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A question that was posted on ReliaSoft's
Discussion Forum
asks whether ReliaSoft's Weibull++ software can calculate t In the referenced article, the author is
computing a three parameter Weibull distribution, where t
The computed parameters (using the data as presented by the author) are shown next:
The location parameter calculated by
Weibull++ (also called gamma or t
Based on the inputs, a table of optimum replacement times will be generated for times from 1000 hours up to 1200 hours with an interval of 10 hours. The cost for a planned replacement is 250 and the cost of an unplanned replacement is 600. The results are displayed in the General Spreadsheet, as shown next.
As you can see from these results, the optimum replacement time is equal to 1150 hours based on the lowest Cost/Unit Time. A more precise optimum replacement time can be calculated by decreasing the increment time or by using ReliaSoft's BlockSim software. A diagram consisting of a single block with a failure distribution defined by the estimated Weibull++ parameters can be used to calculate the optimum replacement time, as shown next.
The optimum replacement time is equal to 1152.7964 hours. |
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