Structural health monitoring of high voltage electrical switch ceramic insulators in seismic areas

摘要: High voltage electrical switches are crucial components to restart rapidly the network right after an earthquake. But there currently exists no automatic procedure check if these ceramic insulators have suffered earthquake, and method recertify a given switch. To deploy vibration-based structural health monitoring on large shake table able generate accelerations up 3 g was used. The idea underlying SHM proposed here is monitor apparition of cracks in at their early stage through change resonant frequency first mode structure non-linearity that they its dynamic response. Exponential Sine Sweep Method used estimate nonlinear model under test from only one measurement. A classic linear damage index (DI) based variation compared original using ratio amplitudes third harmonic fundamental frequency. Results show both DIs increase monotonically with number solicitations, thus validating use DI. It also shown DI presented seems more sensitive than one.