平板断面压力分布对颤振导数及振动形态的影响

发布时间：2018-07-28 12:10

【摘要】：该文通过适当简化推导了采用模型表面波动压力的形式来描述的颤振导数,基于流固松耦合的计算策略,利用现有流体软件的用户自定义(UDF)功能,应用数值方法分析了模型表面波动压力分布特性对颤振导数的影响。从细观层面上阐述了颤振导数对模型振动的影响及其气动耦合现象。该文研究表明颤振导数的气动耦合现象及其对模型颤振产生的不同作用取决于模型表面波动压力的分布特征,这就使得振动模型表面波动压力分布特性成为影响模型颤振的主要因素。在颤振临界状态下,振动模型表面波动压力的主要成分向模型迎风侧漂移,造成振动模型扭转运动的中心前移,与模型的几何扭转中心不再重合,发生了偏移。
[Abstract]:In this paper, the flutter derivative described in the form of wave pressure on the surface of the model is derived by properly simplifying the fluid-solid loosening calculation strategy, and the user-defined (UDF) function of the existing fluid software is utilized. The influence of wave pressure distribution on flutter derivative is analyzed by numerical method. The effect of flutter derivative on the vibration of the model and its aerodynamic coupling are discussed from the meso level. In this paper, it is shown that the aerodynamic coupling of flutter derivatives and their different effects on model flutter depend on the distribution of fluctuating pressure on the surface of the model. This makes the vibration model surface wave pressure distribution characteristics become the main factors that affect the model flutter. In the flutter critical state, the main components of the fluctuating pressure on the surface of the vibration model drift to the windward side of the model, resulting in the forward movement of the center of the torsional motion of the vibration model, which no longer overlaps with the geometric torsional center of the model, and the migration occurs.
【作者单位】：华北水利水电大学土木与交通学院;同济大学桥梁工程系;
【基金】：国家自然科学基金项目(51208197,5102114005) 华北水利水电大学高层次人才资助项目(201315)
【分类号】：U441.3

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