Mechanism analysis and dynamic model construction of intermittent fault of weak-current aviation cable under vibration stress

Abstract

Aviation cables are widely used in modern avionic devices, and are called the “vessel” of electronic equipment. As the stress environment of modern avionic devices become more complex, the intermittent fault of aviation cables under the vibration stress has received more attention. Aiming at the analysis of the mechanism of intermittent fault and the construction of dynamic models, the relationship between cable damage changes and DC resistance in the absence of vibration stress was analyzed. On this basis, the mechanism of intermittent fault of weak-current cable under vibration stress was analyzed by comprehensively considering the effect of vibration stress. Combined with the test data, the dynamic model of intermittent fault of fully damaged cable and conductor-damaged cable under vibration stress was constructed. Finally, two types of dynamic models were experimentally verified. The results indicated that the dynamic model of the weak-current cable under the vibration stress could well reflect the dynamic characteristics of its intermittent fault and that the performance of cables with different damage states under vibration stress are obviously different.