Aerospace Instrument-Making Annotation << Back ACTUATOR FAILURES DETECTION AND CONCRETE DEFINITION USING CLOSED-LOOP CONTROL SYSTEM PIECEWISE LINEAR MODEL R.L. Leibov This paper presents a nonlinear plant piecewise linear model formation technique and actuator failures detection and concrete definition technique using closed-loop control system piecewise linear model. The matrices of static and dynamic linear models are estimated using nonlinear model control variable, state variable and first derivative state variable time responses. The dynamic linear model matrix estimation uses nonlinear programming with additional constraints providing different, real and negative eigenvalues. The results of proposed piecewise-linear model formation technique application for aircraft turbofan engine and actuator failures detection and concrete definition technique application for nozzle throat area actuator failure are presented. Key words: piecewise linear model, aircraft turbofan engine, nozzle throat area, closed-loop control system, actuator failures, hypothesis testing, Kalman filters, discrete optimal linear controllers. Contacts: E-mail: r-leibov@mtu-net.ru Pp. 45-63.