Abstract
Aiming at the low accuracy problem of linear model of Valve-controlled motor system in conditions of frequent start-stop and commutation, the nonlinear characteristics of the main components of valve-controlled motor system are analyzed, and non-linear mathematical models and simulation models are established to study the impact on the system of each nonlinear characteristic separately. Hammerstein model consists of a static nonlinear part and dynamic linear part connected in series is adopted, and the non-linear characteristics are introduced to the system. The multi-frequency sinusoidal input signal of test is used as the input of Hammerstein simulation model. And the simulation results are compared with test results and other model output, the results proved that the nonlinear characteristic impacts of the motor valve controlled system really exist, and Hammerstein model can describe nonlinear characteristics of the system accurately.
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