Testing device for measuring flow-induced noise and vortex-induced noise of marine pipeline

Abstract

The invention provides a testing device for measuring flow-induced noise and vortex-induced noise of a marine pipeline, which comprises a pipe sleeve, a connecting mechanism, a damping mechanism, a diversion grid and a self-contained hydrophone, the pipe sleeve is mounted on the outer surface of the marine pipeline, one end of the connecting mechanism is placed in the pipe sleeve, the other end of the connecting mechanism is connected with the damping mechanism, and the damping mechanism is connected with the diversion grid, the self-contained hydrophone is placed in the diversion grid; according to the test device for measuring the flow-induced noise and the vortex-induced noise of the marine pipeline, the acoustic near-field effect caused by insufficient distance between the hydrophone and the submarine pipeline in a conventional test method is avoided, and the influence of large vortex pulsating pressure on the hydrophone is eliminated by utilizing the flow guide grid, the low-frequency interference caused by external ocean current in the testing process is reduced, the vibration reduction mechanism design is adopted, the normalization of the flow-induced noise and the vortex-induced noise of the ocean pipeline is more accurate, the measurement result is more reliable, and technical support is provided for the test measurement of the flow-induced noise and the vortex-induced noise of the ocean pipeline.

Description

technical field [0001] The invention relates to a test device for measuring flow-induced noise and vortex-induced noise of ocean pipelines, belonging to the field of acoustic measurement. Background technique [0002] At present, the flow-induced noise generated by the offshore pipeline under the excitation of internal oil flow, air flow and its multi-phase medium, and the vortex-induced noise generated by the external ocean current excitation of the offshore pipeline have attracted attention, because the flow-induced noise and vortex-induced noise will affect the surrounding environment. The navigation and detection capabilities of working underwater vehicles, UUV, etc., but how to accurately measure the flow-induced noise and vortex-induced noise of ocean pipelines is very difficult. Specifically in: [0003] First, the magnitude of flow-induced noise and vortex-induced noise of ocean pipelines is often relatively small, because the flow velocity inside ocean pipelines is...

AI Technical Summary

Problems solved by technology

[0003]First, the magnitude of flow-induced noise and vortex-induced noise of ocean pipelines is often relatively small, because the flow velocity inside ocean pipelines is generally not greater than 2m / s, and ocean The flow velocity of the ocean current outside the pipeline generally does not exceed 2m / s, and the magnitude of the flow-induced noise and vortex-induced noise is not much different from the background noise under this flow velocity condition, that is, the signal-to-noise ratio is very low;

[0004]Second, the hydrophone is very vulnerable to the turbulent pressure during the measurement process of the flow-induced noise and vortex-induced noise of the ocean pipeline, that is, the output "false sound" , because the volume of the hydrophone is limited, it has a better averaging and filtering effect on the high-frequency components of the wavenumber-frequency spectrum, that is, it has a better ability to reduce the high-frequency part of the "false sound", while the low-frequency component is due to the large vortex and The wave number is small, and the average effect on the surface of the hydrophone is very limited, so it will bring strong low-frequency interference in the measurement signal;

[0005]Third, the internal ocean current near the ocean pipeline will change all the time, blocked by the ocean pipeline, making the state of the ocean current change all the time, if the hydrophone used for measurement It cannot change with the state of the ocean pipeline in the ocean current, which will cause inaccurate measurement results. For example, when the measuring hydrophone is directly impacted by the ocean current, it will output a high electrical signal;

[0006]Finally, if the position of the hydrophone relative to the ocean pipeline shifts during the acquisition process, the sound pressure level of the ocean pipeline flow-induced noise and vortex-induced noise will be normalized to Problems arise in the calculation, and the flow-induced noise and vortex-induced noise of the ocean pipeline cannot be accurately estimated

[0007]In the past, most of the research on offshore pipelines focused on the process of oil wax deposition and pipeline corrosion resistance, and little or no attention was paid to the flow-induced noise and vortex-induced noise of marine pipelines. measurement problems, so little research has been done in this area

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