Dynamic Characteristics of Horizontal Rotor–Stator Nonlinear Interaction Under Additional Acceleration

Rotor–stator nonlinear interactions are commonly observed in rotating machines due to the need for reduced rotor–stator clearance, which is essential for achieving high efficiency. Additionally, the effects of acceleration resulting from aircraft maneuvering are not considered in the current rotor–stator interaction model. This study establishes a rotor–stator rubbing model that incorporates additional acceleration. An event function is utilized to detect contact and noncontact states. Responses ranging from low to high rotating speeds are analyzed through bifurcation diagrams and full-spectrum methods to illustrate the complex dynamic characteristics. Orbits, fast Fourier transform spectra, and Lyapunov exponents are plotted to demonstrate the nonlinear behaviors at specific speeds and accelerations. The results indicate that regions of chaotic motion expand, while areas of internal resonance decrease at low nondimensional gravity coefficients. Conversely, at high nondimensional gravity coefficients, the chaotic regions diminish, and multiple periodic motions emerge.