Related Topics:

Monte Carlo and SimuMatic

Weibull++ Monte Carlo Utility

ALTA Monte Carlo Utility

The ALTA Monte Carlo utility uses Monte Carlo simulation to generate a single data set containing values that are distributed according to a specified model. The software uses the cdf (cumulative distribution function) of the relevant model to solve for time given an unreliability value chosen from a uniform random distribution. The process is repeated with new random unreliability values until the desired number of data points is obtained. The data set is then automatically placed in a ALTA standard folio, where it can be analyzed like any other data set.

To access ALTA’s Monte Carlo utility choose Home > Tools > ALTA Monte Carlo.

The setup window will appear. Follow the steps outlined below to set up the simulation:

  1. On the Main tab of the window, select a model, enter its required parameter values and select the time units (e.g., hours) for the failures/suspensions in the data set. In addition, please note the following:

    Every additional stress column represents an additional stress type. So, for example, a data sheet with two stress columns would be used to simulate data obtained from a two-stress test. The different rows would then be used to represent different stress value combinations for the two stresses.

  2. On the Stress tab, enter the appropriate Use Level stress value for each stress type. This is the stress level that the product is expected to operate under during normal use conditions. If you have selected to generate a data set with more than one stress type, multiple input fields will be available, where the first input field corresponds to Stress 1, the second to Stress 2, and so forth.

  3. In the data sheet on the right side of the window, specify how many data points you want generated for each stress level, and specify the values for each stress level.

    Each row in the data sheet represents a stress level, and every stress column represents a stress type. For a multi-stress model, the stress level is the combination of stress values that will be applied to each group of tested units. Thus, the first row of the above table would configure the utility to generate 10 data points from 2 stresses, one with a value of 348 and another with a value of 3. The second row would generate an additional 10 data points from a different combination of stress values, and so on.

  4. Select the appropriate option on the Censoring tab:

  5. On the Settings tab, specify how you want to generate the data set and where you want the data to be stored.

After the simulation is set up, click Generate to create a data set according to your specifications. An ALTA standard folio containing the data will appear.

 

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