Major differences between HALT and ED
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![Page 1: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/1.jpg)
Major Differences between
Random Vibration Tables and
Electro-Dynamic Shakers
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Overview
![Page 3: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/3.jpg)
Overview
• Random Vibration (HALT)
![Page 4: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/4.jpg)
Overview
• Random Vibration (HALT)
Highly Accelerated Life Test
![Page 5: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/5.jpg)
Overview
• Random Vibration (HALT)
Highly Accelerated Life Test
The test article is subjected to all 6 possible axes of motion (X, Y, Z, Roll, Pitch, and Yaw) at the
same time. This is subject to the limits of Newtonian Physics, where an object can only move in one
direction at any instant.
![Page 6: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/6.jpg)
Overview
• Random Vibration (HALT)
Highly Accelerated Life Test
The test article is subjected to all 6 possible axes of motion (X, Y, Z, Roll, Pitch, and Yaw) at the
same time. This is subject to the limits of Newtonian Physics, where an object can only move in one
direction at any instant.
Why? The Goal of HALT testing is to quickly find failures in a design. The
cause of the failure is then determined and the design is strengthened
and testing continues until failures occur at levels of stress higher than a
product sees in usual service.
![Page 7: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/7.jpg)
Overview
• Random Vibration (HALT)
Highly Accelerated Life Test
The test article is subjected to all 6 possible axes of motion (X, Y, Z, Roll, Pitch, and Yaw) at the
same time. This is subject to the limits of Newtonian Physics, where an object can only move in one
direction at any instant.
Why? The Goal of HALT testing is to quickly find failures in a design. The
cause of the failure is then determined and the design is strengthened
and testing continues until failures occur at levels of stress higher than a
product sees in usual service.
When? Usually during product
development, but can also
be done later to improve the
design.
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Overview
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Overview
• Electro-Dynamic (ED)
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Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
![Page 11: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/11.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
![Page 12: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/12.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
![Page 13: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/13.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences
![Page 14: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/14.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences Frequency
![Page 15: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/15.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences Peak Frequency
![Page 16: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/16.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences Peak Frequency Motion
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Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences Peak Frequency Motion Fixturing
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Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences Peak Frequency Motion Fixturing Displacement
![Page 19: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/19.jpg)
Overview
• Electro-Dynamic (ED)
May be used for the same purpose as HALT
Major Difference?
Limited to ONE axis of motion,
unless multiple tests are used
to move an object in 2 or 3
axes.
Other Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Wide band FIXED
frequency response to create
the PSD energy.
ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Wide band FIXED
frequency response to create
the PSD energy.
Approximately 20HZ to 12kHz with fairly flat average power.
ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Wide band FIXED
frequency response to create the PSD
energy.
Approximately 20HZ to 12kHz with fairly flat average power.
ED PSD is programmed into the controller to achieve a given
PSD curve.
![Page 24: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/24.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT
Wide band FIXED frequency response to create the PSD
energy.
Approximately 20HZ to 12kHz with fairly flat average power.
ED
PSD is programmed into the controller to achieve a given
PSD curve.
Typically the energy is concentrated in a given area of interest for the test, and is
usually based on empirical measurements of the
environment that the unit under test will need to endure
during its lifecycle.
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT The peak for any
individual random shock impulse is typically 10X the average providing
more headroom for any individual shock pulse.
ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT The peak for any
individual random shock impulse is typically 10X the average providing
more headroom for any individual shock pulse.
This is due to the shock hammers under the table
that produce shock waves.
ED
![Page 28: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/28.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT The peak for any
individual random shock impulse is typically 10X the average providing
more headroom for any individual shock pulse.
This is due to the shock hammers under the table
that produce shock waves.
ED Due to the differences in the way the table works it is unable to achieve large instantaneous
shock pulses.
![Page 29: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/29.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT 6 degrees of
freedom motion, X, Y, Z, Pitch, Roll and Yaw
ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT 6 degrees of
freedom motion, X, Y, Z, Pitch, Roll and Yaw
ED
Single axis at a time only.
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT 6 degrees of
freedom motion, X, Y, Z, Pitch, Roll and
Yaw
ED
Single axis at a time only.
One must shift the orientation of the part on axis at a time X, Y and Z
only.
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT
Fixtures are much lighter
than ED shaker fixtures.
ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT
Fixtures are much lighter than ED shaker fixtures.
ED
Sometimes massive to accommodate a heavier load with
more displacement.
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT
Displacement is on the order of millimeters, and not controllable.
ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT
Displacement is on the order of millimeters, and not controllable.
ED
Can move more than one inch,
typically about ½ cm.
![Page 39: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/39.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT ED
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Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Discovery test to rapidly find weaknesses using
accelerated stress conditions.
Find a weakness… Improve the weakness
ED
![Page 41: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/41.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Discovery test to rapidly find weaknesses using
accelerated stress conditions.
Find a weakness… Improve the weakness
There are many books and consultants available
on the subject of test design.
ED
![Page 42: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/42.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Discovery test to rapidly find weaknesses using
accelerated stress conditions.
Find a weakness… Improve the weakness
There are many books and consultants available
on the subject of test design.
ED
There are standards and MIL Specs written around
this type of testing.
![Page 43: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/43.jpg)
Key
Differences Peak Frequency Motion Fixturing Displacement Test
Design
HALT Discovery test to rapidly find weaknesses using
accelerated stress conditions.
Find a weakness… Improve the weakness
There are many books and consultants available
on the subject of test design.
ED
There are standards and MIL Specs written around
this type of testing.
The test engineer may often have the specs or standards imposed by a
customer
![Page 44: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/44.jpg)
Additional Differences
HALT ED
![Page 45: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/45.jpg)
Additional Differences
HALT ED
![Page 46: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/46.jpg)
Additional Differences
HALT ED
Can achieve a more severe
test.
Can use larger parts such as
motor housings or castings.
![Page 47: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/47.jpg)
Additional Differences
HALT ED
![Page 48: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/48.jpg)
Conclusion
• Neither HALT or ED shakers are necessarily
better than the other. It all depends on the
specific product and test being run.
![Page 49: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/49.jpg)
Conclusion
• Neither HALT or ED shakers are necessarily
better than the other. It all depends on the
specific product and test being run.
• In some cases, the test results from an ED
Shaker table can be correlated to a HALT
chamber table by running HALT discovery
testing after finding destruct points with an
ED Shaker, but it depends on the type of
part being tested.
![Page 50: Major differences between HALT and ED](https://reader034.fdocuments.us/reader034/viewer/2022051516/55ccfa37bb61eb312b8b461c/html5/thumbnails/50.jpg)
For more information,
please contact
Cincinnati Sub-Zero or visit
www.cszindustrial.com