing tooth dataset. However, this<br> likely has negligible influence considering the severity of the damage.<br> -The datasets in this example are chosen specifically to have similar measured RPM values.<br><br># Information<br>Data is gathered for a planetary gearbox with a single planet gear to simplify detection of the damage.<br> The shaft key, as detected by the magnetic pickup, is aligned with the planet gear.<br> The planetary gearbox is the Bonfiglioli 300-L 1-5.77-PC-V01 B·E, with 13 sun gear teeth, 24 planet gear teeth and<br> 62 ring gear teeth. Gear ratio:5.77.<br><br> For more information, please consult the dissertation "Towards a hybrid approach for diagnostics and prognostics of<br> planetary gearboxes" or contact Douw Marx at douwmarx@gmail.com.<br><br># Folders<br>-h5: Data in .h5 format<br>-raw: Data in original format as measured<br>-load_data_with_python: Simple script to easily load the .h5 data with Python.<br> <br> For more information, please consult the dissertation "Towards a hybrid approach for diagnostics and prognostics of<br> planetary gearboxes" (https://repository.up.ac.za/) (https://repository.up.ac.za/handle/2263/78157) or contact Douw Marx at douwmarx@gmail.com.<br><br># Attribute Information:<br>All channels measured, in order:<br>1. 'Time': Time [s]<br>2. 'Acc_Carrier': Carrier side accelerometer [m/s^2]<br>3. 'Acc_Sun': Carrier side accelerometer [m/s^2]<br>4. 'Tacho_Carrier': Zebra tape tacho encoder on carrier-side<br>5. 'Tacho_Sun': Zebra tape tacho encoder on sun-side<br>6. '1PR_Mag_Pickup': Magnetic pickup <br>7. 'T_amb': Ambient temperature [Celsius]<br>8. 'T_oil': Oil temperature [Celsius]<br>9. 'Torque': Motor current proportional to applied torque<br><br><br># Code<br>For data processing code see https://github.com/DouwMarx/Hybrid_Approach_To_Planetary_Gearbox_Prognostics<br><br><br>