Design new perfect car

How it will behave?

Is the suspension OK?

Design its geometry and parameters. Then, you can design several simulation experiments. First, the car will fall from above the road. You will be able to observe how the suspension reacts and how it stabilizes over the road. Two more experiments are inserted automatically: the initial acceleration and the final breaking.

  You can add ten more simulation experiments in one program run. They consist in the given road shape, which can be edited. Edit the ramp, vibrator or any other obstacle (road shape) for the right and left side of the road. The experiments can also include a curve. Then, the simulation follows. The car is placed (falls) on the road, then accelerates to a given maximal velocity, goes through the obstacles you have edited and finally stops. The simulation is shown as an animated 3D car and road image. On a fast machine (PC, about 2GHz), the movement is nearly as in the real time. Anyway, the current model time is indicated on the screen, so you can assess the real time model behavior.

The main purpose of the simulation is to analyze the car and suspension movement, to visualize the dynamic behavior over given obstacles and curves and to see the corresponding parameters plotted as functions of time. This is a basic simulation where only the independent suspension system is considered. No sophisticated special features like hydrolastic, hudrogas or hydropneumatic suspension are supported. Note that we can provide modeling tools for such systems as customized simulations.
Below you can see an example of the plot of the forces produced on the tyres of the two front wheels. First, the car passes through a vibrator and then it jumps over a slightly asymmetric ramp.

The forces can also bee seen on-line during the simulation. In this case only the wheels are shown, and the forces appear as moving 3D arrows, as shown below.


  The shape of the car is user-defined. The CarDyns program accepts the STL ASCII files to display the car body. So, you can edit the car shape using any CAD/CAM tool that can export the STL files, or get the file from any other source. The above images have been generated using a default STL file, provided with the package.

The simulation was coded in the PSM++ simulation language, using the pre-defined PSM++ rigid body process.

Platform: PC, Windows 2000, XP, NT.

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DEMO : (zip file, about 0.8 MB). The main program is cardyndef.exe.

download the demo.

Stanislaw Raczynski
P.O.Box 22-783

14000 Mexico D.F.Mexico

Recommended links:

PSM++ simulation language (new version of PASION)

NEW! Bluesss : Simulation in C++

QMS - Queuing Model Simulator

FLUIDS5 - Fluid dynamics


Click here to buy the package. The price is US $ 69

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