波浪對(duì)彈性支撐平板結(jié)構(gòu)沖擊作用的實(shí)驗(yàn)研究
[Abstract]:Wave impact (also called slamming) is a strong impact collision phenomenon between wave and structure, which involves the complex coupling of solid, fluid and gas three-phase medium. Severe wave shocks can cause local damage to the structure or collapse of the structure as a whole. For elastic marine structures, a complex dynamic process is formed by the vibration response of the coupled structures subjected to wave impact. With the development of hydroelasticity in coastal and offshore engineering, there is an urgent need to carry out systematic and in-depth research on the mechanism of wave impact process and to understand the dynamic response of structures under the action of wave impact. In this paper, the characteristics of impact load and dynamic response of elastic braced plate structure under wave action are studied by physical model test. The experiment was carried out in the wave tank of Dalian University of Technology. Three kinds of structural models with different bracing stiffness were designed and the dynamic characteristics of the structural models were obtained by static displacement method and transient excitation method. The simultaneous measurement data of the wave impact pressure and the vibration acceleration of the structure are obtained by using the Crio-9074 multi-channel synchronous acquisition system. In this paper, the probability theory is used to analyze the wave impact pressure on the bottom of the plate structure with elastic support, and the probability distribution curve of the peak value of wave impact pressure and its expression are given. The relationship between the dynamic characteristics of the incident wave elements and structures and the characteristic parameters of the super-value distribution curve is analyzed. Based on the synchronous analysis of the wave impact force and the vibration acceleration of the flat plate structure, the synchronous variation characteristics of the wave impact process and the plate structure motion process are given. Four characteristic stages of the simultaneous duration curve of wave impact force and vibration acceleration are analyzed, that is, wave impact stage, dynamic water action stage, fluid shedding stage and free vibration stage. The effects of elastic brace stiffness, incident wave height, wave period and relative clearance on impact duration are discussed. Based on the results of statistical analysis and spectrum analysis of wave impact load, the distribution law of peak wave impact pressure along the bottom of plate structure is given. The effects of brace stiffness, incident wave elements and relative clearance on the peak value of wave impact pressure (impact force) are analyzed, and the influence of support stiffness on wave impact load amplitude spectrum is discussed. It is concluded that the wave impact load on the structure increases with the increase of the brace stiffness. The frequency domain integral method is used to obtain the duration curve of vibration velocity and displacement of the plate structure from the acceleration duration curve, and the frequency spectrum analysis of the structural dynamic response is carried out. The influence factors of dynamic response of plate structure are analyzed, and the relationship between brace stiffness and amplitude spectrum of structural dynamic response is discussed. The results show that the vibration acceleration of the structure increases with the increase of the support stiffness, and the vibration velocity and displacement decrease with the increase of the support stiffness.
【學(xué)位授予單位】:大連理工大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TV139.2
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