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FMEA
Failure Mode and Effects Analysis is a systematic risk assessment method used to identify potential system failures and prioritize prevention measures.
Failure Rate (λ)
The probability that equipment or a component will fail within a given time interval, conditional on it having functioned until the start of that interval.
MTBF (Mean Time Between Failures)
The average time elapsed between two consecutive failures of a repairable system, a key indicator of its reliability and operational availability.
MTTR (Mean Time To Repair)
The average time required to repair a failure and restore the system to operational condition, including diagnosis, intervention, and recommissioning.
Bathtub Curve
A reliability model illustrating the evolution of equipment failure rate throughout its life cycle, characterized by three phases: infant mortality, useful life, and wear-out.
Criticality Index (CI)
A numerical score resulting from the product of severity, occurrence frequency, and non-detection probability of a failure, used to prioritize maintenance actions.
Pareto Chart
A statistical analysis tool applied in maintenance to identify and visualize the 20% of failure causes responsible for 80% of downtime.
Reliability (R(t))
The probability that a system will perform its required function without failure, under defined conditions, for a specified period of time.
Maintainability
The ability of an asset to be maintained or restored to a state where it can perform a required function, when maintenance is performed under given conditions.
Availability
The ability of an asset to be in a state to perform a required function under given conditions, at a given time or during a given time interval.
Failure Mode
The manner in which a component or system ceases to perform its function, for example by ceasing to operate, operating in a degraded manner, or exhibiting untimely operation.
Failure Effect
The consequence of a failure mode on the operation, performance, or safety of the system, as perceived by the operator or end customer.
Root Cause Analysis (RCA)
A systematic method for identifying the fundamental and underlying causes of a failure, in order to implement lasting corrective solutions rather than temporary fixes.
Weibull Distribution
A statistical probability distribution widely used in reliability engineering to model the time until first failure of equipment, thanks to its flexibility in representing different life phases.
Vibration Analysis Diagnostics
A condition monitoring technique that measures machine oscillations to detect anomalies such as imbalance, bearing defects, or mechanical looseness.
Infrared Thermography
A non-destructive inspection method that uses infrared radiation to visualize temperature profiles and identify abnormal overheating, which are signs of electrical or mechanical failures.
Oil Analysis
Predictive maintenance technique involving the analysis of the physicochemical properties and particles contained in lubricating oil to assess the health status of equipment.
Degradation Model
Mathematical or statistical representation of the evolution of an asset's condition over time, used to predict its remaining useful life and optimize intervention scheduling.