本文選題：液固耦合振動(dòng)　切入點(diǎn)：充液貯箱　出處：《振動(dòng)與沖擊》2016年04期

【摘要】：對(duì)于液體運(yùn)載火箭縱向振動(dòng)的穩(wěn)定性分析,在建立貯箱內(nèi)液體的振動(dòng)模型時(shí),不僅需要考慮結(jié)構(gòu)的彈性特性,還需要考慮液體晃動(dòng)時(shí)的阻尼特性。由于模態(tài)阻尼比與一個(gè)振動(dòng)周期內(nèi)阻尼力做功、平均機(jī)械能及模態(tài)固有頻率相關(guān)。因此可以先通過(guò)結(jié)構(gòu)與液體的耦合振動(dòng)分析確定其模態(tài),進(jìn)而分別計(jì)算液體與結(jié)構(gòu)接觸面、自由面以及液體內(nèi)部阻尼力做功,同時(shí)計(jì)算平均機(jī)械能,從而得到模態(tài)阻尼比。在計(jì)算模態(tài)阻尼比時(shí),對(duì)耦合振動(dòng)的模態(tài)分析、液體內(nèi)部流場(chǎng)計(jì)算均采用等效比擬的方法,為充分利用通用程序計(jì)算創(chuàng)造了條件。此方法不僅能夠提高效率,同時(shí)也便于工程上的應(yīng)用。
[Abstract]:For the stability analysis of the longitudinal vibration of liquid launch vehicle, not only the elastic characteristics of the structure should be taken into account in establishing the vibration model of liquid in the tank, It is also necessary to consider the damping characteristics of liquid sloshing. Since the modal damping ratio is related to the work done by damping force in a vibration cycle, the average mechanical energy and the natural frequency of the mode can be determined by the coupled vibration analysis of the structure and the liquid. Then the work on the interface between the liquid and the structure, the free surface and the internal damping force of the liquid are calculated respectively, and the average mechanical energy is calculated at the same time, thus the modal damping ratio is obtained. When the modal damping ratio is calculated, the modal analysis of the coupling vibration is made. The equivalent analogy method is used in the calculation of fluid flow field, which creates conditions for making full use of the general program calculation. This method can not only improve the efficiency, but also be convenient for engineering application.
【作者單位】： 復(fù)旦大學(xué)力學(xué)與工程科學(xué)系;
【基金】：國(guó)家自然科學(xué)基金(11202052)
【分類(lèi)號(hào)】：V434

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