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September 2009 |
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News Letter |
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SLA: Static
Load Assist
Roehrig Engineering has developed a new
system designed to get more out of the EMA series of Electromagnetic
Linear Actuators. The Static Load Assist, SLA, addition can increase the
capacity of your EMA by up to 50%. The EMA has always been good at
frequency development, frame tested to 500 Hz. Now with SLA, the
more static side of testing becomes the next avenue for an already
versatile machine. The system works by adding low frequency force
component to the actuator to handle the static force while allowing the
actuator to work on the dynamic side.
SLA can be programmed to add force dynamically to the actuator and
thus increase the capability of the EMA. It can also be programmed
to add a certain amount of force at a series of speeds. For the
NASCAR teams, this means bump rubber testing can be expanded for testing
up to 3,000 lbs on a 2K EMA. For very low bleed high rebound
dampers, the addition of static load assist allows the EMA to better handle
the dampening forces involved.
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Figure 1: A vey low speed PVP running on a very
aggressive Lin-Dig damper. It has been run at 0.2, 0.4, 0.6, 0.8 and 1.0
in/sec to generate these curves. By closing the open jet, a force
was reached that the EMA, without SLA could not finish the test.
By adding the low frequency tracking mode of SLA, the EMA ran the test
above the machine spec of 2,000 lbs. and without getting over 100
deg, quite a change.
The softest rebound curve (on the graph) is the
same damper, same setting with and without SLA.
The next strongest curve (orange) was done with SLA, the EMA could not
complete the test without it. The last (red) was just another run
to see how far it would go.
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Figure 1: Static Load Assist for low bleed damper
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Figure 2:
For these runs, a "dummy" shock with bump rubbers on was used.
Using a custom wave (relative move up, then down), tests were run to get
a Force vs. Displacement plot. By increasing the offset each run,
the test generated more force. You can see, by using the SLA,
the EMA was able to run well above 2,000 lbs.
For NASCAR teams wanting to use the EMA to rate bump rubbers, SLA allows
them to do it with less wear on the EMA and at a greater force than
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| Figure 2: Static Load Assist for bump rubber testing |
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Aero Loader
Roehrig
Engineering is currently working on developing a set (4) of
Aero-Loaders for a 7 Post system. Roehrig was contacted for help
when the response rate of the current aero loaders were not fast enough to support the requirements of the
customer. When completed, it will be Roehrig's first
foray into the 7 Post world of testing. Stay tuned for more
information in the coming months. Once the system is
integrated, we'll post links and data of this new technology.
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Durability
Roehrig Engineering has completed another durability machine. This
particular machine was ordered to be able to run up to 4
specimens at a time. The user programs the test to run
for "X" number of cycles. They can then chose to stop at
certain intervals to run a series of performance tests to better
measure the long term viability of the damper(s).
* It has an automated crossbar for raising and lowering
the upper mounting plate as well as a self-clamping feature
to make the machine more hands-free.
* It also incorporates auto cooling that is user defined
so that integrated air-knives directed at each individual
specimen can be set to provide air cooling during the test.
* It can be configured to run 1 - 2 - 3 or 4 dampers at a
time, using Roehrig Engineering's
DLT: durability Life
Testing software. This software allows the user to set a
dwell time (1 or two) and a performance test nested within
the total cycle count. Thus the user can run for "X" number
of cycles, run a performance test and then go back to the
dwell speed for as long as chosen.
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High Velocity Ability:
HV
Roehrig Engineering delivered our most powerful machine as
well as our fastest to
date!
JGRMX - SPIKE Hardcore Energy Yamaha Team Presented by
Toyota
took delivery of their new 6K-EMA-HV. This machine allows
them to test their dampers over 18 inches and up to 8 meters / second!!! It
uses our Electro Magnetic Linear Actuator technology coupled
to a high velocity mechanism to produce the affects of
landing off a high jump. With this technology mated to
our already versatile series of EMA's, Roehrig Engineering is
opening new ways to test and measure your dampers.
This follows the delivery of a similar machine to
KYB. |
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Trade Shows:
Visit us in booth #423
PRI -
Performance Racing Industry Show December
10-12, 2009 in Orlando, FL
Visit us at booth #'s 4542-4544-4546 to see our
latest damper, spring, bump rubber, elastomer and bar rating
equipment
has developed a new line of Advanced Forced based Linear
Actuators designed for your spring testing needs.
From valve springs
to the extremes of coil bind
testing, they can meet your every
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