Forced Vibrations and Resonance Flashcards
1
Q
When do forced vibrations occur?
A
No external force is continuously acting on the system, therefore the system oscillates at natural frequency.
2
Q
What are forced vibrations?
A
System experiences an external driving force which causes it to oscillate, driving frequency is significant.
3
Q
When does resonance occur?
A
If driving frequency is equal to natural (resonant frequency.
4
Q
What is resonance?
A
Amplitude of oscillations of a system drastically increases due to gaining an increased amount of energy from the driving force.
5
Q
Applications of resonance
A
Radio - Electric circuit resonates at the same frequency as desired broadcast frequency.
6
Q
Negative consequences of resonance
A
- Damage to structure like people walking on a bridge, providing a driving frequency close to its natural, it will oscillate violently, could be dangerous.
7
Q
Using damping to decrease effects of resonance
A
As degree of damping increases:
- Resonant frequency decreases
- Max amplitude decreases
- Peak of max amplitude becomes wider
