Bank of H∞H∞ filters for sensor fault isolation in active controlled flexible structures

• Sensor validation in feedback controlled structures is approached in this work.
• A bank of H∞H∞ filters is applied to sensor fault detection and fault isolation.
• Fault residue measure is quantified by a compound and more robust indicator.
• Techniques are successfully verified experimentally in a controlled plate structure.

In this paper a scheme based on a bank of H∞H∞ filters for sensor validation in closed-loop with the aid of a specialized indicator for quantitative analysis of residues is proposed. The residues are generated by a bank of H∞H∞ estimators. The indicator applied to the residues is the product of three other ones, namely sum of the modulus of the residue, quadratic sum of the residue, modal assurance criterion between measures and estimated outputs. The technique is validated in simulations with a model of an identified aluminum plate structure under active vibration control. Experiments were also performed.