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Reliability Software, Safety and Quality Solutions / Services / Reliability Services

Reliability, Availability, Maintainability, Safety Services

Reliability and Maintainability Program Plan
Reliability Allocation, Prediction & Analysis
Reliability Models
Failure Mode Analysis
Testability Analysis
Fault Tree Analysis
R & M Test Planning

Reliability, Availability, Maintainability and dependability

RMA are our bread and butter. Our experts will be happy to support the planning, requirements definition, allocation as well the analyses and engineering tasks.  We can support your RMA team if you have one, or manage the program entirely. Either way, we guarantee peace of mind.

Our team are involved not only in traditional consulting but also are in the forefront of R&D efforts in the fields of RMA engineering and RMA methodology and tool development. We can therefore analyze your system and requirements using best current practices and propose the most effective path to completing the RMA tasks. 

Reliability & Maintainability Program Plan                                                                  

To ensure reliability goals are met, at the lowest cost, requires a comprehensive R&M program plan that includes all lifecycle phases. The plan defines all the tasks and organizational structure needed to satisfy the RMA requirements and constraints for each stage of product lifecycle. A good R&M plan includes not only an understanding of reliability and maintainability engineering practices, it requires a good understanding of your system: the physical elements and processes that may influence R&M metrics, planned usage and customer requirements and constraints. Our team includes R&M engineers, physicists, mathematicians able to model complex systems, as well as safety engineers that can review the plans and include required safety input.  

Reliability Allocation, Prediction & Analysis                                         

SoHaR's reliability experts have performed hundreds of reliability predictions and analyses that have formed the basis for reliability assessments, allocation and design changes.  Our team performs reliability prediction for electronic and non-electronic parts according to any of the existing reliability standards and manufacturer in-house data. Reliability calculations are based on electrical/thermal stress analysis. The output is a report with a breakdown of MTBF and MTBCF numbers per system, unit, board and component levels.

See also the RAM Commander Reliability prediction module.

Reliability Prediction Methods

  • MIL-HDBK-217

  • 217 Plus

  • SR332 - Telcordia 2001

  • RDF 95 - French Telecom

  • IEC 62380 (RDF 2003)

  • UTEC 80810 - (CNET 2000)

  • FIDES Guide 2004

  • SN29500.1 - Siemens

  • HRD - British Telecom


  • RADC 85-91

  • NSWC 98

  • GJB299 - Chinese Reliability

  • GJB 1391,1392 - Chinese FMECA

  • CJB/Z35 - Chinese Derating

  • Stress/Strength

For more information about these methods please also see reliability prediction for electronic and non-electronic parts.

Reliability Models                                                                               

Often we will be required to develop a reliability model that can accurately and completely take into account fault tolerance, recovery, redundancy and degraded states. We use such methods as Reliability Block Diagrams (RBD), Markov models and Petri Nets, as well as Monte Carlo Simulations. For most systems, information about availability can only be obtained from a well developed reliability model that includes also recovery and repair information. 

Analysis of the models provides outputs including: Reliability, Availability (including degraded states, partial availability, and average downtime) as well as MTBF and Mean Time Between Critical Failures (MTBCF).

See also the RAM Commander Reliability Block Diagram and Markov Chains modules.

Failure Mode Analysis                                                                    

Failure Mode and Effect Analysis (FMEA) is an engineering technique for systematic identification and elimination/mitigation of known and/or potential problems of a system. The FMEA lists all known failure modes and analyzes them for their potential effects.  

Failure Mode and Effects Criticality Analysis (FMECA) allows us to focus on the critical failure modes and analyze their probabilities of occurrence. FMEA is an ongoing process that should start as early as the first design review and continue throughout the life of the product. An FMEA will usually evolve into a FMECA once design details solidify and the accuracy of prediction will increase when testing and field data can be added at later stages.

SoHaR's reliability team will follow your product lifecycle to ensure an effective FMECA according to the MIL-STD-1629A requirements, and process/design FMEA fully compliant with QS 9000 guidelines.

See also the RAM Commander FMECA and Design/Process FMEA modules.


Testability Analysis                                                                             

Testability analysis is a widely used method for the evaluation of qualitative and quantitative characteristics of BIT/BITE design, such as Fault Detection probability, BIT coverage, Fault Isolation resolution and False Alarm probability. SoHaR's R&M and safety engineers performs testability analysis in conjunction with FMECA. When reviewed and analyzed in conjunction with  the FMECA the focus is on how well the BIT/BITE design deals with severe failure modes, and the context is naturally safety-oriented.  


Fault Tree Analysis                                                                             

Fault tree analysis (FTA) is a systematic, deductive, top-down method of analyzing system design and performance. It involves specifying a top event to analyze (such as catastrophic system behavior), followed by identifying all of the associated elements in the system that could cause that top event to take place. It clearly identifies fault relationships and provides a clear approach for predicting the probability that a top-level event will occur. The results of a FTA provide crucial input to the Reliability analysis as well as to Safety assessments and Probabilistic Risk Assessments (PRA)

Fault Trees provide a convenient symbolic representation of the combination of events resulting in the occurrence of the top event.

SoHaR has performed FTA on a large variety of systems and has experience not only in accomplishing the analysis but also identifying the crucial elements requiring the analysis.

See also the RAM Commander Fault Tree Analysis (FTA) module and Event Tree Analysis (ETA) module.

Reliability & Maintainability Test Planning                                    

Efficient and cost-effective R&M test strategies are essential for the achievement of R&M design and performance goals. The SoHaR R&M team of experts will establish an R&M test planning strategy that will include the types of tests, test schedule, amount of risk to be tolerated, while taking into consideration schedule and budget constraints. 


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