Design of Aircraft Cable Fault Diagnose and Location System Based on Aircraft Airworthiness Requirement

摘要

Aircraft cable have the special status in aviation domain, with the improvement of aircraft performance requirements, the amount of the single wire is also increasing gradually. Demanding of its performance and maintaining is increasingly day by day. An aircraft cable fault diagnosis and location system based on Phase Detection Frequency Domain Reflectometry (PDFDR) is presented in this paper, which is used to diagnose and locate the special aircraft cable faults, such as intermittent fault, continuous fault and cross-connect fault. With the threshold denoising method on Hilbert Huang Transform, the studied approach is developed to detect and locate aircraft cable "hard defects" (i.e. opens and shorts) based on Phase Detection Frequency Domain Reflectometry (PDFDR). By analyses the differences of amplitude and phase in superimposed signal which from the incident signal and the reflected signal on defects, the shortage of Phase-Detection Frequency Domain Reflectometry (PDFDR) simply using in locating aircraft cable defects is solved. Utilizing the strong calculating capability and the abundant function library of MATLAB, the signal processing turn to be easily realized, moreover Lab VIEW help the system to be more reliable and updated easily.