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Nonlinear vibration of spinning joined conical-cylindrical shells with bolt boundary constraints in thermal environment
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Nonlinear vibration of spinning joined conical-cylindrical shells with bolt boundary constraints in thermal environment
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Journal Article
Nonlinear vibration of spinning joined conical-cylindrical shells with bolt boundary constraints in thermal environment
2024
Overview
Spinning joined conical-cylindrical shells (JCCSs) with bolt boundary constraints are widely used in rotor systems of aero-engines, and always operate in thermal environments. Under external excitation, the friction hysteresis phenomenon of bolt connections often occurs, and the high-temperature environment further changes the friction characteristics of the connection interface, making the vibration characteristics of the system nonlinear and complex. Till now, research on the nonlinear vibration of spinning JCCSs caused by bolt connections with the temperature effect is scarce. To address this problem, this study develops a nonlinear dynamic model of spinning JCCSs with bolt boundary constraints in a thermal environment for the first time. A novel equivalent mechanical model of the bolt connection is established, which is represented by the nonlinear stiffness and damping with amplitude and temperature-dependent characteristics. The energy expressions of spinning conical and cylindrical shell components are deduced by Donnell’s shell theory. The rigid joint between the conical and cylindrical shells is realized via successive distributed artificial springs. The Chebyshev polynomials are adopted as the admissible functions, and the governing equation is obtained by the Lagrange equation. Then, by comparison with the available literature, finite element simulation, and experiment test, the accuracy of the established theoretical model is validated. The nonlinear vibration mechanism is illustrated from aspects of equivalent stiffness and equivalent damping. Finally, the effects of spinning speed and temperature on nonlinear vibrations of bolted JCCSs are further investigated.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
