HyperWorks 12.0 Release Notes

Powertrain Model for Use in Vehicle Dynamics
The automotive extensions for MotionSolve now include an equation based powertrain model. This can
be used with all MotionView/MotionSolve vehicle models for various vehicle dynamics and durability
events. The underlying mathematics behind the powertrain is implemented as Control_State_Equation
element (CSE). The equations represent the Internal Combustion Engine (IC Engine) and the clutch
in the powertrain. Figure 3 below shows what the powertrain connects to and the signals it exchanges
with the vehicle systems.
Figure 3: The Powertrain and how it interacts with the vehicle system
The model has the ability to read and interpolate into a 3-D Engine Torque Map to determine the
torque output of an engine based on vehicle states and throttle input. It further models a clutch that
transmits the torque to the gearbox and can be engaged and disengaged by a clutch input signal.
Static Design Factors Improvements
Static Design Factor (SDF) computations for suspensions may now be performed on models with
multiple axles. Earlier releases of MotionSolve could handle only one axle. Now you can calculate the
SDFs for any number of axles.
Tire Free Rolling (Angular) Speed
Calculations for the Free Rolling Omega, have been revised. Now for a tire is computed as:
Where:
• = Rolling Speed of the tire
• = Omega Actual
• = Longitudinal Slip
• = Tire Effective Rolling Radius