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WHAT'S Q FACTOR

By M. Nurkholis

We often burdened by various terms, let's call it the term Q Factor. It would be a burden if we do not track it. If we trace the engineers often use the terminology of the quality of damping (damping quality) as a Q factor that is used to describe the amount of damping in sistyem reosnansi. When an object or a system is said to have good damping, low value of Q must aka close to 1. Most of the low Q value is found in the design of the speaker box. Panel speaker box also often use the Q with a value of about 10 for medium damping. The larger the Q value, the higher the intensity (amplitude) and the more obvious forms of resonance (sharper), and more pangjang their natural oscillations.

A low Q value in a system will experience a rapid decay in the frequency resonance. So damping is highly correlated with the resonance.

What is called resosnansi simple fact, the tendency for mechanical or electrical system to vibrate at certain frequencies when triggered by external force. Tendency to vibrate it is still there despite the trigger is not there. Resaonansi can be caused by several forms, including the electrical, mechanical and acoustic or a combination of them. Examples of resonance are wind instruments, such as flutes. Because blown (acoustic) cause resonance in distilled giving rise to noise. String instruments, such as classical guitar is a combination of mechanical and acoustic resonance.

When an object resonance controlled by external source of energy, then this resonance is called the forced vibration. Meanwhile, vibration after external energy source that triggered it is no longer in control, then the object is in a state of free vibration. Under conditions of free vibration system most likely to move in their natural condition or called resonance frequency. The resonant frequency will be reduced because of certain damping, either because the energy dissipation and in the face of the acoustic impedance Most musicians receipts a regulator overdamping duration of a tone that can be reproduced vary.

When we hit the fork, we blow causing a tuning fork vibrates at a natural frequency or resonance frequency. The length of the resonance is strongly influenced by pangjang fork, thickness and material. Power punches (external force) also affects friction and gravity average natural vibration. Basically, what we hear from the musical instrument is a combination of various resonance and harmonics or overtones. Setting this tone that makes the sound becomes bad we hear as music.

In electrical terminology, the resonant circuit is often referred to as "Q" or quality damping. Damping refers to how long the sound generating natural frequency of maximum intensity decayed to a minimum. Value "Q" measure shape resonance circuit. Value "Q" indicates a high damping low ,, a low Q value indicates a high damping.

In the circuit always occur loss presented by the use of energy dissipation components or resistance (R). This energy loss occurs due to friction, dielectric losses, or lost by other forms. Thus, the resistance which controls the amount of damping. The greater the damping effect or resistance, then more rapidly oscillating resonance that energy consumption is reduced close to zero.

The relationship between quality damping Q with capacitance and inductive reactance (X) and resistance is expressed in the formula Q = X / R. Therefore Q is only a figure that does not have a unit. This formula means that the greater the lower the dampingnya then intensitansya so that the resonant frequency of imminent decay.

 To assess the sound is not only dependent on dampingnya factor alone but also its resonance frequency. The formula used to determine the resonant frequency, if the value kapasistansi (C) and inductance (L) is known, Frequency = 2 pi times the square root of L C. Therefore, if we change the R, L and C will shift the resonant frequency to others and change dampingnya (Q). So ,, it turns out the Q factor of no more than just the reduction of quality problems.

 
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