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Issue 60, February 2006

 Hot Topics Reliability Basics Tool Tips Latest Software Updates Hot News Contribute to HotWire

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Hot Topics

Using Simulation to Design Reliability Demonstration Tests

Designing reliability demonstration tests is an integral part of any reliability program. These tests are often required to demonstrate customer reliability and confidence requirements. While it is desirable to be able to test a large population of units to failure in order to obtain information on a product's or design's reliability, time and resource constraints sometimes make this impossible. In cases such as these, a test can be run on a specified number of units, or for a specified amount of time, that will demonstrate that the product has met or exceeded a given reliability at a given confidence level. In the final analysis, the actual reliability of the units will of course remain unknown, but the reliability engineer will be able to state that certain specifications have been met. In addition to analytical methods (such as the Parametric Binomial, the Non-Parametric Binomial and the Exponential Chi-Squared methods), a simulation method is also possible.

This article explores the application of simulation and the SimuMatic tool to design a reliability demonstration test.

Reliability Basics

Bayesian Confidence Bounds

One of the many new additions to Weibull++ 7 is the method of estimating confidence bounds based on the Bayes theorem. This type of confidence bounds relies on a different school of thought in statistical analysis, where prior information is combined with sample data in order to make inferences about model parameters and their functions. An introduction to Bayesian methods is given in this article.

Tool Tips
• How is a maintenance tasks assigned interval determined in RCM++?
• Does RENO provide any way to make entering equations easier?

New service releases are now available for ALTA (Version 6.5.1), BlockSim (SR 6.5.2),  Xfmea Standard (SR 3.5.1), Xfmea Enterprise (SR 3.5.1), RCM++ (SR 3.5.1) and RENO (SR 1.0.7). To determine the compile revision of the application on your computer, select About from the Help menu. More Software Downloads...

 Application Date Created Version ALTA ALTA 2/2/06 6.5.1 ALTA Update N/A Version 6.5.1 is a FREE Version UPDATE to ALTA. BlockSim BlockSim 2/2/06 6.5.2 BlockSim Update 2/2/06 SR 6.5.2 Xfmea Xfmea Standard Xfmea Enterprise 2/2/06 3.5.1 Xfmea Standard Update Xfmea Enterprise Update 2/2/06 SR 3.5.1 RCM++ RCM++ 2/2/06 3.5.1 RCM++ Update 2/2/06 SR 3.5.1 RENO RENO 2/13/06 1.0.7 RENO Update 2/13/06 SR 1.0.7
Hot News
Mettas and Vassiliou Receive Award at RAMS - ReliaSoft's Adamantios Mettas and Pantelis Vassiliou received the Alan O. Plait award at this year's annual Reliability and Maintainability Symposium (RAMS) for the best tutorial presented at the 2005 Symposium. The tutorial title was "Understanding Accelerated Life Testing Analysis."
Applied Reliability Symposium - Early registration will be ending soon for the International Applied Reliability Symposium, North America, which will be held June 14 - 16, 2006 in Orlando, Florida. If you haven't already taken advantage of this opportunity to save, now is the time to do so. Early registration expires on March 1st, 2006! Easy online registration is available at: http://www.ARSymposium.org/register.htm.
2006 ARS Key Note Speaker The ARS Board of Directors is pleased to announce Ernest A. Seglie, PhD as the keynote speaker for this years Symposium. He is the current Science Advisor for Operational Test and Evaluation, Office of the Secretary of Defense. He provides scientific and technical guidance on the overall approach to Department of Defense (DoD) evaluation of the operational effectiveness and suitability of major DoD weapon systems; provides technical review of test reports; and serves as chief technical advisor to the Director, OT&E. Dr. Seglie will be leading off on the second day of the Applied Reliability Symposium this coming June in Orlando, Florida. The complete 2006 Program Matrix is available for review at: http://www.ARSymposium.org/2006/2006matrix_t.htm.
ReliaSoft at RAMS - Thanks to everyone who stopped by our booth at the 52nd Annual Reliability and Maintainability Symposium (RAMS) last month. It was great seeing our old friends and making new ones. We look forward to hearing more from you over the course of the year!
 Public Training Event Calendar February 2006 February 21 - 24, 2006: MSMT Foundations in So Paulo, Brazil February 23 - 24, 2006: RS 470 - FMEA/FMECA and Xfmea  in Singapore February 27 - March 3, 2006: MSMT Foundations in Tucson, Arizona March 2006 March 1 - 2, 2006: RS 440 - Applied Reliability for the Semiconductor Industry in Malaysia March 7 - 8, 2006: RS 470 - FMEA/FMECA and Xfmea  in Philippines March 9 - 10, 2006: RS 470 - FMEA/FMECA and Xfmea in So Paulo, Brazil March 13 - 17, 2006: MSMT Foundations in Shenzhen, China March 15 - 17, 2006: RS 480 - Introduction to RCM Principles and Applications in So Paulo, Brazil March 20 - 24, 2006: MSMT Foundations in Philippines March 27 - 28, 2006: RS 480 - Introduction to RCM Principles and Applications in Tucson, Arizona March 27 - 29, 2006: RS 522 - Advanced System Analysis and BlockSim in Tucson, Arizona March 28 - 31, 2006: MSMT Foundations in So Paulo, Brazil March 30 - 31, 2006: RS 470 - FMEA/FMECA and Xfmea in Tucson, Arizona April 2006 April 3 - 7, 2006: MSMT Foundations in Frankfurt, Germany April 3 - 7, 2006: MSMT Foundations in Singapore April 5 - 7, 2006: RS 525 - Advanced Probabilistic and Risk Decision Analysis and RENO in Tucson, Arizona April 6 - 7, 2006: RS 588 - Design of Experiments in So Paulo, Brazil April 10 - 11, 2006: RS 401 - Life Data Analysis and Weibull++ (Condensed) in Pune, India April 11 - 13, 2006: RS 521 - Advanced QALT Data Analysis and ALTA PRO in So Paulo, Brazil April 24 - 28, 2006: MSMT Foundations in Tucson, Arizona April 24 - 28, 2006: MSMT Foundations in Taipei, Taiwan March 28 - 31, 2006: MSMT Foundations in So Paulo, Brazil
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