Knowra Reliability engineering Reliability engineering Reliability engineering predicts, assesses, and improves the probability that systems perform their intended functions without failure over specified conditions and periods.
Failure rate : The frequency of failures per unit of exposure, such as operating time, under stated conditions. Failure rates quantify how often components stop working and help estimate system reliability.
Reliability : The probability that an item performs a required function under stated conditions for a specified period. This is the central quantity reliability engineering seeks to predict and improve.
Failure mode and effects analysis : A structured method for listing potential failures, their causes, and their effects on a system. FMEA helps teams prioritize design changes before failures occur in service.
Quality engineering : The discipline of designing and controlling processes so products and services meet specified requirements. Quality focuses on conformance and variation, while reliability emphasizes performance across time and use.
Hazard function : A function giving the instantaneous failure rate at a given time, conditional on survival until then. It captures changing failure risk, including early-life and wear-out behavior.
Failure mode : The specific way in which a component or system fails to perform its required function. Identifying failure modes makes reliability analysis concrete and testable.
Accelerated life testing : Testing that exposes products to elevated stress to obtain lifetime evidence faster than normal use allows. It estimates long-term reliability when ordinary-duration tests would be impractical.
Safety engineering : The discipline of identifying and controlling hazards to prevent injury, damage, or environmental harm. A system can be reliable yet unsafe, or fail often without creating severe hazards.
Weibull distribution : A probability distribution used to model lifetimes with increasing, decreasing, or constant failure rates. Its shape parameter lets engineers represent distinct patterns of component failure over time.
Mean time between failures : The average operating time between successive failures of a repairable system. MTBF summarizes repairable-system behavior, though it does not by itself describe lifetime distributions.
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