Improving the dependability of the servo drives of unmanned aerial vehicles through optimized operating modes

Abstract

Aim. Improving the reliability of servo drives through partial redundancy of structural components. Methods. The paper uses methods of harmonic analysis, technical system dependability theory. Results. The mean times to failure of servo drives that differ in terms of the level of redundancy of structural elements (external connectors, feedback sensors, control boards, electric motors and load gears) were compared. It was shown that structural element redundancy along with the capability to switch to still-operable elements in the course of servo drive operation enable a triple increase of the failure tolerance. The authors suggested criteria for identifying the moment of time for decision-making regarding an electric servo’s structure modification before the moment of failure of the redundant element of such servo. Conclusion. The method suggested in the paper allows formalizing the process of electric servo structure modification for the purpose of ensuring the required level of failure tolerance.