115 results about "Acoustic response" patented technology

The invention relates to the technical field of concrete bubble monitoring, in particular to an aluminum film system concrete bubble dynamic monitoring and regulating method which comprises the following steps: applying a high-frequency alternating current with a first preset parameter to an aluminum film system to induce eddy current in an aluminum film and enable the aluminum film to generate thermally induced acoustic vibration; meanwhile, an eddy current thermally induced acoustic response signal reflected by an internal interface of the concrete is obtained; based on the response signal, determining current bubble state information in the concrete, including amplitude attenuation characteristics based on the sound pressure signal, frequency spectrum characteristics based on the sound pressure signal and phase delay information; and based on the bubble state information, a regulation and control instruction of a second preset parameter is generated, the regulation and control instruction is executed to adjust the parameter of the high-frequency alternating current applied to the aluminum film system, and directional traction regulation and control are conducted on the bubbles in the concrete. According to the invention, by means of an eddy current thermally induced sound technology, dynamic distribution, including the number, the particle size, the motion trail and the like, of bubbles is captured in real time, and instantaneous changes in the pouring process can be accurately reflected.

The invention belongs to the technical field of rolling bearing manufacturing, and discloses a preparation method of a high-precision robot turntable bearing, which comprises the following steps: applying a static load simulating a preset working load to a bearing ring workpiece subjected to heat treatment, and executing a set of closed-loop acoustic vibration treatment on the workpiece in a state of keeping the static load, the processing can dynamically track the resonant frequency of the workpiece to update excitation, can monitor acoustic response characteristic parameters of the workpiece in real time, and automatically terminates when the time change rate of the parameters meets a stable condition. According to the method, the specific directivity is provided for the stress release process driven by acoustic vibration energy, so that an original disordered residual stress field in a workpiece forms an optimized form capable of actively adapting to future working loads, and the problem that the static geometric precision and the dynamic service precision of a bearing are inconsistent in a traditional process is solved.

The invention relates to the technical field of automatic control of drilling parameters, in particular to a coal bed gas underground drilling construction parameter optimization method and system.The method comprises the following steps that sound wave response signals are obtained, propagation characteristics are calculated, bit pressure data are aligned, abnormal fluctuation is recognized, pumping pressure information is extracted, and the change trend is analyzed; and comparing the consistency of the regulation and control points and organizing regulation and control actions to finally form a coal-bed gas well drilling parameter optimization control flow. According to the method, accurate calibration of an abnormal state is achieved by constructing a sound wave propagation delay sequence and synchronizing bit pressure response, key regulation and control fragments are recognized in combination with a pumping pressure change trend, a time sequence coupling relation between bit pressure and pumping pressure is established, regulation and control action combinations meeting response consistency are extracted, and sequential organization is conducted; a control instruction set with continuity and pertinence is formed, collaborative recognition and linkage regulation and control of multi-parameter change trends are achieved, and stability and response coordination in the construction process are improved.

The invention relates to the technical field of semiconductor packaging, and discloses a bonding wire welding method based on bare chip interconnection, and the method comprises the steps: collecting and fusing acoustic response and optical reflection signals of a bonding interface in real time through a multi-mode in-situ sensing mechanism integrating acoustic resonance and surface plasmon resonance; dynamically calculating the thickness, the mechanical coupling deformation and the energy dissipation state of the intermetallic compound layer; and the ultrasonic power and the bonding force are subjected to closed-loop adjustment in combination with a model prediction control algorithm, so that the welding process is evolved along a preset optimal physical path all the time. The system comprises a multi-mode sensing welding head, a synchronous data acquisition module, a state resolving module and a self-adaptive control module. The transparent and intelligent welding process is realized, and the bonding consistency, reliability and yield of high-density interconnection are remarkably improved.

