Underwater target radiation noise measurement combined volume array and measurement method

Abstract

The invention discloses an underwater target radiation noise measurement combined volume array and a measurement method, the measurement combined volume array comprises a spiral double-cone sound pressure volume array and a vector sparse vertical array, the spiral double-cone sound pressure volume array is specifically as follows: the bottom ends of M identical uniform vertical linear arrays are uniformly arranged on a circumference with a radius R to form a cylindrical array with the radius of R and the height of L, then the bottom ends of all vertical linear arrays are fixed, the top ends of all the vertical linear arrays are anticlockwise rotated by the same angle alpha around the axis of a cylinder in the circumferential direction of a circle, a defined spiral double-cone array is obtained, the number of array elements of the uniform vertical linear arrays is N, the array element interval is d1, and the length is L; and the vector sparse vertical array has NS array elements in total, d2 is an array element interval, a central array element of the vector sparse vertical array is located at the center of a circle of a circular cross section with the minimum radius of the spiral double-cone sound pressure volume array and is perpendicular to the cross section, and the array elements are uniformly distributed. According to the invention, high-precision radiation noise measurement of the full frequency band of the underwater target is realized.

Description

technical field [0001] The invention belongs to the technical field of underwater target radiation noise measurement and evaluation, and relates to an underwater target radiation noise measurement combined volume array and a measurement method. Background technique [0002] With the continuous development of vibration and noise reduction technology, the radiation noise level of underwater targets is getting lower and lower, which puts forward higher and higher requirements for radiation noise measurement technology. The traditional radiated noise measurement method generally uses a single sound pressure hydrophone, and then developed into a horizontal line array, vertical line array, and volume array measurement method composed of multiple sound pressure hydrophones [Liu Wenshuai, Xia Chunyan, Liu Yudong, etc. Vertical line array measurement of quiet submarine radiated noise [C]. Symposium on Ship Underwater Noise. 2005.]. However, the above measurement methods have their l...

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Problems solved by technology

However, the above measurement methods have their limitations: single sound pressure hydrophone is easy to configure, but it cannot provide the required measurement gain, and at the same time, it cannot suppress multi-channel interference in the channel; the vertical line array can realize broadband noise measurement and effectively reduce the sea level. The impact of noise and channel multi-channel interference, but because the vertical line array cannot form unilateral directivity, there is no processing gain in the horizontal space, resulting in a low measurement gain for the vertical array

At the same time, the vertical array aperture required for low-frequency testing is large. At this time, there are still problems such as difficult layout and difficult control of the array. In order to improve the measurement gain of the array, a volume array can be used for measurement

The volume array has unilateral directivity, which can obtain a large array measurement gain, but it also needs a large array aperture when realizing low-frequency noise measurement. Most of my country's coastal waters are shallow seas, and the water depth is generally less than 100 meters. Excessive sound pressure The hydrophone array is not conducive to the actual field test measurement and engineering realization. Therefore, the volume array is suitable for the radiation noise measurement in the middle and high frequency bands

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