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首页> 外文期刊>International journal of non-linear mechanics >Routes to Synchronization in a pitch-plunge aeroelastic system with coupled structural and aerodynamic nonlinearities
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Routes to Synchronization in a pitch-plunge aeroelastic system with coupled structural and aerodynamic nonlinearities

机译：具有耦合结构和空气动力学非线性的俯冲空气弹性系统同步的路线

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摘要

The present study aims to investigate the synchronization characteristics of a pitch & ndash;plunge aeroelastic system subjected to coupled structural free-play and dynamic stall-induced aerodynamic nonlinearities. The semi empirical Leishman & ndash;Beddoes (LB) aerodynamic model is used to capture the dynamic stall phenomena at large angles-of-attack (AoA). A bifurcation analysis, considering the flow-speed as the control parameter, reveals that the free-play nonlinearity is primarily responsible for the dynamical transition in the presence of the attached flow. In this case, a pitch and plunge frequency coalescence takes place through an aperiodic to periodic signature transition. Furthermore, by tracking the flow specific variables estimated using the LB model, it is observed that the onset of the dynamic stall plays a pivotal role in the bifurcation scenario at high flow speed regimes, marking the presence of stall flutter. The framework of synchronization is used to discern the response dynamics at low speed and high speed flow regime by estimating the pitch and plunge modal frequencies and their corresponding phase components. The routes to synchronization are identified to be through phase locking (frequency coalescence) and through suppression of the plunge mode by the dominance of pitching frequency in the regimes before and after the onset of dynamic stall, respectively. Finally, it is shown that the different synchronization routes can possibly be a useful tool to identify the presence of stall flutter oscillations in a coupled aeroelastic system.
机译：本研究旨在研究沥青＆ndash的同步特性;暴跌的空气弹性系统经受耦合结构自由游戏和动态失速诱导的空气动力学非线性。半经验利什曼＆ndash;床头交通（LB）空气动力学模型用于捕获大角度（AOA）的动态失速现象。将流量速度视为控制参数的分叉分析表明，自由播放非线性主要负责在附加流情况下的动态转变。在这种情况下，通过非周期性到周期性签名转变来进行间距和插入频率聚焦。此外，通过跟踪使用LB模型估计的流动特定变量，观察到动态失速的开始在高流量速度制度下在分叉场景中发挥枢轴作用，标记失速颤动的存在。同步框架通过估计间距和平面模态频率及其对应的相位分量来识别低速和高速流动状态下的响应动态。将与同步的路线识别为通过阶段锁定（频率聚结），并且通过分别在动态失速前后的制度中的俯仰频率的主导地位抑制了平面模式。最后，示出了不同的同步路线可能是一个有用的工具，以识别在耦合的空气弹性系统中的停滞颤动振荡的存在。

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