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event tree analysis

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780035
EISBN: 978-1-62708-268-6
... Abstract Fault-tree analysis is a graphical technique that identifies all events and combinations of events that can produce an undesired event. This chapter emphasizes several fault-tree analysis concepts, examining with examples how all three categories of charting symbols (events, gates...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780057
EISBN: 978-1-62708-268-6
... Abstract Quantifying a fault-tree analysis is a useful tool for assessing the most likely causes of a system failure. This chapter addresses fault-tree analysis event probabilities and ranking of failure causes based on these probabilities. Failure rates, failure-rate sources, probability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780047
EISBN: 978-1-62708-268-6
..., Picatinny Arsenal, U.S. Army, 1968 A fault-tree analysis for a complex system failure analysis can include hundreds (sometimes thousands) of events and conditions. Not all of these will fit on a single sheet, so fault-tree analysis uses transfer symbols to transfer logic (the fault-tree graphics...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
... analysis. The fault-tree method in FMEA is a top-down technique that graphically structures events with Boolean operators (i.e., “AND” and “OR” gates), as briefly described in this chapter. Initially, FMEA procedures were used primarily as a safety analysis on the system hardware ( Ref 21 , 22 ), often...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780019
EISBN: 978-1-62708-268-6
... missile launched inadvertently? Such an event would be cataclysmic and incomprehensible. It was precisely this hypothesized system failure that led to the creation of the fault-tree analysis technique. The U.S. Air Force realized it had no analytical tool that could adequately define (and thereby allow...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780081
EISBN: 978-1-62708-268-6
.... Then, during one of the monthly flight lot-acceptance tests, one of the dispensers failed to open. After preparing a fault-tree analysis, the failure analysis team examined components from the recovered (and unexploded) cluster bomb dispenser. The returned components had been damaged too severely...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780147
EISBN: 978-1-62708-268-6
... a few suppliers, and it is expensive, but it is not really necessary if the failure analysis team uses the fault-tree analysis technique to identify all potential failure causes. If a sneak circuit is present, the fault tree will find it. Chapter 12 describes the analysis of broken mechanical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270019
EISBN: 978-1-62708-301-0
... these tests is phenomenal and is extremely useful to pinpoint the cause, mechanism, and sequence of the failure event. A separate chapter is devoted to cover these details. Chemical analysis of samples from the component provides information regarding any deviation from the standard specifications...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110524
EISBN: 978-1-62708-247-1
... to tell you something important. Once the dominant failure mechanisms are understood, one can build a failure analysis tree. All skilled analysts, perhaps without realizing it, use such a decision tree to guide their thinking, even if they haven’t gone to the trouble of documenting it. The failure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780067
EISBN: 978-1-62708-268-6
... To assist in describing the preparation of an FMA&A, the fault-tree analysis described earlier in Chapter 5 for the top undesired event, “Light bulb does not illuminate,” is used once again. For easy reference, the light bulb fault-tree analysis is included in this chapter as Fig. 8.1 . Table 8.1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780171
EISBN: 978-1-62708-268-6
... team prepared a fault-tree analysis with the top undesired event, “Guillotine does not cut and clamp.” After preparing the fault-tree analysis, the failure analysis team discovered that there were over 150 potential failure causes. After preparing an FMA&A, the team ruled out all but three...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180091
EISBN: 978-1-62708-256-3
... to solve the root cause(s) identified in the failure analysis. In reality, each corrective action usually becomes apparent as each root cause is identified during the failure investigation. Repeat the instructions in step 3 and create a corrective action tree. The corrective action tree shown in Fig. 6...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270168
EISBN: 978-1-62708-301-0
....), LPT blade locking plate (1 No.), T-headed bolts (43 Nos.), Bihexagonal nuts (38 Nos.), damaged fir tree portions (38 Nos.), and LP turbine disc (1 No.). All the parts were solvent cleaned and examined visually and under the microscope. The two broken studs were extracted using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180127
EISBN: 978-1-62708-256-3
.... The Kepner-Tregoe (KT) method streamlines the problem-solving technique used in failure analysis and works well in industrial failure situations. The KT method is not as thorough as fault tree analysis, because potential causes get trimmed early in the process if they are found to be impossible. However...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780109
EISBN: 978-1-62708-268-6
... by the engineering drawing is the type being used. Fault-tree analyses often show subassembly failures as undeveloped events. (The subassembly is treated as a “black box.”) These failures are relatively easy to confirm. The failure analysis team can define the required inputs and outputs of the electronic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180061
EISBN: 978-1-62708-256-3
... Abstract Statistics, data analysis, root cause analysis, and problem-solving processes play a key role in failure investigations. This chapter explains how to collect failure investigation data, how to build and maintain a database for company-related failures, and how to use corresponding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110513
EISBN: 978-1-62708-247-1
..., failure signatures, environmental conditions, regional failure occurrences, user profile issues, and more in the failure analysis process to improve root cause findings. automotive electronics failure analysis failure anamnesis preventive risk evaluation root cause analysis Automotives...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630117
EISBN: 978-1-62708-270-9
... on the metal involved and the circumstances of stress and environment. References 1. Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 1986 , p 4 , 104 , 110 , 530 – 533 2. DeVries P.H. , Ruth K.T. , and Dennies D.P...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180029
EISBN: 978-1-62708-256-3
... of identifying root causes to prevent repeat failures. failure investigation root cause analysis service defect maintenance defect testing defect assembly defect manufacturing defect design errors Tacoma Narrows bridge bridge collapse wind dynamics bridge design physical mechanisms human...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.9781627082563
EISBN: 978-1-62708-256-3