The present invention discloses a bionic regulation method for a number of bounces of a droplet on a metal surface based on acoustic in-situ monitoring, which comprises the following steps: obtaining dynamic contact characteristics and acoustic properties of a solid-liquid interface of metal superhydrophobic surfaces with different surface information in the droplet bounce process based on an optical-acoustic synchronous in-situ testing system for droplet bounces; and obtaining a correlation among the metal superhydrophobic surface, the acoustic response and the droplet bounce behavior based on the dynamic contact characteristics and the acoustic properties of the solid-liquid interface, and machining and modifying a micro-nano structure of the metal surface by combining a coupled bionic concept according to the correlation. A scientific basis and a novel design method are provided for the bionic regulation of the number of droplet bounces over the metal surface.

The invention provides a building damage early-stage detection method and system based on multi-field coupling and related equipment, and relates to the technical field of house safety monitoring. Respectively acquiring excitation acoustic response, selected wave band spectral reflection and transient heat conduction response signals of the target building facade; performing time-frequency domain transformation processing on the signal to obtain a multi-physical field feature vector; obtaining target building facade material attribute parameters and environmental action historical data, and constructing a degradation evolution knowledge graph according to the attribute parameters and the environmental action historical data; performing similarity matching on the multi-physical field feature vector and each degradation mode feature template, and judging whether a potential degradation mode exists or not; if yes, time sequence correlation analysis is carried out on the potential degradation mode, physical field characteristic evolution trends in continuous M collection periods are determined, and a degradation development rate index is determined accordingly; and when the index is greater than a preset rate threshold, generating degradation early warning information.

The invention discloses a solid-state battery bidirectional DCDC multi-target optimization control system integrated with a BMS, and belongs to the technical field of battery management systems, and the system comprises an acoustic library building module which is used for applying current pulses of different amplitudes and rates, and collecting a high-frequency broadband sound wave response spectrum; analyzing the propagation speed, attenuation characteristics and frequency spectrum change of sound waves in the multilayer structure, and establishing an acoustic characteristic base library; the risk identification module is used for applying a micro-current detection pulse in a predetermined mode and capturing a transient acoustic response; accurate sensing of the microscopic physical state of the solid-state battery under the dynamic load working condition can be achieved, high-power charging and discharging and working condition abrupt change scenes can be rapidly adapted, the power response timeliness and the control precision are improved, meanwhile, global optimal balance of efficiency, service life and power stability is achieved, uneven deposition of lithium ions is restrained, and the service life of the solid-state battery is prolonged. Interface impedance and failure risks are reduced, and safe and reliable operation of the system is guaranteed.

The invention discloses a multi-mode hearing function analysis system for prognosis evaluation of sudden deafness, which relates to the technical field of auditory rehabilitation engineering, and comprises an echo modeling module, a pseudo peak tracking module, a resonance correction module, a beat reconstruction module and a steady-state peak elimination module, and establishing a time-frequency phase-locked observation baseline, calibrating a complete echo path difference between the ear canal and the transducer, and generating echo topology priori. Echo topology reference is constructed, false peak tracking, resonance elimination and beat reconstruction mechanisms are combined, high-frequency false peak interference is accurately recognized and weakened, acoustic response authenticity is improved, auditory assessment precision is improved through a closed-loop regulation strategy, and sudden deafness prognosis judgment and rehabilitation intervention are effectively supported.

This application discloses a method, device, medium, and product for active control of aerodynamic noise in the target area during tiltrotor transition flight, relating to the field of noise control. The method includes: during tilt transition conditions, constructing a target noise control area within a set region based on flight mission and environmental requirements, discretizing it into multiple spatial observation points and assigning weights; parameterizing the controllable aerodynamic loads on the blades to obtain control load variables, establishing the relationship between the control load variables and the acoustic response of the target noise control area, determining unknowns, and establishing a global acoustic optimization objective function; using the DDQN algorithm as a solver, optimizing the global acoustic optimization objective function under the premise of satisfying actuator physical constraints to obtain the optimal control law, performing feedforward execution and feedback correction to achieve active control of aerodynamic noise in the target area. This application can solve the main shortcomings and derived problems caused by focusing on single-point noise control.

