A Tower of Voices at the Flight 93 Memorial

“We also needed a type of structural engineer who deals with moving mechanisms and dynamic forces, because the chime mechanism is our biggest technical challenge to work out,” Murdoch says.
The tower’s meant to be ever-changing with natural forces, and a one-of-kind experience for visitors at any time of day or season. There are different moods from different conditions on site.
“We’re trying to achieve that in terms of sound because it’s changing with the wind with a lot different qualities with the sound,” he says. “The winter wind is quite severe, at 30 to 40 miles per hour from the northwest, and the rest of the year it comes from different directions and lower wind speeds.”
Source: http://architectsandartisans.com/a-tower-o...