98 results about "Hydrophone array" patented technology

The invention discloses a sound barrier sound insulation characteristic evaluation method suitable for a real ship complex sound field, and belongs to the technical field of real ship sound barriers, and the method comprises the steps: arranging hydrophone arrays at acoustic mirror symmetry positions at two sides of a real ship fairing sound barrier to form an in-situ measurement pair; controlling the ship to sail at a plurality of navigational speeds, and synchronously acquiring sound pressure time domain signals on two sides; carrying out preprocessing and time-frequency analysis on the signals, and calculating sound pressure levels of a sound facing surface and a sound backing surface to obtain an in-situ sound pressure level difference; and based on the sound pressure level difference at different navigational speeds, analyzing the change rule of the sound insulation performance along with the frequency and the navigational speed, and carrying out comprehensive evaluation. In addition, by arranging a vibration sensor and a turbulence measuring device, path separation of structural sound and flow-induced noise is achieved, spatial coherence weighted average is introduced, and the accuracy and representativeness of evaluation under a complex sound field are improved. The method overcomes the limitations of laboratory test environment distortion and single working condition, and can truly and comprehensively reflect the actual sound insulation efficiency of the sound baffle in the dynamic navigation of a real ship.

The invention discloses a digital equivalent source sound field reconstruction system based on an underwater complex sound field environment. The digital equivalent source sound field reconstruction system comprises a sound pressure acquisition module which acquires radiation sound pressure data on a measurement point through a hydrophone array; the intelligent analysis module is used for performing shallow sea sound pressure Green function derivation by utilizing a shallow sea Pekeris waveguide model based on the radiation sound pressure data, and constructing an underwater sound field equivalent source equation; the compressed sensing module is used for converting an underwater sound field equivalent source equation into a compressed sensing problem based on the underwater sound field equivalent source equation, and solving a norm for reducing L1 by adopting an algorithm under an accelerated near-end gradient to obtain compressed sensing equivalent source intensity; and the sound field reconstruction module is used for constructing a free field green function, obtaining underwater reconstruction sound pressure by combining the free field green function with the compressed sensing equivalent source intensity, realizing digital equivalent source sound field reconstruction of an underwater complex sound field environment, improving data processing efficiency and reducing requirements on computing resources.

The invention discloses a vector hydrophone array orientation estimation method for performing tensor decomposition by using a propagation operator, relates to the technical field of vector hydrophone array orientation estimation, and discloses a vector hydrophone array orientation estimation method for performing tensor decomposition by using a propagation operator. The method comprises the following steps: firstly, constructing a three-dimensional array manifold tensor composed of an array direction matrix and a vector hydrophone output matrix; respectively expanding received signal tensors according to three modes, solving a propagation operator based on a column block covariance matrix, constructing a normalized signal subspace, establishing a spatial spectrum function with a noise subspace, and obtaining a pitch angle and an azimuth angle of a sound source through spectrum peak search; according to the method, high-order singular value decomposition is avoided, the operand is greatly reduced, meanwhile, high resolution and low sidelobe direction finding performance are kept, and the method is suitable for a real-time underwater acoustic direction finding system of a ship-borne platform, a buoy platform and an unmanned platform.

The invention discloses a digital twinning-AI prediction driven cofferdam directional micro-blasting system, which relates to the technical field of underwater blasting engineering, and comprises the following steps of: constructing multi-domain digital twinning, reading a compliance rule machine by a loading machine, fusing a hydrophone array, shore-based vibration and distributed optical fiber observation assimilation to form a baseline field; defining an isobaric surface leakage volume, a sector deflection angle, a closure degree and a frequency band energy ratio, and establishing two sets of equivalent boundary admittances and preselection of a switchable physical layer; training a multi-output AI element model, combining opportunity constraint and hard constraint, performing linkage optimization on a physical layer and a detonation network, and generating a linkage instruction and a sensitivity atlas; and small-dose trial explosion is executed by a hierarchical correction state machine, and on-line guarding and knowledge writing-back are carried out in combination with sequential ratio test and quantile tracking. And minute-level interpretable prediction can be realized, leakage and direction drift are inhibited, the safety of an ecological structure is guaranteed, and the construction period and the cost are reduced.

