This paper first shows that two motors on the same plate can enter into synchronization with the phase difference equal to zero, π or 2π depending on the physical characteristics of the motors and the plate. Both motors are considered as non-ideal oscillators and act as external excitation on a specific area of the plate. The analysis of the vibration of the plate indicates through numerical simulation that one can obtain a reduction of vibration when the motors phase difference is equal to π.
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