| In this issue: |
Issue 110,
April 2010 |
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Reliability HotWire is a service of
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Hot Topics |
Another Look at the Shape Parameter of the Weibull
Distribution (Beta)
It is well known that the shape parameter of the Weibull distribution, beta,
represents the failure rate behavior. If beta is less than 1, then the failure rate
decreases with time; if beta is greater than 1, then the failure rate increases with
time. When beta is equal to 1, the failure rate is constant. Assume
that we have two failure data sets. From one data set, the estimated beta is 5; from
another data set, the estimated beta is 3. Both have increasing failure rates. If
the two data sets were combined together, would the estimated beta for the overall
data set be a value between 3 and 5, or would it be a value outside of this range?
Could it be less than 1, which would imply that the combined data set has a failure
rate that is decreasing with time? In this article, we will use examples to show the
relationship between these betas.
To read more, see
http://www.weibull.com/hotwire/issue110/hottopics110.htm
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Reliability Basics |
Accelerated Degradation Analysis Using ALTA
Degradation analysis involves the measurement and extrapolation of degradation or
performance data that can be directly related to the failures of a product. Many
failure mechanisms can be directly linked to the degradation of the parts of a
product, and degradation analysis allows the user to extrapolate to an expected
failure time based on the measurements of degradation or performance over time. When
accelerated testing techniques are used to reduce testing time, the analysis of the
degradation measurements obtained at the accelerated stress levels can be
extrapolated to normal use conditions. In this article, we
will give an example that uses the accelerated degradation analysis tool in
ALTA 7.
To read more, see
http://www.weibull.com/hotwire/issue110/relbasics110.htm
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Tool Tips |
- How can I use ALTA to make
warranty predictions based on data from a quantitative accelerated life test?
- How can I quickly apply the same changes to the subordinate items of a
block in Lambda Predict 3?
To read more, see
http://www.weibull.com/hotwire/issue110/tooltips110.htm
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Latest Software Updates |
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New service releases are now available for
RGA (SR 7.0.3),
BlockSim (SR
7.0.11) and Lambda
Predict (SR 3.0.4).
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 |
 |
Advance
Registration Deadline
- The 2010 ARS North America will be held
at the Grand
Sierra Resort in Reno, Nevada from June 15 - 17,
2010 and the Early Registration Deadline is
April 23, 2010. Visit
http://www.ARSymposium.org/register.htm and register
now in order to save $200. Detailed information about
ARS, including the program matrix and venue, are
available online at
http://www.ARSymposium.org. |
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ASQ CRE Exam -
Once again, the ARS
Committee has partnered with ASQ to bring the
Certified Reliability Engineer Exam to the 2010 ARS
North America conference in Reno, Nevada, in June. The
exam will be offered on June 14, 2010 and the
application deadline for the CRE exam is April
30, 2010. Please register with ASQ at their website. |
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New Part Libraries -
ReliaSoft has created the Web portal
PartLibraries.org in order to
provide Lambda Predict 3 users with access to a convenient component data
repository that can save time and improve the
accuracy of reliability prediction analyses for
supported standards. Get the latest service release
for Lambda Predict 3 (Build 3.0.4) in order to take full
advantage of these new searchable part libraries.
While some component data is available to all licensed
users free of charge, an additional 300,000 commercial
components are available via a premium subscription. For
more information, please visit our Web site at
http://www.ReliaSoft.com/predict/part_libraries.htm
or contact our sales team at
Sales@ReliaSoft.com. |
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Upcoming
Public Training Event Calendar |
|
April 2010 |
|
April 19 - 23, 2010:
MSMT Foundations
in
Stockport, United Kingdom |
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April 19 - 23, 2010:
MSMT Foundations
in
Tucson, Arizona |
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April 19 - 21, 2010:
RS 521 Advanced Accelerated Life Testing Analysis
in
Bangalore, India |
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May 2010 |
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May 10 - 14, 2010:
MSMT Foundations
in
Singapore |
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May 10 - 12, 2010:
RS 588 DOE: Experiment Design and Analysis
in
Warsaw, Poland |
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May 11 - 13, 2010:
RS 511 Application of Reliability Growth Models in Developmental Testing and Fielded Systems
in
Tucson, Arizona |
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May 11 - 13, 2010:
RS 521 Advanced Accelerated Life Testing Analysis
in
Tucson, Arizona |
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June
2010 |
|
June 1 - 3, 2010:
RS 588 DOE: Experiment Design
and Analysis
in
Tucson, Arizona |
|
June 7 - 9, 2010:
RS 560 Fundamentals of Design
for Reliability
in
Pune, India |
|
June 14 - 18, 2010:
RS 540 Reliability and
Maintainability Analysis for
Repairable Systems
in
Kuala Lumpur, Malaysia |
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June 15 - 17, 2010:
International Applied
Reliability Symposium
in
Reno, Nevada |
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June 21 - 25, 2010:
MSMT Foundations
in
Bologna, Italy |
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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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Corporation, ALL RIGHTS RESERVED. |
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