Hello, I am Clément Ganier with Siemens PLM software. Today I'm going to present you the port
compatibility between powertrain and 3D mechanical libraries.
In LMS Imagine.Lab Amesim, vehicle submodels of the powetrain library can now be connected to the
components of the 3D mechanical library.
Actually, the ports of vehicle, chassis,
suspension and tires are now compatible with the ports of the 3D mechanical components.
Two practical applications will be showed here,
in order to illustrate the interesting possibilities of this feature.
So first, we will see the possibility of multi-axle modeling, and then, an example
of an advanced suspension model, MacPherson type.
So let's take this very simple model of a truck with three axles.
So this is the chassis model here, and if we have a look at the external variables,
we see that the ports type at wheel are now 3D mechanical ports.
So, variable exchanges at ports are the forces in three dimensions,
the torque in three dimensions and, in the other way
all the kinematics elements in three dimensions.
So this chassis is connected through what we call 3D nodes,
in order to model the front axle here, the center axle and the rear axle.
You can note that the suspension components
have also 3D ports to be compatible with the nodes.
So, let's model four axles vehicle, just simply
by copy and paste these components here, and using another 3D node,
on top of these two, so we can cascade the 3D nodes together,
in order to model multiple axles vehicle. There is no limitation in number of axles.
So this was for the first example.
Now, I will open another model to show you another possibility of this feature,
which is the integration of an advanced model of MacPherson suspension,
inside a simple vehicle model.
So, we have the same model of chassis here, which is connected
to 3D mechanical components, here, to model the MacPherson suspension.
So this is for the front axle, and we keep
very simple suspension for the rear axle.
So the MacPherson suspension is modeled with elements of the 3D mechanical library.
So here, we can find a spindle, which is the blue element here.
Then we have the lower control arm here in green, which is this component here.
We have the spring and damper body in purple here, which correspond to this element
in the drawing, and we have the steering tie rod in brown here.
So, you can parameter this model with, what we called the "Hard Point".
So these are the coordinates of all the main points in 3D space.
So you can change the coordinate of the hard point, simply by editing the global parameter.
So here, I have open the global parameter window and
I can change the values of all these coordinates.
So, the purpose of such a model is to study the influence of all these
components on the vehicle NVH, noise, vibration and harshness.
So, for example, let's say we would like to have a sensitivity analysis on the
coordinates of the hard point, or we can choose to make an optimization
of the stiffnesses of the bushing.
So the stiffnesses of the bushings are these components here,
for the uper bushing, and these components here for the lower bushing.
So, let's have a very simple example with this model.
This is just a tip-in, tip-out manouver.
So I have launch the simulation with an input torque, a drive torque, here.
So at this moment, at two seconds we have a tip-in, and then a tip-out.
We see that the vehicle speed is increasing,
and we see that the longitudinale acceleration has this characteristic here.
We can notice that there is quite a huge peak in the oscillations,
that we can study, and then try to decrease.
Thanks to the 3D mechanical library, we have access to automatic creations of 3D animations.
By double-clicking on this icon, I will open an animation with
the MacPherson suspension, which is directly connected to the model.
I can animate this model, and have different views of the suspension.
At two seconds, we will see that the suspension spring is moving,
representing the tip-in phenomena.
Then, at 5 seconds, we will see the consequences of the tip-out, now.
So this view could help the user to understand what is the behaviour
of the suspension on the vehicle.
So, as a conclusion, we have seen two practical examples of the usage of this 3D ports compatibility
between powertrain library and 3D mechanical library.
So multi-axles vehicle and advanced MacPherson suspension model.
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