Top failures with at least one base failure with no actions

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Top failures with at least one base failure with no actions

Explanation:

A search will be performed for top failures that are linked to at least one base failure, whereby the base failure(s) do not have a single action assigned (neither preventive or detection).

Anmerkungen:

  • Top failures (TF) are failures which have causes but no effects.
  • Base failures (BF) are failures which have effects but no causes.

Example:


Abbreviations
  • ASIL = Automotive safety integrity level
  • BF = Base failure of a base function
  • BFn = Base function of a base structure element
  • BSE = Base structure element
  • Cl Prc = Classification for process characteristic
  • Cl Prd = Classification for product characteristic
  • Cl Req = Classification for requirement
  • CM = Control method
  • DA = Detection action
  • DC = Diagnostic coverage
  • DSCF = Dangerous safety critical failure
  • Er Det = Error detection
  • Er Resp = Error response
  • F = Failure
  • FIT = Failure in time
  • Fn = Function
  • FSM = Functional safety management
  • IE = Inspection equipment
  • LF = Latent fault
  • LFM = Latent fault metric
  • OC = Operating condition
  • PA = Preventive action
  • PE = Process element
  • PFH = Probability of failure per Hour
  • PMHF = Probabilistic metric for random hardware failures
  • PrcC = Process characteristic
  • PrdC = Product characteristic
  • QM = Quality method
  • QR = Quality rule
  • Req = Requirement
  • RMR = Risk Matrix Ranking
  • RP = Reaction plan
  • SE = Structure element
  • SE ErDet = Structure element for error detections
  • SE ErResp = Structure element for error responses
  • SFF = Safe failure fraction
  • SG = Safety Goal
  • SIL = Safety integrity level
  • SM = Organisational-SE for “safety mechanisms”
  • SPF = Single point fault
  • SPFM = Single point fault metric
  • TF = Top failure of a top function
  • TFn = Top function at root element
  • TS = Test sample


074-SE

  • TF1 and TF2 are two top failures anchored at the root elements in the above structure.
  • With the display option “Actions” in the structure list active, it is possible to see at which failures the actions are anchored.
  • There is a further TF found at SE1 B, “F5”. You can see in the following images (Graph Editor & Failure Net Editor) how the failures are linked with each other.
  • To see which failures have actions in the failure net, the display option “Actions” is active.

Graph Editor:

Graph Editor

Failure Net Editor from viewpoint of TF:

074_failure_2

Search result: Search results

Two top failures are found, which are linked to at least one base failure that has no detection- or preventive action assigned to it. These are TF2 and F5.

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