The invention provides a method and system for measuring the sound source radiation sound power level in a reverberation pool, and the method comprises the steps: constructing a reverberation test system according to a preset standard, laying a hydrophone array and a to-be-measured sound source in the reverberation pool, and enabling the array element spacing of the hydrophone array to be smaller than or equal to the minimum half-wavelength; enabling the to-be-detected sound source to emit a to-be-detected signal, and collecting complete time domain sound pressure data of the to-be-detected signal; calculating the mean square sound pressure level of the measuring point in the reverberation control area based on the steady-state time domain sound pressure data of the sound signal; calculating complete time domain sound pressure data of all array elements based on Fourier transform to obtain a sound energy density change curve, and fitting the sound energy density change curve to obtain reverberation time; sound field correction is obtained through calculation according to the reverberation time, and the radiation sound power level of the sound source to be measured is obtained according to the sound field correction. According to the invention, the experiment process is simplified, the measurement efficiency is obviously improved, the experiment cost is reduced, and a new technical approach is provided for the rapid measurement of the water pool of the sound source radiation sound power level.

The invention relates to a multi-source intelligent combined pose measurement method for a floating hydrophone array, and the method comprises the following steps: 1, obtaining the pose information of each node of the hydrophone array through a multi-source sensing module, and synchronously receiving sound signals and extracting the TDOA information of each node under the condition that the sound source position is known; step 2, constructing a measurement equation based on TDOA information, and performing inverse solution on the position of each node of the hydrophone array in combination with a hyperbolic positioning principle and a sound velocity model; according to the method, an inverse solution positioning mode of'known sound source position and inverse solution of receiving array node position 'is adopted, a flexible underwater acoustic array dynamic measurement scene under the traction of a floating platform is specially aimed at, the technical limitation that traditional TDOA and USBL positioning depends on a fixed geometric structure is broken through, the method does not need to arrange a plurality of reference receiver arrays, and the positioning accuracy is improved. And a high-precision synchronous clock system is not needed, and high-precision acoustic positioning can be realized only by depending on a single sound source and the distributed nodes, so that the system complexity and the field deployment cost are remarkably reduced.

The present application relates to the technical field of ultra-short baseline direction measurement data processing, and particularly relates to a direction estimation method of a multi-element stereo hydrophone array. The method approximates sound waves as plane waves and establishes a mathematical relationship between time difference of arrival (TDOA) and a direction vector, takes TDOA as an observation value, calculates a direction vector estimation value according to a weighted least square method, then calculates the equivalent weight of the observation value according to an equivalent weight function, further replaces the original observation value weight array with an equivalent weight array, and recalculates the direction vector according to the weighted least square method, iteratively calculates the equivalent weight and the direction vector, until the difference between the direction vectors of two consecutive times is less than a manually set threshold, and the direction vector is output as the direction of the multi-element stereo hydrophone array. The present application can weaken the influence of the sound ray bending which is not considered in the direction estimation function model, and consider the influence of the array element spacing and the target direction on the direction estimation, thereby improving the accuracy and reliability of the direction estimation of the multi-element stereo hydrophone array.

The application discloses a passive sonar ranging method and device for a linear fiber hydrophone array, which comprises the following steps: performing primary beam forming according to original data at a first position, searching for a first azimuth angle with the maximum signal strength according to the primary beam forming result; performing secondary beam forming according to original data at a second position, searching for a second azimuth angle with the maximum signal strength according to the secondary beam forming result; and then calculating the target distance according to the first azimuth angle, the second azimuth angle, the speed and the running time. Compared with triangulation, the method and the device can reduce the measurement deviation caused by the uncertainty of the position of the fiber hydrophone array, the distance variance is smaller, and the reliability is higher in actual use.