The invention discloses an automatic stereoscopic warehouse goods shelf structure configuration method and system, and relates to the technical field of goods shelf distribution, and the method comprises the steps: obtaining the information of heavy goods to be stored, the information of heavy goods to be stored comprising weight information, size information and gravity center distribution characteristics; detecting the alternative goods shelf to obtain goods shelf health state data, the goods shelf health state data including the current actual bearing capacity, the fatigue damage accumulated estimated value and the acoustic response abnormal degree; according to the to-be-stored heavy goods information and the goods shelf health state data, calculating a comprehensive risk index of the alternative goods shelf; generating a shelf allocation priority list according to the comprehensive risk index; and according to the goods shelf distribution priority list, carrying out position distribution on the heavy goods. The goods shelf distribution priority can be calculated in combination with the goods information and the goods shelf state, so that goods shelf structure configuration is achieved, the goods warehousing efficiency is improved, and the goods shelf maintenance cost is reduced.

The application discloses a valve micro-leakage detection method and device based on acoustic response analysis. The method comprises the following steps: applying an active acoustic excitation signal to a valve in a sealed state; synchronously collecting acoustic wave response signals generated by excitation through multiple acoustic sensors; extracting acoustic characteristic parameters such as amplitude variation, phase variation and spectral energy; comparing with a no-leakage reference sound field model to determine micro-leakage. The leakage source is located by using a beam forming algorithm, and a characteristic vector composed of amplitude variation, phase variation, spectral energy, MFCC and kurtosis is constructed, which is input into a convolutional neural network model to identify leakage causes such as sealing surface wear, sealing pad damage or micro-cracks. The detection system of the application comprises an excitation control module, a collection module, a processing module and a judgment module. The method does not require a water bath, has high sensitivity and is suitable for automatic production detection.

This invention discloses a method and system for predicting compressor casing noise based on an acoustic boundary element model, belonging to the field of noise prediction technology. The method specifically includes: establishing a three-dimensional geometric model of the compressor casing; constructing an acoustic boundary element model of the compressor casing based on the three-dimensional geometric model; discretizing the geometric model into boundary element units; identifying the main noise sources inside and outside the compressor; loading the identified noise sources as boundary conditions into the acoustic boundary element model; setting acoustic boundary conditions according to the actual working environment and material properties of the compressor casing; solving the acoustic boundary element model; calculating the acoustic response of the compressor casing surface; and predicting the noise of the compressor casing based on the calculated acoustic response of the compressor casing surface. This invention takes into account the complex geometry and material properties of the compressor casing, enabling more accurate localization and quantification of noise sources.

The invention provides an acoustic-magnetic dual-mode diagnosis and treatment agent as well as a preparation method and application thereof, and belongs to the technical field of preparation of tumor diagnosis and treatment agents. The acoustic-magnetic dual-mode diagnosis and treatment agent is surface-modified magnetic nanoparticles which contain nano balloon genes and are subjected to Escherichia coli induced expression; the nucleotide sequence of the nano-balloon gene is a sequence shown as NCBI: KC601845.1, escherichia coli in the acoustic-magnetic dual-mode diagnosis and treatment agent as a diagnosis and treatment agent carrier has an active targeting property on a tumor hypoxic region, and bacteria contain a nano-balloon and have an acoustic response characteristic; the escherichia coli surface modified magnetic nanoparticles have a magnetic response characteristic. In acoustic-magnetic dual-mode imaging, firstly, on a real-time ultrasonic contrast monitoring image, a nano air bag expressed in bacteria can generate an enhanced tumor ultrasonic echo signal; secondly, under the action of an external changing magnetic field, the magnetic nanoparticles on the surfaces of the bacteria can generate an enhanced tumor magnetic vibration imaging effect, so that more efficient tumor diagnosis and / or treatment can be realized.

