小尺度浮管結(jié)構(gòu)水動力特性研究
[Abstract]:Small-scale floating pipe structure is a basic element in ocean engineering, which widely exists in various marine engineering facilities, but its hydrodynamic characteristics under waves have always been controversial. Therefore, the selection of hydrodynamic coefficients of fixed members and the kinematic and mechanical characteristics of raft culture system with double floating pipe structure are studied in this paper. For fixed members, this paper mainly uses the principle of vertical lever, designs a new type of test device, extracts the force curve of floating pipe under current and wave, and based on Morison equation, The values of hydrodynamic coefficients CD and CM under different wave elements and the variation law of coefficients with wave phase angle are analyzed and calculated. The new wave height parameter KH, periodic parameter KT, is defined and analyzed. The hydrodynamic coefficients of small scale floating pipe structures under waves are analyzed comprehensively. The results show that when the hydrodynamic coefficient is not related to the wave phase angle, The wave height parameter KH, period parameter KT, Reynolds number Re has significant influence on the value of hydrodynamic coefficient: the whole CD,CM decreases exponentially with the wave height KH, and the whole CD,CM decreases with the increase of wave period KT. Under the same wave height, the CM increases with the increase of Re number, but the CD value is relatively stable. The results show that the hydrodynamic coefficient is closely related to the wave phase angle: the CD is basically "U" shaped, and the CM presents the law of periodic trigonometric function, which can be superposed by the trigonometric function of the double frequency and the second frequency of the wave and the constant term. Finally, the empirical formulas for the hydrodynamic coefficients CD and CM of wave conditions are given. For the raft culture system with double floating pipe structure, the motion and dynamics responses of different wave elements and setting angles are obtained by using CCD image acquisition system and force acquisition system through model tests. The effects of wave parameters and load loading on motion and dynamic response are studied. The results show that with the increase of wave height, the vertical amplitude increases linearly, and the increasing rate of the front wave surface is faster than that of the back wave surface, and the inclined angle of the tube raft decreases slightly with the increase of the period. The large period wave makes the stress distribution of the anchoring point on the front and back wave surface more uniform, and the increase of the weight will lead to the decrease of the system force and the horizontal amplitude, but it will lead to the violent change of the force and the inclination angle under the individual period, and the increase of the load weight will lead to the decrease of the force and the horizontal amplitude of the system as a whole. When the angle of the tube raft and the wave is 60 擄, when the angle of 30 擄is 30 擄, the tension of the anchor point of the tube raft is larger, the tension at 0 擄angle is the smallest, and when the angle is 60 擄, the maximum tensile force appears.
【學位授予單位】:浙江海洋學院
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:P751;P731.2
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