The application discloses a kind of ship underwater noise tracking monitoring device and method, the method includes the following steps: 1) the monitoring device is installed to ship;2) keep ship in the channel in the state of stop, each hydrophone is monitored in the channel ambient noise, and data acquisition equipment records ambient noise signal;3) according to test condition, ship equipment is normally opened or runs;4) ship is normally navigated in the channel, and data acquisition equipment records the sound wave signal measured by hydrophone;5) based on the ambient noise monitored in step 2), the sound wave signal measured by each hydrophone is removed ambient noise, and all the noise-removed underwater radiated noise signals of the ship are analyzed and processed.The application is arranged with tracking measurement hydrophone array around the ship, and the ship is monitored under various conditions in line with the actual situation, with the real ship flow field around the ship during navigation, and the monitoring result has high accuracy.

The application discloses a kind of robust hydrophone array azimuth estimation method.This patent scheme introduces amplitude-phase error correction, utilizes phase error vector and energy normalization, realizes the correction of amplitude-phase error.Covariance matrix is reconstructed using the corrected data, and spatial spectrum is calculated using the reconstructed covariance matrix, then the first order differential function of spectrum function is calculated, and the spectrum peak search is carried out on the differential spatial spectrum curve to estimate the incident signal direction of arrival.The simulation experiment and lake test experiment results show that the method greatly reduces the influence of amplitude-phase error on DOA estimation performance, improves the estimation accuracy of direction, and has low computational complexity.This patent scheme has important application value in submarine and ocean mobile observation platform and other ocean instruments, and has high practical engineering application value.

The invention discloses a dynamic adjustable acceleration sensor with high sensitivity and low noise, and relates to the field of acceleration sensors. According to the acceleration sensor, a plurality of cantilever beam supporting sheets are stacked in sequence and are connected with a base; a piezoelectric element is fixed in a central circular area of the cantilever beam supporting sheet on the topmost layer, a plurality of mass sheets are sequentially stacked in an outer ring girdle area, longitudinal excitation deformation is easily conducted to the piezoelectric sheet, and stress is concentrated at the joint of the cantilever beam supporting sheet on the bottommost layer and the base under the condition of transverse excitation, so that the directivity of the acceleration sensor is better, and the stability of the acceleration sensor is improved. The charge output in the horizontal direction is small; the detachable assembly of the cantilever beam supporting sheet and the mass sheet is beneficial for improving the adjustability of performance parameters and the phase amplitude consistency in array application, and the high-sensitivity adjustable structural design and the collaborative optimization design of material physical property parameters jointly achieve high sensitivity, excellent bandwidth adjustability and extremely low background noise. The method is suitable for complex underwater sound environments such as hydrophone arrays.

The application provides an improved sparse learning out-of-grid direction-of-arrival estimation method based on variational Bayesian. The method is characterized in that: the original data received by a hydrophone array is preprocessed, a real value transformation is used to convert a vectorized covariance matrix signal in a complex number field to a real number field, and the idea of variational sparse Bayesian learning and grid evolution is combined to make the grid evolve from an initial uniform grid to a non-uniform grid adaptively in an iteration process. The evolution process includes grid updating and grid fission. The evolved grid points are gradually close to the real source position through the alternately iterative grid updating process and grid fission process. Compared with the traditional compressed sensing method, the method has higher DOA estimation accuracy, reduces the operation complexity, optimizes the operation efficiency, improves the resolution capacity of the source, and has higher application value in actual engineering, especially in the case of few snapshots and low signal-to-noise ratio.

