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How to choose the right damper dyno
Models:
All crank type units are designated
by the horsepower of the motor. As an example, the 3VS has a 3 hp motor
and the "VS" means variable speed.
Software:
Same on all model. Latest version always available for download and use.
Frame/size: The 2–3–5VS all
share the same frame and components.
The 10-20VS use the same frame.
The 30VS is a unit all of its own.
Strokes: Up to 2.0” on the
2-3-5VS.
Up to 6.0” on the 10-20-30VS.
Customizable to user.
Velocity: This is based on
horsepower, stroke and internal gear ratio and to a degree the sensor range.
We can alter the ratio to get different
velocities.
Keep in mind, if the crank is turning at the
same frequency, by running at different strokes, the user gets different
velocities. When trying to run higher velocities, the machine may become
horsepower limited.
Force:
We can make some generalizations on force capability, but it also depends on the
type of curve. A linear damper curve draws the power differently than a
digressive curve.
HP =
F
(lbs) x
V
(in/sec) / 6600 or
KW =
F
(kN) x V (m/sec)
and 1 HP = 0.746 kW
Roehrig Engineering
will always offer to test your damper for you to best
determine the proper unit. We can provide you the data to examine and
using our free demo software, available on our website, you can decide for
yourself if the results were achieved.
Crank
type comparison table
|
MODEL |
MOTOR |
VELOCITY (PEAK) |
STROKES
(CUSTOM AVAILABLE) |
WAVE FORMS |
POWER REQUIREMENTS
(VAC) |
SPECIMEN |
DESIGN |
|
|
|
(on max stroke) |
|
|
|
|
|
Max Stroke |
SINE |
CUSTOM |
TRACK |
220 I |
220 III |
380-400 |
440 |
AREA |
|
|
|
|
Standard |
Optional |
|
|
|
|
|
|
|
|
PLAY |
Step Up/Down Transformers Avail |
std column |
|
|
|
(hp) |
(in/sec) |
(inches) |
(inches) |
|
|
BACK |
|
|
|
|
(inches) |
|
| STAND. |
2VS |
2 |
20 |
NA |
1.0, 2.0 |
2 |
Y |
NA |
NA |
Y |
N |
N |
N |
29 |
TABLETOP |
| 3VS |
3 |
38 |
38 |
0.5, 1.0, 1.5, 2.0 |
2 |
Y |
NA |
NA |
Y |
Y |
Y |
Y |
28 |
TABLETOP |
| 5VS |
5 |
38 |
38 |
0.5, 1.0, 1.5, 2.0 |
2 |
Y |
NA |
NA |
Y |
Y |
Y |
Y |
28 |
TABLETOP |
| 10VS |
10 |
64 |
90 (138) |
0.75, 1.0, 1.5, 2.0, 3.0,
3.9 |
3.9 (6.0 Option) |
Y |
NA |
NA |
Y |
Y |
Y |
Y |
33 |
FLOOR MNT |
| 20VS |
20 |
64 |
138 |
0.75, 1.0, 1.5, 2.0, 3.0, 3.9, 6.0 |
6 |
Y |
NA |
NA |
N |
N |
Y |
Y |
33 |
FLOOR MNT |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(kW) |
(Met/sec) |
(mm) |
(mm) |
|
|
|
|
|
|
|
|
|
| METRIC |
2VS |
1.5 |
0.51 |
NA |
25, 50 |
50 |
Y |
NA |
NA |
Y |
N |
N |
N |
735 |
TABLETOP |
| 3VS |
2.2 |
0.97 |
0.97 |
15, 25, 40, 50 |
50 |
Y |
NA |
NA |
Y |
Y |
Y |
Y |
710 |
TABLETOP |
| 5VS |
3.7 |
0.97 |
0.97 |
15, 25, 40, 50 |
50 |
Y |
NA |
NA |
Y |
Y |
Y |
Y |
710 |
TABLETOP |
| 10VS |
7.5 |
1.63 |
2.3
(3.5) |
15, 25, 40, 50, 75, 100 |
100 (150 Option) |
Y |
NA |
NA |
Y |
Y |
Y |
Y |
840 |
FLOOR MNT |
| 20VS |
15 |
1.63 |
3.5 |
15, 25, 40, 50, 75, 100, 150 |
150 |
Y |
NA |
NA |
N |
N |
Y |
Y |
840 |
FLOOR MNT |
What kind of dyno do you need?
Roehrig makes a large variety of testing equipment to
fit a large variety of needs as well as budgets.
If budget was not a problem, the choice would be
easy, but we always have to think of cost vs. function.
We have sold many 2VS’s to people that needed more
power or velocity or more stroke but they did not have the capital to afford a
more expensive unit.
In the end, having some data is better than
having no data.
If you have to be able to run displacement data from
the race track or if you must run custom wave forms such as square waves, sine
on sine or frequency sweeps, etc. then Roehrig Engineering’s solution is the EMA
series, Electro Magnetic Linear Actuators.
This series of actuators provides superior
performance to a hydraulic solution at a fraction of the cost.
Please go to the EMA section of our website to find
out more.
If you have to perform a sine wave test then there is
nothing better than our line of crank type dynamometers.
Roehrig crank type dynamometers are designed to
develop a sine wave as the input wave form. They do this using a bolt in
an offset hole on a crank shaft. This then drives the yoke to produce a
sine wave. Our models provide a large variety of different parameters
designed to fit your damper testing needs.
Our models are based on horsepower, velocity
capability and strokes available.
They run through a belt drive reduction to
turn the crank head at varying frequencies.
We have set up the units to achieve a wide variety of
performance envelopes.
Chances are if one of these is not right in
standard configuration, then we can custom fit changes to configure it right.
The 2VS, 3VS and 5VS are all built on the same table
top platform. They differ in the horsepower of their motor. The hp
of the unit allows for more velocity and greater force capability.
These are meant for table top use.
The
2VS
is the entry level unit designed to get the user started down the path of damper
learning, rebuilding and tuning. It is ideal for the short track racer,
dirt or asphalt. It has some limiting features that keep its price at an
inexpensive level yet deliver the information the user needs. Due to hp,
gear ratio and motor drive restrictions, it is ideal only up to about 1,200 lbs
and 10 in/sec. In standard form, the crank is limited to two strokes, 1"
and 2". It is a user option to upgrade to the 5VS crank.
The
3VS
has more power, more strokes and upgraded crossbar and load cell package to meet
the requirements of this power.
The
5VS
has the most power we can fit in a small compact tabletop size.
From tabletop to floor models, we have the 10, 20 and
30VS and 40VS.
Again, how fast do you need to test, how much
force do you see and what stroke do you need to run?
Do you have to run for 3 cycles, typical, or do you
want to do durability testing to 1,000,000 cycles or even to failure?
The
10VS
and
20VS
are interchangeable, except for power.
The bigger motor in the 20VS allows it to go
faster and keep pulling beyond the limits of the 10VS.
The 20VS also comes standard with the largest stroke,
6 inches (150 mm) and a 720 pulse encoder for increased low speed testing.
These remain option on the 10VS model.
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