"El Enrrabadore-mor" wrote in message

"Greg Neill" escreveu na mensagem
m...
"El Enrrabadore-mor" wrote in message

"Greg Neill" escreveu na mensagem
m...

Can you expound upon the Q-factor of a resonant
circuit (or mechanical oscillator)?

Sure, the quality factor Q has no precise definition, but
basically is a measurement (or calculation) of the
sharpness of the oscillator.
Q = natural frequency / damping.

No, it has a very specific definition:

2*pi*(energy stored)/(energy dissipated) [per cycle]

That's from the EXTERNAL point of view.
Not the resonator INTERNAL point of view.

Nonsense. You know not of which you speak.



The smaller the damping the smaller the bandwidth
and larger the Q-factor will be (the larger the
sharpness of the oscillator).

"Larger the sharpness"? That's horrible, imprecise
word salad. Still, how do you reconcile your idea
that at resonance there is no energy loss to the fact
that resonant systems have a Q-factor?

Look at a mass-spring system without friction.

Ideal case (does not exist in the real world);
Infinite Q.

Friction is EXTERNAL to the system here,
as usual.

No, in the ideal case there is *no* friction.
In the real world all materials exhibit friction
upon flexure, no inductor is without some
non-inductive impedance whether resistive or
capacitive, or capacitive and inductive coupling
to its environment.


The mass-spring system oscillates at its natural
frequency forever, if no damping exists.
Damping is EXTERNAL.

Unadulterated crap. Show me a real-life material
of which a spring could be constructed that exhibits
no energy loss when flexed. Similarly, show me a
mass that doesn't at least radiate gravitational
waves as it oscillates as a spring-mass system!