Appendix A: General Notation

Notation

• A(·), Point Availability

• Am(·), Mean Availability

• ALT, Accelerated Life Tests

• β, Weibull Shape Parameter

• C(R), Cost as a Function of Reliability

• cdf, Cumulative Density Function

• CM, Corrective Maintenance

• CPU, Cost per Unit Time

• Expected NOF, Expected Number of Failures

• Expected NOPM, Expected Number of Preventive Maintenance Actions

• EPPA, End of Phase Point Availability

• FT, Fault Tree

• FTA, Fault Tree Analysis

• η, Weibull Scale Parameter

• f, Feasibility of Improvement

• f(·), Probability Density Function, pdf

• Γ(·), Gamma Function

• γ, Location Parameter

• iid, Identical Independent

• λ, Exponential Parameter (Failure Rate)

• λ(·), Failure Rate

• μ, Mean

• M(·), Maintainability

• MTBF, Meant Time Between Failures

• MTTF, Mean Time To Failure

• MTTFF, Mean Time To First Failure

• N.E.P.U., Number of Equivalent Parallel Units

• P, Probability

• pdf, Probability Density Function

• Pf, Probability of Failure

• PM, Preventive Maintenance

• PS, Probability of Success

• Q(·), Unreliability

• R(·), Reliability

• RG, Reliability Goal

• Rmax, Maximum Achievable Reliability

• Rmin, Minimum Reliability

• RS(·), System Reliability

• RBD, Reliability Block Diagram

• RPD, Reliability Phase Diagram

• RS ACI, ReliaSoft's Aborted Criticality Index

• RS DECI, ReliaSoft's Downing Event Criticality Index

• RS FCI, ReliaSoft's Failure Criticality Index

• σ, Standard Deviation

• s-id, Statistically Independent

• s-independent, Statistically Independent

• s-iid, Identical Statistically Independent

• , Normal Cumulative Distribution Function

• , Standard Normal Density Function

Symbols

• , Union

• , Intersection

• , Summation

• , Product

• , Estimate

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