Adaptive Detection of Sensor Uncertainties and Failures

作者：Burkholder Jason O^*; Tao Gang

来源：Journal of Guidance, Control, and Dynamics, 2011, 34(6): 1605-1612.

DOI：10.2514/1.50285

This paper presents recent new results on adaptive detection of sensor uncertainty and failures in the control systems of plants having unknown parameters. The broad problem of model-based fault detection and isolation has been widely studied in recent years. Fundamentally, the objective of all model-based diagnostic approaches is to quickly and reliably diagnose subtle incipient or abrupt system degradation by monitoring residuals constructed by comparing the measured system output to a predicted output synthesized using a model of the expected healthy system behavior. Model-based diagnostic and prognostic techniques depend upon mathematical models of the plant. In the presence of uncertainties, modeling errors can decrease system sensitivity to faults, increase the rate of occurrence of false alarms, and reduce the accuracy of failure prognoses. Working in the general direction of improved diagnostic methods for uncertain linear multi-input/multi-output systems (which remain largely unaddressed), this paper presents a new design for adaptive diagnosis of sensor uncertainties and failures, which can be catastrophic in flight control and propulsion control systems. The new methodology explicitly includes parametric representations of additive faults (sensor bias uncertainty) and multiplicative faults (sensor scaling) and considers the special case of total sensor failure (which can result in a time-varying signal that is not influenced by the true value of the system state). Moreover, the design can support diagnosis of arbitrary combinations of sensor faults. Two new adaptive schemes are presented: one for detecting sensor uncertainties and one for detecting sensor failures. Their design and analysis details are given in this paper. For the sensor uncertainty detection scheme, simulation results are presented for an electrohydrostatic actuator, which has a set of sensors used for control. The simulation results verify the desired adaptive system fault-detection properties.

• 出版日期2011-12