<p>The theory and calculation methodology of active vibration suppression in composite plates using distributed piezoelectric actuators and sensors were developed. A mathematical model describing the response of an orthotropic plate to the impact of piezoelectric film actuators was developed. The possibility of modeling the impact of a piezoelectric actuator on the plate by mechanical moments acting on the actuator boundaries was shown. The equations of motion of orthotropic plates taking into account distributed piezoelectric elements were derived. To model the process of active vibration suppression, a control scheme with feedback on the displacement velocity was considered. Numerical investigation of active suppression of forced harmonic vibrations, as well as vibrations caused by impact load, was carried out on the example of a printed circuit of on-board equipment of an aircraft. Numerical analysis for a printed circuit board with three-dimensional electronic components has been performed in the ANSYS software package using the SOLID 92 finite elements. The performed analysis of the efficiency of active suppression of vibrations indicates a significant reduction (up to 70%) of vibration amplitudes, both in the case of forced harmonic vibrations and in the case of unsteady vibrations after impact loads.</p>