The invention relates to the technical field of carbon fiber reinforced composite materials, and discloses a preparation method of a carbon fiber reinforced composite material for manufacturing a guitar, and the method comprises the following steps: carbon fiber pretreatment, resin matrix preparation, dipping treatment, layering molding and curing molding. According to the preparation method, the carbon fiber fabric or tows are subjected to plasma activation treatment, so that surface inert pollutants are removed, and the interface bonding strength between carbon fibers and a resin matrix is enhanced; the prepared impregnation liquid forms a compact and tough cured body structure after curing by compounding the epoxy resin and the polyurethane resin and combining with the specific functional additive and the acoustic reinforcing agent, so that not only is the efficient transfer of load ensured, but also the overall mechanical property of the composite material is improved, and the service life of the composite material is prolonged. And due to the synergistic effect of the functional additive and the acoustic reinforcing agent, the vibration characteristic of the material is improved, and a material foundation is laid for obtaining excellent acoustic response.

The invention discloses a key control detection method and device for a gamepad and a medium, and relates to the technical field of man-machine interaction, and the method comprises the steps: building a mapping table of a key acoustic reference file and a key region, and carrying out the continuous sampling of the vibration acoustic response of a key surface structure during the operation of a user, generating a key acoustic sampling frame set attached with a unified time identifier; comparing the key acoustic sampling frame set with a key acoustic reference file, identifying a key drop point area, and aggregating to generate a key drop point event set; and analyzing an acoustic response signal corresponding to the key drop point event set, judging a target shearing direction through an energy migration track and a phase change mode of the acoustic response signal, and binding the target shearing direction with the key drop point event set to generate a key control event set. According to the method, the over-complete dictionary associated with the key drop point area identifier is constructed based on the key acoustic reference file, and the consistency and real-time performance of complex control instruction analysis are enhanced.

The invention discloses a video call forgery detection method based on a high-frequency sound signal, and the method comprises the steps: enabling a terminal device to actively transmit a high-frequency sound signal which is imperceptible to human ears in a video call process, and embedding a random sequence code in the high-frequency sound signal; the method comprises the following steps: synchronously acquiring an audio signal and a video signal of a video call, verifying a random sequence carried in the audio, extracting a human body motion feature of a target user reflected by high-frequency sound response, and extracting a corresponding visual motion feature from a video picture; and judging whether the video call is a real-time real call or not by analyzing the time sequence consistency between the acoustic motion feature and the visual motion feature. According to the method, a high-frequency sound active detection mechanism of random sequence coding and cross-modal motion consistency check are utilized, and playback and synthesis class forgery in a video call are defended from the physical level. The system can be deployed in terminal equipment such as a computer, a smart phone and the like with a loudspeaker, a microphone and a camera.

An architectural thermoplastic panel includes double-sided, high-relief embossments formed simultaneously during a controlled heating and pressure process. A first major surface of the panel includes a first high-relief embossment and a second major surface opposite the first major surface includes a second high-relief embossment. The embossments may exhibit cohesive structural interactions through the thickness of the panel, producing complementary or registered features that improve rigidity, distribute stresses, and alter acoustic response. Each embossment can have a depth and substantially similar fidelity and surface finish. The embossments can also redirect light through the panel body, causing visual effects such as prismatic separation, refraction, diffusion, scattering, or gradient banding. In some embodiments, the panel is transparent or translucent, permitting viewing of registered patterns from either side.

Some disclosed methods involve causing one or more loudspeakers in an audio environment to emit sound and receiving microphone signals from one or more microphones in the audio environment corresponding to an acoustic response of the audio environment to the emitted sound. Some disclosed methods involve detecting, by the control system, a change of the acoustic response of the audio environment. Some disclosed methods involve changing one or more aspects of media processing for media played back by one or more devices in the audio environment based, at least in part, on the change of the acoustic response of the audio environment. Alternatively, or additionally, some disclosed methods may involve changing the lighting in the environment, changing a gain of one or more microphone signals, locking or unlocking one or more devices, or combinations thereof, based at least in part on the change of the acoustic response.

