FTA

A safety analysis is a structured way of looking at a system to find out what could go wrong, how bad it would be, and what needs to be done about it. It starts with understanding the system, then works through finding hazards, judging their risk, adding protections, checking the protections work, and writing everything down. The goal is to catch problems before they happen, rather than reacting to them after an accident. Some of the most common safety analyses are HARA FMEA

In the previous blog, we talked about the mathematics behind different gates in a Fault Tree Analyses. In this blog, we talk about what the results from an FTA mean. Which failures matter most: importance measures Once you can compute the top-event probability, you can ask the next question: Which basic event is actually driving the risk? This is what importance measures quantify, and they're how engineers prioritize. The Fussell-Vesely (FV) measure: the most commonly used, t

In a previous blog post, we have discussed how a fault tree is built, a top-down map of how a system can fail, starting from the worst outcome and branching down to root causes. A tree like that tells you how a system can fail and where its weak points are. But it leaves a crucial question unanswered: how likely is that failure, really? Is the top event a one-in-a-thousand risk or a one-in-a-billion one? Answering that is the job of quantitative fault tree analysis, and it's

In the previous blog post, we talked about the theory behind the FTA. In this post, we are going to do a concrete example of an FTA A quick example: "Vehicle does not steer" To see how the pieces fit together, take a safety-critical top event from an automated vehicle: the vehicle does not steer. Loss of steering can happen in several independent ways, so directly beneath the top event sits an OR gate: any one branch alone is enough to cause it. Fig: FTA example The first bra

Before a passenger jet, a nuclear reactor, or a car's braking system is ever trusted with human lives, engineers sit down and ask a simple question: what would have to go wrong for this to fail catastrophically? Not "will it fail," but "what exact combination of smaller faults would it take." Answering that question rigorously is the job of Fault Tree Analysis (FTA), one of the most widely used safety and reliability techniques in engineering. What is an FTA ? Fault Tree Anal