damped natural frequency การใช้

This is called the damped resonance frequency or the damped natural frequency.
The damped natural frequency is less than the undamped natural frequency, but for many practical cases the damping ratio is relatively small and hence the difference is negligible.
The frequency in this case is called the " damped natural frequency ", f _ d, and is related to the undamped natural frequency by the following formula:
Therefore, the damped and undamped description are often dropped when stating the natural frequency ( e . g . with 0.1 damping ratio, the damped natural frequency is only 1 % less than the undamped ).