Title: The use of Simulink and SimMechanics in the development of vehicle test systems
1The use of Simulink and SimMechanics in the
development of vehicle test systems
Andrew Plummer Instron Ltd, UK andrew_plummer_at_ins
tron.com
2Materials component testing machines
3Overview
- Hydraulic catapult for vehicle crash testing
- Control using an inverse dynamic model
- Full vehicle test rigs for road/track simulation
- Modelling for performance verification
- Real-time models for control
4Crash testing catapult
5(No Transcript)
6Modelling system dynamicsForward model
7Calculating command signal
8Calculating command signal
Target acceleration
Valve command signal
Inverse Dynamic Model
9Results
10Full vehicle test rigs
11F1 track simulationTo minimise lap time by
assessing alternative designs and set-ups.
12Test rig control concept
Car and rig Up to 28 hydraulic actuators
Control System
Valve drives
Standard digital controller (8800)
- Specialised control functions
- via Simulink Real-Time Code
Sensors
Virtual systems, e.g. aero model
13Performance simulation - Simulink and
SimMechanics
Car and rig
Control System
Hydraulic system SIMULINK MODEL
Valve drives
Standard digital controller SIMULINK MODEL
Rig mechanics SimMECHANICS MODEL
- Specialised control functions
- SIMULINK MODEL
Sensors
Car mechanics SimMECHANICS MODEL
Virtual systems, e.g. aero model
14Results
Control performance
Kinematics - e.g. joint angles
Forces (joints, actuators etc.)
15Benefits of simulation
- Obtaining mechanical design information
- loads, displacements (clashes)
- System performance prediction
- comparison with specification
- perform virtual acceptance tests
- assess and refine controller, hydraulic and
mechanical design - Avoid expensive re-work !!
16Advantages of Simulink for rig simulation
- Control system and mechanical multi-body
simulation in a unified environment - Increased simulation speed
- Some parts of control system already designed
using Simulink ready for code-generation