Large-scale structure hydrodynamic coefficient measuring device and method

Abstract

The invention provides a large-scale structure hydrodynamic coefficient measuring device and method. The measuring device comprises an experiment water tank, a support frame, a lead screw loading anddriving assembly and a measuring system; the support frame is arranged on the experiment water tank; the lead screw loading and driving assembly comprises a transverse lead screw, a vertical lead screw and a driving assembly used for driving the transverse lead screw and the vertical lead screw, the transverse lead screw is connected to the support frame, and the lower part of the vertical lead screw is connected with a manifold model through a connecting mechanism; the driving assembly drives the lead screws to drive the manifold model to realize translation and oscillation motion simulationof a manifold in the experiment water tank in the X direction, the Y direction and the Z direction according to set requirements; and the measuring system comprises a strain gauge connected to the lead screws and the driving assembly, a sensor and a data acquisition device connected with the sensor or the strain gauge. According to the measuring device, an experimental device is provided for hydrodynamic analysis and calculation of underwater large structure lowering and mounting in deepwater oil and gas development, and motion rules such as motion response and dynamic response of a large-scale structure in the lowering and mounting processes are accurately predicted and simulated.

Description

technical field [0001] The invention relates to the technical field of offshore petroleum machinery, in particular to a large structure hydrodynamic coefficient measuring device and a measuring method thereof. Background technique [0002] As my country's demand for energy continues to grow, my country's development of underwater oil and gas has gradually shifted from shallow water to deep water or even ultra-deep waters. [0003] As the core equipment of the subsea production system, large structures such as Christmas trees and manifolds are extremely important for the control and operation of their lowering and installation processes. It is necessary to predict the motion response and dynamic response of large structures during the lowering process, and analyze and calculate the hydrodynamic forces they receive, and accurately calculate the loads on the lowered structures, so as to expand the scope of applicable ships and improve the operating safety factor . [0004] At...

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Problems solved by technology

[0004] At present, there are several problems in the measurement of the hydrodynamic coefficient (damping coefficient, additional mass coefficient): (1) The current measurement of the damping coefficient of large underwater structures is to use a small boat to drag the model at a fixed speed, so that its The frontal area in the water cannot be maintained, and the accuracy of the measured hydrodynamic coefficient is not high, which makes it easy to mislead the actual project

(2) At present, the measurement of additional mass coefficient mainly adopts the four corners of the spring connection manifold model, which is obtained through vibration and monitoring force and speed measurement. This method is too cumbersome in the process of switching heave, sway and surge. It is necessary to untie the U-shaped buckle fixing the steel strand and the model, and then fix the steel strand and the model through the U-shaped buckle to adapt to other directions, so it is difficult to measure the hydrodynamic coefficient in terms of economy and accuracy. combination of

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