The application discloses a kind of optical fiber hydrophone array optical path difference test system and method, by wideband light source, tunable laser, isolator, acoustooptic modulator, photoelectric detector, data acquisition system, computer is formed, wideband light source and tunable filter are used to realize wavelength scanning, output wavelength is the continuous light of λ;Acoustooptic modulator enters the continuous light of optical fiber hydrophone array and is modulated into pulsed light;Photoelectric detector converts optical signal into electrical signal;Data acquisition system shows and converts the signal collected by photoelectric detector into digital signal and then transmits to computer, and optical path difference is calculated by computer.The application has the characteristics of simple structure, small mathematical operation amount, wavelength adjustable, high measurement accuracy, strong system reliability and the like, meets the real-time online measurement demand of optical path difference in the process of optical fiber hydrophone array, and has very wide application prospect.

A half-spectrum search low-complexity azimuth estimation method for sound pressure and vibration velocity combined dimension reduction processing relates to the field of array signal processing, and comprises the following steps: acquiring output signals of a vector hydrophone array under N snapshots, and establishing a far-field target sound signal model; constructing a sampling covariance matrix for the output signal, and separating the sampling covariance matrix into a real part and an imaginary part; the vibration velocity signals in the vector array are synthesized in the guide angle direction through Givens transformation, a synthesized vibration velocity signal is constructed, and the synthesized vibration velocity signal and the sound pressure signal are jointly processed to construct a joint covariance matrix; constructing a DOA estimation model by using the real part of the joint covariance matrix, and constructing a spatial spectrum function based on the DOA estimation model and the real part of the joint covariance matrix; and searching a spectral function peak value in a half interval of a scanning angle space, and judging a real target angle according to a MUSIC algorithm. According to the method, the calculation amount is reduced while the estimation performance is ensured, and the problem that a traditional DOA estimation method is high in calculation complexity is solved.

The invention discloses a flexible braided layer reinforced optical fiber hydrophone array, which is characterized in that an inner protection assembly sleeves the outer side of a layer stranded cable, the end part of the inner protection assembly is provided with a pipe cable joint, the axis of the pipe cable joint deviating from the inner protection assembly is provided with a cable via hole, and the cable via hole is used for the layer stranded cable to pass through and is fixedly connected with the layer stranded cable so that the layer stranded cable is arranged deviating from one side; the hydrophone probe and the layer stranded cable are arranged on the two sides in the inner protection assembly respectively, the framework supporting assembly is arranged in the inner protection assembly, the two ends of the sealing connector assembly can be used for pipe cable connectors to be connected in a sealed and inserted mode, and the flexible woven outer layer is formed by integrally weaving a non-metal flexible woven piece and comprises a first woven section and a second woven section which are different in radial size. The first weaving sections and the second weaving sections are attached to and wrap the inner protection assembly and the sealing connector assembly in a one-to-one correspondence mode, the tensile property of the array is remarkably improved, meanwhile, the abrasion resistance of the outer surface of the array can be remarkably improved, and integrated weaving forming of the flexible weaving outer layer is easy to achieve.

The application discloses a digital equivalent source sound field reconstruction system based on an underwater complex sound field environment, and comprises the following modules: a sound pressure acquisition module that acquires radiated sound pressure data at a measurement point through a hydrophone array; an intelligent analysis module that, based on the radiated sound pressure data, derives a shallow sea sound pressure Green function by using a shallow sea Pekeris waveguide model, and constructs an underwater sound field equivalent source equation; a compressed sensing module that, based on the underwater sound field equivalent source equation, converts the underwater sound field equivalent source equation into a compressed sensing problem, and solves the compressed sensing problem by using an accelerated proximal gradient descent algorithm to obtain a compressed sensing equivalent source strength; and a sound field reconstruction module that constructs a free field Green function, and obtains underwater reconstructed sound pressure by combining the free field Green function with the compressed sensing equivalent source strength, so that the digital equivalent source sound field reconstruction of the underwater complex sound field environment is realized, the data processing efficiency is improved, and the demand for computing resources is reduced.

