Random failures Random failures exhibit constant failure rate characteristics; that is, a random failure is just as likely to occur in the first year of operation as it is in the second or third years of operation. Random failures exhibit no infant mortality or wear-out characteristics. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Random On property in AWB. See Also MTTF for random failures Estimate of the average, or mean time, until an asset’s first failure occurs. See Also Failure rate APM automatically calculates the failure rate as the inverse of the MTTF. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s random rate property in AWB. See Also Wear out Age-related failures that occur due to operational wear. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Wear out On property in AWB. See Also Wear out begins at The operating age at which wear-out begins. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Wear out Start age property in AWB. See Also Majority will have failed by How long after the wear-out period begins that the majority of assets of this type will have failed. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Wear out Duration property in AWB. See Also Infant mortality Rate of failure during the period immediately following an asset’s commissioning for service. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Infant On property in AWB. See Also Infant mortality period The length of time immediately following an asset’s commissioning for service until it reaches its useful life period. The infant mortality period is characterized by a progressive improvement in the failure rate. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Infant period property in AWB. See Also MTTF during infant mortality period Estimate of the average, or mean time, until an asset’s first failure occurs during the infant mortality period. See Also Failure rate APM automatically calculates the failure rate as the inverse of the MTTF during the infant mortality period. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Infant Rate property in AWB. See Also
