| In this issue: |
Issue 106,
December 2009 |
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Reliability HotWire is a service of
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Hot Topics |
Reliability Demonstration Tests for Repairable Systems
Reliability demonstration tests for non-repairable systems are well developed and regularly used by reliability engineers. A tool called the Design of Reliability Tests (DRT) that helps users design such tests is included in
Weibull++. For non-repairable systems or components, reliability demonstration tests are used to demonstrate the reliability at a given time with a given confidence level. For repairable systems, users are more interested in demonstrating the MTBF or the number of failures/repairs during a given time period. In
RGA 7,
a new DRT tool for repairable systems has been designed for this purpose.
To read more, see
http://www.weibull.com/hotwire/issue106/hottopics106.htm
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Reliability Basics |
Comparison of Fisher Matrix and Likelihood Ratio Confidence Bound Methods
In Weibull++,
there are several ways to calculate reliability
confidence bounds for different distributions. The
Fisher matrix (FM) method and the likelihood ratio
bounds (LRB) method are both used very often. Both
methods are derived from the fact that the parameters
estimated are computed using the maximum likelihood
estimation (MLE) method. However, they are based on different theories. The MLE estimates are based on large sample normal theory, and are easy to compute. However, when there are only a few failures, the large sample normal theory is not very accurate. Thus, the FM bounds interval could be very different from the true values. The LRB method is based on the Chi-Squared distribution assumption. It is generally better than FM bounds when the sample size is small. In this article, we will compare these two methods for different sample sizes using the Weibull distribution.To read more, see
http://www.weibull.com/hotwire/issue106/relbasics106.htm
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Tool Tips |
- How can I choose what type of Data Sheet to use in RGA 7?
- What is an easy and affordable way to ensure that I always have the latest version of ReliaSoft’s software?
To read more, see
http://www.weibull.com/hotwire/issue106/tooltips106.htm
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Latest Software Updates |
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New service releases are now available for
and Lambda
Predict (SR 3.0.3).
To determine the compile revision of the application on
your computer, select About from the Help
menu.
More Software Downloads...
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Hot News |
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ARS Europe
Advance Registration
- The 2010 European
Applied Reliability Symposium will be held in
Berlin,
Germany from April 7 - 9, 2010. You can save €100 by registering early!
The advance
registration deadline is January 29, 2010, so
don't wait -- register now at
http://www.ARSymposium.org/europe/register_eu.htm.
For more information, including the program matrix,
please visit
http://www.ARSymposium.org/europe/index.htm. |
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56th Annual Reliability &
Maintainability Symposium
(RAMS) -
ReliaSoft Corporation
is proud to announce our
continued participation in
the annual RAMS event. In
addition to exhibiting
our products, we
also will be presenting three
tutorials and four papers
covering
topics such as reliability
program planning, FMEAs,
reliability estimation and
temperature acceleration in
reliability prediction.
Be sure to stop by our booth
to meet our reliability
experts, who will provide
you with valuable
information and a
preview of the extensive
capabilities of our complete
suite of reliability tools
including our Web-based
XFRACAS application.
We look forward to seeing
you at the Doubletree
Hotel San Jose in
California from
January 25 - 28, 2010. For
an advance program and
registration information,
please visit
http://www.rams.org. |
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ARS
North America Proposals -
The Applied Reliability
Symposium is renowned for world-class presentations
in the field of reliability and maintainability
engineering. Do you have what it takes to garner a
coveted presentation slot at ARS? Could you be standing
among the Excellent Presentation Award winners at the
2010 event in North
America, which will be held from June 15 - 17, 2010 in
Reno, Nevada? You will never know unless you submit
your presentation proposal by December 14, 2009.
Everything you need to know is available for review
online at
http://www.ARSymposium.org/present.htm. For those who have already
submitted their presentation proposals, thank you! The
ARS Committee sincerely appreciates your effort and will
begin the selection process soon. For those who have yet
to submit their proposals, time is running out,
so act now!
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Upcoming
Public Training Event Calendar |
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December 2009 |
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December 14 - 18, 2009:
RS 540 Reliability and
Maintainability Analysis for
Repairable Systems
in
Chennai, India |
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January
2010 |
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January 6 - 8, 2010:
RS 560 Fundamentals of Design for Reliability
in
Hyderabad, India |
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February
2010 |
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February 8 - 12, 2010:
MSMT Foundations
in
Berlin, Germany |
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February 10 - 12, 2010:
RS 560 Fundamentals of Design for
Reliability
in
New Delhi,
India |
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February 22 - 26, 2010:
MSMT Foundations
in
Tucson, AZ |
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Contribute to HotWire |
Contributions Welcomed
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. We can be reached by e-mail at
HotWire@ReliaSoft.com,
or by standard mail at 1450 S. Eastside Loop, Tucson, AZ
85710-6703, USA. |
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Copyright © 2009 ReliaSoft
Corporation, ALL RIGHTS RESERVED. |
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