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[{"model": "core.projectfund", "pk": 22982, "fields": {"project": 163, "organisation": 2, "amount": 0, "start_date": "2020-09-30", "end_date": "2024-09-29", "raw_data": 38729}}]
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[{"model": "core.projectfund", "pk": 15079, "fields": {"project": 163, "organisation": 2, "amount": 0, "start_date": "2020-09-30", "end_date": "2024-09-29", "raw_data": 7502}}]
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[{"model": "core.projectorganisation", "pk": 57375, "fields": {"project": 163, "organisation": 884, "role": "STUDENT_PP_ORG"}}]
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[{"model": "core.projectorganisation", "pk": 57374, "fields": {"project": 163, "organisation": 1047, "role": "LEAD_ORG"}}]
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[{"model": "core.projectperson", "pk": 35254, "fields": {"project": 163, "person": 2488, "role": "STUDENT_PER"}}]
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[{"model": "core.projectperson", "pk": 35253, "fields": {"project": 163, "person": 1306, "role": "SUPER_PER"}}]
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| April 11, 2022, 1:46 a.m. |
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{"title": ["", "Impacts of Atmospheric Turbulence on Wind Turbine Main-Bearing Function and Failures"], "description": ["", "\nThe continued expansion of wind energy within nations' energy portfolios requires continued reductions in\nthe levelized cost of energy (LCOE), the ratio of financial cost to purchase and operate wind farms to financial\ngain from the electrical power produced by the wind farm. Major contributors to the numerator include\nreplacement costs for premature component failure on the drivetrain, including, in particular, the main bearing\n(Hart et al. 2020a). Whereas main bearing failure is likely not subsurface fatigue-related (Hart, et al. 2019) and\na number of potential mechanisms likely contribute, the dominant processes underlying premature main\nbearing failures are not currently known (Hart, et al. 2019,2020a). Work has been undertaken to develop a\nsystematic approach to the study of main bearing loading and failure mechanisms (Hart 2020b); wherein, it is\ndemonstrated that a detailed understanding of the loads experienced by the main bearing, and their causal\nmechanisms, is a necessary prerequisite to progress in this field. The proposed research programme centers on\nthe hypotheses that (1) the mechanisms underlying premature main bearing failures result from specific\nrepetitive time changes in the bearing load-zone, and (2) that these deleterious load-zone forcings are in\nresponse to specific temporal characteristics in the moments and forces on the main shaft that result from the\npassage of the energy-dominant atmospheric turbulence eddies through the wind turbine rotor plane.\nUtility-scale wind turbines and wind farms respond to turbulence within the "atmospheric boundary layer"\n(ABL), the 1-2 km region of the troposphere adjacent to the earth's surface. During the day, the structure of the\nturbulence eddies transported within the ABL is driven by strong convection and strong shear, a coherent eddy\nstructure that varies systematically with the global stability state of the ABL (Khanna & Brasseur 1998, Jayaraman\n& Brasseur 2014). As the eddies interact with rotating wind turbine blades, high temporal variabilities in\naerodynamic loads pass from the rotor hub to the main shaft in the form of torque, bending moment and axial\nforce fluctuations (Vijayakumar, et al. 2016) with three characteristic time scales (Nandi, et al. 2017) in main\nshaft moments (Lavely 2017). The shortest of these is below 1 sec. with relative variability on order 50%\n(Vijayakumar, et al. 2016). Lavely (2017) showed that, whereas main shaft torque fluctuations respond to rotoraveraged\nhorizontal winds, shaft bending moment fluctuations respond to time changes in spatial asymmetry in\nhorizontal velocity over the rotor plane, generated as turbulence eddies pass through the rotor.\nIf the above hypotheses are valid, it follows that the turbulence-generated deleterious load fluctuations on\nthe main bearing are likely driven by different classes of turbulence structure and loading response at different\ntime scales as atmospheric eddies pass through the rotor plane. Since ABL turbulence structure varies with\natmospheric stability, deleterious load characteristics change during the day and among seasons, as well as with\ntopography. Furthermore, within a wind farm the hypotheses can be extended to include potential deleterious\nmain bearing responses to combinations of atmospheric and rotor wake turbulence eddying motions due\nespecially to the generation of spatial asymmetries over wind turbine rotor planes.\n\n"], "extra_text": ["", "\n\n\n\n"], "status": ["", "Active"]}
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| April 11, 2022, 1:46 a.m. |
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{"external_links": [281]}
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| April 11, 2022, 1:46 a.m. |
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[{"model": "core.project", "pk": 163, "fields": {"owner": null, "is_locked": false, "coped_id": "eae4afdb-d0a8-4bda-8b72-d4f10ef0bad9", "title": "", "description": "", "extra_text": "", "status": "", "start": null, "end": null, "raw_data": 7488, "created": "2022-04-11T01:29:00.549Z", "modified": "2022-04-11T01:29:00.549Z", "external_links": []}}]
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