Composite Insulator Defect Detection via Controlled Vibration

The patent applies preliminary action by performing the vibration test under a predefined load condition that is applied before the actual vibration measurement. The load application system pre-loads the insulator to a controlled level, ensuring that the structural configuration is stabilized before vibration excitation occurs. This preliminary loading step eliminates the variability caused by unknown tension states during field inspection, allowing consistent vibration response measurements that reliably indicate defects.

The patent applies mechanical vibration by exciting the insulator structure with controlled vibrations after applying the predefined load. The vibration response characteristics (frequency, amplitude, damping) are measured and analyzed to detect defects. This vibration-based approach complements the static mechanical strength test by providing dynamic response information that is sensitive to internal defects, cracks, and bonding issues that do not affect the overall mechanical strength but significantly alter vibration behavior.

The patent applies parameter changes by controlling the load parameter to a specific predefined value before performing vibration measurement. Rather than allowing the load to vary freely, the system adjusts and maintains the load at a predetermined level that optimizes the vibration response for defect detection. This controlled parameter approach ensures that the vibration characteristics are consistent and interpretable, while still allowing the test to be performed in field conditions with operational flexibility.