Getaran: Perbedaan antara revisi
Konten dihapus Konten ditambahkan
k Bot: Perubahan kosmetika |
k Bot: Perubahan kosmetika |
||
Baris 171:
The phase of the FRF was also presented earlier as:
:<math>\angle H(\omega)= \arctan {\left (\frac{2 \zeta r}{1-r^2} \right)}.
For example, let us calculate the FRF for a mass-spring-damper system with a mass of 1 kg, spring stiffness of 1.93 N/mm and a damping ratio of 0.1. The values of the spring and mass give a natural frequency of 7 Hz for this specific system. If we apply the 1 Hz square wave from earlier we can calculate the predicted vibration of the mass. The figure illustrates the resulting vibration. It happens in this example that the fourth harmonic of the square wave falls at 7 Hz. The frequency response of the mass-spring-damper therefore outputs a high 7 Hz vibration even though the input force had a relatively low 7 Hz harmonic. This example highlights that the resulting vibration is dependent on both the forcing function and the system that the force is applied to.
| |||