Warranty Data Analysis Example: Difference between revisions
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Kate Racaza (talk | contribs) (Created page with '{{Reference Example}} This example compares the warranty data analysis results. {{Reference_Example_Heading1}} The data set is from Example 11.2 on page 453 in the book ''Lif…') |
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{{Reference Example}} | {{Reference Example}} | ||
This example | This example validates the results of a warranty data analysis in a Weibull++ warranty folio. | ||
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A Nevada chart for the warranty data is provided in Table 11.3. The last two rows were combined, as specified in the example. | A Nevada chart for the warranty data is provided in Table 11.3. The last two rows were combined, as specified in the example. | ||
{| align="center" style="border-collapse: collapse;" cellpadding="5" cellspacing="0" style="text-align: center" | {| border="0" align="center" style="border-collapse: collapse;" cellpadding="5" cellspacing="0" style="text-align: center" | ||
! | |||
!colspan=" | !colspan="12" style="border-bottom: 2px solid black;"|TTF | ||
|- | |- | ||
!TIS | !TIS | ||
| Line 74: | Line 74: | ||
|- | |- | ||
!Total | !Total | ||
|9||12||16||18||19||17||21||19||14||14||6||3 | |9||12||16||18||19||17||21||19||14||14||6||3|| | ||
|- | |- | ||
|} | |} | ||
| Line 80: | Line 80: | ||
{{Reference_Example_Heading3}} | {{Reference_Example_Heading3}} | ||
The book first converted the data in the table above into the following format, as given in Table 11.4 in the book. | |||
{| {{table}} | |||
!TTF (Months) | |||
!Number of Failures | |||
!Number of Censored Units | |||
|- | |||
| 1||9||568 | |||
|- | |||
| 2||12||637 | |||
|- | |||
| 3||16||821 | |||
|- | |||
| 4||18||1229 | |||
|- | |||
| 5||19||1861 | |||
|- | |||
| 6||17||2032 | |||
|- | |||
| 7||21||2768 | |||
|- | |||
| 8||19||2927 | |||
|- | |||
| 9||14||3029 | |||
|- | |||
| 10||14||2203 | |||
|- | |||
| 11||6||1834 | |||
|- | |||
| 12||3||2090 | |||
|- | |||
|} | |||
A lognormal distribution is used and the fitted model parameters are: Ln-Mean = 6.03 and Ln-Std = 1.63. | |||
{{Reference_Example_Heading4}} | {{Reference_Example_Heading4}} | ||
In Weibull++, the data set is entered into a warranty folio, using the Nevada chart format. The following pictures show the sales and returns data. | |||
[[File: warranty_sales.png|center|550px]] | |||
[[Image: warranty_returns.png|center|550px]] | |||
The following picture shows the parameters of the lognormal distribution and its associated failure/suspension data. The results are the same as the results shown in the book. | |||
[[Image: warranty_results.png|center]] | |||
The following picture shows the probability plot of the lognormal distribution. | |||
[[Image: warranty_plot.png|center|550 px]] | |||
Latest revision as of 16:24, 28 September 2015
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