Quality Control and Reliability Engineering

5.

Reliability Engineering Fundamentals

5.1.

Reliability Metrics and Measures

5.1.1.

5.1.1.1.

Constant Failure Rate

5.1.1.2.

Time-Dependent Failure Rate

5.1.1.3.

Failure Rate Units

5.1.2.

Mean Time To Failure

5.1.2.1.

Non-Repairable Systems

5.1.2.2.

Calculation Methods

5.1.3.

Mean Time Between Failures

5.1.3.1.

Repairable Systems

5.1.3.2.

Maintenance Considerations

5.1.3.3.

Operational Context

5.1.4.

Mean Time To Repair

5.1.4.1.

Maintainability Measure

5.1.4.2.

Repair Time Distribution

5.1.4.3.

Maintenance Planning

5.1.5.

Availability Measures

5.1.5.1.

Inherent Availability

5.1.5.2.

Achieved Availability

5.1.5.3.

Operational Availability

5.1.5.4.

Mission Availability

5.2.

Reliability Functions and Relationships

5.2.1.

Reliability Function

5.2.1.1.

Mathematical Definition

5.2.1.2.

Calculation Methods

5.2.1.3.

Time Dependencies

5.2.2.

Cumulative Distribution Function

5.2.2.1.

Failure Probability

5.2.2.2.

Relationship to Reliability

5.2.3.

Probability Density Function

5.2.3.1.

Failure Rate Distribution

5.2.3.2.

Shape Characteristics

5.2.4.

Hazard Rate Function

5.2.4.1.

Instantaneous Failure Rate

5.2.4.2.

Bathtub Curve Relationship

5.3.

Product Life Characteristics

5.3.1.

5.3.1.1.

Three Life Phases

5.3.1.2.

Failure Rate Patterns

5.3.1.3.

Design Implications

5.3.2.

Infant Mortality Period

5.3.2.1.

Early Failure Causes

5.3.2.2.

Burn-in Procedures

5.3.2.3.

Quality Control Impact

5.3.3.

Useful Life Period

5.3.3.1.

Constant Failure Rate

5.3.3.2.

Random Failures

5.3.3.3.

Operational Considerations

5.3.4.

Wear-Out Period

5.3.4.1.

Aging Mechanisms

5.3.4.2.

Preventive Maintenance

5.3.4.3.

Replacement Strategies

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6. System Reliability Analysis