induDrive - SolidWorks

induDrive
Calculation of Smooth Driving Motions for Kinematic
Simulation Programmes - Generation and Evaluation of
Cam Disks
induSim GmbH Geschäftsführer Tel. +49 7345 929287-0
Centrum für industrielle Simulationen Dipl.-Ing., Dipl.-Wirtsch.-Ing. Fax. +49 7345 929287-50
Benzstr. 15 D-89129 Langenau Georg Zeller www.indusim.de

Table of Contents
Table of Contents ������������������������ ..���� 2
What is induDrive? ����������������������� ����� 3
First Step: Synthesis of Motion �������������������� .3
Second Step: Analysis of the Contour ����������������� ..4
induDrive Basic ����������������������������� 5
Graphical Motion Design according to VDI 2143..������������� .5
Graphic and Tabular Display of Motion Functions ������������ ..6
Determining Curve Contours on the Basis of Synthesis Calculations ���� .7
induDrive Result ���������������������������� ..7
Advantages of induDrive at a Glance � .���������������� .� ..10
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What is induDrive?
With the software tool induDrive kinematic
simulation programmes are extended by the
possibility to generate motion sequences
without shock and jerk.
Due to convenient operation and seamless
integration into different CAD programmes the
calculations during the construction process are
carried out by the design engineer without
special knowledge. Thus, e.g. cams and
tappets can be constructed and optimized
quickly.
induDrive
offers the following kinematics laws according
to VDI 2143:
• rest
• linear
• 5th-degree polynomial
• square parabola
• modified trapezoid
• modified sine
• sine-linear-combination
• harmonic combination
• simple sine
• inclined sine
• spline
• and others ...
induDrive
can be integrated into the following
simulation programmes:
• visualNastran Motion
• Dynamic Designer Professional for
Solid Edge
• Dynamic Designer Professional for
Inventor
• Cosmos Motion 2007
• Soldiworks Motion 2009
First Step:
Synthesis of Motion
A theoretical drive moving the elements
exactly as requested is allocated to the
output elements (e. g. tools in a
packaging machine). By means of
induDrive these motions can be preset,
optimized and transferred to the
simulation programme.
For this so-called �motion design� many
functions, auxiliary means and
evaluations are available in induDrive.
If the motion fulfils the requirements the
model is completed by the kinematics
tool up to the cam disk as far as this did
not occur at an earlier time. The roller
centre is followed up relatively to the
rotating drive shaft, a trace curve (= centre path) is generated. This curve can be read into
induDrive and directly transferred into the CAD programme, e. g. into a sketch. Thus, a curve
contour which exactly fulfils the motion presetting can be deduced by an offset.
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Second Step:
Analysis of the Contour
Indeed, the contour generated by the
synthesis can not always be realized: The
curve contour may be too steep, may cause
clamping or even cut itself. Therefore, an
analysis of the contour is absolutely
necessary.
Initially, induDrive statically analyses the
curve contour and evaluates it with respect
to the gradient and radii of curvature.
Following the kinematics in the simulation
programme is �reversed�, i. e. driving
actually takes place by the generated curve
contour, the forces of the joints are
measured.
construction
simulation
Blister machine of Messrs. Somatec
Due to the fact that the masses and the appropriate moments of inertia are known to the 3D
construction, e. g. the Hertzian stress can directly be determined on the basis of the contact
forces, dependent on the driven velocities. Analyses of limiting value can be carried out.
For an efficient and optimal drive layout a close
connection between construction and simulation
is essential.
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induDrive Basic
In the kinematics programmes drives can be defined. Functions can be indeed entered in a
limited extent. But, if the requested function consists of different sections their definition via
functional terms with distinction of cases gets rapidly very complex and error-prone due to
that.
Graphical Motion Design according
to VDI 2143
induDrive closes this gap. By means of
a graphic function editor it is possible
to define motion functions in sections
according to VDI 2143.
All laws of these guidelines are
supported. Marginal values thereby are
exchanged with the following, but also
with the previous section.
Input mask: entering of the kinematics laws
graphically or in table form.
Drive unit of a weaving machine of Messrs. Griffith Textile,
England
One example: A linear segment is completely
ascertained by its initial point and its endpoint.
Now, a following fifth-degree polynomial gets
automatically the velocity of the linear segment
at the beginning.
This adaptation also occurs vice versa: A
polynomial preceding the linear segment gets
the velocity of the linear segment as the final
velocity. That way the consistency of the first
and second derivation is automatically
assured.
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Graphic and Tabular Display of Motion Functions
The calculated function (including derivations) is displayed graphically, but also in table form
(depending on how it is transferred into the respective kinematics programme).
Furthermore, the extremum of function and derivation is determined automatically. The
function course is clearly graphically displayed and can easily be evaluated. In the diagrams
graphical editing is possible. This facilitates the optimization of function courses
considerably.
The centre curve is transferred from the simulation
as a scatter plot. It can be transmitted both
as a spline into CAD systems generating the
geometry and into induDrive Result evaluating the
contour.
induDrive Basic offers the possibility for
administrating several functions in different
editor windows. The visualization and
adaptation of these functions occur in a
common diagram.
