Availability Modeling Programs

ARAM (Automated Reliability / Availability / Maintainability) (COSMIC)

Simulation of failures and the possible subsequent repairs of each hardware unit included in the system. Analyzes the effects of failures and repairs on the system and maintains statistics of the system behavior. Simulation can be repeated a specified number of times for each one of the seeds supplied to the random number generator, or can be timed. At the end of a simulation, the program computes the average statistics. 

Avail (Mitchell & Gothier)

Availability modeling package. Performs basic availability analysis. 

AvSim (Item Software)

Quick and easy on-screen entry of Reliability Block Diagrams (RBDs) and the associated block data. Simulation approach allows spares dependencies, wear-out effects and costs to be modeled. 

AvSim+ (Isograph Inc)

A sophisticated Monte Carlo simulation package for analysing systems availability and reliability problems using fault trees or reliability block diagrams. The AvSim+ Monte Carlo simulator engine is the result of 8 years development during the evolution of the AvSim+ product. The simulator enables AvSim+ to model complex redundancies, common failures, ageing and component dependencies which cannot be modelled using standard analytical techniques.

CARE® RBD Basic Model (http://www.bqr.com)

The CARE® RBD module is the ultimate tool for the project management and system engineering personnel for reliability Allocation and reliability Calculation. The RBD tool provides six basic model types that provide engineering personnel with capability to model the functionality of ANY complex system (electronic, mechanical and software).
RBD Basic includes the following item types: Simple, Serial - The block fails when a sub block fails, Parallel - The block fails when all sub blocks fail. All sub blocks operate simultaneously until failure, K out of N - The block fails, when any K sub blocks fail from N, Stand By - The block fails when all sub blocks fail. Only one sub block operates each moment. The rest are spares or in failure.
The software provides the following results:  MTBF\FPMH, Reliability, Availability, Down Time (Hrs),  MTTR (Min).

CARE® RBD Network Model (http://www.bqr.com)

The CARE® RBD module is the ultimate tool for the project management and system engineering personnel for reliability Allocation and reliability Calculation.
The Network Reliability Analyzer helps systems and networks designers to evaluate the Reliability, Availability, and Down Time of the Network, from the concept design to the completion of the full scale development.
The entire network fails only if there are no valid (operational) paths from the Input to the Output. Any network configuration may be build where every sub-block (connection) can be composed from any of the Basic and Markov models. If the network may be split to some sub networks with a  few connections between them, each sub block can be replaced by "multipin" block, simplifying the common solution. Each sub-block can also be composed from any of the Basic and Markov models.
The software provides the following results:  MTBF\FPMH, Reliability, Availability, Down Time (Hrs),  MTTR (Min).

ETARA (Event Time Availability, Reliability Analysis) (COSMIC)

An interactive, menu-driven reliability, availability, and maintainability simulation program. Given a Reliability Block Diagram representation of a system, the program simulates the behavior of a system over a specified period of time using Monte Carlo methods to generate block failure and repair times as a function of exponential and/or Weibull distributions. 

FRANTIC-NRC (Time Dependent System Unavailability) (National Technical Information Service)

Evaluates periodic testing schemes and operational and design modifications and their effects on system unavailabilities and accident probabilities. The instantaneous and average unavailability for any general system model is calculated as well as the breakdown of the unavailability contributions from failures, testing, and repair. The output is a series of tables and plots of the system unavailability contributions. Sensitivity analysis can be performed. 

ICARUS (Redundant System Unavailability Model) (National Energy Software Center)

Calculates the average unavailability, fractional unavailability due to testing, and optimal test interval, and repair and random failures for periodically tested, standby, redundant systems with three different testing strategies. Uniformly staggered, random, and nearly simultaneous test strategies are used. Only one component per redundancy is assumed. Source code is in FORTRAN IV. Inputs include component MTBF and system diagram. 

PC Availability (Markov) (Management Sciences)

Modeling system availability using block diagrams and Markov analysis. Provides a method for studying the influence of alternative failure rates and repair rates, and logistics support on system availability. Outputs include steady state or point in time calculations, double precision calculations, output data extraction and report generation. Allows modeling of dependent failure rates and repair times, sensitivity analysis of component failure rates and repair times. 

PDS-Tool (Sydvest Software)

A user-friendly software tool for carrying out analysis of the reliability and availability of safety systems, e.g. computer-based process safety systems. The tool is an ideal companion for the international standard IEC 61508: Functional Safety of E/E/PE Safety Related Systems, for performing reliability analysis of safety functions. Further, in the Norwegian NORSOK standard for safety and automation systems, the PDS calculation method is referred to as recommended for verification of safety systems

PREDICTOR Deployment Analysis (Management Sciences)

Monte Carlo deployment simulation uses time domain methods. Distributions used as available for confidence, importance, coverage, etc. Permits load sharing, sequenced events, priority events, etc. 

