#physics **Destructive Resonance Part 2** or organ pipes. This became a billion dollar issue at a nuclear plant. The key to destructive resonance is that the input can tune to the pipe resonance. Just like nuclear plants, the pipe makers would have wanted more sonic volume, while lightening the steel. **Lots of booms!**
The input for the pipe is a thin laminar stream of air onto a knife blade. Normal vibrations would get it going, and then the air stream would waver in time to the resonance. I used to do this to scare the tourists on those wobbly suspension bridges, but the secret was to appear to walk perfectly normally. You would sense the motion and swing in time to the waves going back and forth. Such fun!
On a pipe, the air would feed a pulse into the pipe at the right timing. The only thing stopping destruction would be the natural damping of sound energy exiting, and the flow of the air. That point was only found by blowing things up.