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On the whole you can see three different types of behaviour:
If the exciter's frequency is very small (this means that the top of the spring pendulum is moved very slowly), the pendulum will oscillate nearly synchronously with the exciter and nearly with the same amplitude.
If the exciter's frequency agrees with the characteristic frequency of the spring pendulum, the oscillations of the pendulum will build up more and more (resonance); in this case the oscillations are delayed about one fourth of the oscillation period compared with the exciter.
If the exciter's frequency is very high, the resonator will oscillate only with a very small amplitude and nearly the opposite phase.
If the constant of attenuation (the friction) is very small, the transient states will be important too; therefore you have to wait some time in this case to notice the mentioned types of behaviour.
This applet is based on formulas which look rather complicate. If you don't like mathematics, you should click here under no circumstances.
Physics Applets (Overview) |
URL: http://home.a-city.de/walter.fendt/physengl/resonance.htm
© Walter Fendt, September 9, 1998
Last modification: February 25, 2000