| A four-machine test bed was installed at SCANIA's Technical
Centre in Södertälje (Sweden) for acquiring data regarding the
fatigue, lifetime and function of truck rear axles. The test bed is used
for developing rear axles, especially for heavy trucks with and without
tandem axles.
For this reason a total of four electrical machines as drive and load
units is required in the test room.
Drive concept
To achieve high availability for test bed operation, Siemens has developed
a drive concept with the following advantages:
- No adaptation gear boxes
- No adjusting devices
- High-accuracy torque measurement
- Low power input
Design features
- Control and monitoring:
PLC SIMATIC S7-300 and ET 200 distributed I/O stations
- Closed-loop control:
Real-time processing system with MATLAB/SIMULINK software and manual
operating mode.
- Computer operation:
Industrial PC-system with automation system CATS NT (operating system
Windows 2000)
- Data acquisition:
For evaluating sensor signals of the test bed and test object:
ET 200M distributed I/O stations and PROFIBUS-FO cable connections to
PLC or CATS NT system.
Conclusion
The test bed is a future-oriented solution for fatigue and endurance
tests as well as for function tests of rear axles for Trucks and busses.
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