Modifies an existing fault tree with the addition of a pure demand event.
addDemand(DF, at, mttf, tag="", label="", name="", name2="", description="")Returns the input fault tree dataframe appended with an entry row for the defined component event. Note that when a pure demand is used in combination under an AND gate, the result will contain only a conditional fail rate.
A fault tree dataframe such as returned from ftree.make or related add... functions.
The ID of the parent node for this addition.
The mean time interval to events. It is the user's responsibility to maintain constant units of time.
A very short identifying string (typically 5 characters or less) uniquely identifying a basic event for minimal cutset evaluation
An identifying string for the logic gate. Use of label in ftree.make defines the convention for rest of tree construction.
A short identifying string (typically less than 24 characters)
A second line, if needed for the identifying string label
An optional string providing more detail for the resultant event.
Nicholls, David [Editor] (2005) System Reliability Toolkit Reliability information Analysis Center
O'Connor, Patrick D.T. (1991) Practical Reliability Engineering John Wiley & Sons
Vesely, W.E., Goldberg, F.F., Roberts, N.H., Haasl, D.F. (1981) Fault Tree Handbook U.S. Nuclear Regulatory Commission
Vesely, W.E., Stamatelato, M., Dugan, J., Fragola, J., Minarick, J., Railsback, J. (2002) Fault Tree Handbook with Aerospace Applications NASA
Doelp, L.C., Lee, G.K., Linney, R.E., Ormsby R.W. (1984) Quantitative fault tree analysis: Gate-by-gate method Plant/Operations Progress Volume 3, Issue 4 American Institute of Chemical Engineers
mytree <-ftree.make(type="and")
mytree <- addDemand(mytree, at=1, mttf=1, name="power interruption")
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