Reliability HotWire: eMagazine for the Reliability Professional
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Issue 60, February 2006

*Hot Topics
*Reliability Basics
*Tool Tips
*Latest Software Updates
*Hot News
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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.

To read more, see 

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.

To read more, see 

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

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Latest Software Updates
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 2/2/06 6.5.1
ALTA Update N/A Version 6.5.1 is a FREE Version UPDATE to ALTA.
BlockSim 2/2/06 6.5.2
BlockSim Update 2/2/06 SR 6.5.2
Xfmea Standard
Xfmea Enterprise
2/2/06 3.5.1
Xfmea Standard Update
Xfmea Enterprise Update
2/2/06 SR 3.5.1
RCM++ 2/2/06 3.5.1
RCM++ Update 2/2/06 SR 3.5.1
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:
* 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:
* 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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As always, your feedback and contributions are appreciated. ReliaSoft is able to provide the most user-friendly reliability software packages and support because we listen to our customers. This applies to our newsletters and publications as well. We welcome any suggestions or contributions you may have for Reliability HotWire. If you have a topic or article that you think would be useful to the readers of Reliability HotWire, feel free to contact us.

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