Dr. Mike Sayers to Host CarSim 7 Web Seminar Tomorrow

Please join us for a web seminar which will be hosted by Dr. Mike Sayers titled "CarSim 7 ". Mike is one of the founders of Mechanical Simulation and heads all technical work conducted by Mechanical Simulation Corporation, including software development, documentation and creation of promotional and marketing information.

This seminar will be held on Wednesday, March 28, at 10:00 AM Eastern Daylight Time. It is designed to give both current and future users of CarSim 7 a more in-depth look at the additional features of this powerful new software product. For more information or to enroll in the seminar please go to our website.

 

 

CarSim 7 Applications

The roll out of CarSim 7 marks the introduction of the most powerful vehicle dynamics application on the market to date. We'd like to share some of the developments in CarSim 7 to aid you in doing your job more quickly and accurately.

Adding Outriggers to a Fishhook Rollover Simulation

Problem: Experimental testing of SUVs in the NHTSA Fishhook maneuver is dangerous because of the potential for rollover. To prevent the rollover, outriggers are commonly installed on the vehicle and “tuned” to catch it at the onset of wheel lift-off. The dynamics accompanying such an event can be rather unpredictable, warranting some prove-out of the hardware and test method prior to actual testing. Simulation offers a means to do this, by identifying the test conditions where rollover is likely, as well as providing quantitative measures of the dynamics to be expected.

Solution: With any software program there are always occasions when the user would like to add a new capability to the model, such as the action of outriggers in preventing a rollover. To meet such needs CarSim 7 includes a very powerful run-time programming capability called the VS Command language. The language allows users to write their own code into the solver by which to define new variables, import and export variables, perform basic math functions (including branching) or even adding new differential equations to the solver. VS Commands make it very easy for the user to modify the simulation model to include outriggers.

How It’s Done: The figure shows the animation from a simulated Fishhook test of an SUV with outriggers. The outriggers are simulated by defining Reference Points linked to the sprung mass at the end points of the outriggers and adding appropriate graphical shapes to the vehicle image. VS equations are added to the solver code (just 10 lines of code on the Models: Self-contained Solver screen) to track the height of these points relative to the road. When the outrigger touches down, the VS code calculates vertical forces at these points based on an outrigger stiffness specified by the user. With this simulation the user can observe how the vehicle will behave when the outriggers touch down, find dynamic parameters such as the forces on the outriggers, and “tune” the outrigger design (the height and length) to minimize risk in the test. Readers can download an animation of this test from our website.. Current users of CarSim will find this example in their new release of CS7.

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