Investigation on dynamic behaviors of rotor system with looseness and nonlinear supporting. (1st March 2022)

• Record Type: Journal Article
• Authors: Zhang, Haopeng; Lu, Kuan; Zhang, Wei; Fu, Chao
• Is Part Of: Mechanical systems and signal processing. Volume 166(2022)
• Publication Date: 2022-03-01
• Subjects: Dynamic behaviors -- Rotor system -- Looseness fault -- Geometric nonlinearity; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2021.108400
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: Pedestal looseness and supporting stiffness nonlinearities usually occur in rotating machines. To enhance the robustness and accurately forecast the nonlinear behaviors of rotor systems, these two kinds of common nonlinearities should be considered so that to meet the requirements of the dynamical design of a multi-disk rotor system. In this paper, the rotor system model with cubic supporting stiffness and looseness fault is established by the Lagrange method. The harmonic balance (HB) and Runge–Kutta (RK) methods are used to solve the dynamic response of the double disk rotor system, and the accuracy of the HB method is justified in comparison to the RK method. The bifurcation diagram, time history, frequency spectrum, phase portrait and Poincaré map are provided to discuss the individual and coupling effects of these two nonlinearities on the transient and steady-state response. The obtained experimental results indicate that the proposed model can capture the main nonlinear behaviors of looseness fault and nonlinear supporting stiffness, verifying the accuracy of theoretical and numerical results. Highlights: A rotor system model with looseness and supporting stiffness nonlinearities is established. The nonlinear dynamic behaviors of looseness and nonlinear stiffness are analyzed. The experiment results are used to verify the theoretical and numerical results.