平板斷面壓力分布對顫振導(dǎo)數(shù)及振動形態(tài)的影響
發(fā)布時(shí)間：2018-07-28 12:10
【摘要】：該文通過適當(dāng)簡化推導(dǎo)了采用模型表面波動壓力的形式來描述的顫振導(dǎo)數(shù),基于流固松耦合的計(jì)算策略,利用現(xiàn)有流體軟件的用戶自定義(UDF)功能,應(yīng)用數(shù)值方法分析了模型表面波動壓力分布特性對顫振導(dǎo)數(shù)的影響。從細(xì)觀層面上闡述了顫振導(dǎo)數(shù)對模型振動的影響及其氣動耦合現(xiàn)象。該文研究表明顫振導(dǎo)數(shù)的氣動耦合現(xiàn)象及其對模型顫振產(chǎn)生的不同作用取決于模型表面波動壓力的分布特征,這就使得振動模型表面波動壓力分布特性成為影響模型顫振的主要因素。在顫振臨界狀態(tài)下,振動模型表面波動壓力的主要成分向模型迎風(fēng)側(cè)漂移,造成振動模型扭轉(zhuǎn)運(yùn)動的中心前移,與模型的幾何扭轉(zhuǎn)中心不再重合,發(fā)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.
【作者單位】： 華北水利水電大學(xué)土木與交通學(xué)院;同濟(jì)大學(xué)橋梁工程系;
【基金】：國家自然科學(xué)基金項(xiàng)目(51208197,5102114005) 華北水利水電大學(xué)高層次人才資助項(xiàng)目(201315)
【分類號】：U441.3
[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.
【作者單位】： 華北水利水電大學(xué)土木與交通學(xué)院;同濟(jì)大學(xué)橋梁工程系;
【基金】：國家自然科學(xué)基金項(xiàng)目(51208197,5102114005) 華北水利水電大學(xué)高層次人才資助項(xiàng)目(201315)
【分類號】：U441.3
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