Wind Turbine Infra Sound NASA -US Department of Energy 1985

Wind Turbine Infra Sound NASA -US Department of Energy 1985

This report summarizes extensive research by staff of the Solar Energy Research Institute and its subcontractors conducted to establish the origin and possible amelioration of acoustic disturbances associated with the operation of the DOE/NASA MOD-1 wind turbine installed near Boone, North Carolina. 

Results have shown that the most probable source of this acoustic annoyance was the transient, 'unsteady aerodynamic lift imparted to the turbine blades as they passed through the lee wakes of the large, cylindrical tower supports. 
Nearby residents were annoyed by the low-frequency, acoustic impulses propagated into the structures in which the complainants lived. The situation was aggravated further by a complex sound propagation process controlled by terrain and atmospheric focusing. Several techniques for reducing the abrupt, unsteady blade load transients were researched and are discussed. 
Neil Kelley, Principal Scientist Wind Energy Section
This document summarizes the results of an extensive investigation into the physical factors surrounding noise complaints related to the DOE/NASA MOD-l wind turbine operating near Boone, North Carolina.
The authors wish to acknowledge the support and assistance of the following
organizations in SERI's MOD-l research:
• Appalachian State University
• The Blue Ridge Electric Membership Corporation
• Engineering Dynamics, Inc.
• Fairchild-Weston
Cornell University, Sibley School of Mechanical and Aerospace
Engineering
• The General Electric Company
• Massachusetts Institute of Technology, Department of Aeronautics and
Astronautics
• NASA Langley Research Center, Structural Acoustics Branch
• NASA Lewis Research Center, Wind Energy Program Office
• Pacific Northwest Laboratories, Atmospheric Physics Department
• Pennsylvania State University, Departments of Meteorology and Mechanical
Engineering
• The Portland General Electric Company
• Rocky Flats Wind Energy Research Center
• University of Colorado-Boulder, Departments of Mechanical and Aerospace
Engineering
• University of Virginia, Department of Environmental Sciences
Special thanks are extended to the residents of Boone, North Carolina,
particularly those near the MOD-l site who aided us in this investigation.
Some parts of the program could not have been accomplished without the help of
SERI staff members Stan Thues, Bob McConnell, and Jane Ullman. Benjamin Bell
was responsible for developing much of the computerized, time-domain analysis
technique. University of Colorado-Boulder (UCB) engineering undergraduates
Robert Wooten, David Dill, and Daniel Schell were responsible for supporting
the testing at the Rocky Flats Research Center and provided the bulk of the
support and planning for the testing in the UCB wind tunnel. This work was
supported by the DOE Wind Energy Technology Division under contracts
EG-77-C-Ol-4042 and DE-AC02-83CHl009

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Maine Center For Public Interest Reporting – Three Part Series: A CRITICAL LOOK AT MAINE’S WIND ACT

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(excerpts) From Part 1 – On Maine’s Wind Law “Once the committee passed the wind energy bill on to the full House and Senate, lawmakers there didn’t even debate it. They passed it unanimously and with no discussion. House Majority Leader Hannah Pingree, a Democrat from North Haven, says legislators probably didn’t know how many turbines would be constructed in Maine if the law’s goals were met." . – Maine Center for Public Interest Reporting, August 2010 https://www.pinetreewatchdog.org/wind-power-bandwagon-hits-bumps-in-the-road-3/From Part 2 – On Wind and Oil Yet using wind energy doesn’t lower dependence on imported foreign oil. That’s because the majority of imported oil in Maine is used for heating and transportation. And switching our dependence from foreign oil to Maine-produced electricity isn’t likely to happen very soon, says Bartlett. “Right now, people can’t switch to electric cars and heating – if they did, we’d be in trouble.” So was one of the fundamental premises of the task force false, or at least misleading?" https://www.pinetreewatchdog.org/wind-swept-task-force-set-the-rules/From Part 3 – On Wind-Required New Transmission Lines Finally, the building of enormous, high-voltage transmission lines that the regional electricity system operator says are required to move substantial amounts of wind power to markets south of Maine was never even discussed by the task force – an omission that Mills said will come to haunt the state.“If you try to put 2,500 or 3,000 megawatts in northern or eastern Maine – oh, my god, try to build the transmission!” said Mills. “It’s not just the towers, it’s the lines – that’s when I begin to think that the goal is a little farfetched.” https://www.pinetreewatchdog.org/flaws-in-bill-like-skating-with-dull-skates/

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Hannah Pingree on the Maine expedited wind law

Hannah Pingree - Director of Maine's Office of Innovation and the Future

"Once the committee passed the wind energy bill on to the full House and Senate, lawmakers there didn’t even debate it. They passed it unanimously and with no discussion. House Majority Leader Hannah Pingree, a Democrat from North Haven, says legislators probably didn’t know how many turbines would be constructed in Maine."

https://pinetreewatch.org/wind-power-bandwagon-hits-bumps-in-the-road-3/

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