Advantage and disadvantage of resonance

[kindaichi]

I have always been wondering,what is the advantage and disadvantage of resonance.I am currently studying it right now,and i do know it had caused a bridge to collapse before.

 

[russ_watters]

It depends on the application. In a radio antenna it's a good thing, in a bridge it typically is not.

 

[Claude Bile]

Resonances are typically frequencies where energy is easily coupled into the system. Depending on the application, this easy coupling of energy can be good or bad.

When we want to couple energy into a system, say in the case of an antenna, resonances are desirable, whereas if we want do dampen out energy in the case of anti-vibration table, resonances are bad news. Sometimes systems can exhibit multiple resonances, which is usually a bad thing no matter what, because a system that is jumping between resonances is usually rather unpredictable. Any multimode laser is a good example of where this occurs.

Claude.

 

[rbj]

It depends on the application. In a radio antenna it's a good thing, in a bridge it typically is not.

oh c'mon, Russ. it makes for great entertainment!

http://video.google.com/videoplay?docid=-3932185696812733207
http://video.google.com/videoplay?docid=8849554834285920420
http://video.google.com/videoplay?docid=7836010763965729158

how can that not be good?

resonance is always good.