The application relates to a robot, and particularly discloses a multi-tool cooperative control method of a deep-sea special operation robot, which comprises a positioning system and a caterpillar walking mechanism assembled on the operation robot. The positioning system is used for the following steps: S01, acquiring marine environment data in real time to form first data transmitted to a shipborne terminal; S02, determining distance data of the shipborne terminal from the operation robot based on an acoustic response mode; S03, acquiring picture data of current operation of the operation robot in real time to form second data transmitted to the shipborne terminal; and S04, acquiring a surrounding environment magnetic field of the operation robot located under a seabed to determine attitude data of the operation robot and transmit the attitude data to the shipborne terminal as third data. Through coordination of the data, the caterpillar walking mechanism, the buoyancy control system of the operation robot and the underwater propulsion system can be self-adaptively cooperated according to the seabed topography.

The invention relates to the technical field of structural acoustic detection, and discloses a power transmission tower bolt fastening state detection and positioning method, device, equipment and medium, and the method comprises the steps: transmitting a frequency-adjustable acoustic shock wave excitation signal to a tower bolt connection region, collecting a generated acoustic response signal, carrying out the filtering and envelope demodulation of the acoustic response signal, and obtaining a frequency-adjustable acoustic shock wave excitation signal; the method comprises the following steps: obtaining an effective voiceprint signal, performing multi-scale decomposition on the effective voiceprint signal to obtain voiceprint decomposition signals of a plurality of scales, extracting voiceprint feature vectors of the voiceprint decomposition signals, matching the voiceprint feature vectors with a preset bolt voiceprint feature atlas library to obtain a loose state of a target bolt, and performing positioning inversion on the effective voiceprint signal to obtain a loose state of the target bolt. And obtaining a candidate positioning area of the target loose bolt, and performing semi-supervised learning screening on the candidate positioning area to obtain a target position of the target loose bolt. According to the invention, high-precision automatic identification and rapid positioning of bolt loosening are realized, and intelligence and efficiency of power transmission tower inspection are improved.

The invention relates to the technical field of digital cultural heritage protection, in particular to an ancient musical instrument digital duplicating method based on an acoustic modeling and 3D printing technology, which comprises the following steps: synchronously executing geometric structure data acquisition and acoustic characteristic data acquisition on an ancient musical instrument body to be duplicated; constructing a parameterized physical acoustic model based on the acoustic characteristic data; preparing a physical entity copy of the ancient musical instrument through an additive manufacturing technology by utilizing the geometric structure data; carrying out acoustic characteristic data acquisition on the physical entity copy to obtain an acoustic response of the physical entity copy; and carrying out comparative analysis on the acoustic response of the copy, the acoustic response of the original musical instrument body and the output of the physical acoustic model, and carrying out iterative optimization. Through a multi-dimensional data collaborative acquisition mechanism and a sound-shape fusion verification and iteration calibration process, high-precision digital reproduction of shape, sound and playing integration is realized, and the problem of shape and acoustic data separation in the background technology is solved.

The application relates to a kind of electric core internal micro short circuit detection method and system, it includes: using different frequency ultrasonic wave to excite electric core, obtains end frequency voltage response factor and characteristic frequency band voltage response factor;Determine criterion value based on the nonlinear relationship of end frequency voltage response factor and characteristic frequency band voltage response factor;Criterion value is compared with preset threshold value;When criterion value is greater than preset threshold value, it is determined that electric core exists micro short circuit, otherwise, it is determined that electric core is normal.The application can obtain the acoustic response characteristics of electric core under different frequencies, the nonlinear relationship criterion value constructed based on end frequency voltage response factor and characteristic frequency band voltage response factor, amplify the subtle acoustic characteristic change caused by micro short circuit, convert the weak acoustic change caused by micro short circuit into numerical difference, so that even very early micro short circuit can be reliably detected, avoid the need to disassemble electric core or apply test conditions that may damage electric core in traditional method, realize nondestructive testing.

