1. INSTRUMENTING THE MODEL
SECTION 9
INSTRUMENTING THE MODEL

2. INSTRUMENTING THE MODEL
What does this section contain?
Instrumentation Subsystems
Two-part Body Construction Option
Swept Steer Full-Vehicle Event

3. INSTRUMENTATION SUBSYSTEM
The instrumentation subsystem is an optional subsystem available for full-vehicle models. This subsystem contains various tools used in virtual-to-physical model correlation studies.
The types of instrumentation are:
Ride height sensors
Return the distance between location and ground plane.
You specify the part ID and XYZ coordinate of location.

4. INSTRUMENTATION SUBSYSTEMS (CONT.)
Ride height sensors (cont.)
Request returns the distance between the height sensor and the ground in the ground's reference frame (shortest distance).
Request returns the distance between the height sensor and the ground in the height sensor's reference frame (distance as laser-based sensor would read).

5. INSTRUMENTATION SUBSYSTEMS (CONT.)
The types of instrumentation are (Cont.):
Stringpots
Transducers that measure the displacement between two positions in your vehicle system.
You specify the part ID and XYZ coordinate of the two ends of the stringpot.
Wheel deflection stringpots are unique; they are activated by using a specific name (for example, lf_wheel_deflection).

6. INSTRUMENTATION SUBSYSTEMS (CONT.)
The types of instrumentation are (Cont.):
Velocity sensors
Measure lateral and longitudinal velocity of the vehicle through Q-head transducers.
You specify front and rear XYZ sensor placement.
They are used to correlate sideslip measurements.
Acceleration sensors
Acceleration sensors measure body lateral and longitudinal acceleration.
You specify the part ID and XYZ coordinate of the sensor.
Subsystem construction option sets which calculation method is used.
Corrected - Acceleration in body reference frame.
Uncorrected - Acceleration as accelerometer would measure. Contains additional component roughly equal to sin(pitch or roll angle)*gravity

7. TWO-PART BODY CONSTRUCTION OPTION
Enhances the model by allowing compliance between the front and rear suspension subsystems.
Found in the body subsystem.
The two flexibility models available are:
Torsion - One DOF about X-axis between front and rear body parts; revolute joint connects two halves.
Torsion and Bending - Two DOF about X and Z axes; universal joint connects two halves.
Torsion, Lateral and Vertical Bending - Three DOF about X, Y and Z axes

8. TWO-PART BODY CONSTRUCTION OPTION (CONT.)
You specify the torsional and optional bending stiffness for the linear bushing placed at the connector. The joint and bushing are placed at the original body CG location.

9. TWO-PART BODY CONSTRUCTION OPTION (CONT.)
Each body part has half of the original body mass. The mass and inertia properties are automatically determined so that the aggregate properties of the two halves are exactly the same as the rigid body part specification.

10. SWEPT STEER FULL-VEHICLE EVENT
A swept steer full-vehicle event tests a vehicle's directional control response characteristics under quasi-steady state- turning conditions. In this way, it is very similar to a constant- velocity cornering event.
You specify:
Vehicle speed
Final lateral acceleration
Left or right turn direction
Steering wheel input is applied at a slow enough rate so that no transient effects of response lag are evident.

11. SWEPT STEER FULL-VEHICLE EVENT (CONT.)
Steering wheel input is applied at a slow enough rate so that no transient effects of response lag are evident.