PROFESSIONAL MOTORSPORT

SIMULATION SOFTWARE

Looking at 25 variables in one sight

We do agree that the animation might look a bit like a gimmick to the professional engineer.

But it enables you to look at about 25 parameters in one sight. That sometimes gives you a better understanding of the combination of data, especially if you are not an educated engineer.

And even if you do not have an engineering degree, you have a feel how a car should look like. So you quickly see if there is something wrong.

Middle of the zoomed area in plots is animation point

Screenshot of the LapSim GUI showing editboxes for time and distance point in animation

If you have zoomed in on a specific area in the plot menus and just subsequently select the animation, the animation will show you the situation at the yellow line of the plot menu.

Moving back to the plot menu, LapSim will go back to the area you were.

Can be very helpful to visualize on-car data

Screenshot of the LapSim GUI showing a front view of the complete vehicle, showing roll, pitch, heave, tire loads, differential functioning

In the main figure, you see the vehicle with all the body movements. Roll, pitch and yaw. But also the individual suspension travel.

It very quickly shows you whether the data make sense, because you have a feel of how it should look like.

Size of contact patches relates to vertical load

Screenshot of the LapSim GUI showing a top view of the animation where tire load and forces are clearly visible

On the top view, you see the tire forces displayed. The area of the contact patch is in direct relation to the vertical load acting on the tire.

The orange arrows show the combined forces. The long lines show you the momentary load distribution over the four tires.

Vehicle drift angle versus front and rear slip angle

Screenshot of the LapSim GUI, showing the dashboard in the animation including vehicle handling state

On the dashboard, the right gauche shows the lateral slip of the two axes as well as the difference between them, defined as vehicle handling state.

In the vehicle animation the vehicle handling state is used shown as the yaw angle of the vehicle.

Helpful visualization of the LSD functioning

In the animation, the differential two appearances. A box, when there is a speed difference. A straight beam when there is no speed difference (representing a spool).

Furthermore an arrow is shown with the LSD force. The colour of the arrow and differential is blue when the differential force pushes the car towards understeer. Orange means the differential force pushes the vehicle in the direction of oversteer.

Screenshot of the LapSim GUI, showing a topview of the vehicle animation while in turn-in of a corner where the LSD differential helps to stabilize the vehicle

Turn in under braking

The first example is at the end of the braking when the vehicle turns into the corner. The differential slides because the ingoing braking torque of the engine is not enough to close the differential.

The LSD stabilizes the car, creating understeer.

Screenshot of the LapSim GUI, showing a top view of the vehicle animation at mid corner, where the LSD differential creates understeer

Mid corner

In mid corner is the first moment where the driver applies the throttle, but he cannot go to feel power.

The LSD still slightly slides and creates understeer.

Screenshot of the LapSim GUI, showing a top view of the vehicle animation at corner exit, where the LSD differential creates oversteer

Exit

Finally the driver can apply (close to) full throttle and the vehicle accelerates out of the corner.

Due to the power input, the LSD closes and creates oversteer.

Just a left mouse click on the track map

Screenshot of the LapSim GUI, showing the driving line, clicking in it selects a point for the animation

There are several ways of selecting a point you wish to see. Use the edit boxes for a time or distance point.

But you can also click in the track graph to select a point. The button "back to " is always updated with the latest selected point.