CRE_可靠性数据搜集及分析

Certified Reliability Engineer.

Ch 8. Data Collection &

Analysis.

Industrial Engineering & Management Systems Research Center.

■ Types of Data.

[CRE Primer Ⅸ p2-3]

Variable Data.

․ Variable data is continuous. This means that the data values can be any real

number, for example, 1.037, -4.69, 84.35.

․ Measured data (variable data) are answers to questions like "how long," "what volume," "how much time" and "how far".

Attribute Data.

․ Attribute data is discrete. This means that the data values can only be integers,

for example, 3, 48, 1029.

․ Counted data or attribute data are answers to question like "how many" or "what kind."

Locational Data.

․ Locational data simply answers the question "where." Chart that utilize locational

data are often called "measles charts" or concentration charts.

■ Censored and Incomplete Data Sets.

[CRE Primer Ⅸ p4-5]

Right Censored.

․ The value of the censored items in the data set are known to be greater than

the censored value.

Left Censored.

․ The value of the censored items in the data set are known to be less than the censored value.

Single Censored.

․ There is only one point at which censoring occurs.

■ Censored and Incomplete Data Sets.

[CRE Primer Ⅸ p4-5]

Multiple Censored.

․ There is more than one point at which censoring occurs.

Time Censored (Type Ⅰ)

․ Testing is ended after a predetermined amount of time.

Failure Censored (Type Ⅱ)

․ Testing is ended after a predetermined number of failures.

■ Reliability Data Sources.

[CRE Primer Ⅸ p6] Reliability Data Sources.

․ Failure analysis records.

․ Failure reports.

․ Reliability group test records.

․ Other test records.

․ Manufacturing results.

․ Manufacturing failure and yields. ․ Installation reports.

․ Corrective maintenance requests. ․ Preventive maintenance logs.․ Repair or warranty actions. ․ Complaint centers.

․ Unit repair logs.

․ Part depot usages.

․ Request for support.

․ Request for upgrades.

․ Customer feedback forms. ․ Customer surveys.

■ Data Collection Methods.

[CRE Primer Ⅸ p7-10]

Objectives of Data Collections.

․ Demonstrate reliability to customers.

․ Demonstrate reliability internally.

․ Validate vendor supplied items.

․ Validate internal process.

․ Enhance product safety.

․ Compare designs.

․ Compare components.

․ Determine competitive performance.