本文選題：水彈性響應(yīng) + 組合超大型浮體結(jié)構(gòu)��； 參考：《石家莊鐵道大學(xué)》2014年碩士論文

【摘要】：為了構(gòu)建穩(wěn)固可靠的超大型海洋操作平臺，深入研究浮體結(jié)構(gòu)的水動力響應(yīng)問題就顯得尤為重要。由于箱型超大型浮體結(jié)構(gòu)水平尺寸遠(yuǎn)大于其高度尺寸，是典型的扁平結(jié)構(gòu)，這樣浮體結(jié)構(gòu)的豎向剛度相對較小，就有必要考慮其彈性變形。由于尺寸巨大及實(shí)驗(yàn)各個方面的限制，使得試驗(yàn)研究的難度很大，所以理論研究超大型浮體結(jié)構(gòu)的水彈性響應(yīng)特性具有實(shí)際意義。 由于浮體尺寸很大，為了運(yùn)輸、安全等各個方面的方便快捷，都要求浮體設(shè)計實(shí)現(xiàn)模塊化，并通過一定的連接方式(本文以具有不同扭轉(zhuǎn)剛度的鉸連接來模擬)就能快速完成組裝。為了滿足實(shí)際工程設(shè)計的需要，連接設(shè)計的合理性需要滿足水動力響應(yīng)最基本的要求。同時浮體結(jié)構(gòu)在實(shí)際工程中會受到浮體上外載荷的影響，所以在超大型浮體結(jié)構(gòu)的設(shè)計和建造過程中，研究浮體結(jié)構(gòu)在外載荷作用下的動響應(yīng)問題具有十分重要的意義。文中以通過鉸連接的兩個箱式浮體結(jié)構(gòu)物組合模型為例，研究了組合超大型浮體結(jié)構(gòu)在不同周期外荷載作用下各項(xiàng)參數(shù)以及其連接剛度對其水彈性響應(yīng)的影響規(guī)律。 本文具體研究工作如下： 首先根據(jù)相應(yīng)的理論知識，建立了簡化的組合超大型浮體結(jié)構(gòu)的簡化計算模型。同時根據(jù)線彈性理論及Mindlin厚板動力學(xué)理論，建立了組合式超大型浮體結(jié)構(gòu)的控制方程和混合邊界條件，，并對有關(guān)的物理量和相應(yīng)的表達(dá)式進(jìn)行無量綱化。采用Wiener-Hopf方法，傅里葉變換，劉維爾定理，留數(shù)定理等理論，推導(dǎo)出關(guān)于中間廣義函數(shù)的無窮代數(shù)方程組。最終通過求解無窮代數(shù)方程組，進(jìn)一步得到在外荷載作用下浮板內(nèi)動撓度和動彎矩幅值的分布。 其次，可根據(jù)參考文獻(xiàn)[51]對浮板的鉸連接剛度的值以及其他參數(shù)進(jìn)行取值，驗(yàn)證以組合超大型浮體結(jié)構(gòu)為研究對象所得到的理論結(jié)果的可靠性和正確性，從而直接證明本文方法的正確性。同時，通過選取不同模態(tài)數(shù)來驗(yàn)證本方法求解結(jié)果的收斂性，間接證明本文方法的可行性和可靠性。 再次，針對不同周期荷載作用，研究了在鉸連接位置固定的前提下，鉸扭轉(zhuǎn)剛度對組合超大型浮體結(jié)構(gòu)的水彈性響應(yīng)的影響規(guī)律。另外研究了在鉸扭轉(zhuǎn)剛度不變情況下，鉸連接位置對組合式浮體結(jié)構(gòu)動響應(yīng)的影響規(guī)律。 最后，從減振方面考慮，通過對載荷作用的模塊各參數(shù)及連接剛度進(jìn)行優(yōu)化分析，得到合理的模塊參數(shù)和鉸扭轉(zhuǎn)剛度，以達(dá)到最大程度降低其對無外載荷作用浮體模塊的動響應(yīng)幅值。
[Abstract]:It is very important to study the hydrodynamic response of floating structure in order to construct a stable and reliable super large ocean operating platform. Because the horizontal dimension of the box-type super-large floating body structure is much larger than its height dimension, it is a typical flat structure, so the vertical stiffness of the floating body structure is relatively small, so it is necessary to consider its elastic deformation. Because of the large size and the limitation of the experiment, it is very difficult to study the hydroelastic response of the super-large floating body structure theoretically, so it is of practical significance to study the hydroelastic response characteristics of the super-large floating body structure. Because the size of floating body is very large, in order to transport, safety and other aspects of convenience, all require floating body design to achieve modularization, The assembly can be accomplished quickly by a certain connection (this paper simulates the hinge connection with different torsional stiffness). In order to meet the needs of practical engineering design, the rationality of connection design needs to meet the most basic requirements of hydrodynamic response. At the same time, the floating structure will be affected by the external load on the floating body in the actual engineering, so it is very important to study the dynamic response of the floating structure under the external load during the design and construction of the super-large floating structure. Taking the combined model of two box-type floating body structures connected by hinges as an example, this paper studies the influence of the parameters and the connection stiffness on the hydroelastic response of the composite super-large floating structure under different external loads. The specific research work of this paper is as follows: Based on the corresponding theoretical knowledge, a simplified computational model of the composite superlarge floating body structure is established. At the same time, according to the linear elasticity theory and the Mindlin thick plate dynamics theory, the governing equations and mixed boundary conditions of the composite superlarge floating body structure are established, and the related physical quantities and the corresponding expressions are dimensionless. By using Wiener-Hopf method, Fourier transform, Liouville theorem and residue theorem, the infinite algebraic equations for intermediate generalized functions are derived. Finally, by solving the infinite algebraic equations, the distribution of the dynamic deflection and the amplitude of the dynamic bending moment of the floating plate under external load is obtained. Secondly, according to reference [51], the value of hinge connection stiffness and other parameters of floating-plate can be obtained to verify the reliability and correctness of the theoretical results obtained by taking the composite super-large floating structure as the object of study. Thus the correctness of this method is proved directly. At the same time, the convergence of the solution results is verified by selecting different modal numbers, which indirectly proves the feasibility and reliability of the proposed method. Thirdly, the effect of hinge torsional stiffness on the hydroelastic response of composite super-large floating structure is studied under the condition of fixed hinged joint position for different periodic loads. In addition, the influence of hinge connection position on the dynamic response of composite floating structure is studied under the condition that the hinge torsional stiffness is invariable. Finally, considering from the aspect of vibration absorption, the reasonable parameters of the module and the torsional stiffness of the hinge are obtained by optimizing the parameters of the module and the connection stiffness of the load. In order to reduce the amplitude of dynamic response to the floating module without external load to the maximum extent.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P751;P731.2

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