本文關(guān)鍵詞：晃蕩機理及荷載特性的實驗研究　出處：《大連理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 晃蕩 模型實驗 相似關(guān)系 局部沖擊 整體荷載

【摘要】：針對海洋工程和航空航天領(lǐng)域,晃蕩問題的研究主要集中以下三個方面：模型實驗研究、晃蕩局部沖擊以及晃蕩整體荷載。本文針對以上三個問題進行了系統(tǒng)的綜述,并分別針對自由液面的相似關(guān)系、低載液率下的局部沖擊和大幅晃蕩下的整體荷載開展實驗研究。論文主要工作和研究結(jié)論歸納如下。(1)自由液面的相似關(guān)系研究采用弗勞德相似準(zhǔn)則設(shè)計了三個不同比尺的GTT八邊形二維液艙,分析了在20%載液率和橫蕩單次沖擊激勵下的模型實驗結(jié)果。討論了在液體沖擊側(cè)壁過程中,波高時程出現(xiàn)雙峰現(xiàn)象,并對不同比尺的液艙中該雙峰現(xiàn)象的差異進行解釋；另外對不同尺寸液艙中的流場進行分析,得出模型液艙中波高的相似關(guān)系與液艙比尺有關(guān),液艙尺寸較大時,波高幅值近似符合弗勞德相似關(guān)系,而液艙尺寸較小時,由于粘性力的影響,根據(jù)弗勞德相似還原到原型的結(jié)果偏��；最后分析了波高回落時間與弗勞德相似準(zhǔn)則的關(guān)系。上述研究可以為模型實驗的設(shè)計提供有益的參考。(2)低載液率下的晃蕩局部沖擊研究針對低載液率下的液體晃蕩沖擊機理和荷載分布規(guī)律,本文開展了載液率h/H=0.125,橫蕩簡諧激勵下的晃蕩沖擊實驗,實驗頻率包含由理論推導(dǎo)的最低三階固有頻率。通過對波高和高速視頻數(shù)據(jù)的分析,對多種典型的低載液率下的自由液面波形進行了分析；另外結(jié)合不同頻率下的沖擊壓力分布,得出最劇烈的液體晃蕩出現(xiàn)在一階頻率附近,其中最大波高出現(xiàn)在σ/σ1*=1.13附近,而最大沖擊壓力出現(xiàn)在σ/σ1*=1.2附近。而當(dāng)無量綱激勵頻率σ/σ1*1.41以后,晃蕩沖擊次數(shù)急劇減少；此外對沖擊壓力在側(cè)壁的空間分布進行了分析,得出在一階固有頻率附近最大沖擊壓力發(fā)生在自由液面附近,側(cè)壁沖擊位置隨激勵頻率增加而升高,并且該沖擊位置對激勵頻率敏感。(3)大幅晃蕩的整體荷載研究針對飛行器燃料艙的晃蕩問題開展了不同載液率,不同激勵頻率和不同激勵幅值下模型實驗研究,并結(jié)合高速視頻對橢球罐液艙的晃蕩物理現(xiàn)象進行分析。通過將實驗數(shù)據(jù)與數(shù)值仿真和等效力學(xué)模型進行對比,討論了數(shù)值仿真和等效力學(xué)模型的局限性。另外結(jié)合物理現(xiàn)象分析了晃蕩整體力的分布規(guī)律。該工作可以為優(yōu)化等效力學(xué)模型和晃蕩整體力的實驗設(shè)計提供參考。
[Abstract]:In the field of marine engineering and aerospace research, sloshing problems mainly focus on the following three aspects: Experimental Study on sloshing model, local impact and overall load. In this paper the sloshing on the summary of the above three problems, which were aimed at the free surface similarity relation, experimental study on the overall load of low loading rate under local liquid the impact and the large amplitude sloshing under. The main work and research conclusions of the thesis are summarized as follows. (1) research on the similar relationship of similarity criterion of designing three different scale GTT eight edge shaped two-dimensional tank using Froude free surface, analyzes the swing single impact model test results under the excitation at 20% load ratio of liquid and cross in the process are discussed. The impact of liquid in the side wall, wave high Cheng Shuangfeng phenomenon, interpretation and the phenomenon of Shuangfeng tanks of different scales in difference; in addition to the different size in a liquid tank The flow field analysis, the relationship with the tank scale similar wave model in a liquid tank, the tank size is larger, the amplitude of wave height is approximately similar to Froude, while the tank size is small, the influence of viscous force, according to the results of the prototype is similar to Froude to restore too small; the final analysis of the height of fall the time relationship with Froude. The similarity criteria provide a useful reference for the design of can model experiment. (2) the low load rate of the liquid sloshing impact on local low load rate of the liquid sloshing impact mechanism and load distribution, this paper carried out the liquid carrying rate of h/H=0.125, yaw sloshing impact experiment of a simple under excitation of the experimental frequency contains from a minimum of three order natural frequency theory. Based on the analysis of wave height and high speed video data, a variety of typical low load rate of the liquid free surface wave was In combination with different frequency analysis; the impact of pressure distribution, the most violent liquid sloshing appears near the natural frequency, the maximum wave height in sigma sigma / near 1*=1.13, while the maximum impact pressure in sigma sigma / near 1*=1.2. And when the dimensionless frequency / sigma Sigma 1*1.41, sloshing impact times sharply in addition to the impact of reduced; pressure distribution in the side wall of the space are analyzed, obtained in the vicinity of the first-order natural frequency of the maximum impact pressure occurs near the free surface and the side wall of the impact location increases with increasing the excitation frequency, and the impact of position sensitive to excitation frequency. (3) the overall load of large amplitude sloshing sloshing problems for aircraft fuel tanks are carried out under different liquid ratio, model experiment on different excitation frequencies and different excitation amplitude, combined with the physical phenomenon of high speed video sloshing tank tank of ellipsoid According to the analysis of the experimental data and numerical simulation and equivalent mechanical model are compared, the limitations of numerical simulation and equivalent mechanical model is discussed. Combining the distribution of physical phenomena of sloshing force. Provide reference for overall design of the experimental work can be optimized for the equivalent mechanical model and whole sloshing force.

【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U663.85

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本文編號：1412710