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	Prognostik och prediktion av återstående livslängd (RUL)	Highly Accelerated Life Testing (HALT)
Ämnesområde	Tillförlitlighetsteknik	Tillförlitlighetsteknik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	2000s	1990s
Upphovsperson	George Vachtsevanos and others	William Leis and others
Typ	Predictive analytics methodology	Product reliability testing methodology
Ursprungskälla	Vachtsevanos, G., Lewis, F. L., Roemer, M., Hess, A., & Wu, B. (2006). Intelligent Fault Diagnosis and Prognosis for Engineering Systems. Wiley.	Leis, B. N., & Stephens, D. R. (2011). Reliability methodologies for structural integrity assessment. Journal of Pressure Vessel Technology, 133(5), 051204.
Alias	RUL, Remaining useful life, PHM, Prognostics and Health Management	HALT, Accelerated stress testing, HASS
Närliggande	4	4
Sammanfattning	Prognostics and Health Management (PHM) is a methodology for predicting the remaining useful life (RUL) of equipment by monitoring its condition and extrapolating degradation trends. Unlike reactive maintenance (wait for failure) or preventive maintenance (fixed schedules), prognostics enable predictive maintenance: act only when failure is imminent. Formalized in the 2000s by researchers including George Vachtsevanos, RUL prediction integrates sensor data, degradation models, and uncertainty quantification to inform maintenance planning and reduce downtime.	Highly Accelerated Life Testing (HALT) is a methodology for rapidly identifying design weaknesses and determining the margin between normal operating conditions and product failure. By applying extreme but non-destructive stress profiles (thermal, vibration, etc.), HALT accelerates the failure clock to reveal latent defects in weeks rather than years. Developed intensively from the 1980s onward and refined by practitioners in electronics and mechanical systems, HALT has become essential in accelerated product development and reliability validation.