Variations in gear fatigue life for different wind turbine braking strategies

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A large number of gearbox failures have occurred in the wind industry in a relatively short period, many because service loads were underestimated. High-torque transients that occur during starting and stopping are difficult to predict and may be overlooked in specifying gearbox design. Although these events comprise a small portion of total load cycles, they can be the most damaging. The severity of these loads varies dramatically with the specific configuration of the wind turbine. The large number of failures in Danish-designed Micon 65 wind turbines prompted this investigation. The high-speed and low-speed shaft torques were measured on a two-stage ... continued below

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Pages: (10 p)

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McNiff, B.P. (Second Wind, Inc., Somerville, MA (USA)); Musial, W.D. (Solar Energy Research Inst., Golden, CO (USA)) & Errichello, R. (GEARTECH, Albany, CA (USA)) June 1, 1991.

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Description

A large number of gearbox failures have occurred in the wind industry in a relatively short period, many because service loads were underestimated. High-torque transients that occur during starting and stopping are difficult to predict and may be overlooked in specifying gearbox design. Although these events comprise a small portion of total load cycles, they can be the most damaging. The severity of these loads varies dramatically with the specific configuration of the wind turbine. The large number of failures in Danish-designed Micon 65 wind turbines prompted this investigation. The high-speed and low-speed shaft torques were measured on a two-stage helical gearbox of a single Micon 65 turbine. Transient events and normal running loads were combined statistically to obtain a typical annual load spectrum. The pitting and bending fatigue lives of the gear teeth were calculated by using Miner's rule for four different high-speed shaft brake configurations. Each breaking scenario was run for both a high- and a low-turbulence normal operating load spectrum. The analysis showed increases in gear life by up to a factor of 25 when the standard high-speed shaft brake is replaced with a dynamic brake or modified with a damper. 9 refs., 9 figs., 3 tabs.

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Pages: (10 p)

Notes

OSTI; NTIS; GPO Dep.

Source

  • Windpower '90, Washington, DC (USA), 25-28 Sep 1990

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  • Other: DE91002161
  • Report No.: SERI/TP-257-3984
  • Report No.: CONF-9009107--7
  • Grant Number: AC02-83CH10093
  • Office of Scientific & Technical Information Report Number: 5828926
  • Archival Resource Key: ark:/67531/metadc1095325

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • March 2, 2018, 5:25 p.m.

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McNiff, B.P. (Second Wind, Inc., Somerville, MA (USA)); Musial, W.D. (Solar Energy Research Inst., Golden, CO (USA)) & Errichello, R. (GEARTECH, Albany, CA (USA)). Variations in gear fatigue life for different wind turbine braking strategies, article, June 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1095325/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.