System for testing vortex-induced vibration traveling wave of structure with large length to diameter ratio

Abstract

The invention discloses a system for testing a vortex-induced vibration traveling wave of a structure with a large length to diameter ratio, and belongs to experiment testing systems of the technical field of ocean engineering. The system for testing the vortex-induced vibration traveling wave of the structure with the large length to diameter ratio comprises a trailer, an experimental model, a model restrain device, a tension device and a measuring device. The left end of the model is connected to the side plate of a carriage through a spring, and the right end of the model is connected to the spring of a mounting plate through a universal joint and three fixed pulleys. The spring of the mounting plate provides initial tension for the model. A grating strain sensor, a tensiometer and an acceleration sensor are arranged in the experimental model, the tension device and the mounting plate in a scattered mode. The model restrain mode of the system promote a structure model to generate vortex-induced vibration traveling waves under dragging of the trailer, the tension system of the system can achieve free control of the tension of the end portion of the model, and therefore traveling wave propagation situations under different tensions can be researched.

Description

technical field [0001] The invention relates to an experimental test system in the technical field of marine engineering, in particular to a test system for testing the traveling wave characteristics of vortex-induced vibration of structures with a large length-to-diameter ratio. Background technique [0002] In recent years, due to the large demand for oil and gas resources in countries around the world, offshore oil and gas development has gradually moved from offshore to deep sea areas. Marine structures such as marine risers and oil pipelines serving in deep sea areas face more prominent vortex-induced vibration problems. The length-to-diameter ratio of these structures reaches the order of 102 to 103, and they belong to structures with a large aspect ratio. Similarly, anchor cables, an important part of floating tunnels in water, are also a type of structure with a large aspect ratio that faces the problem of vortex-induced vibration. Vortex-induced vibration is the vi...

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Problems solved by technology

After analysis, the above representative experimental work was not aimed at systematically observing the traveling wave phenomenon. The restraint method, tension control method and sensor arrangement at the end of the model did not take into account the need to observe the traveling wave phenomenon. For example, the complete spring connection was not used. Constraint mode, model tension can not be adjusted arbitrarily

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