The transfer of induDrive data into the
kinematics programme occurs via direct
interface (API).
All degrees of freedom of the ongoing model
are displayed and selected for the
calculation via induDrive. A simulation with
new defined drives can directly be carried
out.
Several functions of motion can clearly be viewed at
induDrive
has a direct interface to the following CAD
programmes:
• Inventor
• Solid Edge
• SolidWorks
Curve contours can be read into all other
CAD programs only via DXF interface.
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induDrive
is suitable for generating of:
• plane curve contours
• three-dimensional cylinder
curves or similar drives
• slotted links
and for programme presetting for
electronic drives.
Determining Curve Contours on the Basis of
Synthesis Calculations
Following to the calculation in the kinematics tool
the positions of the roller centre are measured
relatively to the rotating drive shaft and curve
blank respectively and are automatically
transferred into induDrive.
The points can directly be transferred into some
CAD systems via API interface, e. g. as a spline
into a sketch. The real contour can directly be
generated by an offset.
For further CAD systems the data are saved as ASCII data and imported into the CAD
system or exported as a DXF file and again imported into any CAD system (the module
induDrive Result offers this possibility).
induDrive Result
After carrying out a curve synthesis the generated
curve course must be analysed. For this purpose
the scatter plot transferred from the kinematics
tool is converted into a curve course (only for
plane cam discs) by means of a circular
interpolation (= circular arcs tangentially merged
into each other). By an offset the �hard� curve
contour can be generated also in this case.
The position of the articulated joints of levers or
tappets is automatically transferred from the
kinematics tool - relatively to the cam disc - into
induDrive Result. By these data the transmission
angle between roller and curve contour is
determined and displayed.
Exemplary drive of 2 addicted axes
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Circular interpolated curve contours can be evaluated by
means of induDrive Result.
The coefficient of curvature and the transmission angle are
displayed.
Extensive auxiliary means provide
information on the course of the
gradient angle onto the curve
contour. Problem areas are
analysed.
Due to the close interaction of the
individual programme modules
modifications can be carried out in
a rapid, efficient and goal-oriented
way no matter whether they are of
geometrical type or in the definition
of the functions of motion.
Simulation and construction work
are closely connected with each
other.
The contour generated by
induDrive Result via circular
interpolation can be saved as a
DXF file and directly read into NC
systems by a DXF interface.
In order to facilitate the handling of
NC programmes the number of arcs
can be reduced: The contour has a
preset tolerance limit (e. g. 0,01
mm). Therewith, a lot of very small
circular arcs can be combined into a
bigger circular arc, which means a
facility in particular for older
controls.
Via induDrive Basic curve contours can be modified and transmitted into CAD programmes.
Therewith, the effect of manually modified curves on the mechanism can be analysed.
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Curve contours can purposefully be modified and
tested. Transmission functions need not to be known.
Circular interpolated curve contours can directly be
read into CAD sketches.
The circular interpolated paths can be
exported into excel, entered as DXF file and
are thus accessible to other CAD or NC
programmes.
induDrive can be used in connection with
the operating systems
• Windows NT
• 2000
• XP
and works bilingually in German and
English, depending on the language of the
operating system.
induDrive
requires the following from your
system:
• Operating system: Windows
2000, XP
• Hardware: commercial CAD
processor
• Memory requirements: approx.
20 MB
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Advantages of induDrive at
a Glance
Optimized Construction: Due to
optimized functions of motion stress of
the machine components and noise
development are
reduced � efficiency and life-time of the
machine increase.
Reduction of Development Time: The
system is already dynamically tested on
the basis of the simulation model. First
experiences regarding functionality can
be made. The generated cam
geometries usually work straight away.
Time-consuming and non-documented
modifications of cam discs are not
necessary anymore. The machine is
faster ready for use.
Exemplary drive of a controlled linear motion
Reduction of Construction Expenditure: Manual calculations, e. g. of motion functions or
transmission angles, will be dismissed. Accelerations etc. are calculated without complete
simulation of models. The direct data exchange reduces many sources of error.
Reduction of Assembly Costs: Due to increased accuracy of construction necessary
adjustment work during the assembly and consequently the assembly costs are reduced.
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Increase in Creativity and Productivity:
Complex mechanisms are more comprehensible � extensions, improvements or alternatives
which were a victim of lack of time can now be carried out.
simulation programme
e. g.
Dynamic Designer ,
Solidworks Motion
CAD
indu Drive
calculation programme for smooth -
motion
program
calculates drives
evaluates curve contours
describes the connections
for dynamic
multi-body simulation
determines all geometric data
Interaction of different programmes for calculating cam discs.
Ask for further information on induDrive:
induSim GmbH
Centrum für industrielle Simulationen
Benzstraße 15
89129 Langenau
Managing Director: Georg Zeller
Phone ++ 49 (0) 7345 / 929287-0
Fax ++49 (0) 7345 / 929287-50
www.indusim.de
georg.zeller@indusim.de
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