Reliability Modeling

Reliability Modeling


While the benefits of the design for reliability (DFR) process are well understood in the engineering community, the application of these techniques becomes quite difficult as modern systems continue to evolve into increasingly complex designs. One of the most effective means of overcoming these challenges is the use of system modeling techniques. Such models simplify many of the design analyses by allowing analysts to address smaller, more manageable collections of parts and assemblies, as opposed to considering the entire system as a whole.

*Available as a PDF Download File Only

Product Description

The series name has a double meaning:
(1) the spelling of the name r-e-l-e-a-s-e indicates that the series is intended to “release“ the non-expert down the path to reliable products and
(2) the complementary terms “REL” with “ease”, implying the series goal of “reliability made easy.”

Of course, reliability success is seldom easy, requiring expertise and tailoring with tradeoffs addressing life-cycle costs and other issues, but we hope that the series will help those not familiar with reliability practices understand the basics.

While it is unlikely that the reader will become an instant expert in reliability by reading the RELease guides, it is likely that he/she will gain a better appreciation of the basic tools that lead to designing and building reliability into products and systems. The number of pages in each guide is intentionally limited to address only the basics, with comprehensive authoritative references listed for those wanting to know more. The initial set of guides will be continuously expanded in the future. Please let us know how the series can be improved to meet your needs in introducing reliability to the non-expert, or suggest other topics you would like to see developed.

Additional information

File Type:



Alex MacDiarmid





Publication Date:

July 2013

Table of Contents

1. How is Reliability Modeling Useful?       2
2. Reliability Modeling Terminology       3
3. The Modeling Process       4
  3.1 Required Inputs     5
  3.2 Process Flow     6
  3.3 Additional Reliability Models     8
4. Reliability Modeling Techniques       10
  4.1 Reliability Block Diagrams     10
    4.1.1 Series System Models   11
    4.1.2 Parallel System Models   12
    4.1.3 Standby Parallel System Models   13
    4.1.4 M-out-of-N Redundancy   14
    4.1.5 Bridge-Type Networks   14
    4.1.6 Dependent Failures   16
  4.2 Fault Tree Diagrams     17
  4.3 Markov Modeling     20
5. Examples       21
  5.1 System-Level Prediction Methods     22
    5.1.1 Alternative Prediction Techniques   24
6. For More Information       27

You may also be interested in…