RBD Project

Developer’s Description

RBD Project

By Download Database Software
RBD Project provides both business and personal users with all of the tools they need to manage project schedules, costs, and resources. RBD Project was designed to help both business and personal users manage almost any kind of project by taking control of project timelines, returns and expenses, resources and contacts, and documents and photos associated with each project

RBD Project provides both business and personal users with all of the tools they need to manage project schedules, costs, and resources. RBD Project was designed to help both business and personal users manage almost any kind of project by taking control…

Reliability Block Diagrams
in Reliability Workbench

Download Reliability Workbench and access our powerful RBD module used in high profile projects at over 1200 sites worldwide.

  • Quickly build models using drag and drop and libraries
  • Fast and accurate system analysis
  • Fully integrated with FMEA and Markov analysis
  • Automatic conversion to fault trees
  • Importance and common cause analysis included
  • No limit to the number of blocks or hierarchical levels
  • Multiple standards support including ARP 4761, IEC 61508, ISO 26262
  • Integrated failure data libraries
  • Directly link to hazard logs for verification
  • Import/export facilities to databases and spreadsheets

Our software has been in continuous development since the 1980s and is the recognized standard for safety and reliability professionals.

 

 

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Why choose Isograph’s RBD Module?

There are many reasons to choose our powerful RBD module – here are
just a few:

 

Accurately Predict System Reliability

Our powerful minimal cut set generator ensures that dependent RBD structures are modelled efficiently and accurately. Determine the reliability and availability of complex systems and identify weak points with importance analysis Read More…

 

Highly Integrated

Link to prediction, FMEA, Markov models, failure data libraries and hazard logs for safety assessment verification. Automatically create fault tree structures
Read more about safety assessment…

 

Enterprise Level Safety Analysis

Perform safety analysis at an enterprise level using the Isograph Enterprise Database. Maintain projects and libraries in a security controlled environment Read More…

Reliability Block Diagram (RBD)

Do you need to analyse the reliability and availability of systems and sub-systems, and their failures with respect to parallel and series arrangements? Model your system’s true redundancy or logical configuration, and evaluate the availability of the system during or after the design phase. Regardless of the system size and complexity, the Reliability Block Diagram (RBD) software module graphically represents the logical interaction of failures and other events within your systems.

As part of the ITEM ToolKit integrated program, the Reliability Block Diagram (RBD) software module offers easy construction of network diagrams using point and click or drag and drop techniques. Once complete, Boolean Algebra expressions are used to determine minimal cut sets or the minimum combination of failures required to cause a system failure. As well as 15 built-in failure models, Markov models can be used for standby systems with respect to maintenance arrangements. RBD calculates system failure frequency and unavailability.

RBD module allows performing the functional Reliability and Availability analysis of systems with variety of reliability distributions, all practically used types of redundant reliability configurations and repair factors. While the basic RAM Commander module provides reliability calculations and predictions for non-redundant systems, RBD utilizes data defined in other modules (reliability, maintainability, FMECA), and performs either analytical calculation or Monte Carlo simulation depending on the type of a system reliability configuration.
RBD-supported configurations

• Series
• Parallel
• K-out-of-N with active (hot) redundancy
• K-out-of-N with stand-by (cold) redundancy
• Partially loaded K-out-of-N – warm redundancy
• K-out-of-N w/repair, w/o repair, w/restricted repair
• K-out-of-N with Switch
• Sub-RBD, K-out-of-N for Sub-RBDThe analytical technique is used mostly for exponential distributions. For each RBD, a graph of the reliability function R(t) can be drawn and MTBCF (Mean Time Between Critical Failures) can be calculated using numeric integration.

Monte Carlo simulation with its’ high speed, required accuracy, and adjustable number of steps allows to evaluate Reliability and Availability for any user defined configurations for which no analytical solution can be found, i.e. the most complex configurations, including standby, partially loaded and active redundancy; full or restricted repair with non-exponential distribution of time-to-repair; analysis under non-steady, transient state; dependent RBD elements; analysis of periodical inspection policy.
System Configuration feature of the RBD module is an ingenious answer to the requests of our customers who need to compare the reliability and availability of various system configurations created as the sub-sets of the project product tree. An ability to create an unlimited number of system configurations, easy transformation of each configuration into an RBD, MTBCF calculation, synchronized with the product tree changes, and finally a clear and elegant graphical presentation – all this makes the System Configuration feature an invaluable addition to the RAM Commander performance.

Abstract:

Nowadays, system reliability performance represents a key issue in any advanced technology application in order to guarantee ambient, personnel, and system safety. The core of this paper is the reliability block diagram (RBD) generation with the aim of providing project engineers a reliability prediction in the early stages of industrial product development. This study is focused on gas turbine auxiliary systems; these systems include both mechanical items (in particular hydraulic devices such as valves, pumps, and filters) and electronic ones (e.g., sensors, instruments, control logic). Such complex structures are decomposed in single blocks and interconnections to establish their mutual relationship and achieve reliability performance of the whole system. The case study is one of the most important gas turbine auxiliary systems, the mineral lube oil console. The aim of this paper is to introduce a new approach to assess system reliability prediction in presence of redundant and stand-by architectures; redundancy is widely used in industrial applications since it is one of the best techniques to achieve fault tolerance. The proposed method led to the development of a dedicated software tool RBDesigner that semiautomatically generates a RBD starting from the sketch of thermal-hydraulic systems and provides the most important reliability parameters. The use of the proposed tool allows project engineers to reduce time delivery, reduce time for improvements, achieve reliability targets, and guarantee availability performance to the customers. The strengths of RBDesigner were finally validated by a comparison with other commercial software solutions.

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