Device for real-time monitoring and early warning of bridge based on foldable triboelectric nanogenerators

A device for real-time monitoring and early warning of a bridge based on foldable triboelectric nanogenerators, comprising:

• a signal generator comprising an internal unit and an external unit, wherein the internal unit is inserted into the external unit,
• a data acquisition and transmission module, and
• a data processing and early warning module,
• wherein the signal generator, the data acquisition and transmission module, and the data processing and early warning module are sequentially connected,
• wherein the external unit comprises:
• a device sidewall,
• a lower sleeve fixed in the device sidewall, and
• a lower magnet fixed at a bottom of the lower sleeve,
• wherein a plurality of vertical grooves are provided at an upper section of the lower sleeve, and
• wherein the internal unit comprises:
• a cover plate,
• an upper magnet,
• an upper sleeve, and
• a flexible multilayer triboelectric nanogenerators, and
• wherein the flexible multilayer triboelectric nanogenerators is inserted into a gap between the lower sleeve and the device sidewall, the cover plate is arranged at an upper end of the flexible multilayer triboelectric nanogenerators, and the upper sleeve is fixed at a middle position of the flexible multilayer triboelectric nanogenerators through a bracket, the bracket is matched with the plurality of grooves at the upper section of the lower sleeve, the upper sleeve is inserted into the lower sleeve to form a sliding connection;
• and the upper magnet is fixed at a bottom of the upper sleeve, wherein two materials with opposite polarities are provided between an upper surface and a lower surface of adjacent layers of the flexible multilayer triboelectric nanogenerators, and two materials with opposite polarities are provided between a side wall of the flexible multilayer triboelectric nanogenerators and the device sidewall, wherein the flexible multilayer triboelectric nanogenerators comprises a multilayer flexible structure that is elastic and extendible, and wherein two materials used in the flexible multilayer triboelectric nanogenerators are copper and nylon, and the flexible multilayer triboelectric nanogenerators is designed to be multilayer and extendible,
• wherein when the internal unit is subjected to axial vibration, the internal unit slides downwards along an axis through the cover plate to squeeze the flexible multilayer triboelectric nanogenerators, in such a manner that an upper surface and an lower surface of the flexible multilayer triboelectric nanogenerators with opposite polarities are subjected to contact separation motion to generate a voltage signal, and
• wherein when the internal unit is subjected to radial vibration, the cover plate shakes left and right along a radial direction, in such a manner that a side wall of the flexible multilayer triboelectric nanogenerators and the device sidewall are subjected to contact separation motion due to opposite material polarities to generate a voltage signal.