The main cause of wind turbine failure, noise, wear and damage is excessive vibration, according to a leading American researcher.
Daryoush Allaei spoke about problems associated with the towers at the Institute of Acoustics’ Wind Turbine Noise meeting at Cardiff, January 27.
“Excess noise has become a growing problem for farmers and those living near wind farms,” said Daryoush, founder and chief executive officer of Quality Research, Development and Consulting Inc, Chaska, Minnesota.
Historically, rotating and turbine machinery failures have resulted from “blade mistuning, misalignment, imbalance, resonance, fastener looseness and bearing damages and defects,” he said. Three of these “root causes” were “responsible for more than eighty percent of excess vibration and noise and machinery wear, failure and downtime”. “Wind turbine-generator systems are no exception; they follow the same failure modes,” he said.
Daryoush, who has a Pd.D. in Mechanics, has authored and co-written about ninety national and international professional articles and was included in the 1992 edition of “Who’s Who Among Rising Young Americans”.
When asked whether wind farm noise could be eliminated, Daryoush replied: “Yes, we have shown we can totally eliminate the noise and excess vibration coming from the top of the towers”. “QRDC has been in research development working on noise and vibration of both military and commercial systems since 1990. We have been very successful. Our methodology relies on managing energy and eliminating the root causes of noise and vibration in contrast to others who band-aid the problem.”
The company approached wind farm noise in a manner similar to its work in the mining and processing industry. “We have managed to fully mitigate the excess vibration and noise from the conventional wind farms by eliminating the root causes of vibrations, namely turbine blades, gearboxes, generators, power transferring shafts, bearings.” “By better understanding the root causes of noise and vibration, one could significantly boost performance, maintainability and reliability while reducing downtime and catastrophic failures of wind turbine generator systems that are becoming crucial to meeting the global renewable energy goals,” said Daryoush.
Source British Institute of Acoustics