Aerospace Instrument-Making Annotation << Back AIRCRAFT TURBOFAN ENGINE LINEAR MODEL ADDITIVE STATIC UNSTRUCTURED AND STRUCTURED UNCERTAINTY NORM ESTIMATION R.L. Leibov, O.S. Gurevich This paper presents aircraft turbofan engine linear model additive static unstructured and structured uncertainties spectral norm estimation using linear and nonlinear model time responses. The results of proposed technique application for closed-loop control system with electronic digital controller of fan speed, compressor speed and turbine outlet total temperature deviations (the minimal output value is selected) and non-inertial main combustion chamber fuel flow actuator are presented. The observer and controller parameters of each of the loops are calculated using the H∞ control theory. Keywords: aircraft turbofan engine, nonlinear and linear model time responses, additive static unstructured and structured uncertainty, electronic digital controller, observer and controller of each of the loops, H∞ control theory. DOI: 10.25791/aviakosmos.1.2023.1315 Pp. 03-18.