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Forced SelfSustained Oscillator 
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#1
May810, 02:11 PM

P: 203

Hi,
I'm reading about selfsustained oscillators under the influence of harmonic forcing. The topic is introduced by studying the system in a new reference frame; one which rotates in the same direction with the frequency of the of the external force. In this new reference frame, the oscillating force is represented by a constant vector, acting at some angle. (see pg 48 Synchronization) At first glance, I thought the concept was trivial, but now I'm having a very hard time understanding why this would be so. Can anyone shed some light on this topic? Thanks ps. consider this... A stationary point in this reference frame is one which is oscillating in the original reference frame, with the same frequency as the force. The force on such a point is then said to be constant. However, to my understanding, the force in the original reference frame varies with time, indifferent of the objects position!! 


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