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Bonivento C., Paoli A., Marconi L.
"Direct fault-tolerant control approach for a winding machine"
 
Type Conference
Author(s) Bonivento C., Paoli A., Marconi L.
Title Direct fault-tolerant control approach for a winding machine
Editor 9th Mediterranean Conference on Control and Automation (MED01)
Keywords Fault detection and isolation, Fault tolerant control, Internal model principle, Winding unwinding process, Web tension control.
Abstract

Automated systems are vulnerable to faults such as defects in sensors or in actuators and failures in controllers or in control loop, which can cause undesired reactions and consequences as damage to technical parts of the plant, to personnel or to the environment. For this reason fault tolerant control is an emerging key area in automatic control. The principal aim is to avoid that local faults will develop into failures that can cause safety hazards.

The application of a new fault-tolerant control methodology to a winding machine is here considered. After a brief description of the overall system, a first attempt of this paper is the modelling of the system as a linear time variant system. Then possible faults on actuators and sensors are taken in account and their effect in terms of gain matrices are modelled.

After this preliminary analysis, a simple Fault Detection and Isolation strategy based on direct test on control system is described, which allows perfect isolation of the possible faults proposed. The information provided by the FDI are then used to develop a control reconfiguration structure in order to achieve a fault tolerant control system, able to preserve pre-specified performance also in presence of faulty situation.

The robustness of the algorithm is finally checked with respect to some uncertain parameters of the model in order to investigate how variations of these parameters reflect on the diagnosis and reconfiguration process.

Simulations on the model illustrate the performance of the fault tolerant system for some selected fault scenarios. In order to check the effectiveness of the procedure exposed, a certain number of tests have been made, simulating few faulty or healthy conditions.

Document 7645.Document.pdf (716961 bytes)
Year 2001


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