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Crankshaft Design
is a software developed to meet the needs of many manufacturers and tuners in the develops and optimization of the
crankshaft. This software is of essential help to identify the best solutions of balance and inertia for
each specific engine and every specific need, in order to
optimize performance, driveability and reliability. |
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Features
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The crankshaft as well as a structural point of view must also be studied for two fundamental aspects, the balancing of the forces generated by the movement of the reciprocating masses (piston, piston rings, piston pin and
small end of the connecting rod) and those rotating (big
end of the connecting rod, the crank pin), and also by the inertia that the crankshaft is able to offer.
In a single-cylinder engine, unless you introduce counter-rotating shafts, balancing can be only partial, and how to choose this partial balancing has always been the subject of discussion on what might be the best, in fact there isn't a better solution in absolute, but the optimum should be chosen according to the characteristics of the engine and of the vehicle for which the engine is employed. |
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Same goes for what concerns the crankshaft inertia, lighter, heavier, holes, no holes, are questions that recur over time,
at which isn't possible to give an answer because also for this aspect the best solution depends on the characteristics of the engine and its use.
In view of this, in practice, it makek the initial choices and then on the basis of tests and repeated attempts are made any changes, this process is long and laborious and often do not know if the solution found is really the best.
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The software Crankshaft Balance Design may appraise in advance the technical effects that the choices
of balance and inertia give in terms of performance and reliability in relation to the characteristics of the engine and
of the vehicle on which it is applied, allowing you to quickly find the optimal solution.
The software is structured in four sections that allow to analyze, to
calculate, and to develop, the crankshaft in the best way.
CRANKSHAFT ANALYSIS |
In this section the software
calculates the main features of the crankshaft that
you've, or that you want develop, in fact calculates quickly
WEIGHT -
BALANCE - INERTIA of the crankshaft. |
CRANKSHAFT DESIGN |
In this section the software calculates DIMENSION and
POSITION of the COUNTERWEIGHTS, or of eventuals HOLES,
to have a determined crankshaft balance, showing in the
meantime how are modified inertia and weight. |
ENGINE PERFORMANCE CALCULATION |
In this section the software calculates how changes the POWER CURVE of the engine in function of
the choices of
BALANCE and INERTIA that you've made on the
crankshaft. |
VEHICLE PERFORMANCE CALCULATION |
This section avalaible in the version PRO of the
software allows to calculate the VEHICLE PERFORMANCE
keeping in account how the features of the crankshaft
influence the engine power, and the behavior in the gear shift phase. |
Below we will show in detail how the software works in the different
areas.
CRANKSHAFT ANALYSIS |
The software allows to calculate the main
features of the crankshaft in a simple manner.
In fact is sufficient to enter the informations of the slider crank (stroke,
and weights of the parts), and some data that allow to
define the crankshaft. In this regard the software offers different data entry opportunities to
meet all the needs. |
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If you've made the classic experimental
test to calculate the balance, you can enter in the software
the value of the weight balance found, and the software in
function of the slider crank weights will calculate quickly
the BALANCE of your crankshaft. Moreover if
you measure the WEIGHT and the maximum diameter
of the crankshaft, the
software will calculate an estimate of the INERTIA of the crankshaft itself. |
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If you've the three-dimensional drawing of the crankshaft, from
your CAD 3D you can easily take over the gravity position, and the WEIGHT
of the crankshaft, thanks at these data the software will
calculate quickly the BALANCE of your
crankshaft in function of the slider crank weights. |
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If instead your crankshaft has a classic full circle shape, or
you want develop a crankshaft of this type, the software thanks
the main dimensions will calculate automatically WEIGHT,
BALANCE and INERTIA of your crankshaft. |
If in the crankshaft are already presents counterweights, or holes,
in the software is possible easily to enter their
characteristics in order to take into account in the
calculations and to see how they affect WEIGHT, BALANCE and
INERTIA. |
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After to have entered the crankshaft data in the modality
that you prefer, and the features of the slider crank, the
software Crankshaft Design calculates WEIGHT, BALANCE, and INERTIA
of the crankshaft, both taking into account of the
counterweights and of the holes, both excluding them, in
this way it will be easy to understand too
the characteristics of the initial geometry of the crankshaft, and to evaluate the possibility of modifications. |
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In addition to the calculations, the software draws
the geometry of the crankshaft that you entered,
allowing you to assess whether the data is correct and where there
is space for any modifications improvements. |
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CRANKSHAFT DESIGN |
If you want modify an existent crankshaft, or you want study
a new crankshaft, after the analysis phase which allows to
have a complete picture of the situation, the
software Crankshaft Design allows to study easily the
interventions to be carried out on the crankshaft to obtain
BALANCE and INERTIA that you want. |
The software allows in fact to calculate automatically
position and characteristics of the counterweights that are
necessary to achieve a determined balance.
