Hydrophone arc array low-frequency calibration device and calibration method thereof

Abstract

The invention discloses a hydrophone arc array low-frequency calibration device and a calibration method thereof. A simulation system comprises a vibration table, a liquid column fixedly arranged on the vibration table and a water tank attached to the outer side of the liquid column, and a calibration system comprises an arc array, a hydrophone array element arranged on the arc array, a reference hydrophone and an accelerometer arranged on the outer side of the liquid column. A suspension system comprises a transposition device and two suspension supports arranged on the transposition device, one suspension support can lift the arc array in a sliding and locking mode through a clamp at the tail end of a suspension rope of the suspension support, the other suspension support lifts the reference hydrophone through a suspension rope of the suspension support, and the transposition device can accurately exchange the positions of the two suspension supports. The hydrophone arc array low-frequency calibration device is easy to build on the land, can provide a stable low-frequency excitation and calibration environment for the arc array, takes into account the influence caused by the coupling of adjacent hydrophones, avoids the interference of the vibration of a liquid column and a water tank on the calibration, improves the calibration precision and speed, and avoids the repeated disassembly of the arc array.

Description

technical field [0001] The invention belongs to the field of ship noise testing and measurement, and in particular relates to a hydrophone arc array low-frequency calibration device and a calibration method thereof. Background technique [0002] Underwater noise testing has always been one of the important directions in the field of ship vibration and noise reduction, and it is a direct means to measure the effect of vibration and noise reduction: the underwater noise test results can reflect the characteristics and distribution of noise sources, and it is an important tool for low-noise design of ships. Provide important evidence and feedback. With the development of ship low-noise design technology, the underwater noise test system of ships has also been gradually upgraded. New underwater noise test systems such as acoustic holography and beamforming all use hydrophone arrays, which has brought about the development of hydrophone arrays. calibration problem. [0003] The...

AI Technical Summary

Problems solved by technology

With the development of ship low-noise design technology, the underwater noise test system of ships has also been gradually upgraded. New underwater noise test systems such as acoustic holography and beamforming all use hydrophone arrays, which has brought about the development of hydrophone arrays. calibration problem

[0003] The hydrophone array is generally composed of multiple hydrophones. The arc array is a common hydrophone array in the ship acoustic holographic measurement system. Due to the strong coupling between the hydrophone and the water, the hydrophone Broadband calibration of arrays is difficult to implement in air

In addition, due to the working characteristics of a large number of machinery and pump equipment on the ship, the main noise of the ship is mostly in the frequency band below 1kHz. The underwater noise test also focuses on this low frequency band. The hydrophone array is effectively calibrated in this frequency band. However, this frequency band is a difficult point for hydrophone array calibration: it is difficult to carry out in land experimental facilities such as anechoic pools, and it is necessary to choose open waters on the lake, the calibration cost is high, and low-frequency calibration on the lake There are also difficulties such as limitations of various underwater acoustic measurement conditions and criteria, and low-frequency preparation of underwater acoustic transducers.

Images