What's quality factor in oscillation ?

[abcdefg10645]

What's "quality factor" in oscillation ?

I want to know why and how it was defined ?

Is it useful in some ways ?

 

[f95toli]

Quality factor ("Q") is only useful for damped oscillations; it is basically measure of how long it takes for the oscillation to die out or -equivalently- how narrow the oscillation is in frequency space (e.g a very "selective" filter has a high Q value).

have a look at this page
http://www.fonema.se/qval/qval.htm

And yes, it is used a lot.

 

[charng]

The quality factor, also known as Q factor, is a measure of the efficiency of an oscillating system. It is defined as the ratio of the energy stored in the system to the energy dissipated per cycle. In other words, it represents the ability of the system to maintain its oscillations without losing energy.

The concept of quality factor was first introduced in the field of electrical engineering, specifically in the study of resonant circuits. It has since been applied to various other systems, such as mechanical, optical, and acoustical oscillators.

The quality factor is a useful parameter in many ways. It can be used to compare the performance of different oscillators and determine the most efficient one. It also provides information about the stability and bandwidth of the oscillating system. In addition, the quality factor is important in the design of filters and other electronic devices that rely on oscillations.

The quality factor is a fundamental concept in the study of oscillations and plays a crucial role in many scientific and technological applications. Its definition and usefulness have been well-established and continue to be studied and utilized by scientists and engineers in various fields.