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No Fault Found and Intermittent Fault Diagnosis Technique for Equipment

LIU Guan-jun;LV Ke-hong;LI Hua-kang;LI Qian;QIU Jing;Science and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology;School of Intelligence Science, National University of Defense Technology;  
No fault found(NFF) is the result of testing when a unit removed as faulty at one level of maintenance is found to be fault free that at the next lower of maintenance. It poses a significant challenge in the field of equipment testing and maintenance. Intermittent fault is the main cause of NFF and the thorny problem in fault detection and diagnosis. The fundamental concepts of NFF and intermittent fault are introduced. Their causes, classifications and influences on equipments are analyzed. The research situations of NFF and intermittent fault diagnosis technology are summarized. The certainty detection trend of intermittent fault is proposed.Finally, the key technologies and development direction in intermittent fault diagnosis field are analyzed.
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