Abstract: Disclosed are a method and device for evaluating damage caused by secondary stress to a vacuum vessel, a terminal device, and a medium, to perform following steps: obtaining secondary stress of a vacuum vessel that passes a primary-stress failure evaluation; obtaining structural damage parameters of the vacuum vessel when determining, based on evaluation parameters for the primary-stress failure evaluation of the vacuum vessel and the obtained secondary stress, that the vacuum vessel meets a precondition for a progressive deformation; and determining, based on the obtained structural damage parameters, whether the vacuum vessel meeting the precondition for the progressive deformation experiences structural damage due to the progressive deformation. In this way, a vacuum vessel of a nuclear fusion reactor can be evaluated based on damage caused by the secondary stress.

Abstract: A piezoelectric speaker driving device includes a driving amplification unit, a signal tuning unit, and a piezoelectric speaker; wherein, the driving amplification unit is configured to amplify a signal source, and transmit an amplified signal to the signal tuning unit; the signal tuning unit is configured to filter the amplified signal to filter out a high-frequency noise, and regulate an impedance characteristic of the piezoelectric ceramic to increase a load impedance of a high-frequency part of the driving circuit so as to reduce the driving current of the high-frequency part, and transmit the regulated driving signal to the piezoelectric speaker to drive the piezoelectric speaker. Wherein, the signal tuning unit may include a low-pass filtering circuit and a regulation impedance.