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Langlie for Excel

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Introduction

"Langlie for Excel" is used for the analysis of samples during destructive stress tests (one shot) following the Langlie method (H. J. Langlie (1965), " A Reliability test Method For ' One Shot ' Items ", Technical report U-1792, Third edition, Aeronutronic division of Ford Motor Company, Newport Beach, C.A.). This method is used for checking initiators, airbags, detonators, ignition devices, gas producers etc.

Langlie method - how does it work ?

The Langlie method is a procedure comparable to a search tree, which uses the medium between two given boundaries as the first stress level. Following stress levels are determined by preceding results and can have any value (thus no fixed levels). When the number of positive and negative results matches, the process starts again from the beginning. In relation to the sample size the Langlie method produces more accurate values for the mean and standard deviation than Probit or Bruceton methods. The mean and standard deviation are extracted by an iteration afterwards.

The Advantage

Because the sample size for a sufficient result is so small, cost savings result in contrast to the other procedures mentioned. This is why the expenses for this software amortize quickly.

Usage and interfaces

With this program you have the choice either to manually enter the determined stress level into your controller (ignition device, pulse generator, current regulator, voltage regulator) or to adjust the testing facility (height, weight) accordingly. Or you can transmit the determined stress level directly to the the controller, if it is equipped with an IEEE-interface. Prerequisite for this is an IEEE interface card.

System requirements

  • Microsoft Windows 95/98/ME or NT4/2000/XP/Vista based PC
  • Microsoft Excel 97, 2000, XP, 2003 (Version 1) or Excel 2007 or 2010 (Version 2)
  • optional: IEEE-488-interface card (PCI-488, PC-488 or 488EX from Measurement Computing Corporation, formerly Capital Equipment Corporation (www.mccdaq.com)

References

Our product is, among others, currently being used by the following companies and organizations:

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