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For first you must
choose the percentage of balance that you want
obtain. |
In addition you can
indicate the number of counterweights that you want
use, the thickness of the counterweight, and the
material (density) |
Finally you can
choose if the position of the counterweights must
generate the minimum, or the maximum, inertia. |
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At the end of the
calculation the software provides you all the informations of the counterweights that
you should use: |
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It also shows you how change the characteristics of
the crankshaft for the application of the
counterweights, and the relative drawing in scale: |
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This section of the software Crankshaft Design
can be used both to calculate the counterweights
of a crankshaft that has never been balanced. |
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Both to modify the balance of a crankshaft which has a different balance from
what we want. |
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If for example you've
already a crankshaft with a balance of 50% and you
want to go at a balance of 40%, the software will calculate
dimensions and position of the hole to make on the crankshaft, if instead you want increase the
percentage of balance, the software will indicate you, position
and characteristics of the additional counterweight to use. |
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The software allows also to see the balance and the
inertia that you obtain using determined counterweights, or
making specifics holes. |
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Shows you the drawing in scale and how change WEIGHT,
BALANCE, and INERTIA with the new counterweights and
holes applied. |
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ENGINE PERFORMANCE CALCULATION |
The choices of BALANCE and INERTIA in
addition to affect
the forces and the vibrations that you've on the chassis,
affect the engine performance. In fact in function
of the BALANCE that you choose change the forces
acting between piston and cylinder, and on main and crankpin bearings, and therefore on the mechanical friction losses, while the INERTIA affects the
crankshaft speed during the engine cycle, and therefore
modifies the fluid dynamic behavior of the engine, and the relative efficiency.
The software Crankshaft Design is able to calculate the
MECHANICAL LOSSES in function of the choices of BALANCE
that you make, and to see how changes the ENGINE POWER CURVE in function of the crankshaft INERTIA.
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In the software you must enter the main technical
data of the engine, and the power curve detected at
the dynotest. |
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At this point
entering the balance percentage, and the crankshaft
inertia (you can use also the values calculated in
the phases of ANALYSIS, or of DESIGN),
the software will calculate how change the power
curve, the power lost for mechanical friction, and the
forces acting on the chassis. |
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In addition to the global data it also shows the
graphs of all the quantities calculated as a
function of the engine speed. |
POWER |
LOST POWER |
AVERAGE VERTICAL FORCE |
MAX VERTICAL FORCE |
AVERAGE HORIZONTAL FORCE |
MAX HORIZONTAL FORCE |
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This section of the software Crankshaft Design is fundmental
to improve the engine performance in the direction that you want acting on the crankshaft. In fact the
software allows to compare the differents solutions, and therefore to find immediately, that
optimal for your needs. |
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Thanks to the software
Crankshaft Design you can therefore study the
interventions to make on the crankshaft as balcance,
and as inertia, to model the power curve for your needs.
You can then work to shift the maximum power peak,
or to have more extension, or to play with inertia
to soften the torque curve, etc., identifying the
optimal solutions quickly and accurately. Moreover
you can always to evaluate how change the forces on the chassis in function of the choices that you make,
managing therefore also eventuals problems related
to the vibrations. |
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VEHICLE PERFORMANCE CALCULATION |
In the version PRO of the software Crankshaft Design is
possible to see also how the choices of
BALANCE and INERTIA affect the
vehicle performance.
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In the software you must enter the features of the
vehicle, of the drive wheels, and of the
transmission. In addition to the main data, the
software also allows you to provide information on
the center of gravity of the vehicle, and on the
grip conditions, so you can also to
simulate the acceleration phase in the real
conditions, taking into account the possibility or not
to use all the available power. In the
software you can also indicate at which engine speed
you want make the upshift gear, so is possible to
evaluate the
vehicle behavior in the real operation
that you want perform. |
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At the end of the
calculation the software Crankshaft Design shows the
behavior of the vehicle in all the phase of
acceleration. You can therefore to compare the performance in function of the choices of BALANCE and INERTIA
analyzing the graphs of:
ENGINE SPEED |
SPEED |
ACCELERATION |
and also see the time needed to reach the different speeds, and the speeds
that are reached in the various gears, with the
relative time to reach them. |
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As you've seen,
thanks to the software Crankshaft Design, to develop, and to
improve, your crankshaft, becomes really easy, and you can
really increase the performance of your engine, and of your
vehicle, acting also on the crankshaft in the direction of
your needs! Besides are summarized the functionality of the
two versions of the software. |
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BASIC |
PRO |
crankshaft analysis |
X |
X |
crankshaft design |
X |
X |
engine performance
calculation |
X |
X |
vehicle performance
calculation |
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Purchase |
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NT-PROJECT - Ferrara (Italy)
- info@ntproject.com |
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