R&MA2T2 (Rel., Maint. and Avail. Analysis and Tradeoff Tool) (Rome Labs)

Automated implementation of many of the reliability, maintainability and availability models presented in RADC's-TR-77-278, "Redundancy Notebook". Inputs include description of block diagram of elec. system and the failure and repair rate of each unique module making up the system. Outputs include block and system operational state, failure rate, availability, and steady state failure rate, MTBF, mean repair rate, and mean-time-to-first-failure (MTTF). 

RAM Commander - RBD  (ALD)

Reliability Block Diagram Module with Monte Carlo Simulation allows to model series, parallel, k-out-of-n configurations.

RAM Commander - SpOpt   (ALD)

Spare Parts analysis and optimization module performs optimization by two criteria:
* Total No Shortage Probability and Availability.
* Cost Availability optimization of repairable and discardable parts for all levels of repair
RAM Commander is the world pioneering software providing everything for reliability prediction & modeling based on one of the prediction models for electronic (MIL-HDBK-217, Bellcore, British Telecom, French Telecom, ItalTel, etc.), as well as mechanical and electro-mechanical equipment . RAM Commander performs additional tasks related to reliability analysis and evaluation: Reliability Allocation, Pareto Analysis, Reliability Growth, Temperature curve, Mission Profile, RBD with Monte Carlo Simulation, Spare Parts Optimization, Maintainability Prediction, comprehensive parts libraries, user-friendly interface and easy to use Import/ Export (including to/from FMECA and FMEA).

RAMP (Rex Thompson & Partners)

An availability simulation program, primarily used for plant and process modeling. Optimizes performance by minimizing down-time and optimizing maintenance schedules. Features include: Element capacity or throughput, standard or user-defined failure and repair distributions for each element, active and standby redundancy, common mode failures, spares and replenishment rules. 

RAMP (Reliability, Availability & Maintainability Programs) (Rome Laboratory)

Capability to perform reliability and maintainability predictions and fault tolerant system reliability analyses from a common front end. RAMP combines three existing RADC programs: ORACLE, TIME, and R&MA2T2. Allows predicted failure rates from ORACLE to be automatically utilized in TIME as input for repair prediction. R&MA2T2 will then automatically use failure and repair rates obtained from ORACLE and TIME as input to conduct fault tolerant system reliability analyses. 

RAP (Reliability and Availability Program) (COSMIC)

Provides reliability, availability, and maintainability analyses for naval shipboard use. Models probabilistic behavior of a set of equipment as a continuous time, homogeneous, discrete state Markov Process. The statistical probability of the system being in a macro state during a mission is computed. These statistics are translated into a measure of system reliability and availability for each mission phase. 

RELAV (Reliability/Availability Analysis Program)

Determines the reliability or availability of any system which can be modeled as embedded k-out- of-n groups of components and/or subgroups. Can access current system performance during the later testing phases of a system design. Can model candidate designs/architect. or validate and form predictions during the early phases of design. Inputs include description of system and one of the following: availability of items, MTBF & MTTR for the items, MTBF & mission lengths, or failure rates and mission lengths. 

RAILS (Reliability, Availability, and Integrated Logistics Support Simulation System)

RAILS is simulation tool for reliability, availability, and logistics support modeling of systems. Systems can be hardware, software, mechanical elements, humans, or combinations of all these. RAILS allows you to describe complex systems easily using its modeling language. The efficient simulation of RAILS gives you detailed reports on the reliability and availability behavior of the system you are modeling.

Relex RBD - Reliability Block Diagram (Relex Software Corporation)

Relex RBD is a powerful graphical Reliability Block Diagram evaluator. You have the ability to model everything from small series subsystems to large systems with complex redundancy schemes. Supported are various failure and repair distributions such as exponential, normal, Weibull, lognormal, and Rayleigh. Relex RBD's powerful built-in Monte Carlo simulation engine provides fast, accurate calculations of reliability, availability, failure rate, and MTBF. Relex RBD also provides an automatic link to the other members of the Relex family of products. Relex is the industry leading R&M software package and incorporates MIL-HDBK-217, Bellcore, and Mechanical Reliability Predictions, graphical Reliability Block Diagrams, FMEAs, FMECAs, Maintainability Predictions, RCM and Life Cycle Cost analyses, and Fault Tree analyses in one completely integrated tool. 

TIGER (Reliability, Readiness, and Availability Measures) (COSMIC)

An aid in the evaluation of a complex system in terms of reliability, readiness, and availability. The system under study can range in complexity from a single piece of equipment, such as a radar or sonar unit, to a complete functional system, such as a ship or an airplane. Monte Carlo simulation techniques are used to provide the analyst with a generalized capability for determining system reliability, readiness, and availability estimates.

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