PCB Mechanical Analysis (Vibration [US Patent #6,678,627]/ shock), Mechanical Stress Screening, Circuit Card and Electronics Reliability,
Test Development, Prognostics and Health Management (PHM)
Evaluating fatigue life of electronic circuit cards is a very complex
problem (Modal Illustration). For years,
simple empirical formulae have been used to estimate life capabilities.
These formulae were used to replace the very detailed analysis required
for prediction of fatigue life, since detailed analysis was beyond the
capability of all but the largest of corporations. But product understanding
could not be accomplished with equations and as a result, extensive and
expensive test programs were used to obtain product quality.
Modern computers provide
the number crunching capability necessary to solve the complex fatigue evaluation,
CirVibe provides the model development and methods. Testing remains an important
part of understanding product life, but CirVibe makes the product development
Environmental Stress Screening vibration has been established as the most
effective means of detecting mechanical production flaws. CirVibe was developed
for establishing, evaluating and optimizing environmental vibration stress
screens for assurance of quality of components, PWAs and electronic assemblies.
However, its ease of use makes it an ideal tool for all stages of the design
and development process including design ruggedization. CirVibe performs detailed
Finite Element Analysis (FEA), but is not a typical FEA program. Methods used
in CirVibe were developed by a team of engineers including test, analysis,
reliability and production specialists, with the primary goal of product understanding.
FEA model generation is highly automated. Automated model generation, modal
analysis, detailed component stress calculations and fatigue evaluations are
performed from simple geometric descriptions of the hardware. CAD interface
programs further simplify the analysis setup, allowing models to be developed
CirVibe methods provide
product understanding during demanding product development schedules. CirVibe's
highly automated pre- and post- processors eliminate the need for a user to
be a FEA specialist, yet FEA specialists can use CirVibe for time saving advantages.
Time is spent evaluating and applying results, rather than spent with input
detail and error chasing. The ease of analysis permits evaluation of parameters,
support modes, and component position for developing optimum screens or for
obtaining maximum life when used during the design process. Since actual test
data can be entered into CirVibe, fatigue damage differences due to changes
in frequency or transmissibility response of test units can be easily evaluated.
By concentrating on the results, the user can gain an understanding of life-usage
and draw on experience to optimize environmental stress screens or optimize
design capabilities. The ability to rapidly analyze variations in support
conditions and vibration requirements make CirVibe an ideal tool for evaluation
of Commercial Off The Shelf , COTS hardware.
to End User of CirVibe:
Simulate product prior to hardware availability.
Capability to include actual test data after hardware is available.
Optimize stress screening for effectiveness
Reduce Environmental Stress Screen costs, Development Costs,
and time to market
Increase Product Reliability
Understand vibration life usage at component level (life fractions can
be defined for all components)
Mentor Graphics Expedition PCB:
Mentor Graphics Board Station:
The Uni-directional interface with Mentor Graphics allows geometric data required
by CirVibe to be read directly from Mentor Graphics Board Station. Board shape,
component details and positions are transferred into CirVibe for use in detailed
The Uni-directional interface with Mentor Graphics Expedition PCB uses the ASCII
file created by the pulldown menu File>Export>ASCII...
Similar to Mentor Graphics Interface programs, uses "*.MIN" file output by OrCAD.
Similar to Mentor Graphics Interface programs, uses "*.CAD" file output by Zuken Redac.
Similar to Mentor Graphics Interface programs, uses "Design Database ASCII file" output by PADS PowerPCB.
The Uni-directional interface with Cadence Allegro allows geometric data required
by CirVibe to be read directly from data files containing component and "pin"
location information.. Component details and positions are transferred into
CirVibe for use in detailed analysis.
General CAD Interface:
The General CAD Uni-directional interface reads component names and reference
geometries from one ASCII file and pin location for all components from
a second ASCII file. Component details and positions are transferred into
CirVibe for use in detailed analysis.
Highly Automated - Detailed Analysis
Models can be developed in minutes
Accelerated Life / Fatigue Damage Calculation
For use in DT&E (Design, Test and Evaluation), Product Development,
Environmental Stress Screening and Reliability
COTS vibration life usage evaluation
For use with Component, Board or Assembly Electronics
Analytical Optimization of ESS Vibration
of CirVibe for COTS - Vibration
All electronic systems
experience shock and vibration - loading that occurs when transported
by ground, air, sea or rocket. Often an equivalent life vibration requirement
(Accelerated life test) is established for testing equipment to verify
its capability to survive the loads experienced over a life of service
in the field.
All involved in the
COTS final usage (the designer, producer, system developer and end user)
should be confident of the capability of the hardware to meet the design
goals. Often hardware is qualified for use with a single qualification
test and application of a simple empirical formula for life verification.
One test is not much assurance that all similar products can meet the
requirements. Electronic systems have potential for large variations in
geometric features and material properties that can have substantial effects
on vibration life capability.
programs can be used to cover uncertainty associated with changing requirements
(upscreening), or allowance for parameter variations.
CirVibe tools make
the testing process effective and cost efficient. With CirVibe tools,
rapid analysis of variations in geometries, properties, vibration spectrums
and support conditions is possible. Results are shown in life usage on
a component level basis, providing product understanding never before
available at this level of effort.
in test programs supported by CirVibe analysis, all involved in COTS can
have understanding and confidence in the vibration life capabilities.
- Heat Transfer Analysis
Capabilities and Features :
to CirVibe -- Currently under development
Uses eased input similar to CirVibe
©2002 CirVibe Inc. All rights reserved.
CirVibe Inc., Plymouth, MN (763) 559-5166