The present application belongs to the technical field of audio processing, and particularly relates to an audio reproduction method and system for live sound field data collection and digital signal processing. The method comprises collecting sound field data of a real acoustic space and generating a dedicated sound field parameter model; receiving an original digital audio signal and a user instruction, obtaining a dedicated sound field parameter model corresponding to the user instruction as a target dedicated sound field parameter model; performing convolution processing on the original digital audio signal and the target dedicated sound field parameter model to obtain a processed audio signal with enhanced spatial sense; and outputting the processed audio signal after multi-channel digital amplification, thereby realizing audio reproduction of the acoustic response characteristics of the dedicated sound field. The present application generates a dedicated sound field parameter model based on impulse response data collected in a real acoustic space, and the reproduced reverberation characteristics, spatial sense and sound image positioning are highly consistent with the target space, and the sound field restoration accuracy is significantly improved.

This invention relates to the fields of artificial intelligence and computer image recognition technology, and discloses an intelligent method and system for detecting the quality of interior decoration. The method includes: applying a composite acoustic signal through a multi-band acoustic excitation device, and simultaneously acquiring multi-channel acoustic response, infrared thermal imaging sequences, and electromagnetic induction data; extracting acoustic impedance abrupt changes, thermal conduction anomalies, and electromagnetic continuity features respectively; generating multimodal embedding vectors using three convolutional neural network encoders, and generating a unified representation through a cross-modal attention fusion module; finally decoding and outputting defect type, confidence level, and three-dimensional positioning information, and superimposing it onto a building information model to generate a visual report. This system integrates a multi-physics sensing unit and an edge computing module to achieve non-invasive, fully automatic, and high-precision interior decoration quality detection. This invention improves defect detection rate and positioning accuracy through multimodal fusion and deep learning, increasing detection efficiency compared to manual methods.

The invention relates to the technical field of heat supply pipe network monitoring, and discloses a system and a method for detecting leakage points of a heat supply well chamber based on multivariate sound acquisition and intelligent analysis. The system collects data through an acoustic sensor, an active acoustic excitation source and a working condition sensor which are arranged in a thermal well chamber. The method comprises the following steps: acquiring a current working condition parameter vector of a pipe network in real time, and generating a current acoustic response feature vector; according to the current working condition parameter vector and a dynamic health acoustic fingerprint database, determining a dynamic baseline acoustic response feature vector; and an acoustic response residual vector is obtained by calculating the difference between the current vector and the dynamic baseline vector, and a leakage point is judged and positioned according to the acoustic response residual vector. And after the leakage point is repaired, the system can update the fingerprint database by using newly collected data. According to the method, the dynamic acoustic base line matched with the real-time working condition is constructed for residual analysis, working condition fluctuation and background noise interference are effectively eliminated, early-stage tiny leakage points can be accurately detected, and the false alarm rate is reduced.

The application belongs to the field of rock physics and geophysical exploration, and relates to a simulation method for wettability affecting dispersion and attenuation of partially saturated sandstone, which comprises the following steps: S1. establishing a relationship between capillary pressure and water saturation for wettability correction; S2. calculating equivalent pore throat radius and effective permeability according to the relationship between capillary pressure and water saturation; S3. calculating characteristic frequency and complex bulk modulus under different wettability conditions based on a partially saturated patchy medium model; S4. simulating and comparing the characteristics of longitudinal wave velocity and attenuation under different wettability and water saturation conditions, analyzing the modulation law of frequency-dependent acoustic response caused by wettability change, and realizing quantitative characterization of the wettability effect. The step-by-step modeling method proposed in the application, combined with the wettability correction parameter represented by the contact angle, can systematically calculate the continuous coupling process from capillary pressure to equivalent pore throat structure and equivalent permeability to acoustic response, and realize quantitative analysis of the wettability change on the dispersion and attenuation law.

