Building the system and setting parameters

Procedure

1. Construct the system as shown in the figure Figure 97.

Note You can get this system through Help > Get demo, from the Tutorials directory. The file is called DriveLine.ame.

2. Click Premier submodel to select the simplest possible submodels.

3. Save the new system as driveline.Set parameters for the submodels, as shown in the following table:

Submodel

Number on sketch if any

Comment

Title

Value

MECRL01

3

Defines inertia of engine and computes response of engine to applied torques.

shaft speed port 2 [rev/min]

2500

moment of inertia [kgm**2]

0.2

Coefficient of viscous friction [Nm/(rev/min)]

0

MECRL01

4

Defines inertia of gearbox and computes response of engine to applied torques.

moment of inertia [kgm**2]

0.001

Coefficient of viscous friction [NM/(rev/min)]

0

RN001

Defines ratio of gearbox and adjusts speed and torque accordingly.

gear ratio

3.0

UD00

1

Defines engine torque in Nm

number of stages

3

duration of stage 1 [s]

0.1

output at end of stage 2

200

duration of stage 2 [s]

2

output at start of stage 3

200

output at end of stage 3

200

SIGUDA01

2

Defines the operation of the clutch. 1=fully engaged, 0=fully disengaged.

name of ASCII file

Expand the table entry to locate the clutch.data file:

MECFR2R0A

The clutch.

maximum Coulomb (dynamic) friction torque [Nm]

400

RSD00

Compliance of driveline.

stiffness [Nm/degree]

200

damper rating [Nm/(rev/min)]

1

CONS0

Define the overall transformer ratio between the drive shaft and the body.

Constant value

0.1

MECMAS21

Defines the linear inertia characteristics of the complete car.

endstop type

none

mass [kg]

1000

inclination (+90 port 1 lowest, -90 port 1 highest) [degree]

-10

These parameters imply that:

The car is initially at rest but on a 10 degree slope.

The engine speed is initially 2500 rev/min and there is a constant torque of 200 Nm.

The clutch is disengaged for 0.1s and then is ramped to fully engaged in a further 0.25 s.