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Systems Realization Laboratory How Does A Car Work? Chris Paredis G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology.

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Presentation on theme: "Systems Realization Laboratory How Does A Car Work? Chris Paredis G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology."— Presentation transcript:

1 Systems Realization Laboratory How Does A Car Work? Chris Paredis G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology

2 Systems Realization Laboratory Learn More about Cars The graphical material in this lecture is copied from You can find much additional information at this web-site

3 Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

4 Systems Realization Laboratory Engine

5 Systems Realization Laboratory Four Cycles IntakeCompressionCombustionExhaust

6 Systems Realization Laboratory Simplified Engine Model Use SI units! Torque in [Nm], velocity in [rad/s] and Power in [W]

7 Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

8 Systems Realization Laboratory Torque Converter

9 Systems Realization Laboratory Torque Converter The model of a torque converter is fairly complex and highly nonlinear We will not consider it in this class. If you need it, it will be provided to you as a Matlab function.

10 Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

11 Systems Realization Laboratory Transmission Purpose: provide large power at all vehicle velocities

12 Systems Realization Laboratory Transmission more compact sun planet ring

13 Systems Realization Laboratory Model of a Transmission Assumptions: No friction or other losses No inertia Reduces the rotational velocity: Increases the torque where n is the transmission ratio and subscript in refers to the shaft connected to the torque converter.

14 Systems Realization Laboratory Car Sub-Systems of Interest Torque Converter Engine Transmission Differential Tires Car Body

15 Systems Realization Laboratory Differential

16 Systems Realization Laboratory Model of a Differential – Same as Transmission Assumptions: Car drives in a straight line No friction or other losses; no inertia Reduces the rotational velocity: Increases the torque where n is the transmission ratio and subscript in refers to the shaft connected to the transmission.

17 Systems Realization Laboratory Model of a Wheel Assumptions: Car drives in a straight line No slip; no tire deformation; no friction losses; no inertia Converts rotational velocity into translational velocity: Converts torque into force: where R is the radius of the wheel.

18 Systems Realization Laboratory Model of the Car Body Wind Resistance: Gravitational Force: Tire Resistance:

19 Systems Realization Laboratory Putting It All Together

20 Systems Realization Laboratory Examples of Other Models in Vehicle Design Computational Fluid Dynamics Noise, Vibration, and Harshness Crash TestingThermal Stress Analysis


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