This invention discloses a method for detecting and analyzing vibration and noise in miniature bearings, relating to the field of noise detection technology. The invention constructs a detection position consistent with the target assembly scenario and collects vibration and acoustic response data under conditions such as gradually changing speed, pulsating speed, axial preload, directional off-center loading, and start-stop transition. It further calculates disturbance-sensitive trajectory data, energy redistribution trajectory data, and repetitive visible trajectory data, thereby enabling the differentiation and analysis of raceway anomalies, cage anomalies, lubrication anomalies, and assembly eccentricity anomalies. Compared to existing technologies, this invention can more realistically reflect the abnormal noise performance of miniature bearings after installation, improve the early identification capability of weak anomalies and the accuracy of anomaly source analysis, and can output conclusions regarding the risk of abnormal noise during installation.

The invention relates to the technical field of material analysis and detection, and discloses a laser ultrasonic detection device for a crack prefabricated sample of a fatigue testing machine, which comprises a crack prefabrication control module, a laser ultrasonic detection module, a feature fusion reconstruction module and a modeling and visual output module, according to the method, femtosecond laser-liquid nitrogen collaborative cutting, quantum dot acoustic calibration, laser ultrasonic detection and deep learning reconstruction methods are systematically integrated, so that the technical problems of high probability of thermal damage, uncontrollable initial crack and high discreteness of a detection result in the machining process of a traditional crack prefabricated sample are solved; non-contact and nondestructive detection is achieved, multi-dimensional information such as crack space distribution, acoustic response change and expansion trend is synchronously output, and the detection result can be directly used for crack prefabrication quality evaluation of a fatigue testing machine and optimization and adjustment of material process parameters. The whole scheme is high in detection precision, good in repeatability, high in automation degree and suitable for fatigue test crack prefabrication and detection scenes with high consistency and high reliability.

The invention relates to the technical field of fluid acoustic experiments, in particular to a shaft flow disturbance experimental device and experimental method for a distributed acoustic sensing experiment. The experimental device comprises a liquid supply module, a steady flow regulation and control module, a shaft flow disturbance module, a DAS monitoring module and a recovery module. Wherein the liquid supply module is used for providing a fluid source; the steady flow regulation and control module is used for reducing the influence of pressure and flow fluctuation on an acoustic background in a shaft in a liquid supply process, and constructing an experimental flow environment with a controllable acoustic background; the shaft flow disturbance module comprises a shaft and at least one disturbance body, and is used for constructing position-known, stable and repeatable acoustic excitation conditions under the condition that structural parameters are controllable; the DAS monitoring module is used for collecting acoustic response signals generated by fluid flowing in the shaft pipe section; the recovery module is used for fluid recovery treatment; the device can be used for carrying out acoustic response experiments under different disturbance structures and different flow working conditions.

A testing unit for the non-destructive testing of an electrically conductive and / or ferromagnetic workpiece comprises at least one magnetizing coil (1) and at least one RF coil (2), wherein the magnetizing coil (1) is configured to generate a static or quasi-static magnetic field. The RF coil, acting as a transmitting coil (4), is configured to generate an alternating magnetic field oriented perpendicular to the static or quasi-static magnetic field, wherein the RF coil (2) and the magnetizing coil (1) can be arranged one above the other in a direction perpendicular to the surface of the workpiece.This allows an acoustic transmission signal to be generated by superimposing the signals of the transmitting coil (4) and the signals of the magnetizing coil (1) and to be introduced into the workpiece in a measuring position (3), wherein the RF coil (2) is designed as a receiving coil (5) to receive an acoustic response signal in the measuring position (3).