1, audio equipment: * * Vibration plays a key role in audio equipment. Speakers in audio equipment produce sound through vibration. This vibration is driven by the change of electromagnet magnetic field. When the speaker plays audio, when the frequency of the audio signal is the same as the natural frequency of the speaker, the speaker will vibrate with greater amplitude and produce greater sound. This is the application of vibration in audio equipment.
2. Vehicle damping: The damping system of the vehicle uses the vibration principle. When the vehicle is running, the vibration of the vehicle body will be caused by the unevenness of the road surface. This kind of vibration can be absorbed and reduced by the vibration of the damping system, thus improving the ride comfort. The vibration absorption capacity of a damping system depends on its damping coefficient, and the greater the damping coefficient, the stronger the vibration absorption capacity.
3. Magnetic resonance imaging: Magnetic resonance imaging (MRI) is a medical diagnostic technique that uses magnetic resonance phenomena. In magnetic resonance imaging, the detected nucleus vibrates in a magnetic field to generate a signal. By processing and analyzing these signals, an image of the detected tissue can be obtained. Magnetic resonance imaging is widely used in medical diagnosis because of its high resolution and non-invasiveness.
Conditions for generating * * * vibration:
1. Natural frequency of the system: * * * The premise of vibration is that the system has a certain natural frequency. When the frequency of external excitation is the same as the natural frequency of the system, the vibration amplitude of the system will suddenly increase, resulting in * * * vibration. Therefore, the natural frequency of the system is the key factor of vibration.
2. External excitation: * * Vibration needs the existence of external excitation. This excitation can be a periodic force or signal whose frequency matches the natural frequency of the system. When the frequency of external excitation is close to the natural frequency of the system, the system will vibrate greatly, resulting in * * * vibration.
3. Non-linearity of the system: the generation of * * vibration also needs the non-linearity of the system. If the system is linear, then when the frequency of external excitation is equal to the natural frequency of the system, the system will vibrate with the same amplitude without * * * vibration. However, actual systems are often nonlinear. When the intensity of external excitation reaches a certain value, the vibration amplitude of the system will suddenly increase, resulting in * * * vibration.