In cowboy2718/FMEA: Failure MOde Effects Analysis with R

FMEA Package Overview

This simple package graphs output from an Failure Mode Effects (FMEA) onto a hazard or disutility graph (failure occurrence by failure severity) and a controls graph (failure detection by failure occurrence). It also provides risk zones on the hazard graph along with labels of items from your FMEA worksheet.

Package Usage

This package imports a file (usually in Excel) and then plots scatterplot type graphs to understand risk. The code can be incorporated into a markdown report or however desired.

R Packages

The following R packages are used:

library(ggplot2)
library(dplyr)
library(ggrepel)

Minimum Data Requirements

The data table must have the following field names:

item_no
severity
occurrence detection

Of course, there will be other fields included. See the example data sheet called fmea_working_file.xls for a complete listing of fields and names (found under inst\ extdata).

Making the graphs

The following code shows how the graphs can be made:

library(ggplot2)
library(dplyr)
library(ggrepel)

# If importing an Excel worksheet, the following code chunk is to be used (based on your working directory).

library(readxl)
fmea_working_file <- read_excel("~/Data/Statistical Projects/R Projects/FMEA/inst/extdata/fmea_working_file.xls")

# To make the hazard or disutility graph (with risk zones)

risk_disutility(fmea_working_file)

# To make the risk controls graph (no risk zones)

risk_controls(fmea_working_file)

The graphs can then be incorporated into a risk report or presentation as needed.

References

Zone configurations for the hazard or disutility graph is based on the following:

Carlson, Carl S., Effective FMEAs: Achieving Safe, Reliable, and Economical Products and Processes Using Failure Mode and Effects Analysis, John Wiley and Sons, New York, 2012, p. 164.

Code can be altered to provide differing risk zone configurations.

cowboy2718/FMEA documentation built on May 4, 2019, 1:21 p.m.