Aspects of the subject technology relate to systems, methods, and computer readable media for estimating acoustic spectra. Acoustic data can be received at a hydrophone array from a first acoustic source and a second acoustic source in a downhole environment. An initial noise spatial correlation matrix estimation can be generated based on the acoustic data. The initial noise spatial correlation matrix estimation can be applied to a beamformer to generate a first source spectra estimation for the first acoustic source and the second acoustic source. A revised noise spatial correlation matrix estimation can be generated based on the first source spectra estimation. The revised noise spatial correlation matrix estimation can be applied to the beamformer to generate a second source spectra estimation for the first acoustic source and the second acoustic source in the downhole environment based on the first source spectra estimation.

The invention discloses a Bernoulli filter-based single target detection and DOA tracking method and system, and relates to the field of target tracking. The method solves the problems that a traditional tracking algorithm after detection cannot jointly detect the target when the underwater target repeatedly enters under the conditions of low signal-to-noise ratio and small snapshot, and the tracking effect is unstable. The method comprises the steps of constructing a Bernoulli random finite set model, defining a single target state as a dynamic description target state or a dynamic description target state, predicting the target existence probability by using a Bernoulli Markov process, and generating a prediction state distribution particle set composed of new particles and survival particles through particle filtering. A hydrophone array signal is decomposed into a noise subspace observation model and a signal subspace observation model, a generalized likelihood function after exponential weighting is used for updating a target posteriori existence probability and a particle weight, and an equal-weight particle set is generated through resampling. And judging whether the target exists or not according to the single-target posterior existence probability, thereby realizing single-target DOA joint detection and tracking.

The invention relates to the technical field of beam forming, in particular to a single-sample neural network beam forming method combining formation and target orientation estimation and related equipment. According to the method, underwater acoustic signals are obtained based on a hydrophone array and are subjected to Fourier transform to form multi-frequency-point spectrum data, and a closed-loop neural beam forming frame is constructed. A sample covariance matrix is generated by using the multi-frequency-point data, and an empirical covariance matrix is obtained through an exponential weighted moving average algorithm. And inputting the time sequence convolutional network to extract cross-frequency covariance features, and generating a feature domain interference suppression control quantity which is used for constructing a robust covariance matrix and completing beam forming. And optimizing the broadband azimuth spectrum and updating the steering vector in combination with a formation adaptive mechanism, and finally obtaining the broadband azimuth spectrum and a target direction estimation result. According to the method, robust covariance estimation is realized, broadband interference is effectively suppressed, and formation errors are adaptively corrected, so that the accuracy and reliability of broadband target orientation estimation are remarkably improved.

The application relates to a bistable SR system and a low signal-to-noise ratio multi-frequency sound signal detection device and method. By introducing an optical fiber device, the closed-loop regulation of the optical fiber grating is utilized to realize the random resonance phenomenon based on the bistability, and the low signal-to-noise ratio signal can be effectively extracted under the strong noise background. Secondly, by introducing a carrier signal, the difference frequency signal is obtained by mixing with the external signal, and the multi-frequency signal sensing is realized under the premise of fixing the detection range of the difference frequency signal. In addition, by introducing the array structure of the optical fiber hydrophone, the spatial gain is formed, and the high-sensitivity detection effect can be realized. Finally, the frequency distribution and the relative signal-to-noise ratio intensity size distribution of the obtained target sound signal can be used as the input of the neural network model, the intelligent identification of the low signal-to-noise ratio target sound target is realized, and the detection and early warning of the underwater target can be maximally realized.

This invention provides a method for locating leaks in water supply networks based on deep learning and a hydrophone array, belonging to the field of water supply network leak detection technology. The method includes: deploying a hydrophone array in the water supply network monitoring area to acquire acoustic signals collected by each hydrophone; preprocessing the acoustic signals; inputting the preprocessed signal data into a pre-trained deep learning feature extraction network to obtain a high-dimensional feature vector reflecting the characteristics of the leaking acoustic waves; calculating a first leak location parameter and a second leak location parameter based on the high-dimensional feature vector, where the first leak location parameter characterizes the spectral characteristics of the leaking sound source, and the second leak location parameter characterizes the spatial attenuation characteristics of the sound wave propagating along the pipeline; and determining the specific location of the leak based on the first and second leak location parameters and the geometric position of the hydrophone array using a location algorithm. This invention combines deep learning for automatic feature extraction with physical parameter correction of the propagation model, improving the accuracy and robustness of leak location.

