Abstract
Intermittent faults are completely missed out by traditional monitoring and detection techniques due to non-stationary nature of signals. These are the incipient events of a precursor of permanent faults to come. Intermittent faults in electrical interconnection are short duration transients which could be detected by some specific techniques but these do not provide enough information to understand the root cause of it. Due to random and non-predictable nature, the intermittent faults are the most frustrating, elusive, and expensive faults to detect in interconnection system. The novel approach of the author injects a fixed frequency sinusoidal signal into electronics interconnection system that modulates intermittent fault if persist. Intermittent faults and other channel effects are computed from received signal by demodulation and spectrum analysis. This paper describes technology for intermittent fault detection, and classification of intermittent fault, and channel characterization. The paper also reports the functionally tests of computational system of the proposed methods. This algorithm has been tested using experimental setup. It generate an intermittent signal by external vibration stress on connector and intermittency is detected by acquiring and processing propagating signal. The results demonstrate to detect and classify intermittent interconnection and noise variations due to intermittency. Monitoring the channel in-situ with low amplitude, and narrow band signal over electronics interconnection between a transmitter and a receiver provides the most effective tool for continuously watching the wire system for the random, unpredictable intermittent faults, the precursor of failure.
Highlights
An intermittent fault (IF) is an electrical spike that develops from ageing of electric interconnects, cuts, rubs, or loose contacts, and manifests itself intermittently in an unpredictable manner
No Fault Found (NFF) can be overcome by using in-situ health monitoring algorithm to check it for abnormalities in the interconnection system
Frequency, and phase variation has been extracted by amplitude modulation (AM), frequency modulation (FM) and phase modulation (PM) modulation schemes, which gives intermittent channel information
Summary
An intermittent fault (IF) is an electrical spike that develops from ageing of electric interconnects, cuts, rubs, or loose contacts, and manifests itself intermittently in an unpredictable manner. Slightly different use of spread spectrum was reported from the research result of on detecting live wire problems [9] These techniques work on reflectometry, and it solves the need to use low voltage signal, that does not interfere with online signals and could be used in-situ, but still there is a problem of reflection occurring at all points of interconnections in the circuit. The new approaches of the author send a sinusoidal carrier to interconnecting system and demodulate the received signal from interconnection channel for IF detection and feature extraction to find the root cause of problem This could be used for multipoint of electrical/ electronic interconnection system and diagnose the health status of the wire after dedemodulation to retrieve an intermittent signature of channel. Following section describes the results and validations of algorithm last section concludes this paper
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