The car generator is driven by a belt. Smooth generator loading allows for smooth transmission. If the load exhibits vibration, the voltage reflected from the generator rotor connection to the belt will also vibrate, and ultimately the vibration of the generator body will be reflected. This type of situation is more likely to occur when the generator load is a high power speaker.
The reason can be found in two aspects. On the generator side, the load may be unbalanced. If the loads are all 380 volts there will be no problem, but the 220 volt load is connected. to a line. Once installed, the diesel engine will have difficulty operating and the situation you mentioned will occur: the device will vibrate violently (it takes three ammeters to check if it is unbalanced). You can also check if there are two types of electricity that work, that isi.e. fire 101, which can be changed to A0, B0, C0, and the balance will be fine. Another point is that the feet are loose and the load is too great, causing jumping.