The utility model discloses a low -noise hydrophone array with easily dismounts support, including support and fixed on the support a plurality of low -noise hydrophone, the support includes mounting panel and hydrophone mounting spare, is equipped with vertical support between hydrophone mounting spare and mounting panel, and hydrophone mounting spare is connected with mounting panel through vertical support, hydrophone mounting spare includes horizontal bar, and the both ends fixed first buckle with vertical support fixed connection of horizontal bar, and the horizontal bar is opened in the sliding slot, and the sliding slot is slidably provided with a plurality of hydrophone holder's of low -noise hydrophone's hydrophone holder, advantage: realize the adjustment of different interval between hydrophone array element, and ensure that hydrophone array can work at the same water depth height.

The application relates to the technical field of seabed communication and discloses an eccentric structure optical fiber hydrophone array which comprises a cable main body, an eccentric glue-filling plug core assembly fixedly arranged at one end of the cable main body, a threaded adapter assembly fixedly arranged outside the cable main body and located at one side of the eccentric glue-filling plug core assembly, and a support framework assembly fixedly installed outside the cable main body and located at the side, away from the eccentric glue-filling plug core assembly, of the threaded adapter assembly. The hydrophone and the delay line are oppositely arranged inside the fiber-receiving box. Compared with a single hydrophone, the delay line can flexibly adjust parameters such as the length of the wound optical fiber according to requirements. The parameters of the hydrophone are determined in advance, project time is shortened, and cost is saved. Through the V-shaped ring multilayer sealing structure, the V-shaped ring sealing nut can press the V-shaped ring pressing ring, the V-shaped ring middle ring and the V-shaped ring supporting ring, radial sealing force is generated, and high sealing performance is achieved.

The invention provides a low-flow-resistance sound-transmission flow guide structure of an underwater unmanned vehicle and a manufacturing method, and belongs to the technical field of underwater unmanned vehicle carrier structures. The low-flow-resistance sound-transmission flow guide structure comprises a body shell plate and a sound-transmission dorsal fin flow guide cover; the body shell plate and the sound transmission dorsal fin fairing are of an integrated structure made of different materials, the body shell plate is installed on a carrier structure of the unmanned underwater vehicle, a load sound baffle is installed in the sound transmission dorsal fin fairing, and a hydrophone array element is installed between the load sound baffle and the sound transmission dorsal fin fairing. The low-flow-resistance sound-transmission flow guide structure provides a high-sound-transmission carrying environment for the hydrophone array elements and protects the hydrophone array elements in all directions, and meanwhile, the structure serves as a part of an unmanned underwater vehicle carrier structure to meet the requirements for strength, low flow resistance and low noise of the unmanned underwater vehicle carrier structure. According to the low-flow-resistance sound-transmitting flow guide structure, the incident flow area exceeding the envelope surface of the unmanned underwater vehicle is reduced to the maximum extent, and the influence of overall water resistance and navigation noise is reduced to a reasonable level.

The utility model discloses an adjustable optical fiber hydrophone array pressure testing device which comprises a testing device body, an optical fiber hydrophone array body and a booster pump installed on the front side of the testing device body, an adjusting mechanism is arranged at the lower end of the testing device body, and the adjusting mechanism comprises a movable column, a lower connecting plate and a movable rod. The adjusting mechanism drives the optical fiber hydrophone array body to form a lifting structure in the test device main body, and the top plate is clamped at the upper end of the test device main body. According to the adjustable optical fiber hydrophone array pressure test device, the optical fiber hydrophone array body can be conveniently driven to enter the test device main body to be supported, the optical fiber hydrophone array body can be placed and limited, the arrangement of the top plate and the upper connecting plate is combined, the optical fiber hydrophone array body can be conveniently fixed in the test device main body, and the test efficiency is improved. The stability in the test process is improved, and the overall stability in the detection process is very good.

