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10.Wind turbines are efficient sources of cheap energy but also a source of concern as their huge spinning blades (叶片) frequently kill birds and bats. A new type of wind generator developed in Spain offers a creative solution to that problem.
In 2002, Spanish inventor David Yanez saw a short film about the Tacoma Narrows Bridge in the U.S., collapsing in strong wind. It was a vivid example of the powerful vibrations wind can create when it blows past a long pole, such as a car antenna or even a stick of bamboo. It gave him the idea for a new type of wind-energy generator.
“The initial philosophy or spirit was to create a generator of dreams that had all the qualities one would want: It should be as cheap as possible, need as little maintenance as possible, the setup as simple as possible,” he said.
Yanez and his friend Raoul Martin took the idea to an engineering firm, where they were told it would never work. Undiscouraged, they started experimenting on their own in a small wind tunnel they built.
Good initial results were repeated by a larger working model called Vortex (涡旋) installed in a nearby field. “What we have is a mast (桅杆), which is the top piece and acts as a blade,” Yanez said. “It’s constructed from the same material as a conventional generator, and what it does is it oscillates (振荡), transmitting the oscillation to a conventional alternator, which by its own oscillation converts the wind’s energy into electric energy.”
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