Some effects of bias errors in redundant flight control systems

Robert F. Stengel

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The controllability and steady-state response of parallel-redundant flight control systems are examined. It is found that state components which appear in the parallel signal paths, e.g., individual actuator-commands, are not controllable, although the sum of the command signals is well behaved. If the response modes associated with these components are not stable, bias errors can cause the components to diverge, leading to the possibility of “nuisance trips” in failure detection/isolation logic and eventual control system lockup (at saturation). Combining the inputs to the control computers assures that sensor bias will not cause divergence, while cross-strapping control strings bounds divergent response to all bias error inputs. Results of numerical solutions confirm the problem and its solutions.

Original languageEnglish (US)
Pages (from-to)150-156
Number of pages7
JournalJournal of Aircraft
Issue number3
StatePublished - Mar 1973

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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