The application discloses a flexible braided layer reinforced optical fiber hydrophone array, an inner protection assembly is sleeved on the outside of a layer cable, and a pipe cable joint is arranged at the end of the inner protection assembly; the pipe cable joint is provided with a cable through hole which is offset from the axis of the inner protection assembly, the cable through hole is used for passing and fixing the layer cable so that the layer cable is arranged on one side, a hydrophone probe is arranged on the two sides of the layer cable in the inner protection assembly, a framework support assembly is arranged in the inner protection assembly, the two ends of a sealing joint assembly are used for sealingly inserting the pipe cable joint, a flexible braided outer layer is integrally braided by non-metal flexible braided members and comprises first and second braided sections with different radial dimensions, and the first and second braided sections are respectively and correspondingly wrapped on the inner protection assembly and the sealing joint assembly, so that the tensile property of the array is remarkably improved, the wear resistance of the outer surface of the array is remarkably improved, and the integrally braided forming of the flexible braided outer layer is easy to realize.

The invention discloses an external sheath of an optical fiber hydrophone array, and belongs to the technical field of submarine communication. The array comprises a main body woven by 316L stainless steel wires, and the main body wraps the outermost layer of the array. The diameter of the stainless steel wire is 0.1 mm-0. 3mm, the deviation is smaller than or equal to + / -0.01 mm, the nickel content is larger than or equal to 10%, the chromium content is larger than or equal to 16%, an oxidation film of 5 microns to 10 microns is formed on the surface through passivation treatment, and the salt spray corrosion resistance is larger than or equal to The woven layer adopts special-shaped and / or variable-diameter weaving, the density of the wear-resistant section is 120-140 / 10cm, the density of the light-weight section is 80-100 / 10cm, and a 0.1-0.2 mm hydrogenated nitrile rubber buffer layer is arranged on the inner side of the wear-resistant section. Compared with a traditional structure, the weight is reduced by 60%-70%, the wear resistance is improved by 50%-70%, the weight change rate is smaller than or equal to 0.1% after the cable is soaked in seawater for 30 days, the cost is reduced by 20%-30%, and the cable is suitable for multi-scene underwater detection.

The invention provides a complex reflection environment sound field separation method based on a double-layer hydrophone array, and the method comprises the steps: constructing a double-layer envelope surface sound pressure measurement array in a ship pool, and building a ship radiation and pool wall reflection sound field model; establishing a sound field analysis model for inward and outward radiation of a semi-free space cylindrical surface, and constructing a semi-space double-cylindrical surface sound pressure-sound pressure transfer matrix; according to the amplitude and phase of double envelope surface measurement sound pressure, ship pool ship radiation and reflection sound are separated, and a mapping relation between a measurement surface and an equivalent source is established in combination with a half-space Green function, so that accurate separation and reconstruction of a sound field are realized.

The invention discloses a dynamic measurement system and method for the in-situ sound insulation performance of a ship sound baffle, and belongs to the technical field of ship sound baffle sound insulation performance measurement. The dynamic measurement system for the in-situ sound insulation performance of the ship sound baffle comprises an acquisition module which comprises a first hydrophone array and a second hydrophone array, the first hydrophone array is used for acquiring a time-domain sound pressure signal of a sound facing surface of the sound baffle, and the second hydrophone array is used for acquiring a time-domain sound pressure signal of a sound backing surface of the sound baffle; the data storage module is used for receiving and storing the time domain sound pressure signals, output by the acquisition module, of the sound facing surface and the sound backing surface of the sound baffle; and the data analysis module is used for calculating sound pressure levels of the sound-facing surface and the sound-backing surface according to the time domain sound pressure signals of the sound-facing surface and the sound-backing surface of the sound baffle, and obtaining a noise reduction effect of the sound baffle according to the sound pressure levels of the sound-facing surface and the sound-backing surface.