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Sealing Characteristics

How to Reduce the Trials for Sealing Elements: Work Smarter, not Harder!

| Author / Editor: Ibrahim Kar, Michael Berz* / Dominik Stephan

Influence on the total leakage rate (LT) in a “sealing process” because of the influencing and disturbing variables (Ii and Di)
Influence on the total leakage rate (LT) in a “sealing process” because of the influencing and disturbing variables (Ii and Di) (Source: Ibrahim Kar)

How to reduce the trial period for experimental investigations of sealing elements by using the Kalman filter — The Kalman filter can be used to economize experimental investigations of sealing elements. In these investigations, the emission characteristics of sealing elements are determined to describe the sealing behavior. One of the most significant emission parameters is the total leakage rate.

The statistical test methodology, combining the experiment planning, set-up and procedure as well as evaluation, is a useful tool in a wide variety of scientific fields. Hereby, the experimental procedure provides a framework for the set-up and execution of the trials. In combination, further methods can be used to minimize the required time for investigations. Therefore, various algorithms or “filters” are suitable, one of them is the so-called Kalman filter.

Two typical trials are presented as below in the examples: The total leakage rate is displayed on the vertical axis and the measurement time on the horizontal. In Figure 1 the total leakage rate starts at LT 1 10-9 mbar · l/s and rises rapidly up to TT = 50 min to LT 3 10-6 mbar · l/s. The measurement values were recorded up to a measurement time of 200 min. Basically, the trials could have been terminated after a measuring time of 100 min. However, to obtain a reliable result, the test could run longer. Figure 2 shows an almost “ideal” series of trials with a stand­ard deviation of 10-7 mbar · l/s.

* * Kar is a specialist for cost estimates, time scheduling and artificial intelligence at Shell; Berz works as a Senior Cost Estimator at Jacobs Engineering.

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