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Why free?has been working in the field of reliability, safety and quality of the safety-critical and mission-critical equipment (mainly aerospace, defense, transportation and telecommunications) for more than 25 years.We support the promotion of System Reliability and Safety and wish to make it more accessible for reliability and safety engineering practitioners and students. Will it be free forever?Currently it is free and there is no plans or intentions to change that. It is possible that in future we will charge money for extensive usage of the tool or usage of additional advanced functionality – however basic functionality will always stay free. Where should I download the tool and how to install it?No need to download or install. It is web-based tool, so just start using it inside your browser now. What if I need to build fault trees while I do not have internet connection?In this case you need to switch to one of our commercial Fault Tree tools like.
They may be installed on your laptop and may be used locally without internet connection. What if my fault trees are classified/confidential and I can't rely on web-based tool?In this case you need to switch to one of our commercial Fault Tree tools like. They may be installed on your organizational infrastructure and this way you will do not expose sensitive information. Do you provide other free tools?Yes, we have for reliability prediction, and we also provide 'Student' versions of our commercial tools for educational institutions and students – please contact our sales.
I need to perform FTA or FHA or a complex system and I do not know how to do that. Can you help?Yes, we provide not only tools – we have more than 100 reliability and safety engineers providing to our customers worldwide.
We may do the analysis for you, we may teach you to do the analysis, we may provide the right tools to do the analysis and we may do the combination of all – teach you, provide tools, and perform specific parts of the analysis for you. Contact our sales for more information. What if I have problems or questions?The and is provided as-is, without technical support. However we are committed to continuously improve it and therefore appreciate your comments and suggestions - please send suggestions to.
Introduction to Fault Tree Analysis (FTA)Engineers are tasked with anticipating failure well in advance of a product making it to the consumer. Potential failure must be identified early in the product development cycle to successfully mitigate the risk. This failure prevention activity is intended to protect the consumer from an unacceptable experience. There are many tools used to identify potential failures and their causes / mechanisms. One of these tools is Fault Tree Analysis (FTA).
FTA is a deductive analysis depicting a visual path of failure. As product and process technology becomes more complex, the visual FTA approach has proven to be invaluable as a stand-alone risk technique or a supplement to. What is Fault Tree Analysis (FTA)Fault Tree Analysis is a top-down, deductive analysis which visually depicts a failure path or failure chain. FTA follows the concept of Boolean logic, which permits the creation of a series of statements based on True / False. When linked in a chain, these statements form a logic diagram of failure. Events are arranged in sequences of series relationships (the “ors”) or parallel relationships (the “ands”). Results for each event are presented in a tree-like diagram using logic symbols to show dependencies among events.Events are related to mechanical components, software and / or electronics used in the design of the product.
Top-level, undesired events are the primary topic being studied in FTA. The severity classification of the Top-level event is often determined in a Systems-level Hazard Analysis.Fault Tree Analysis also provides valuable troubleshooting information when applied to problem solving. The FTA diagram often utilizes failure probabilities at each level, from components and software to the undesirable Top-level event. Why Perform Fault Tree Analysis (FTA)FTA depicts the risk-based path to a root cause or Base-level event.
Cafta Software Program
The identified risks drive actions which are intended to mitigate the risk prior to program launch. Alternatively, when investigating a failure, the chain of events depicted by FTA allows the problem solver to see the events leading to a root cause(s) or Base-level event.
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The Fault Tree Analysis is applied when:. A Hazard Analysis previously indicated a safety concern. There is a new design with new content.
There is a current design with modifications, which may include changes due to past failure. There is a current design being used in a new environment or change in duty cycle (no physical change made to design). Investigation of a safety or regulatory concern. A picture of the failure would be more beneficial than a written inductive analysis.
How to Perform Fault Tree Analysis (FTA)As previously mentioned, the FTA is a logical breakdown from the Top-level undesired event, cascaded to the Base-level event (root cause). Each path has a probability assigned.
The paths related to the highest severity / highest probability combinations are identified and will require mitigation. Starting at the Base-level event (at the bottom of the FTA) and working the path up to the undesirable Top-level event is called a Cut Set.
There are many cut sets within the FTA. Each has an individual probability assigned to it. The Base-level event is often color coded to identify the risk level indicated.The 5 basic steps to perform a Fault Tree Analysis are as follows:. Identify the Hazard. Obtain Understanding of the System Being Analyzed. Create the Fault Tree. Identify the Cut Sets.
Mitigate the RiskStep 1: Identify the HazardKnowing the consequence of the failure is useful in defining the Top-level event of the Fault Tree. The Top-level event, or Hazard, should be defined as precisely as possible:.
How much?. How long (duration)?. What is the safety impact?. What is the environmental impact?.
What is the regulatory impact?Step 2: Obtain Understanding of the System Being Analyzed. Create or acquire appropriate support information:. List of components (Bill of Material). Boundary Diagram. Schematic. Code Requirements.
Engineering Noises and Environments. Examples of similar products or failures. List the potential causes of the hazard to the next level. This is similar to the process, except development of a Fault Tree should be focused on a single level before progressing to the next. Include system design engineers, who have full knowledge of the system and its functions, in the higher levels of the Fault Tree Analysis.
This knowledge is very important for cause selection. Include Reliability Engineers who can assist in developing the relationships of causes to a failure or fault. Estimate probability of the causes at the Base-level event.
Label all causes with codes (optional). Prioritize or sequence causes in the order of occurrence or probabilityStep 3: Create the Fault TreeIn the FTA example to the right, the team would stop the analysis on “Air Present” because Oxygen presence is outside of the control of the team developing the FTA.Analysis continues down to the next level on “Fuel Leak”. The team performing the FTA is brought together to focus on the potential causes of fuel leaks. Recover my files 5.2 1 offline activation key.
The analysis is not limited to mechanical failures alone. The inclusion of electronics and software in complex design brings both the opportunity to create or mitigate failures. The risks may be prevented through engineering choices or controlled through Quality Control.The example tree continues to additional, more detailed levels. Fault Tree Analysis (FTA) ServicesThe FTA Services available from Quality-One are FTA Consulting, FTA Training and FTA Support, which may include Facilitation, Auditing or Contract Services. Our experienced team of highly trained professionals will provide a customized approach for developing your people and processes based on your unique FTA needs. Whether you need Consulting to assist with a plan to deploy FTA, Training to help understand and drive improvement or hands-on Project Support for building and implementing your FTA process, Quality-One can support you! By utilizing our experienced Subject Matter Experts (SME) to work with your teams, Quality-One can help you appreciate the value of FTA in your organization.
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