Weibull++ Equation Fit Solver Example

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Weibull++ Equation Fit Solver Example

The Equation Fit Solver can be used to perform linear and nonlinear regression. For example, assume that an engineer collected the following degradation data.

Time Reading
58.08
1013.52
1521.86
2031.96
2537.86
3046.67
3553.35
4062.29
4571.62
5080.37
5591.43
60104.00

From the physical mechanism, the engineer knows that the degradation path follows the following equation:

y = a + bx + cln(x)

where:

  • x is the time
  • y is the degradation reading.

This model is not a standard degradation model in Weibull++; however, the problem can be solved by using the Equation Fit Solver.

Solution:

Step 1: Insert an Equation Fit Solver folio in your project and enter the given data in the folio, as shown next.

Step 2: Enter the degradation equation in the control panel and name it “My Degradation Equation,” as shown next.


Step 3: Click Calculate. The following picture shows the results.

Step 4: You can use the Calculate Y given X area on the control panel to make predictions. For example, the predicted Y value at X=100 is 176.2424.

Step 5: The following plot shows the fitted model and the observed values.

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