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Slide 1 PowerPoint Slide Shows Here are some links to an automated slide show. View it in total or in parts. You can quit any section by pressing the Escape.

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Presentation on theme: "Slide 1 PowerPoint Slide Shows Here are some links to an automated slide show. View it in total or in parts. You can quit any section by pressing the Escape."— Presentation transcript:

1 slide 1 PowerPoint Slide Shows Here are some links to an automated slide show. View it in total or in parts. You can quit any section by pressing the Escape key 1. The Company Introduction to Mechanical Simulation, the company that provides CarSim 5. CarSim RT CarSim runs much faster than real time on PCs, making it well-suited for real-time testing with hardware in the loop (HIL). 3. CarSim Math Models This presents the thinking behind the modeling of vehicle dynamics and the choices of measurable parameters and properties. 4. Extending CarSim Many CarSim users extend the models and/or controllers using Simulink. 2. Using CarSim This shows the way you use CarSim, choosing data sets, clicking buttons and viewing results. The Whole Show Click here for the full 13-minute PowerPoint show about CarSim. You can escape the show early by pressing the Escape key. CarSim in PowerPoint Sales Information Doug Orrin (734) Ext. 209 Academic Programs Damon A. Becker (734) Ext. 212 International Sales More Information

2 slide 2 The CarSim Show Simulated Vehicle Testing Easy to Use Fast Accurate Extensible Inexpensive Industry Standard CarSim ® Narrated by Michael Sayers, Ph.D. Chief technical officer at Mechanical Simulation

3 slide 3 Mechanical Simulation Background Software company specializing in vehicle dynamics Founded in 1996 Spin-off of UMTRI (Univ. of Mich. Transportation Research Institute) Core Competencies Vehicle dynamics expertise Testing point of view Making software productive Full documentation Extensive real-time support Who We Are

4 slide 4 Our Products CarSim Four-wheeled cars, light trucks, utility vehicles, race cars With or without trailers Real-time versions TruckSim Heavy trucks and combination vehicles Dual tires About Mechanical Simulation BikeSim Motorcycle dynamics For release early 2005

5 slide 5 Our Customers OEMs (Car and Truck) Tier 1 and 2 Suppliers Testing and Research Organizations Universities Who Uses CarSim / TruckSim

6 slide 6 Control strategy and software in the loop Product Development and Validation Subsystem and component definition Vehicle and system definition Production Design Vehicle and system performance When Do You Use CarSim Component testing and hardware in the loop

7 slide 7 Using CarSim The Parts of CarSim Use the database to define vehicles, conditions, and test results View results with animation View engineering plots Export results to other software Vehicle math model solvers Graphical database Surface animator Engineering plotter

8 slide 8 Simulation Graphical User Interface The database is organized with 150 graphic screens Each screen accesses a library of data sets Navigate like a web browser Use pull-down menus to select data sets from libraries Screens show data in context On-line help for all controls Easy to copy existing data sets and make changes Past runs are part of the CarSim database Using CarSim

9 slide 9 The left 1/3 of the screen has inputs for the test run The middle 1/3 has controls for the run The right 1/3 shows results of the run The CarSim Run Screen To make a run: Start with an existing data set for a similar test Maybe change the vehicle Maybe change the driver controls Maybe change the road Click the Run button Using CarSim

10 slide 10 Viewing Animations Maybe change the camera settings Maybe overlay another run Click the Animate button Using CarSim

11 slide 11 Automatic setup Simple user interface OpenGL Highly extensible Shading, lighting, textures, fog, … Automatic surface smoothing Standard Shape Files STL OBJ Animator Using CarSim

12 slide 12 CarSim Math Models

13 slide 13 Main Modeling Objectives Predict vehicle system response to: Driver steering control Driver braking control Driver throttle and shifting control Road friction and 3D geometry Air and wind Tires are very important Need realistic shear forces and moments from the tire model: F x, F y, F z, M x, M y, M z Must calculate realistic input variables for the tire model:,,, R Predict transfer of forces to the sprung mass by the suspension CarSim Math Models

14 slide 14 Inertia Measurement Built on 30 Years of Research at UMTRI Tire Testing Suspension Measurement Modeling, Algorithms, & Simulation Testing and Analysis Parameter Measurement CarSim Validation

15 slide 15 Lateral G System-Level Modeling Ideal model complexity for chassis control development & proving ground correlation. Models are computationally stable Models run real time on PCs All model parameters can be measured CarSim Road Test CarSim Math Models Yaw ratedeg/s

16 slide 16 Parameters Simple Properties Known to be significant Shown on screen in context Dimensions, masses, ratios Measurable No need to be a simulation specialist to understand them CarSim Math Models

17 slide 17 Nonlinear Properties Represented with tables of measurable quantities Obtained from lab Obtained from other software (simulated measurements) CarSim Math Models

18 slide 18 3D Roads Simple tabular descriptions Horizontal, vertical, 3D incremental elevation Tables are independent Data from CAD, spreadsheet, GPS, etc. Mixture of spline and straight-line interpolation Automatically create shapes for surface animator Roads can be open-ended or looped CarSim Math Models

19 slide 19 CarSim Model State Variables 30 multibody states 6 sprung mass DOF 4 suspension jounce / axle roll DOF 4 wheel rotation DOF Engine rotation DOF 14 Auxiliary dynamic states 8 tire dynamic states 4 fluid states 35 extra states ABS control Suspension and steering compliance Wheel lockup Dynamic states are defined by differential equations. X =f Raw Output Simulated test conditions Math Model of System Equation Solver Vehicle Properties CarSim Math Models

20 slide 20 Extend with Simulink Simulink (add-on to MATLAB) is the most used simulation environment Extensibility

21 slide 21 Simulink Support / Interface CarSim math models are available as Simulink S-Function blocks Use Simulink from CarSim Use CarSim from Simulink Extend CarSim with Simulink

22 slide 22 Import from Simulink to CarSim 160+ Imported variables Control inputs Tire/ground inputs Tire forces and moments Spring and damper forces Steering system angles Driveline torques Brake torques & pressures Wind inputs Arbitrary forces & moments Variables can be defined in Simulink Variables can be defined in other software and linked to CarSim with Simulink Imported variables are added to similar variables internal to CarSim Extend CarSim with Simulink

23 slide 23 Exported variables are available for user-defined extensions 560+ exported variables (4-wheeled models) Position and orientation Motion variables Velocities and accelerations Rigid bodies and force components (springs, shocks) Forces and moments of most components Most control variables All ground and wind information Export from CarSim to Simulink Extend CarSim with Simulink

24 slide 24 Real-Time Testing with Hardware In the Loop CarSim is the Loop Hardware Testing

25 slide 25 CarSim RT Host Machine w. Windows Database Animator & Plotter User Interface Target Machine w. RT OS CarSim math models Hardware-in-the-loop interface Works with most RT systems CarSim RT for Hardware in the Loop

26 slide 26 Driving Simulators Marketing Research Training CarSim RT for Hardware in the Loop

27 slide 27 CarSim / CarSim RT Comparison Math models are identical Same equations of motion Same fixed-step integrators Same time steps Same set of importable (input) variables Same compatibility with Simulink Same Database, Animator, Plotter CarSim RT for Hardware in the Loop

28 slide 28 The CarSim Show Review CarSim Easy to Use Fast Accurate Extensible Inexpensive Industry Standard ®


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