A Rigid Cylindrical Vortex-Induced Vibration Test Device Achieving Nonlinear Boundary Conditions
A technology of boundary conditions and vortex-induced vibration, which is applied in fluid dynamics test, machine/structural component test, measuring device, etc., can solve the problems of lack of experimental research and failure to consider the influence of vortex-induced vibration response of suspended pipelines, etc.
Active Publication Date: 2016-09-14
河南天宏重工科技有限公司
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However, in this paper, only the numerical method is used to predict the vortex-induced vibration under the nonlinear boundary conditions of the pipe-soil coupling, and there is no experimental research
However, most of the existing submarine suspended pipeline tests simply take the boundary conditions as linear spring-supported boundaries, or even treat them as simply supported or fixed boundaries, without considering the influence of pipe-soil coupling nonlinearity on the vortex-induced vibration response of suspended pipelines
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[0018] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0019] combine Figure 1~5 , the present invention includes a nonlinear spring 1, a vertical restraint mechanism 2, a cylindrical model 3, a support 4, a support frame 5, and a data acquisition and analysis processing system 7.
[0020] Cylindrical model 3 adopts thick-walled steel pipe, and its diameter should be determined according to the flow-making capacity of the pool or tank. Under the condition of meeting the maximum velocity or Reynolds number required for the test, a large-diameter cylindrical model should be used as much as possible to obtain a larger Bending stiffness to avoid bending vibrations in cylindrical models. A shorter cylindrical model can also be used, but not shorter than 1m, so as to avoid the influence of the free liquid surface of the tank on the test accuracy.
[0021] Such as Figure 4 As shown, the support frame 5 is welded by 12 s...
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The invention aims at providing a rigid cylinder vortex-induced vibration testing device capable of achieving nonlinear boundary conditions. The rigid cylinder vortex-induced vibration testing device comprises nonlinear springs, a vertical restraining mechanism, a cylinder model, a support, a clamp, a supporting frame and a data collecting and analyzing processing part. The data collecting and analyzing processing part is used for collecting and analyzing vibration data of the cylinder model. The vertical restraining mechanism is composed of box iron, a cardan joint, a bolt and an aluminum alloy pipe. The adopted cardan joint has the advantages of being small in damping and flexible in structure. The vertical restraining mechanism is used for enabling vibration of the cylinder model to be kept in the same horizontal plane. A nonlinear boundary cylinder system is jointly composed of the vertical restraining mechanism, the support and the nonlinear springs. The rigid cylinder vortex-induced vibration testing device can be applied to rigid cylinder vortex-induced vibration tests of a circulating water channel or a towing tank, and the vortex-induced vibration mechanism under nonlinear rigidity such as contact between a seabed suspended span pipe and the seabed can be truly simulated.
Description
technical field [0001] The invention relates to a test device, specifically a cylindrical vortex-induced vibration test device. Background technique [0002] Vortex-induced vibration is a special vibration form of a cylinder in the flow field, and it is the vibration caused by the vortex shedding at the wake of the cylinder. There have been decades of research history on vortex-induced vibration at home and abroad, but in recent years, the vortex-induced vibration of pipelines caused by the development of offshore oil and gas fields has set off a new round of research upsurge. [0003] At present, the model test is one of the most important and reliable research methods to study the phenomenon of vortex induced vibration. Through the model test, the phenomenon and main characteristics of vortex-induced vibration can be observed more comprehensively, and more reliable test results can be obtained. The test results can be used to verify the accuracy of the theoretical and nu...
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IPC IPC(8): G01M10/00
Inventor 艾尚茂孙丽萍徐刚
Owner 河南天宏重工科技有限公司