【摘要】 在旋转输流管道工作过程中，热-流-固多物理场耦合效应易诱发复杂的振动行为，导致系统动力失稳，对结构安全性构成显著威胁。为此，该研究聚焦非线性应力-温度条件下旋转输流管道的振动和稳定性问题。首先，基于哈密顿原理和热弹性理论，建立热载荷作用下旋转输流管道的横向振动控制方程；然后，采用伽辽金法对管道系统的偏微分控制方程进行离散化处理，并求解系统的复特征频率；最后，深入研究管道系统的动力学特性，详细探究转速、质量比、流速、涡动比及热载荷等关键参数对系统振动特性和稳定性的影响规律。结果表明，流-固耦合作用、涡动比和温度效应对管道系统的稳定性影响显著，而转速主要影响系统的固有频率。温度变化量和涡动比的增大会显著降低系统的临界失稳阈值，而质量比对管道稳定性的影响很小。此外，温度载荷以及涡动比的变化会对系统的复模态运动产生一定影响。更多还原

【Abstract】 During the operation of spinning pipes conveying fluid, coupled thermal-fluid-solid multiphysics effects can induce complex vibration behaviors, leading to dynamic instability and posing significant threats to structural safety. This study therefore focuses on the vibration and stability issues of spinning pipes conveying fluid under nonlinear stress-temperature conditions. First, based on Hamilton’s principle and thermoelastic theory, the lateral vibration control equations for spinning pipes conveying fluid under thermal loading were established. Subsequently, the partial differential control equations of the pipe system were discretized using the Galerkin method, and the complex natural frequencies of the system were solved. Finally, the dynamics of the pipe system were thoroughly investigated, examining the influence of key parameters—spinning speed, mass ratio, flow velocity, vortex-induced vibration ratio, and thermal load—on the system’s vibration characteristics and stability. Results indicate that fluid-structure interaction, vortex-induced vibration ratio, and temperature effects significantly impact system stability, while spinning speed primarily affects the system’s natural frequency. Increases in temperature variation and vortex-induced vibration ratio substantially lower the system’s critical instability threshold, while mass ratio exerts minimal influence on pipeline stability. Additionally, variations in thermal loading and vortex-induced vibration ratio exert certain effects on the system’s complex modal motion.更多还原